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Journal articles on the topic 'PI-RES CONTROLLER'

Author: Grafiati

Published: 11 September 2023

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1

Gayathri Devi, K. S., and P. Sujatha Therese. "Optimized PI controller for 7-level inverter to aid grid interactive RES controller." Journal of Central South University 28, no. 1 (2021): 153–67. http://dx.doi.org/10.1007/s11771-021-4593-1.

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2

Vijayan, Maya, Ramanjaneya Reddy Udumula, Tarkeshwar Mahto, et al. "Optimal PI-Controller-Based Hybrid Energy Storage System in DC Microgrid." Sustainability 14, no. 22 (2022): 14666. http://dx.doi.org/10.3390/su142214666.

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Power availability from renewable energy sources (RES) is unpredictable, and must be managed effectively for better utilization. The role that a hybrid energy storage system (HESS) plays is vital in this context. Renewable energy sources along with hybrid energy storage systems can provide better power management in a DC microgrid environment. In this paper, the optimal PI-controller-based hybrid energy storage system for a DC microgrid is proposed for the effective utilization of renewable power. In this model, the proposed optimal PI controller is developed using the particle swarm optimizat

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Yousef, Ali Mohamed, Farag K. Abo-Elyousr, Ahmed Elnozohy, Moayed Mohamed, and Saad A. Mohamed Abdelwahab. "Fractional Order PI Control in Hybrid Renewable Power Generation System to Three Phase Grid Connection." International Journal on Electrical Engineering and Informatics 12, no. 3 (2020): 470–93. http://dx.doi.org/10.15676/ijeei.2020.12.3.5.

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The main objective of this paper is to allow renewable energy sources (RES) to actively participate within hybrid microgrid by proposing a new control system based on fractional order proportional integral (FOPI) controller. Fractional order proportional integral controller is a classical proportional integral (PI) in which the integral part is a fraction instead of integer numbers. The paper introduces a hybrid photovoltaic (PV), wind turbine and battery storage system connected to a three-phase grid. Three types of controller are considered and compared for a hybrid renewable energy system (

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Firouzjahi, M., and A. Shokri. "Optimal design and control for UPFC using the evolutionary algorithms." Bangladesh Journal of Scientific and Industrial Research 51, no. 3 (2016): 231–38. http://dx.doi.org/10.3329/bjsir.v51i3.29435.

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Among the Unified Power Flow Controller (UPFC) tools, Flexible Alternating Current Transmission Systems (FACTS) have ability to control the transmitted power, improve transient and dynamic stability and improve the profile of the voltage and damping of the oscillations in the power system. Using the proportional-integral (PI) and proportional-integral-derivative (PID) controllers is a custom method. Selecting the PI and PID coefficients is through different methods. Also designing a resistant controller which can control the system in different points of work has been continuously considered b

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Kumar, Kailash, Suyog Vinayak Pande, T. Ch Anil Kumar, et al. "Intelligent Controller Design and Fault Prediction Using Machine Learning Model." International Transactions on Electrical Energy Systems 2023 (April 29, 2023): 1–9. http://dx.doi.org/10.1155/2023/1056387.

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In a solar power plant, a solid phase transformer and an optimization coordinated controller are utilized to improve transient responsiveness. Transient stability issues in a contemporary electrical power system represent one of the difficult tasks for an electrical engineer due to the rise in uncertain renewable energy sources (RESs) as a result of the need for green energy. The potential for terminal voltage to be adversely impacted by this greater RES raises the possibility of electrical device damage. It is possible to use a solid state transformer (SST) or smart transformer to address a t

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Zhang, Guoqiang, Irfan Ahmed Khan, Amil Daraz, Abdul Basit, and Muhammad Irshad Khan. "Load Frequency Control of Marine Microgrid System Integrated with Renewable Energy Sources." Journal of Marine Science and Engineering 11, no. 4 (2023): 844. http://dx.doi.org/10.3390/jmse11040844.

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In seaports, low-carbon energy systems and energy efficiency have become increasingly important as a result of the evolution of environmental and climate change challenges. In order to ensure the continued success of seaports, technological advancements must be introduced to a number of systems, such as seaport vehicles, harbor cranes, and the power sources of berthed ships. Harbor areas might need a microgrid to handle these aspects. Typically, microgrids that substitute conventional generator units with renewable energy sources (RES) suffer from system inertia problems, which adversely affec

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Et.al, N. Pooja. "Energy Management System Designed for Residential Grid connected Micro Grid." Turkish Journal of Computer and Mathematics Education (TURCOMAT) 12, no. 3 (2021): 4627–34. http://dx.doi.org/10.17762/turcomat.v12i3.1867.

