Journal articles: 'Active power filter (APF)'

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Zhou, Xue Song, Da Yan Wang, and You Jie Ma. "An Overview of Active Power Filter." Applied Mechanics and Materials 552 (June 2014): 111–14. http://dx.doi.org/10.4028/www.scientific.net/amm.552.111.

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APF has its outstanding features comparing with PPF, it is a new type harmonic suppression and reactive power compensation device. This paper makes an introduction about two key technologies about APF, and it makes a prediction to the trend of the key technologies. APF is the main harmonic suppression technique at present and in the future. At present, there are large of loads in every industry, such as, electric arc furnace in steel industry, the welder in automotive industry, and these industries are important sectors of the national economy, we can do not stop them running, only installing APF in the appropriate location .Therefore, APF has broad prospects for development in various industries.

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Ma, You Jie, Jian Zhao, and Xue Song Zhou. "Control Methods of Active Power Filter." Advanced Materials Research 317-319 (August 2011): 2342–45. http://dx.doi.org/10.4028/www.scientific.net/amr.317-319.2342.

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Active power filter (APF) is an important device to compensate harmonic and reactive current in power system control method adopted has a great influence on its performance. The paper introduces several control methods used by APF, including the deadbeat control, single-cycle control, space vector control and so on. After comparing and analyzing their individual advantages and disadvantages, some improvements for APF performance are proposed.

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Zhou, Xue Song, Wei Liu, and You Jie Ma. "The Review of of Active Power Filter." Advanced Materials Research 940 (June 2014): 339–42. http://dx.doi.org/10.4028/www.scientific.net/amr.940.339.

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Harmonics of power system seriously affected the quality of electric power. Active Power Filter (APF) [ which overcomes the shortcomings of passive filter (PF) has become main technology to suppress harmonic. In this paper, development history, key technology, problems and trends of APF are mainly analyzed and reviewed. With development of key technology of APF, it will have a better application prospect.

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Xie, Xi Feng, and Li Ling Zheng. "Design of Single-Phase Active Power Filter." Applied Mechanics and Materials 329 (June 2013): 421–25. http://dx.doi.org/10.4028/www.scientific.net/amm.329.421.

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Aiming at the features of complexity, poor real-time and Low-accuracy of single-phase Active Power Filter (APF), and the problem of impossible parallel computation in the traditional DSP software realization, new design method of APF Based on FPGA is proposed, This paper focuses on the study of the harmonic current detecting method and improves control method of compensate current, it builds an experimental platform with FPGA EP1C12Q240C8 as the controller, the experimental results all support the effectiveness and correctness of the control methods and design methods of APF.

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Cao, Xudong, Shaozhe Zhou, Jingze Li, and Shaohua Zhang. "A DC Voltage Control Strategy for Active Power Filter." Open Electrical & Electronic Engineering Journal 10, no. 1 (December 30, 2016): 166–80. http://dx.doi.org/10.2174/1874129001610010166.

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Active Power Filter (APF) is capable of changing the size and frequency of harmonics as well as changes in reactive power compensation. It is important to control the stability of the DC-link capacitor voltage stability for it. For DC voltage controls of APF, there are two important achievements. First, it is indicated that the control of DC voltage directly affects the compensation performance of APF. Second, the value of DC voltage influences the power loss of APF. This paper firstly introduces the design of the DC voltage controller. Then the relationship between DC voltage and the power loss as well as the compensation performance of APF is analyzed. Finally, a new control scheme with a droop controller is developed to regulate DC voltage.

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Huang, Jiao Ying, Cheng Gao, Hai Wen Yuan, and Hang Zou. "Design and Implementation of an Active Power Filter." Applied Mechanics and Materials 44-47 (December 2010): 1397–401. http://dx.doi.org/10.4028/www.scientific.net/amm.44-47.1397.

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In order to compensate current harmonic in oil drilling power system, the design, development and experimental investigations of an APF were considered. Based on Fourier transform, a direct harmonic analysis algorithm was designed to identify and track harmonics. Compared with traditional FFT, the proposed algorithm was less dependent on hardware and could be used to for selective harmonic compensation. The laboratory prototype of the APF system was designed and implemented, which was tested in different operating conditions with nonlinear loads to demonstrate its effectiveness and capabilities for harmonic elimination. All experimental results are given and discussed in detail, which validate the proposed APF.

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Li, Tao, and Yong Qiang Liu. "Delay Dependent Stability Analysis of Active Power Filter." Applied Mechanics and Materials 220-223 (November 2012): 1592–97. http://dx.doi.org/10.4028/www.scientific.net/amm.220-223.1592.

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The active power filter (APF) is a dynamic harmonic filtering equipment. The time delay is unavoidable and it has a great negative influence on the stability of the APF system. Based on the introduction of its topology and control strategy, the mathematical model of APF with time delay is built. And the model is a time delay systems with bounded nonlinearity, so a new delay dependent stability criteria is derived and formulated in the form of linear matrix inequality (LMI). The maximum allowed time delay is solved, and the relationships between it and some other parameters are investigated and simulated. The result can be as a reference in the future work.

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ZHOU, LIDAN, MUHAMMAD MANSOOR KHAN, FEIFENG JI, GANG YAO, DA XIE, CHEN CHEN, and JOAN SHU. "ON USING LINEAR PERIODICALLY RESETTING FILTER IN CURRENT CONTROL LOOP FOR ACTIVE POWER FILTER." Journal of Circuits, Systems and Computers 15, no. 04 (August 2006): 615–39. http://dx.doi.org/10.1142/s0218126606003192.

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Among linear control techniques, deadbeat control has been widely accepted as a feasible current control technique as far as the digital signal processor (DSP) implementation of active power filter (APF) is concerned. This control technique uses high gain on the error measured at one sample, to control the error ideally to zero by the next sample. The high gain makes the control very sensitive to any error or noise in the measurements, which is always there in electrical systems. Especially, the periodic noise in parallel implementation of an inverter or APF demands a higher order filter at the current transducer output, which affects the dynamic response of the system. Recently, few papers have reported the results about the use of linear periodically resetting integrators (LPRI) as filter in some electronic applications. This paper is an attempt to generalize the idea of LPRI and here we introduce the notion of linear periodically resetting filter (LPRF). The frequency characteristics of an LPRF are analyzed. Possible application of these filters in current control is studied. It is shown that these filters can be adopted to improve the performances of a current loop in APF.

