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International Conference on Circuit, Power and Computing Technologies (ICCPCT)

作者： Kohila, J. Kannan, S. Kumar, V. Suresh Kalasalingam Univ Dept EEE Krishnankoil India Ramco Inst Technol Dept EEE Rajapalayam India Kalasalingam Univ Dept EEE Power Elect & Drives Krishnankoil India

ISBN: (纸本)9781479970759

This paper presents a synchronous reference frame theory(SRF theory) based control strategy for Dynamic Voltage Restorer(DVR) using MATLAB/SIMULINK. The DVR is a normal three phase inverter which converts DC to AC and vice-versa using the dc link capacitor. Whenever utility is distorted by voltage related faults, DVR is active and it protects the load from utility distortions. The control strategy for the DVR plays an important role to make the DVR in active condition whenever distortion occurs. SRF theory is a simple and suitable control strategy for DVR. It acts as the heart of the DVR. This paper also deals with how the DVR is performing under three phase voltage distortion conditions using MATLAB/SIMULINK.

关键词： DVR synchronous reference frame theory Voltage sag PLL

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Experimental Investigations on Particle Swarm Optimization Based Control Algorithm for Shunt Active Power Filter to Enhance Electric Power Quality

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IEEE ACCESS 2022年 10卷 54878-54890页

作者： Kumar, Ravinder Bansal, Hari Om Gautam, Aditya R. Mahela, Om Prakash Khan, Baseem Dr BR Ambedkar Natl Inst Technol Dept Elect Engn Jalandhar 144027 Punjab India Birla Inst Technol & Sci Dept Elect & Elect Engn Pilani 333031 Rajasthan India Rajasthan Rajya Vidyut Prasaran Nigam Ltd Power Syst Planning Div Jaipur 302005 Rajasthan India Hawassa Univ Dept Elect & Comp Engn Awasa 05 Ethiopia

Quality power is a very important factor for the proper functioning of appliances and can be enhanced using shunt active power filters (SAPF). This work demonstrates the hardware implementation of synchronous reference frame (SRF) theory based SAPF. This paper presents the technique of particle swarm optimization (PSO) to tune the gain values of the SAPF PI controller to control the voltage of the DC-link and enhance its dynamic efficiency. The estimation of gain values of PI controllers using conventional methods does not yield the expected outcomes under varying load conditions. The PSO tuned controller provides better results as compared to traditional tuning methods. The switching scheme is implemented using hysteresis controller to control the SAPF. The main objectives of this approach are to extract the compensating currents and cancel out the harmonics produced by balanced, unbalanced and nonlinear loads. The planned scheme is designed and implemented in MATLAB/Simulink and then its performance on a developed laboratory prototype is validated experimentally.

关键词： Power harmonic filters Harmonic analysis Active filters Voltage control Power quality Power filters Reactive power Harmonic mitigation hysteresis current controller particle swarm optimization PI~controller power quality shunt active power filter synchronous reference frame theory

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Photovoltaic based distribution static compensator for power quality improvement

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INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS 2012年第1期42卷 685-692页

作者： Kannan, V. Kamatchi Rengarajan, N. KSR Coll Engn Dept Elect & Elect Engn Tiruchengode Tamil Nadu India

This paper deals with a model of photovoltaic (PV) array or battery operated DC/DC boost converter fed three-leg VSC (Voltage Source converter) with star delta transformer for power quality improvement. A synchronous reference frame theory is proposed for three-phase four-wire DSTATCOM (Distribution Static Compensator) which includes voltage source converter and a dc link capacitor. The proposed DSTATCOM provides reactive power compensation, source harmonic reduction and neutral current compensation at the point of common coupling (PCC). The PV array or battery operated boost converter is used to step up the voltage to match the DC link requirement of the three-leg VSC. The main advantage of this proposed approach is that, it will provide continuous compensation for the whole day. The star/delta transformer provides isolation to the VSC and path to the zero sequence fundamental as well as harmonics neutral current. To derive the reference current in order to generate the firing pulse to the VSC, the overall system is designed, developed and validated by using MATLAB-SIMULINK environment. (c) 2012 Elsevier Ltd. All rights reserved.