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This paper presents an energy management system supported by PI Controller for a residential grid connected micro grid with renewable hybrid generation (wind and photo voltaic) and battery system. Modeling hybrid system includes non conventional energy sources given at sporadic supply conditions and dynamic energy demand, and to make conceptual energy storage with the help of battery system . Designing an appropriate scheme that dynamically changes modes of renewable integrated system based on the availability of RES power and changes in load. Wind,PV are the primary power supply of the system

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Saleh, Amr, Hany M. Hasanien, Rania A. Turky, et al. "Optimal Model Predictive Control for Virtual Inertia Control of Autonomous Microgrids." Sustainability 15, no. 6 (2023): 5009. http://dx.doi.org/10.3390/su15065009.

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For the time being, renewable energy source (RES) penetration has significantly increased in power networks, particularly in microgrids. The overall system inertia is dramatically decreased by replacing traditional synchronous machines with RES. This negatively affects the microgrid dynamics under uncertainties, lowering the microgrid frequency stability, specifically in the islanded mode of operation. Therefore, this work aims to enhance the islanded microgrid frequency resilience using the virtual inertia frequency control concept. Additionally, optimal model predictive control (MPC) is empl

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Valluri, Ashok Babu. "Novel Control Approach with FRT capability for Grid connected HYBRID distributed generation system using ANN controller based DVR." International Journal for Research in Applied Science and Engineering Technology 9, no. 12 (2021): 2002–21. http://dx.doi.org/10.22214/ijraset.2021.39684.

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Abstract: For ever increasing power demand and depletion of conventional energy resources, Renewable Energy Systems (RES) became an alternative source of electricity to reduce the load stress on the Power Grid. Although several control & design modifications are presented in past literature to improve reliability & performance of through Distribution Generation (DG) technologies, they always fall short in some aspects of voltage stability and Fault Ride Through (FRT) capabilities. The main aim of the project is Protecting Critical load from Grid side altercations which occur due to har

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Reddy, Ch Rami, B. Srikanth Goud, Flah Aymen, Gundala Srinivasa Rao, and Edson C. Bortoni. "Power Quality Improvement in HRES Grid Connected System with FOPID Based Atom Search Optimization Technique." Energies 14, no. 18 (2021): 5812. http://dx.doi.org/10.3390/en14185812.

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An intelligent control strategy is proposed in this paper which suggests the Optimum Power Quality Enhancement (OPQE) of grid-connected hybrid power systems with solar photovoltaic, wind turbines, and battery storage. Unified Power Quality Conditioner with Active and Reactive power (UPQC-PQ) is designed with Atom Search Optimization (ASO) based Fractional-order Proportional Integral Derivative (FOPID) controller in the proposed Hybrid Renewable Energy Sources (HRES) system. The main aim is to regulate voltage while reducing power loss and reducing Total Harmonic Distortion (THD). UPQC-PQ is us

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Alam, Farooq, Syed Sajjad Haider Zaidi, Arsalan Rehmat, Muhammad Umair Mutarraf, Mashood Nasir, and Josep M. Guerrero. "Robust Hierarchical Control Design for the Power Sharing in Hybrid Shipboard Microgrids." Inventions 8, no. 1 (2022): 7. http://dx.doi.org/10.3390/inventions8010007.

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Hybrid microgrid optimization, integration, and control are becoming increasingly important. Renewable energy source integrations are being used more often in shipping ports, as well as on short-distance cruises and ferries. Several seaports presently lack cold ironing services, which are shore-based power stations that provide electricity to ships from the main utility grids. Furthermore, diesel engines and diesel generator-based shipboards must be continuously running and on-line when docking to provide additional loads of ships due to the absence of cold-ironing services at many ports. In t

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Liserre, M., R. Teodorescu, and F. Blaabjerg. "Multiple harmonics control for three-phase grid converter systems with the use of PI-RES current controller in a rotating frame." IEEE Transactions on Power Electronics 21, no. 3 (2006): 836–41. http://dx.doi.org/10.1109/tpel.2006.875566.