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Osman, Dygku Aniqnatasa Awg, Rahimi Baharom, Dalina Johari, Muhamad Nabil Hidayat, and Khairul Safuan Muhammad. "Development of active power filter using rectifier boost technique." International Journal of Power Electronics and Drive Systems (IJPEDS) 10, no. 3 (September 1, 2019): 1446. http://dx.doi.org/10.11591/ijpeds.v10.i3.pp1446-1453.

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<span>The development of active power filter (APF) using rectifier boost technique has been identified to compensate for the pulsating nature of the distorted supply current waveform of non-linear load. In this work, investigation is carried out on the operation of rectifier without any filters function. This is then extended to operate the rectifier converter with an active power filter function. APF function is implemented by enabling the closed-loop control using standard proportional integral control to rectify the distorted supply current to become continuous, sinusoidal and in-phase with the supply voltage waveform. Consequently, the total harmonic distortion (THD) level was reduced to meet the acceptable limit defined in the standard of IEEE-519 1992. The selected simulation results obtained from MATLAB/Simulink are presented to justify the proposed filter structure.</span>

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Zhang, Yong Feng, Xin Gong Cheng, Xi Ju Zong, Qing Qing Miu, Xiao Hong Chen, Yan Liang Wang, and Gang Chen. "The Switched Control of Single Phase Active Power Filter." Advanced Materials Research 383-390 (November 2011): 7515–20. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.7515.

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This paper proposes a novel control approach for single phase active power filter (APF) based on switched system theory, since the switching performance of APF. The switched model of APF is established by means of switching function. On this basis, the switched system error model is obtained. After that, a quadratic Lyapunov function is design to determine the switched control law. The switched control can make the switched system asymptotically stable and compensate the distorted current caused by the nonlinear load current. The effectiveness and rationality of the proposed approach is confirmed by the simulation result compared with the linear voltage control approach.

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Yun, Wei Jun, Gang Yao, Li Dan Zhou, Chen Chen, and Jun Min Pan. "Power Quality Enhancement Using a Novel Hybrid Active Power Filter Device Under Nonlinear Loads." Advanced Materials Research 516-517 (May 2012): 1419–24. http://dx.doi.org/10.4028/www.scientific.net/amr.516-517.1419.

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Nonlinear loads generate a large amount of characteristic harmonics , deteriorate the power quality of power distribution systems in Advanced manufacturing enterprises. In this paper a novel hybrid active power filter is proposed which consists of a series thyristor switched filter (TSF) and small rated shunt active power filter(APF). TSF is tuned at fifth and seventh order harmonic frequencies. Consequently APF compensates for third and other order harmonics, unbalance current and reactive power. A new control method based on PHC strategy is presented for APF. The device has already got an application in one of the transformer substations of a automobile factory. It’s revealed that the proposed device can improve the power factor , reduce the harmonics injection and enhancement power quality of the power distribution systems.

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Wang, Hai Yang. "Summary of Research Status of Active Power Filter." Applied Mechanics and Materials 721 (December 2014): 587–90. http://dx.doi.org/10.4028/www.scientific.net/amm.721.587.

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Due to the rapid development of modern rapid power electronics, power system harmonics are also increasingly serious harm, in order to effectively suppress harmonics to improve power quality, active power filter APF came into being, it can be effective for reactive power and frequency, amplitude harmonic changes are real-time tracking compensation. Currently, APF power electronics technology has become a major research topic. This article describes the basic working principle of harmonic current detection method and compensation current control method, the main circuit type of active power filter.

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Shen, Hong, Fan Yang, Ahmed Abu-Siada, and Zhao Liu. "A New Control Strategy for Active Power Filter." Energies 12, no. 21 (October 27, 2019): 4099. http://dx.doi.org/10.3390/en12214099.

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The significant increase in electronic devices has resulted in serious harmonic pollutions in electricity grids. In addition, due to the resonance of the system capacitance and inductance, the harmonic current may be amplified dramatically when it goes through the transmission line which is harmful to the normal operation of electrical equipment. To suppress the voltage and current harmonics resonance, many control strategies of active power filter (APF) are proposed. Nevertheless, these strategies cannot attenuate the amplified harmonic voltage and current due to resonance. In this paper, the harmonic propagation characteristics are investigated on a long transmission line and a new control strategy called VI-APF based on current-controlled and voltage-controlled current sources connected in parallel is presented. According to the simulation results, the proposed control strategy can suppress the total harmonic distortion to a low level. Finally, the effectiveness of VI-APF is demonstrated through the simulation on the IEEE 33-bus distribution system.

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Wang, Yan, and Ruijie Yang. "Design of Parallel Hybrid Active Power Filter." Journal of Physics: Conference Series 2290, no. 1 (June 1, 2022): 012044. http://dx.doi.org/10.1088/1742-6596/2290/1/012044.

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Abstract With the rapid development of social economy, electric energy plays an indispensable role in social life and has become an important symbol of the country’s comprehensive national strength. However, with the rapid development of power electronic technology, many nonlinear loads appear in the power system, which has become the most important harmonic source in the power system. Harmonics will not only affect the normal operation of various electrical equipment, but also damage the peripheral communication system and equipment of public power grid. Therefore, we must control the harmonics in the power grid. The traditional treatment scheme is to use LC passive filter (PF), but it can only filter out harmonics of a specific number of times. In addition,it is sensitive to power grid parameters, may produce resonance, so that the harmonics are amplified, and the volume of the filter device is huge. In order to overcome the above problems, active power filter (APF) appears, which can dynamically compensate harmonics according to harmonic frequency and size, and has excellent flexibility and practicability. However, in terms of cost, the cost of APF with the same capacity is much higher than that of PF. Therefore, based on the respective characteristics of PF and APF, this paper makes an in-depth research and design of hybrid active power filter (HAPF). In this system, the passive filter completes the main harmonic compensation and reactive power improvement, while the active filter is used to help the passive filter overcome the disadvantage of easy resonance.