关键词： Boost converter Photovoltaic array Voltage source converter Star/delta transformer synchronous reference frame theory Distribution static compensator

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Performance evaluation of FPGA-based predictive current controller for FL-DSTATCOM in electric distribution system

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IET GENERATION TRANSMISSION & DISTRIBUTION 2019年第19期13卷 4400-4409页

作者： Dheepanchakkravarthy, Azhagesan Jawahar, Marappan Rakkiannan Venkatraman, Kandadai Selvan, Manickavasagam Parvathy Moorthi, Sridharan Bannari Amman Inst Technol Dept Elect & Elect Engn Sathyamangalam India Natl Inst Technol Dept Elect & Elect Engn Hybrid Elect Syst Lab Tiruchirappalli 620015 Tamil Nadu India Vardhaman Coll Engn Dept Elect & Elect Engn Hyderabad India

A four-leg distribution static compensator (FL-DSTATCOM) has been employed for improving the quality of power in electric distribution system using field-programmable gate array (FPGA). A predictive current control technique without any modulation scheme is utilised to generate switching pulses for FL-DSTATCOM using a cost function defining the preferred system behaviour. This technique makes the supply current as balanced and sinusoidal by exactly tracking the reference current, compensating the reactive power, maintaining near unity power factor and nullifies the current flow in neutral conductor during steady and dynamic state conditions. synchronous reference frame theory is effectively implemented for extracting the reactive and harmonic part of load current which are the primary components in the evaluation of reference currents. The predictive current control scheme implemented in FPGA has been deployed to evaluate the behaviour of the FL-DSTATCOM under multifarious loading conditions.

关键词： field programmable gate arrays predictive control power factor electric current control static VAr compensators power distribution control digital control power supply quality reactive power FL-DSTATCOM electric distribution system four-leg distribution static compensator field-programmable gate array supply current unity power factor current flow load current performance evaluation FPGA-based predictive current controller system behaviour reactive power compensation power quality switching pulse generation cost function reference current tracking neutral conductor dynamic state conditions steady state conditions synchronous reference frame theory reference current evaluation multifarious loading conditions near unity power factor

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Single-phase phase locked loop with DC offset and noise rejection for photovoltaic inverters

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IET POWER ELECTRONICS 2014年第9期7卷 2288-2299页

作者： Lubura, Slobodan Soja, Milomir Lale, Srdan Ikic, Marko Univ East Sarajevo Fac Elect Engn RS East Sarajevo Bosnia & Herceg

Proper work of grid-connected converters requires an accurate detection of phase angle, frequency and amplitude of grid voltage. Phase locked loops (PLLs) based on synchronous reference frame theory can be used for estimation of these grid parameters. One of the issues that could appear during estimation of grid parameters is appearance of DC offset in measured grid voltage. This DC component (offset) is usually entered in PLL structure via measurement and A/D conversion process. Undesirable induced DC offset could appear as part of the reference sine current of photovoltaic inverters or other grid-connected converters. A lot of standards define allowed PV inverter's DC current injection in the grid. In this study, we propose an improved PLL structure with capability to fully reject DC offset and noise which could appear in measured input grid voltage. The key component of the proposed PLL is two-phase generator with a closed control loop for DC offset and noise rejection. Obtained simulation and experimental results show that the proposed PLL structure can solve important issues of presence of noise and DC offset in measured grid voltage. The proposed PLL structure shows excellent dynamical performances in conditions of fast changes of grid parameters.

关键词： phase locked loops photovoltaic power systems invertors power system parameter estimation power grids single-phase phase locked loop DC offset noise rejection photovoltaic inverters grid-connected converters phase angle detection grid voltage synchronous reference frame theory grid parameter estimation DC component A/D conversion process PLL structure PV inverter DC current injection input grid voltage two-phase generator closed control loop IEC standards IEEE standards reference sine current

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DVR-based power quality enhancement using adaptive particle swarm optimisation technique

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INTERNATIONAL JOURNAL OF BIO-INSPIRED COMPUTATION 2021年第2期18卷 92-104页

作者： Srinivas, L. Ravi Babu, B. Mahesh Ram, S. S. Tulasi GEC Dept EEE Gudlavalleru AP India GNITS Dept EEE Hyderabad TS India

This paper proposes a heuristic control of the series active power filter for power quality enhancement. In the context of power quality, the series active filter is better utilised as a voltage source controller contrary to its conventional usage as variable impedance. The present day utility system as a linear model is unsatisfactory and the steps are laid down to discuss utility systems as a nonlinear model. This paper deals with comparative analysis of particle swarm optimisation (PSO) and its contemporary modified PSO algorithms modified particle swarm optimisation (MPSO), and adaptive particle swarm optimisation (APSO). The harmonic reduction in the source current and sags/swells mitigation in the load voltage is carried out with the optimal tuning of the PI controller. The series active power filter as a harmonic suppressor with a specific reference controlled strategy is discussed in this paper. The synchronous reference frame (SRF) theory and its modified versions are used to generate a compensating signal. The hysteresis band current controller (HBCC) is used to perform the switching operation of voltage source inverter. Simulations are carried out in the MATLAB/Simulink environment.