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13

Pahasa, Jonglak, Potejanasak Potejana, and Issarachai Ngamroo. "Multi-Objective Decentralized Model Predictive Control for Inverter Air Conditioner Control of Indoor Temperature and Frequency Stabilization in Microgrid." Energies 14, no. 21 (2021): 6969. http://dx.doi.org/10.3390/en14216969.

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Microgrid (MG) is a novel concept for a future distribution power system that enables renewable energy sources (RES). The intermittent RES, such as wind turbines and photovoltaic generators, can be connected to the MG via a power electronics inverter. However, the inverter interfaced RESs reduce the total inertia and damping properties of the traditional MG. Consequently, the system exhibits steeper frequency nadir and the rate of change of frequency (RoCoF), which may degrade the dynamic performance and cause the severe frequency fluctuation of the system. Smart loads such as inverter air con

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Nazia, S. B., and A. Satish Babu. "An Advanced Control and Stability Analysis of Wind Solar Integrated Microgrid." Journal of Energy Engineering and Thermodynamics, no. 32 (February 2, 2023): 1–11. http://dx.doi.org/10.55529/jeet32.1.11.

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In this article, we suggest a micro-grid methodology based on renewable energy sources (RES) in order to make more efficient use of renewable energy sources and use less energy from the traditional power grid. Off-grid, RES likes solar (generated by a photovoltaic panel) and wind can be stored in a battery and utilised to power loads. As an additional measure, a Fuzzy logic-based energy-saving method has been applied. Microgrids are used to integrate these systems in a decentralised fashion, and they provide a suite of technology solutions that facilitate communication between end users and di

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Nazia, S. B., and A. Satish Babu. "An Advanced Control and Stability Analysis of Wind Solar Integrated Microgrid." Journal of Energy Engineering and Thermodynamics, no. 32 (February 2, 2023): 1–11. http://dx.doi.org/10.55529/jeet.32.1.11.

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In this article, we suggest a micro-grid methodology based on renewable energy sources (RES) in order to make more efficient use of renewable energy sources and use less energy from the traditional power grid. Off-grid, RES likes solar (generated by a photovoltaic panel) and wind can be stored in a battery and utilised to power loads. As an additional measure, a Fuzzy logic-based energy-saving method has been applied. Microgrids are used to integrate these systems in a decentralised fashion, and they provide a suite of technology solutions that facilitate communication between end users and di

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16

Bal, Tanima, Saheli Ray, Nidul Sinha, Ramesh Devarapalli, and Łukasz Knypiński. "Integrating Demand Response for Enhanced Load Frequency Control in Micro-Grids with Heating, Ventilation and Air-Conditioning Systems." Energies 16, no. 15 (2023): 5767. http://dx.doi.org/10.3390/en16155767.

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Heating, ventilation and air-conditioning (HVAC) systems constitute the majority of the demands in modern power systems for aggregated buildings. However, HVAC integrated with renewable energy sources (RES) face notable issues, such as uneven demand–supply balance, frequency oscillation and significant drop in system inertia owing to sudden disturbances in nearby generation for a longer period. To overcome these challenges, load frequency control (LFC) is implemented to regulate the frequency, maintain zero steady-state error between the generation and demand, reduce frequency deviations and b

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17

Dey, Partha Pratim, Dulal Chandra Das, Abdul Latif, S. M. Suhail Hussain, and Taha Selim Ustun. "Active Power Management of Virtual Power Plant under Penetration of Central Receiver Solar Thermal-Wind Using Butterfly Optimization Technique." Sustainability 12, no. 17 (2020): 6979. http://dx.doi.org/10.3390/su12176979.

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Striving for the suppression of greenhouse emissions, the modern power network is facing fundamental changes with the utilization of renewable energies (REs) for the future carbon-free society. The utilization of intermittent renewable-green power needs a better power management system and virtual power plant (VPP) can be a vital candidate that meets this demand. This study investigates a coordinated control grid integrated virtual power plant (VPP) in the presence of Central Receiver Solar Thermal System (CRSTS), Wind Turbine Generator (WTG), and Electric Vehicle (EV). To this end, CRSTS empl

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18

Stojković, Jelena, Aleksandra Lekić, and Predrag Stefanov. "Adaptive Control of HVDC Links for Frequency Stability Enhancement in Low-Inertia Systems." Energies 13, no. 23 (2020): 6162. http://dx.doi.org/10.3390/en13236162.