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Jin, Yun Ce, and Li Chen Zhang. "Design of Main Circuit and Analysis of Active Power Filter." Applied Mechanics and Materials 150 (January 2012): 160–64. http://dx.doi.org/10.4028/www.scientific.net/amm.150.160.

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With the use of power electronic equipments and increasing nonlinear loads, the problems of quality of power supply becomes serious. Different kinds of loads need different active power filter (APF). Performance of APF depends on the design of main circuit. In this paper, the principle of APF and many kinds of structure of main circuit are presented. Multilevel, injection circuit and multiplicity are analyzed. A combined controller, the combination of PI controller and fuzzy controller, is applied to voltage control of DC side.

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Faiza, Aouiouat A., Sebaa Morsli, and Allaoui Tayeb. "Self Tuning Filter Based Fuzzy Logic Controller for Active Power Filter." Journal Européen des Systèmes Automatisés 53, no. 5 (November 15, 2020): 739–45. http://dx.doi.org/10.18280/jesa.530517.

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The performance of the Active Power Filter (APF) depends on the identification strategy of the reference currents and their control. Among the control strategies proposed in the literature to identifying the reference currents, that based on Self Tuning Filter (STF) which allows extracting directly the voltage and current fundamental components in the α-β axis at high performances, without any Phase Locked Loop (PLL). The performance of STF is function of its proportional parameter. However, there is no technique existed in the literature to dimensioning the proportional parameter of the STF filter. This paper presents an improved method for identifying the reference harmonic currents to be generated by the APF, based on STF for the extraction of harmonic currents and equipped with a Fuzzy Logic Corrector (FLC) in order to improve the waveform of the electric lines currents. The FLC adjust in real time the proportional parameter of the STF filter. The proposed FLC-STF regulator allows to having an optimal extraction of the harmonic currents. The conventional hysteresis method was used for the current control technique to generate the switching sequences of the static switches of the APF voltage inverter. The obtained simulation results, performed under the MATLAB/Simulink® environment on a system feeding a non-linear load, show good performance.

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Zhang, Chen Yu, Jian Yong Zheng, and Jun Mei. "Research on LCR Filter in the Link of Shunt Active Power Filter in Electrical Power System." Advanced Materials Research 676 (March 2013): 273–76. http://dx.doi.org/10.4028/www.scientific.net/amr.676.273.

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Shunt active power filter (APF) is an electric equipment which effectively optimizes harmonic waves. By measuring the load current, it produces compensated current with opposite amplitude to the load current in order to improve the power quality of the power grid. Little has been reported on how to effectively design the LPF employed in the link of shunt APF and power system. The paper theoretically analyzes constrains for parameters of the LCR output filter, and then determines the optimal LRC filter parameters by comparing different output filter (OF) functions. At last, the experiment results further verify the correctness of the design method.

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Mohamad, Syahrul Hisham, Mohd Amran Mohd Radzi, Nashiren Farzilah Mailah, Noor Izzri Abd. Wahab, Auzani Jidin, and Musa Yusup Lada. "Adaptive notch filter under indirect and direct current controls for active power filter." Bulletin of Electrical Engineering and Informatics 9, no. 5 (October 1, 2020): 1794–802. http://dx.doi.org/10.11591/eei.v9i5.2165.

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This study presents the implementation of adaptive notch filter (ANF) as reference signal extraction for shunt active power filter (APF) in indirect current control (ICC) and direct current control (DCC) modes for three phase system. The ANF functions to filter the signal that inputted to it by producing a fundamental signal and harmonics signal. The advantage of applying the ANF algorithm is based on its simple design that giving the ANF advantages to be utilize in microcontroller. The performance of the ANF is validated though MATLAB simulation in ICC dan DCC configurations. Based on the simulation results, the ANF is capable to work efficiently for both ICC and DCC modes, but in term of efficiency, the ICC mode is clearly showing a better harmonics mitigation result. Base on the result also it shown that the ANF is capable of mitigate the harmonics below the standard required by the IEEE 519-92. The application of ANF is useful to be applied due to its simple design and filtering method.

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Fei, Juntao, Shenglei Zhang, and Jian Zhou. "Adaptive Sliding Mode Control of Single-Phase Shunt Active Power Filter." Mathematical Problems in Engineering 2012 (2012): 1–22. http://dx.doi.org/10.1155/2012/809187.

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This paper presents a thorough study of the adaptive sliding mode technique with application to single-phase shunt active power filter (APF). Based on the basic principle of single-phase shunt APF, the approximate dynamic model is derived. A model reference adaptive sliding mode control algorithm is proposed to implement the harmonic compensation for the single-phase shunt APF. This method will use the tracking error of harmonic and APF current as the control input and adopt the tracking error of reference model and APF output as the control objects of adaptive sliding mode. In the reference current track loop, a novel adaptive sliding mode controller is implemented to tracking the reference currents, thus improving harmonic treating performance. Simulation results demonstrate the satisfactory control performance and rapid compensation ability of the proposed control approach under different conditions of the nonlinear load current distortion and the mutation load, respectively.

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Peng, Jin Jie, and Xiao Ping Fan. "Control Strategy for Fault-Tolerant Paralleling Active Power Filter." Advanced Materials Research 655-657 (January 2013): 1566–70. http://dx.doi.org/10.4028/www.scientific.net/amr.655-657.1566.

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A control strategy for a fault-tolerant paralleling active power filter was proposed. The structure and running models of the fault-tolerant paralleling active power filter were given. When the inverter of APF had fault in some phase, the fault structure of the inverter was analyzed. Its fault-tolerant structure was three-phase four-switch. The bridge composed of two capacitors replaced the fault phase for the inverter based on three-phase four-switch. It was important to stay stable for inverter DC-side. The method to stabilize the DC-side voltage was proposed. The controlling strategy for APF working on both normal state and fault state was proposed. The simulating results showed that harmonic currents were suppressed by the fault-tolerant paralleling APF whether working on normal state or fault state. The DC-side voltage stayed stable and the system has high reliability.