关键词： dynamic voltage restorer DVR synchronous reference frame theory SRFT particle swarm optimisation PSO

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Design and implementation of Legendre-based neural network controller in grid-connected PV systems

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IET RENEWABLE POWER GENERATION 2019年第15期13卷 2783-2792页

作者： Arora, Ankita Singh, Alka Delhi Technol Univ Dept Elect Engn Bawana Rd Delhi 110042 India

This study presents the development of Legendre-based functional neural network algorithm for shunt compensation in photovoltaic (PV)-based grid-connected system. The controller is developed for improving power quality (PQ) and the compensator is controlled to work in current control mode. It injects the requisite compensating current depending on the nature of the load current. The compensator is also interfaced with PV source and the controller design incorporates its contribution too. Some of the PQ problems studied include curtailment of harmonics, providing necessary reactive power, power factor improvement and so on. Results under distorted grid, varying solar irradiation and variety of loads have been presented. The proposed algorithm is designed using non-linear functional Legendre expansion of load current and has not been used for compensation or PQ problem alleviation till date. Both simulation and experimental results verify that the proposed algorithm performs far better than the adaptive popular backpropagation multilayer perceptron neural network, recurrent neural network and non-adaptive conventional synchronous reference frame theory based techniques.

关键词： power grids electric current control recurrent neural nets power supply quality neurocontrollers photovoltaic power systems power factor backpropagation multilayer perceptrons compensation reactive power control control system synthesis adaptive control Legendre polynomials Legendre-based neural network controller grid-connected PV systems Legendre-based functional neural network algorithm shunt compensation photovoltaic-based grid-connected system power quality current control mode load current PV source controller design PQ problems power factor improvement distorted grid solar irradiation nonlinear functional Legendre expansion backpropagation multilayer perceptron neural network reactive power recurrent neural network synchronous reference frame theory

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Development and performance analysis of PSO-optimized sliding mode controller-based dynamic voltage restorer for power quality enhancement

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INTERNATIONAL TRANSACTIONS ON ELECTRICAL ENERGY SYSTEMS 2020年第3期30卷 1-14页

作者： Jeyaraj, Kohila Durairaj, Devaraj Velusamy, Agnes Idhaya Selvi Kalasalingam Acad Res & Educ Dept Elect & Elect Engn Krishnankoil India

In the distribution power system, voltage sag and swell are the critical issues. The impact of this issue creates major economic loss and power loss in the distribution system. There are several detection methods available, mainly, connecting the FACTS devices such as Static Compensator (STATCOM), Unified Power Quality Conditioner (UPQC), and dynamic voltage restorer (DVR) at the point of sag or swell. DVR is one of the custom power devices to mitigate the voltage sag and swell. Sliding mode controller (SMC) is proposed in the paper, which is used to regulate the DVR to mitigate the voltage sag issue. Particle swarm optimization (PSO) algorithm is utilized in this work to find the optimum value of SMC parameters, namely, K-p and K-i, with the objective of minimizing the integral square error (ISE). A simple two feeder distribution network with DVR is developed in MATLAB-SIMULINK to assess the performance of DVR under various faults and disturbed situations. The mitigation level and THD values of PSO-optimized SMC-based DVR results are compared with the PI controller-based DVR, PSO-optimized PI controller DVR, and SMC-based DVR. At last, in the proposed method, the trial is taken by adding a renewable energy resource, that is, PV farm at 400-kW power rating. The solar energy is integrated with the existing distribution system, and the results are incorporated. Simulation results show that the PSO-optimized SMC-based DVR can compensate the voltage sag and swell and also reduce the load voltages efficiently.