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Decarbonization of power systems has put Renewable Energy Sources (RES) at the forefront when it comes to electric power generation. The increasing shares of converter-connected renewable generation cause a decrease of the rotational inertia of the Electric Power System (EPS), and consequently deteriorate the system capability to withstand large load-generation imbalances. Low-inertia systems are subjected to fast and large frequency changes in case of in-feed loss, where the traditional primary frequency control is not sufficient to preserve the frequency stability and to maintain the frequen

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19

Broday, Gabriel R., Luiz A. C. Lopes, and Gilney Damm. "Exact Feedback Linearization of a Multi-Variable Controller for a Bi-Directional DC-DC Converter as Interface of an Energy Storage System." Energies 15, no. 21 (2022): 7923. http://dx.doi.org/10.3390/en15217923.

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DC microgrids have shown to be a good approach for better accommodating stochastic renewable energy sources (RES) and for the charging of electric vehicles (EVs) at the distribution level. For this, fast-acting energy storage units (ESSs) are essential. This requires that both the bi-directional power converter topology and the control scheme present the right set of features. The ESS discussed in this paper consists of a new DC-DC converter based on a tapped inductor (TI) for a higher voltage gain at moderate duty cycles. The direction of the current in its intermediate inductor does not need

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20

Alam, Md Shafiul, Fahad Saleh Al-Ismail, and Mohammad Ali Abido. "PV/Wind-Integrated Low-Inertia System Frequency Control: PSO-Optimized Fractional-Order PI-Based SMES Approach." Sustainability 13, no. 14 (2021): 7622. http://dx.doi.org/10.3390/su13147622.

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A paradigm shift in power engineering transforms conventional fossil fuel-based power systems gradually into more sustainable and environmentally friendly systems due to more renewable energy source (RES) integration. However, the control structure of high-level RES integrated system becomes complex, and the total system inertia is reduced due to the removal of conventional synchronous generators. Thus, such a system poses serious frequency instabilities due to the high rate of change of frequency (RoCoF). To handle this frequency instability issue, this work proposes an optimized fractional-o

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21

Suvvala, Jayaprakash, and Kannaiah Sathish Kumar. "Implementation of EFC Charging Station by Multiport Converter with Integration of RES." Energies 16, no. 3 (2023): 1521. http://dx.doi.org/10.3390/en16031521.

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Electric vehicles (EVs) are gradually becoming an integral part of the drive to accomplish sustainable energy standards. Due to their limited onboard battery capacity, EVs’ expanding popularity creates a need for widespread charging stations. However, fast charging stations, particularly Extreme Fast Charging (EFC), may impose a hassle on the electrical system due to overload during peak hours, frequent power gaps, and voltage sag. To flatten the power supply, the photovoltaic (PV) Hybrid Energy Storage Systems (HESS) and the uncertain and variable nature of PV systems always include solar and

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22

Deng, Junli, Yuan Mao, and Yun Yang. "Distribution Power Loss Reduction of Standalone DC Microgrids Using Adaptive Differential Evolution-Based Control for Distributed Battery Systems." Energies 13, no. 9 (2020): 2129. http://dx.doi.org/10.3390/en13092129.

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With high penetrations of renewable energy sources (RES), distributed battery systems (DBS) are widely adopted in standalone DC microgrids to stabilize the bus voltages by balancing the active power. This paper presents an Adaptive Differential Evolution (ADE)-based hierarchical control for DBS to achieve online distribution power loss mitigation as well as bus voltage regulations in standalone DC microgrids. The hierarchical control comprises two layers, i.e., ADE for the secondary layer and local proportional-integral (PI) control for the primary layer. The secondary layer control provides t

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23

Alharbi, Mohammed, Muhammad Ragab, Kareem M. AboRas, et al. "Innovative AVR-LFC Design for a Multi-Area Power System Using Hybrid Fractional-Order PI and PIDD2 Controllers Based on Dandelion Optimizer." Mathematics 11, no. 6 (2023): 1387. http://dx.doi.org/10.3390/math11061387.