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Chen, Si Ming, and Xiao Ning Liu. "Design of Phase Synchronization Unit for Active Power Filter in Superconducting Magnet Power Supply." Applied Mechanics and Materials 615 (August 2014): 18–21. http://dx.doi.org/10.4028/www.scientific.net/amm.615.18.

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In this dissertation, a method is given to solve the problem of phase synchronization for active power filter (APF) which is used in superconducting magnet power supply (SMPS). Firstly, the characteristics of the SMPS are introduced and the technical difficulties which will influence the phase synchronization are pointed out. Secondly, in order to solve these difficulties, the synchronization design is based on zero-cross detection, Butterworth filter and phase compensation for practical purposes. Because the APF adopts DSP as the digital controller, the phase compensation can be easily achieved by software design. In the end, the experimental results of a prototype have verified the effectiveness of the proposed design and the APF can trace the frequency and phase of primary input voltage effectively.

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Sangsun Kim and P. N. Enjeti. "A new hybrid active power filter (APF) topology." IEEE Transactions on Power Electronics 17, no. 1 (January 2002): 48–54. http://dx.doi.org/10.1109/63.988669.

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Liu, Dong, Baojin Li, Songtao Huang, Linguo Liu, Haozhe Wang, and Yukai Huang. "An Improved Frequency-Adaptive Virtual Variable Sampling-Based Repetitive Control for an Active Power Filter." Energies 15, no. 19 (October 1, 2022): 7227. http://dx.doi.org/10.3390/en15197227.

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To eliminate the harmonics caused by nonlinear loads, repetitive controllers are widely applied as current controllers for active power filters (APF). In practice, a variation in grid frequency leads to the appearance of a fractional-order delay filter. As a result, the resonant frequency of the repetitive controller will deviate from the fundamental frequency and the controller cannot compensate for harmonics accurately. To solve this problem, an improved frequency-adaptive repetitive controller based on virtual variable sampling (IMFA-VVS-RC) for APF is proposed in this paper. To enhance the system stability margin, the proposed RC introduces an infinite impulse response (IIR) low-pass filter. The proposed RC has a high stability margin at high frequencies due to the low gain of the IIR low-pass filter in the region above the cutoff frequency. In this way, the influence of model uncertainty and parameter uncertainty on system stability are reduced at high frequencies. At the same time, compared with the conventional repetitive controller (CRC), the proposed RC for APF has a better harmonic suppression ability when the frequency varies. Experiments have verified the effectiveness of the scheme adopted for APF.

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Zou, Wan Feng, and Lei Zhang. "An Active Power Filter Controller Based on Dual-DSPs in Low-Voltage Power System." Applied Mechanics and Materials 291-294 (February 2013): 2302–7. http://dx.doi.org/10.4028/www.scientific.net/amm.291-294.2302.

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To compensate harmonics from nonlinear load, the controller of Active Power Filter (APF) need to detect harmonic and generate compensation current in high speed. APF controller functions are divided into two parts: outside controller part and inside controller part. Inside controller part detect harmonic current and control the IGBT to generate grid harmonics current. Outside controller part detect common power parameters and generate signal of management in main circuit. An experiment circuit of APF Controller is established. Some experiments are presented here.

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Tang, Si Wen, Yin Long Li, Li Wen Luo, and Xi Jun Yang. "Research on DC Grid Power Characteristics and DC Active Power Filtering." Advanced Materials Research 805-806 (September 2013): 1031–34. http://dx.doi.org/10.4028/www.scientific.net/amr.805-806.1031.

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When nonlinear load is powered by DC grid, harmonic currents and distortion power are produced. At first, the concept of the DC active power filter (DC-APF) is presented in this paper after the analysis of instantaneous power and power factor in the DC network. The DC-APF includes the parallel type, the series type and the series-parallel type, etc. The circuit topologies and the working principles of two kinds of DC-APF are proposed and analyzed: (1) the general type, which can compensate harmonic currents and reactive currents; (2) the correction type, which can track the DC voltage. The comprehensive simulation analysis of the double-bridge half-controlled DC-APF by means of MATLAB/SIMULINK and the experiment of the correction type prove the validity and the feasibility of these topologies and operating principles.

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Vitoi, Lais Abrantes, Danilo Brandao, and Elisabetta Tedeschi. "Active Power Filter Pre-Selection Tool to Enhance the Power Quality in Oil and Gas Platforms." Energies 14, no. 4 (February 16, 2021): 1024. http://dx.doi.org/10.3390/en14041024.

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This paper proposes a preliminary design tool for active power filters’ (APFs) solutions to be applied in offshore oil and gas platforms, where power quality indices are typically low, and reactive power compensation and current harmonic mitigation are often desired. The proposed approach considers that APF selection and rating is a trade-off between performance and size, and that both component and system aspects need to be optimized to achieve a well-tailored solution. As size and weight are critical constraints in offshore applications, possible benefits of using Silicon Carbide (SiC) switches for the APF implementation are investigated. Moreover, different compensation strategies are compared, varying the connection point of the APF between two different voltage levels and assigning the APFs different compensation goals. Improvements in power quality indices, as well as APFs rating, number of components, power losses, and filter size, have been considered for both SiC and Silicon-based solutions to identify the best trade-offs suitable for the considered, energy intensive industrial application.

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Wang, Chang Ping, Shuo Zeng, and Jie Liu. "Study of the Active Power Filter for the Electric Vehicle Charging Stake." Applied Mechanics and Materials 615 (August 2014): 48–51. http://dx.doi.org/10.4028/www.scientific.net/amm.615.48.

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The electric vehicle (EV) charging stake is widely used for recharging the electric car batteries. The charging stake generally adopts switching power supply technology. It will cause serious harmonic pollution to power systems and consume lots of reactive power. Therefore, this dissertation focuses on the active power filter (APF) for the EV charging stake. Firstly, the principle of the APF are briefly introduced. Secondly, the main design and the technical difficulties are illustrated in detail. The controller of the APF is based on the DSP and the model is TMS320F2812. At last, this study is simulated in Matlab and a prototype is constructed. The simulation and the experimental results prove that the APF can functions well for the electric vehicle charging stake. It has achieved the national power quality standard.