关键词： dynamic voltage restorer particle swarm optimization power quality sliding mode controller synchronous reference frame theory

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Control and operation of a solar PV-battery-grid-tied system in fixed and variable power mode

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IET GENERATION TRANSMISSION & DISTRIBUTION 2018年第11期12卷 2633-2641页

作者： Beniwal, Neha Hussain, Ikhlaq Singh, Bhim Indian Inst Technol Delhi Dept Elect Engn New Delhi 110016 India Univ Kashmir Inst Technol Dept Elect Engn Srinagar Jammu & Kashmir India

In this work, a simple phase-locked loop - less control is presented for a single-stage solar photovoltaic (PV) - battery-grid-tied system. As compared to traditional solar PV systems, the system has reduced losses due to the absence of boost converter and a flexible power flow due to the inclusion of a storage source (battery). The synchronous reference frame theory is used to generate the pulses for switching the voltage-source converter (VSC), while maximum power is extracted from the solar PV array by using perturb and observe-based maximum power point tracking technique. The inherent feature of shunt active filtering by the VSC has also been incorporated in this system. Test results for the system operation under fixed power and variable power mode are studied on a prototype developed in the laboratory. During fixed power mode, a fixed amount of power is fed to the grid, whereas in variable power mode the power fed to the grid varies. Test results obtained are in accordance with the IEEE-519 standard. This work is a basis for the upcoming power market, where solar PV consumers can manage the generated electricity and maximise their profit by selling the power to the grid judiciously.

关键词： solar power stations photovoltaic power systems power generation control battery storage plants phase locked loops power grids voltage-source convertors maximum power point trackers active filters power markets power generation economics power system management single-stage solar PV-battery grid-tied system phase-locked loop single-stage solar photovoltaic battery-grid-tied system boost converter power flow synchronous reference frame theory voltage-source converter maximum power extraction solar PV array perturb and observe-based maximum power point tracking technique shunt active filtering VSC variable power mode fixed power mode power market IEEE-519 standard electricity generation management

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Harmonic mitigation and power quality improvement in utility grid with solar energy penetration using distribution static compensator

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IET POWER ELECTRONICS 2021年第5期14卷 912-922页

作者： Mahela, Om Prakash Khan, Baseem Alhelou, H. H. Tanwar, Sudeep Padmanaban, Sanjeevikumar Rajasthan Rajya Vidyut Prasaran Nigam Ltd Power Syst Planning Div Jaipur Rajasthan India Hawassa Univ Dept Elect Engn Awasa Ethiopia Isfahan Univ Technol Dept Elect & Comp Engn Esfahan Iran Nirma Univ Dept Comp Sci & Engn Inst Technol Ahmadabad Gujarat India Aalborg Univ Dept Energy Technol Ctr Biol & Green Engn Esbjerg Denmark Tishreen Univ Dept Elect Power Engn Latakia 2230 Syria

Distribution static compensator is based on power electronic devices technology which is utilized to supply rapid changes in active power as well as reactive power of utility grids. This is useful to achieve corrections in power factor, balancing of load, compensation of current and filtering of harmonics. Therefore, proposed work investigates the improvement of the power quality by utilizing the distribution static compensator, which is equipped by battery energy storage system and interfaced to distribution network with solar photo voltaic (PV) energy integration. In the present study, distribution static compensator is controlled using a control strategy based on the synchronous reference frame theory. Customised IEEE-13 nodes test system incorporating solar PV generation and distribution static compensator, is utilized to perform the harmonic mitigation and power quality analysis. Disturbances of power quality and harmonics have been investigated due to abrupt changes in the insolation of solar radiation, outage of PV plant from grid and synchronization of PV plant to grid. MATLAB/Simulink environment is utilized to perform the study. Effectiveness of a developed approach is validated by comparing results of simulation with results extracted in real time using real time digital simulator. Results indicate that the developed method is more effective for harmonic mitigation and improving power quality of electrical power in distribution network integrated with solar PV generation. Performance of the approach is compared with the performance of methods reported in the literature to establish the suitability of the method for harmonics mitigation and power quality improvement in grid with solar energy.

关键词： harmonics suppression power quality disturbances Reliability Other power apparatus and electric machines Other power stations and plants Control of electric power systems power electronics solar PV generation power engineering computing power generation reliability power quality improvement power quality analysis customised IEEE-13 nodes test system distribution static compensator Energy resources Power supply quality and harmonics distribution networks Distribution networks MATLAB-Simulink environment power factor corrections control strategy harmonics filtering electrical power solar energy penetration load balancing PV plant outage power generation control synchronous reference frame theory reactive power Power engineering computing solar power harmonics mitigation battery storage plants battery energy storage system power grids Solar power stations and photovoltaic power systems distribution network solar photo voltaic energy integration static VAr compensators real time digital simulator solar radiation current compensation Power convertors and power supplies to apparatus distributed power generation power supply quality photovoltaic power systems active power Distributed power generation power electronic devices technology utility grid Power electronics, supply and supervisory circuits

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