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In this article, the problem of voltage and frequency stability in a hybrid multi-area power system including renewable energy sources (RES) and electric vehicles has been investigated. Fractional order systems have been used to design innovative controllers for both load frequency control (LFC) and automatic voltage regulator (AVR) based on the combination of fractional order proportional-integral and proportional-integral-derivative plus double derivative (FOPI–PIDD2). Here, the dandelion optimizer (DO) algorithm is used to optimize the proposed FOPI–PIDD2 controller to stabilize the voltage

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Shetgaonkar, Ajay, Aleksandra Lekić, José Luis Rueda Torres, and Peter Palensky. "Microsecond Enhanced Indirect Model Predictive Control for Dynamic Power Management in MMC Units." Energies 14, no. 11 (2021): 3318. http://dx.doi.org/10.3390/en14113318.

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The multi-modular converter (MMC) technology is becoming the preferred option for the increased deployment of variable renewable energy sources (RES) into electrical power systems. MMC is known for its reliability and modularity. The fast adjustment of the MMC’s active/reactive powers, within a few milliseconds, constitutes a major research challenge. The solution to this challenge will allow accelerated integration of RES, without creating undesirable stability issues in the future power system. This paper presents a variant of model predictive control (MPC) for the grid-connected MMC. MPC is

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25

Lin, Y.-C., A. C. Hall, and A. H. R. W. Simpson. "A novel organ culture model of a joint for the evaluation of static and dynamic load on articular cartilage." Bone & Joint Research 7, no. 3 (2018): 205–12. http://dx.doi.org/10.1302/2046-3758.73.bjr-2017-0320.

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Objectives The purpose of this study was to create a novel ex vivo organ culture model for evaluating the effects of static and dynamic load on cartilage. Methods The metatarsophalangeal joints of 12 fresh cadaveric bovine feet were skinned and dissected aseptically, and cultured for up to four weeks. Dynamic movement was applied using a custom-made machine on six joints, with the others cultured under static conditions. Chondrocyte viability and matrix glycosaminoglycan (GAG) content were evaluated by the cell viability probes, 5-chloromethylfluorescein diacetate (CMFDA) and propidium iodide

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26

Tao, Wenjing, Ajoy K. Samanta, Waldemar Priebe та Ralph B. Arlinghaus. "Enhanced Jak2 Activation Correlates with β Chain Expression Leading to Phosphorylation of Tyrosine 177 of Bcr-Abl." Blood 114, № 22 (2009): 2170. http://dx.doi.org/10.1182/blood.v114.22.2170.2170.

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Abstract Abstract 2170 Poster Board II-147 We have previously published that NIH 3T3 cells, which are known to be resistant to Bcr-Abl transformation, are greatly stimulated to undergo Bcr-Abl oncogenic transformation by forced expression of the α and β chains of the human IL-3 receptor (Tao et al., Oncogene 2008). These studies further showed that expression of the receptor chains enhanced activation of Jak2 but had little effect on the ability of Bcr-Abl to activate STAT5, which readily occurred by expression of only Bcr-Abl. Recently we have shown (see Abstract by Samanta et al.) that treat

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Samykutty, Abhilash, Molly McNally, William M. MacCuaig, et al. "Abstract 300: Matrix metalloproteinase-9 responsive active targeted silica nanoparticles for pancreatic cancer detection by multispectral optoacoustic tomography." Cancer Research 82, no. 12_Supplement (2022): 300. http://dx.doi.org/10.1158/1538-7445.am2022-300.

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Abstract Purpose: Pancreatic ductal adenocarcinoma (PDAC) is the most lethal disease and the leading cause of cancer death worldwide. The survival rate of patients with this form of cancer is about 8%. The physiological barrier of the tumor microenvironment composed of a dense stroma and disorganized blood vessels creates a barrier for early identification and treatment of this deadly disease. In recent years, nanoparticle-based controlled delivery systems were developed to exploit the pathophysiology of biological systems such as acidic tumor microenvironment or the altered tumor-specific enz

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Mattioli, Milena, Elisabetta Stanzani, Valentino Ribecco, et al. "Abstract 2711: Smart encapsulation of a MEK inhibitor into M2-9SLP/mApoE-liposomes for specific GBM targeting." Cancer Research 83, no. 7_Supplement (2023): 2711. http://dx.doi.org/10.1158/1538-7445.am2023-2711.