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Xu, Xiang Zheng, and Bai Chao Chen. "Research on Harmonic Suppression of Electric Railway Based on Hybrid Active Power Filter." Key Engineering Materials 439-440 (June 2010): 994–98. http://dx.doi.org/10.4028/www.scientific.net/kem.439-440.994.

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According to the specific property of traction supply system, a novel hybrid active power filter (HAPF) is designed in this paper. The new HAPF topology is that, after the impedance of fundamental wave is in parallel with the active power filter (APF), it is series connected passive filter. The kinds of structure can reduce the VA rating of the APF greatly. The small rating active power filter is used to improve filtering characteristics of the passive filter and suppress possible resonance between the traction supply system impedance and the passive filter. Through MATLAB simulation, it shows that the control strategy of power quality is apparently effective, and it plays an important role in enhancing the reliability of transformer station and the operating security of electric railway.

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Fei, Juntao, and Shixi Hou. "Adaptive Fuzzy Control with Supervisory Compensator for Three-Phase Active Power Filter." Journal of Applied Mathematics 2012 (2012): 1–13. http://dx.doi.org/10.1155/2012/654937.

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An adaptive fuzzy control system with supervisory controller is proposed to improve dynamic performance of three-phase active power filter (APF). The proposed adaptive fuzzy controller for APF does not build an accurate mathematical model but approximates the nonlinear characteristics of APF using fuzzy approximation. The adaptive law based on the Lyapunov analysis can adaptively adjust the fuzzy rules; therefore the asymptotical stability of the adaptive fuzzy control system can be guaranteed. Simulation results demonstrate that the APF control system has excellent dynamic performance such as small current tracking error, reduced total harmonic distortion (THD) index, strong robustness in the presence of parameters variation, and nonlinear load.

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Mustafa, Mohammed Obaid, and Najimaldin M. Abbas. "Harmonic suppression compensation of photovoltaic generation using cascaded active power filter." Eastern-European Journal of Enterprise Technologies 6, no. 8 (114) (December 24, 2021): 60–68. http://dx.doi.org/10.15587/1729-4061.2021.248276.

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The wide spectrum of electromagnetism that explains current and voltage at specific time and location in a power system is referred to as power quality. Alternative energies are becoming more popular due to concerns about power quality, safety, and the environment, as well as commercial incentives. Moreover, photovoltaic (PV) energy is one of the most well-known renewable resources since it is free to gather, unlimited, and considerably cleaner. Active power filter (APF) is an effective means to dynamically suppress harmonics and solve power quality problems caused by the DC side voltage fluctuation. Therefore, this paper describes a substantial advancement in the harmonic suppression compensation algorithm, as well as the cascaded active power filter. Also, this paper focuses on compensating the error of photovoltaic grid-connected generation based on optimized H-bridge cascaded APF. The details of the working principle and topological structure of the APF used as the compensation device are analyzed. The H-bridge cascaded APF is optimized using the segmented variable step-length conductance increment (SVSLCI) algorithm. The overall cascaded APF control strategy is designed and simulated using MatLab/Simulink environment. By the simulation results comparing the existing traction network power quality control measures, before and after compensation, the effectiveness of the proposed control strategy is verified. The proposed controller strengthens the compensation of specific odd harmonics to improve the system work models and criteria to improve power quality. Moreover, the proposed algorithm showed positive significance for optimizing the quality of photovoltaic grid-connected power, reducing the current harmonic, and improving the equipment utilization of photovoltaic inverters.

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Ma, Chao-Tsung, and Zhen-Huang Gu. "Design and Implementation of a GaN-Based Three-Phase Active Power Filter." Micromachines 11, no. 2 (January 24, 2020): 134. http://dx.doi.org/10.3390/mi11020134.

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Renewable energy (RE)-based power generation systems and modern manufacturing facilities utilize a wide variety of power converters based on high-frequency power electronic devices and complex switching technologies. This has resulted in a noticeable degradation in the power quality (PQ) of power systems. To solve the aforementioned problem, advanced active power filters (APFs) with improved system performance and properly designed switching devices and control algorithms can provide a promising solution because an APF can compensate for voltage sag, harmonic currents, current imbalance, and active and reactive powers individually or simultaneously. This paper demonstrates, for the first time, the detailed design procedure and performance of a digitally controlled 2 kVA three-phase shunt APF system using gallium nitride (GaN) high electron mobility transistors (HEMTs). The designed digital control scheme consists of three type II controllers with a digital signal processor (DSP) as the control core. Using the proposed APF and control algorithms, fast and accurate compensation for harmonics, imbalance, and reactive power is achieved in both simulation and hardware tests, demonstrating the feasibility and effectiveness of the proposed system. Moreover, GaN HEMTs allow the system to achieve up to 97.2% efficiency.

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Wang, Ji Dong, and Mei Cui Qin. "Microgrid Harmonic Suppression Method Based on One Cycle Controlled Active Power Filter." Applied Mechanics and Materials 347-350 (August 2013): 1445–49. http://dx.doi.org/10.4028/www.scientific.net/amm.347-350.1445.

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With widely research and application of microgrid, the effect of the harmonic problems becomes not be ignored. This paper applies one cycle controlled active power filter (APF) to suppress harmonic in microgrid. Compared with traditional methods, one cycle controlled APF omits the harmonic detecting circuit and greatly simplifies the system structure. The one cycle control method in this paper, combining with space vector control, divides the frequency cycle into three control sextants, which simplifies the controller further. This paper builds the model of one cycle controlled APF and microgrid model including wind power system and photovoltaic systems. Then make simulation analysis about microgrid harmonic suppression. Simulation results show that one cycle controlled APF has a good compensation effect in microgrid harmonic suppression.

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Guo, Chen, Cun Bing Gui, and Jian Huang. "A Blend Control Scheme of Active Power Filter Based on Harmonic Voltage." Advanced Materials Research 268-270 (July 2011): 434–39. http://dx.doi.org/10.4028/www.scientific.net/amr.268-270.434.

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This paper proposes a blend control scheme of APF based on harmonic voltage to solve the problem that load current detection APF cannot change the harmonic impedance in distribution system. In addition, based on the relationship between the rated volt-ampere of APF and the load volt-ampere, the conductance value could automatic adjustment. Computer simulation and laboratory system are designed and constructed to verify the validity and effectiveness of the shunt active filter equipped with the blend control. The shunt active filter with blend control not only can compensate the nonlinear load harmonic current but also can help to damp the harmonic voltage in distribution system.

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Ma, You Jie, Min Pan, and Xue Song Zhou. "Overview on Control Methods of Active Power Filter." Advanced Materials Research 749 (August 2013): 610–13. http://dx.doi.org/10.4028/www.scientific.net/amr.749.610.

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With the wide application of power electronic devices, especially the use of non-linear device, a large number of harmonics and reactive current injected into the grid, which will cause power grid pollution, and the power quality problems have become increasingly serious .Active Power Filter (APF) is an important device for the power system harmonics and reactive power compensating. The real-time control and accuracy is a key to achieving effective compensation. Several suitable for active power filters basic principle of the compensation current control strategy is introduced in this paper, the paper carries on the contrast analysis, and points out the advantages and disadvantages of each, The development of the control strategy of the active filter can achieve a better performance and a wider range of application.

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Sladić, Saša, Srđan Skok, and David Nedeljković. "Efficiency Considerations and Application Limits of Single-Phase Active Power Filter with Converters for Photoenergy Applications." International Journal of Photoenergy 2011 (2011): 1–8. http://dx.doi.org/10.1155/2011/643912.

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A new way of connecting PV sources to adaptive voltage active power filter (AV APF) has been compared with classic approach including active power filter (APF). In standard active power filter applications a relatively high DC link voltage (500 V or even more) with a buck converter or lower voltage (approx. 100 V) with boost converter can be used. These two converters appear also in adaptive voltage circuit of AV APF, but in this case it is possible to achieve many different connections of DC source. Benefit of this approach is that the same circuit is used for improving switching conditions in APF and for connection of solar cells. It appears that these two functions support each other and a large variety of DC voltages and currents can be connected to AC mains. Experimental results confirm expectations of increased energy transfer from additional DC source to network, especially for DC voltages being lower than DC link voltage.

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Tan, Xing Guo, Gao Ming Feng, Li Zhang, and Lei Cao. "Parameters Optimization Design of Four-Switch Three-Phase Shunt Active Power Filter." Applied Mechanics and Materials 273 (January 2013): 316–21. http://dx.doi.org/10.4028/www.scientific.net/amm.273.316.

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The working capability and cost of four-switch three-phase (FSTP) shunt active power filter (APF) are determined by the parameter selection. Based on mathematical model of FSTP inverter, the effect of key parameters, such as dc-bus voltage level and capacitor voltage transform is analyzed. On account of ac output filter inductance, voltage and capacitance on dc side, output filter in the design of four-switch three-phase APF, this paper expounds the optimal selection approach of parameters, sets up simulation model in PSIM, correctness of the method is verified by simulation on the basis of analysis about law of effect.

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Liu, Baolian, Zujun Ding, Huanyu Zhao, and Defei Jin. "Active Power Filter DC Bus Voltage Piecewise Reaching Law Variable Structure Control." Journal of Applied Mathematics 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/835720.

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The DC bus voltage stability control is one key technology to ensure that Active Power Filter (APF) operates stably. The external disturbances such as power grid and load fluctuation and the system parameters changing may affect the stability of APF DC bus voltage and the normal operation of APF. The mathematical model of DC bus voltage is established according to power balance principle and a DC bus voltage piecewise reaching law variable structure control algorithm is proposed to solve the above problem, and the design method is given. The simulation and experiment results proved that the proposed variable structure control algorithm can eliminate the chattering problem existing in traditional variable structure control effectively, is insensitive to system disturbance, and has good robustness and fast dynamic response speed and stable DC bus voltage with small fluctuation. The above advantages ensure the compensation effect of APF.

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Chelli, Z., R. Toufouti, A. Omeiri, and S. Saad. "Hysteresis Control for Shunt Active Power Filter under Unbalanced Three-Phase Load Conditions." Journal of Electrical and Computer Engineering 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/391040.

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This paper focuses on a four-wire shunt active power filter (APF) control scheme proposed to improve the performance of the APF. This filter is used to compensate harmonic distortion in three-phase four-wire systems. Several harmonic suppression techniques have been widely proposed and applied to minimize harmonic effects. The proposed control scheme can compensate harmonics and reactive power of the nonlinear loads simultaneously. This approach is compared to the conventional shunt APF reference compensation strategy. The developed algorithm is validated by simulation tests using MATLAB Simulink. The obtained results have demonstrated the effectiveness of the proposed scheme and confirmed the theoretical developments for balanced and unbalanced nonlinear loads.

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Ou, Zuoyuan, Yingpin Wang, Chang Su, Yi Qu, Hongyan Peng, and Xuguang Hao. "Precise model of LC active power filter and feedback linearization control." Journal of Physics: Conference Series 2232, no. 1 (May 1, 2022): 012012. http://dx.doi.org/10.1088/1742-6596/2232/1/012012.

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Abstract The problems of regulating power quality are more prevalent. In general, Active power filter(APF) is one of the best solution. But the influence of load impedance and grid impedance were widely ignored by a great number of papers, supposed the load voltage is constant and modeling in APF singly, which can’t describe the system accurately. Firstly,there are build an accurate model, including LC APF, load and grid impedance. Secondly, applying feedback linearization and proportional resonant differentiation (FL-PRD) control in inner current loop. Then analyze the influence of load and grid impedance. Once more,checked the accuracy of builded accurate model by Simulink and experiment. Eventually, compare mentioned algorithm in the paper with classical proportional resonant (PR) controller. The results show that it is rather important to set up an accurate model and the proposed algorithm gets a perfect capacity.

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Mhawi, Ekhlas, Hamdan Daniyal, and Mohd Herwan Sulaiman. "Advanced Techniques in Harmonic Suppression via Active Power Filter: A Review." International Journal of Power Electronics and Drive Systems (IJPEDS) 6, no. 2 (June 1, 2015): 185. http://dx.doi.org/10.11591/ijpeds.v6.i2.pp185-195.