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Abstract Among the main aberrations occurring in GBM, those in MEK/ERK and PI3K/akt/mTOR pathways predominate and confer GBM Stem-like Cells (GSCs) sustained proliferation and resistance to therapy. A panel of eight patient-derived primary GSCs lines have been screened for their sensitivity to a small kinase MEK inhibitor (MEKi) with AnnexinV/PI staining. Among these, five display a sensitive phenotype with at least 50% reduction on cell viability after 72 hours of treatment. Then, four cell lines, two MEKi-sensitive (ICH001 and ICH003) and two MEKi-resistant (ICH013 and ICH027) were selected

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Chowdhury, Uttam. "Regulation of transgelin and GST-pi proteins in the tissues of hamsters exposed to sodium arsenite." International Journal of Toxicology and Toxicity Assessment 1, no. 1 (2021): 1–8. http://dx.doi.org/10.55124/ijt.v1i1.49.

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Hamsters were exposed to sodium arsenite (173 mg As/L) in drinking water for 6 days. Equal amounts of proteins from urinary bladder or liver extracts of control and arsenic-treated hamsters were labeled with Cy3 and Cy5 dyes, respectively. After differential in gel electrophoresis and analysis by the DeCyder software, several protein spots were found to be down-regulated and several were up regulated. Our experiments indicated that in the bladder tissues of hamsters exposed to arsenite, transgelin was down-regulated and GST-pi was up-regulated. The loss of transgelin expression has been report

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"Grid Connected Hybrid Renewable Energy System with Various Controller Implementation." International Journal of Innovative Technology and Exploring Engineering 9, no. 4 (2020): 1003–11. http://dx.doi.org/10.35940/ijitee.c8953.029420.

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In power industry due to fast industrialization the generation system has upswing towards strongly procuring energy from various non-conventional energy sources (RES). Persistent work is carried out in order to use additional energy obtained from the renewable sources and limiting the dependence on the conventional energy sources. The amalgamation of various Hybrid Renewable Energy Sources (HRES) i.e. Solar, Wind and Fuel cell including load forms a Micro grid, the realistic management of energy from these renewable sources to accommodate the demand at the consumer end with proper efficiency i

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Kumar, Ashok, and Nand Lal Shah. "Designing UPFC with Controller Driving Dual Converter Topology in a Grid Integrated PV System." SMART MOVES JOURNAL IJOSCIENCE, April 28, 2022, 22–31. http://dx.doi.org/10.24113/ijoscience.v8i4.484.

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Renewable energy source (RES)-based electricity generating plants are expensive and complicated, requiring controls to deal with the energy input's intermittent renewables and fluctuation. If the grid interface of these devices is not monitored and maintained within the norms, it presents a problem of providing electricity to the utilities. Thus researchers have discusses several grid interface and control strategies for RES-based generators. This paper discusses the technique of improving power quality by using UPFC (Unified Power Flow Control) having PI controller.

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Kumar, Ashok, and Nand Lal Shah. "Designing UPFC with Controller Driving Dual Converter Topology in a Grid Integrated PV System." SMART MOVES JOURNAL IJOSCIENCE, April 28, 2022, 22–31. http://dx.doi.org/10.24113/ijoscience.v8i4.484.

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Renewable energy source (RES)-based electricity generating plants are expensive and complicated, requiring controls to deal with the energy input's intermittent renewables and fluctuation. If the grid interface of these devices is not monitored and maintained within the norms, it presents a problem of providing electricity to the utilities. Thus researchers have discusses several grid interface and control strategies for RES-based generators. This paper discusses the technique of improving power quality by using UPFC (Unified Power Flow Control) having PI controller.

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33

Prasad, Dinanath, Narendra Kumar, and Rakhi Sharma. "Grid interfaced solar-wind hybrid power generating systems using fuzzy-based TOGI control technique for power quality improvement." Journal of Intelligent & Fuzzy Systems, March 15, 2021, 1–12. http://dx.doi.org/10.3233/jifs-189777.

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This paper bestows 3-phase grid interfaced solar-wind hybrid renewable energy system (RES), feeding three-phase loads. The proposed system includes solar photovoltaic, permanent magnet based synchronous generator (PMSG), DC-DC converter, maximum power point tracker (MPPT) based on incremental conductance, three phases IGBT based voltage source converter (VSC), with a third order generalized integrator (TOGI) control technique. This control technique bestows multifunctional capabilities as harmonic mitigations, load balancing, and reactive power compensation. A fundamental component of load cur

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