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This paper intends to present the recent development of artificial intelligence (AI) applications in active power filter (APF). As a result of the development in power electronic technology, (APF) continues to attract ample attention. Compared with the traditional reactive LC filter, active power filter is considered to be more effective in compensating harmonic current generated by nonlinear loads.APF, can correct the power quality and improve the reliability and stability on power utility. A brief explanation of some important areas in AI and a comprehensive survey of the literature along the main categories of AI is presented to introduce the readers into the wide-ranging topics that AI encompasses. Plenty of relevant literatures have been selected in the review, mostly emphasized on better accuracy, robustness, efficiency, stability and tracking ability of the system.

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Barnabé, Felipe, Marco Rocha, and Guilherme Clerice. "Enhancement of Power Quality Using Voltage and Hall Effect Current Sensors Applied on Controlled Single-Phase Active Power Filter." Engineering Proceedings 2, no. 1 (November 14, 2020): 74. http://dx.doi.org/10.3390/ecsa-7-08212.

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Switched-mode power supply and semiconductor devices have been gaining more and more applicability in the industrial scenario. With the massive use of these devices, several problems related to power quality and equipment degradation have been arising, caused mainly by the harmonic content present in current and voltage. Power quality problems have direct implications for business productivity, causing high economic losses. Therefore, it is mandatory to develop solutions that mitigate these problems. Active power filters (APF) are power electronic equipment capable of compensating power quality problems. Moreover, it presents the ability to dynamically adjust their modes of operation in response to changes in load or the power systems. Active power filters present the economical advantage of using the same current and voltage sensors already existing in a power system. Aiming to develop an APF for single-phase applications, this work proposes a shunt controlled active power filter using hall effect current and voltage sensor, aiming to compensate harmonic currents provided by nonlinear loads. It was proposed two proportional-integral compensators, where the external loop is responsible for link-CC control and the inner loop is responsible for current compensation. The results show the applicability of the proposed APF, since all harmonic content was filtered.

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Yu, Shengbao, Nan Chen, Lihui Gao, Haigen Zhou, and Yong Huang. "Suppressing Conducted DM EMI in an Active Power Filter via Periodic Carrier Frequency Modulation." Energies 12, no. 10 (May 18, 2019): 1903. http://dx.doi.org/10.3390/en12101903.

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Active power filters (APF) aim at solving the harmonic problem originated by the nonlinear load in power systems. However, the high dv/dt and di/dt outputs from power electronic devices in a voltage source converter on APF introduced unwanted conducted electromagnetic interference (EMI) when compensating for the low-frequency harmonic components. Hence, this paper develops a spectrum analysis approach to investigate and quantify the source differential-mode (DM) voltage of a single-phase shunt APF to suppress the DM EMI via periodic carrier frequency modulation (PCFM). In this scheme, the analytical expressions of source DM voltage in the APF using the PCFM scheme are obtained with a double Fourier series. In addition, the influence of PCFM parameters on the source DM voltage spectrum is predicted based on the analytical expression. As a result, the PCFM parameters, which have the best suppression effect on the DM EMI are obtained. The experiment results proved the validity of the sawtooth PCFM APF with the maximum frequency deviation equal to 800 Hz in alleviating the APF DM EMI.

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Fang, Yunmei, and Juntao Fei. "Adaptive Backstepping Current Control of Active Power Filter Using Neural Compensator." Mathematical Problems in Engineering 2019 (May 16, 2019): 1–9. http://dx.doi.org/10.1155/2019/5130738.

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A backstepping-based adaptive controller with neural compensator is designed for harmonic suppression in a three-phase active power filter (APF). The fundamental rule of backstepping method is to take some state variables as “virtual controls” and then design intermediate controller. An adaptive neural controller using radial basis function (RBF) is derived to estimate the APF system nonlinearity and strengthen the current’s tracking property and power grid quality. Simulations studies indicate the proposed backstepping-based adaptive neural controller has good current tracking behavior and increased power quality.

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Jamuna, P., and S. Ramesh. "Experimental Validation of Impedance Source Network Based Active Power Filter for Interconnection of PV System into Grid." Journal of Circuits, Systems and Computers 27, no. 14 (August 23, 2018): 1850215. http://dx.doi.org/10.1142/s0218126618502158.

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This paper proposes a Solar Photovoltaic (SPV) interfaced Impedance Source Inverter (ZSI) based shunt Active Power Filter (APF) for compensation of power quality events such as current harmonics, voltage interruption and reactive power burden. The instantaneous reactive power theories with Fuzzy Logic Controller (FLC) based DC link voltage regulator is used to estimate the reference current signal and control the operation of the SPV interfaced shunt APF. Maximum Power Point Tracking (MPPT) algorithm is also employed to obtain the optimum maximum power point. The response of the SPV interfaced ZSI-shunt APF for mitigation of current harmonic distortions and reactive power compensation are investigated and compared with SPV interfaced Voltage Source Inverter (VSI) based shunt APF. The proposed SPV interfaced shunt APF employed with the FLC-based instantaneous reactive power theory control algorithm offers long lasting compensation against current-based distortions and reactive power requirements. The performance of the SPV interfaced ZSI based shunt APF has been verified by the simulation and experimental study. These results confirm the practicability of the proposed system in various load conditions with effective harmonic mitigation capability.

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Adel, Mohamed, and Tarek Kandil. "Assessment of Direct and Indirect Current Control Techniques Applied to Active Power Filters." Recent Advances in Electrical & Electronic Engineering (Formerly Recent Patents on Electrical & Electronic Engineering) 13, no. 8 (December 3, 2020): 1256–65. http://dx.doi.org/10.2174/2352096513999200710143353.

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Background: In this paper, an assessment of active power filter (APF) performance is presented under direct and indirect current control schemes through on-line compensation theory. Methods: Conventional Direct Current Control (DCC) measures both load current and filter current beside source and DC-link voltages, while Indirect Current Control (ICC) measures only source current beside voltage measurements. Both DCC and ICC control algorithms are implemented using 80C196KC low-cost microcontroller. Results: The performance parameters of APF are compared under two methods, and it is assigned that ICC gives a better performance with lower cost due to reduced number of sensors. The DC-link output voltage is controlled through simple PI-controller, and the PWM switching signals required by APF power circuit is obtained by hysteresis current controller. Conclusion: The comparative simulation and experimental results exhibit that performance of APF due to ICC scheme is superior than DCC one.

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P., Sandhya, and Nagaraj R. "Modeling of hybrid active power filter using artificial intelligence controller: hardware and software prospective." International Journal of Power Electronics and Drive Systems (IJPEDS) 12, no. 4 (December 1, 2021): 2545. http://dx.doi.org/10.11591/ijpeds.v12.i4.pp2545-2556.

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<span lang="EN-US">The power factor is a significant concern in power systems. The significant power loss occurred due to electronic and electrical equipment damages affected by the deviation of physical characteristics, including voltage, current, and frequency parameters.The power loss and quality issues were resolved by introducing filtering techniques in electronic and electrical equipment. Many filtering techniques include passive filtering (PF), Active power filter (APF), and many hybrid approaches are already available. Most of these methods use proper compensation controlling approaches and failed to minimize the total harmonic distortion (THD), and harmonic mitigation in power systems has its best. In this article, an efficient Hybrid-APF using Artificial-Neuro Fuzzy interface system (ANFIS) for software and hardware perspective is designed. The proposed approach uses hybrid controlling strategies which include PI with artificial intelligence (ANFIS) controller, to control the power losses for H-APF. Additionally, current compensation is achieved by PQ-theory, followed by Hysteresis-Current- Controller (HCC). The hardware architecture of ANFIS with HCC is designed to improve the chip-area for real-time power applications.The present work analyzed by simulating the voltage and current waveform. The proposed-H-APF using ANFIS controller, both software and hardware approaches, is compared with other control techniques like H-APF with PI and Fuzzy logic controller by concerning THD,Reactive power, and Different Harmonics and loads improvements.</span>

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Li, Zhi Yong, Yu Xun Luo, and Ling Fei Shen. "Modified Direct Power Control for LCL-APF without Harmonic Current Detection." Applied Mechanics and Materials 433-435 (October 2013): 1210–17. http://dx.doi.org/10.4028/www.scientific.net/amm.433-435.1210.

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The active power filter with LCL filter (LCL-APF) possesses the advantages of wide bandwidth of compensation and a small amount of switching ripples. A direct power control (DPC) method of LCL-APF without harmonic current detection technology is proposed. Not only the complex detection of load harmonic current and compensation harmonic current is omitted, but also the total rate of harmonic distortion of grid side is reduced from 27.7% to 1.12%. To overcome the disadvantages of resonance caused by three-order LCL filter, the power of active power damping is added in the power controller. Thus, the dynamic control performance of LCL-APF is improved, as stable waveforms of grid current and power after 0.04s proved. Meanwhile, a modified DPC control loop is formed. Simulation results prove that the proposed method is correct and feasible. In view of the fact that it is rapid and accurate, especially the power level of 150kW, so it is suitable for the distributed generation system.

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Wang, Xiao Ming, Xing Yao Xiang, Wan Ci Liu, and Li Zhang. "A Novel Control Strategy of Active Power Filter." Applied Mechanics and Materials 472 (January 2014): 343–47. http://dx.doi.org/10.4028/www.scientific.net/amm.472.343.

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To improve the dynamic response and of compensation characteristic three-phase shunt active power filter(APF),a novel control strategy was proposed based on supply voltage detection. Fundamental wave current controller and dc side voltage controller was designed in detail. This method can not only compensate the parameter is determined and position distortion load, also can compensate the uncertain load.The superiority of the control architecture proposed is verified completely by simulation results.

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Suresh, P., and G. Vijayakumar. "Shunt Active Power Filter with Solar Photovoltaic System for Long-Term Harmonic Mitigation." Journal of Circuits, Systems and Computers 29, no. 05 (July 31, 2019): 2050081. http://dx.doi.org/10.1142/s0218126620500814.

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This paper proposes a shunt Active Power Filter (APF), supported by Solar Photovoltaic (SPV) system for a grid-connected application that improves power quality. The reference signal for the shunt APF is obtained from the adaptive Proportional Integrative Derivatives (PID), based on an algorithm of Least Mean Eighth (LME) with Unit Vector Template (UVT). The LME algorithm distinguishes the basic weight sections from load currents and estimates the three phase reference source current. These reference currents are used to generate a gate signal for the shunt APF. The DC-link voltage regulator is used to keep the constant DC-link voltage of the shunt APF with an APID controller. To reduce present distortions of electric power distribution systems, a design of a suitable controller is conducted using an intelligent computational technique for predicting the right reference signals. The SPV scheme is designed to obtain the highest energy output from the SPV panel with the maximum power point tracking algorithm (MPPT) scheme and is connected to the power grid. For long-term harmonic mitigation, the SPV system continuously maintains the DC-link of the shunt APF. Mathematically, the presented current reference signal generation scheme is examined and digital simulation outcomes are displayed under distinct steady and dynamic state conditions. Lastly, the complete scheme is validated by using the hardware prototype.

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Rui, Xiong, Zi Qiang Xi, and Miao Zhou. "Study on the Specific Harmonic Suppression of Active Power Filter." Applied Mechanics and Materials 556-562 (May 2014): 1945–49. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.1945.

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Aiming at the problems that the traditional active power filter (APF) which is with limited bandwidth and is difficult to realize zero steady-state error control, we use a strategy based on multiple synchronous rotating coordinate for each harmonic separation to achieve the detection of selective harmonic and proportion-integral (PI) control. Then it’s able to implement zero steady-state error compensation. After establishing the mathematical model of harmonic rotating coordinate for the APF, we proposed a simple strategy of current coupling and decoupling. The simulation results and the prototypes’ practical operations proved that the control strategy can compensate for the selective harmonic effectively and respond to the changes of the conditions in time. Meanwhile it has good characteristics in dynamic response.

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Journal articles on the topic 'Active power filter (APF)'

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