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[IEEE 2018 IEEE Power & Energy Society General Meeting (PESGM) - Portland, OR, USA (2018.8.5-2018.8.10)] 2018 IEEE Power & Energy Society General Meeting (PESGM) - Increasing Feeder PV Hosting Capacity by Regulating Secondary Circuit Voltages
摘要： Voltage rise is one of the major concerns that limits the photovoltaic (PV) hosting capacity or the maximum amount of PV generation that a distribution circuit can accommodate. This paper examines the effectiveness of low-voltage distribution static compensators (LV-DSTATCOMs) in increasing the PV hosting capacity of distribution circuits by mitigating voltage rise. Stochastic analysis framework is used to determine the PV hosting capacity while an iterative placement technique is used to identify effective device locations. To provide insights on the optimal device size, number, and control settings, sensitivity analysis is carried out. The results show that, with appropriate size and control settings, installation of few LV-DSTATCOMs in a distribution circuit can significantly increase its PV hosting capacity. For the circuit under consideration, a set of 23 devices has increased the PV hosting capacity from 15% to 100% of the median day time peak load.
关键词： Distribution circuit,Photovoltaics,FACTS device,Overvoltage,DSTATCOM
更新于2025-09-23 15:22:29
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Framework of Gradient Descent Least Squares Regression Based NN Structure for Power Quality Improvement in PV Integrated Low-Voltage Weak Grid System
摘要： This work proposes a novel gradient descent least squares regression (GDLSR) based neural network (NN) structure for control of grid-integrated solar PV (Photovoltaic) system with improved power quality. Here, a single layer neuron structure is used for the extraction of fundamental component (FC) from the load current. During FC extraction, GDLSR based NN structure attenuates harmonic components, noise, DC offsets, bias, notches and distortions from the nonlinear current, which improves the power quality under normal as well as under abnormal grid conditions. This single layer GDLSR-based NN structure has a very simple architecture, which decreases the computational burden and algorithm complexity. Therefore, it is easy in implementation. In this work, the GDLSR based control technique is tested on a single-phase single-stage grid-integrated PV topology with the nonlinear loads. The prime objective of the GDLSR based NN structure is to provide reactive power compensation, power factor correction, harmonics filtering and mitigation of other power quality issues. Moreover, when solar irradiation is zero, then the DC link capacitor and VSC, act as a distribution static compensator (DSTATCOM), which enhances the utilization factor of the system. The proposed system is modelled, and its performances are verified experimentally on a developed prototype in different grid disturbances as well as solar insolation variation conditions, which performances have satisfied the motive of proposed technique as well as the IEEE-519 standard.
关键词： Single-phase Grid,GDLSR based Control,Grid Integration,Single-stage Topology,Solar Energy,Power Quality,DSTATCOM
更新于2025-09-23 15:22:29
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LLMLF based Control Approach and LPO MPPT Technique for Improving Performance of a Multifunctional Three-Phase Two-Stage Grid Integrated PV System
摘要： This study presents a novel Leaky Least Mean Logarithmic Fourth (LLMLF) based control technique and Learning based Perturb and Observe (LPO) maximum power point tracking (MPPT) algorithm, for optimal control of grid-tied solar photovoltaic (PV) system. Here, a novel LLMLF algorithm is developed for active component extraction from load current, and a novel LPO MPPT algorithm is developed for optimal MPPT operation. Proposed LPO is the improved form of Perturb and Observe (P&O) algorithm, where inherent problems of traditional P&O algorithm like steady-state oscillation, slow dynamic responses and fixed step size issues, are successfully mitigated. The prime objective of proposed LLMLF control is to, fulfill the active power requirement of the loads from generated solar PV power, and excess power is fed to the grid. However, when generated PV power is less than the required load power, then LLMLF fulfills the load by taking extra required power from the grid. During this process, power quality is improved at the grid. The controller action provides reactive power compensation, power factor correction, harmonics filtering and mitigation of other power quality issues. Moreover, when the solar irradiation is zero, than the DC link capacitor and VSC act as DSTATCOM (Distribution Static Compensator), which enhances the utilization factor of the system. The proposed techniques are modeled and their performances are verified experimentally on a developed prototype, in solar insolation variation condition, imbalance loading condition for linear/nonlinear loads, as well as in different grid disturbances such as over-voltage, under-voltage, phase imbalance, harmonics distortion in the grid voltage etc, where it has shown a very good performance.
关键词： Leaky Least Mean Logarithmic Fourth Control,Solar PV array,Grid Integrated,Power Quality,DSTATCOM
更新于2025-09-23 15:22:29
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Optimal allocation of DSTATCOM considering the uncertainty of photovoltaic systems
摘要： Rational allocation of the distribution static compensator (DSTATCOM) can effectively solve the impact of high penetration of photovoltaic (PV) systems on an active distribution network. Taking the intermittent output of a PV system into consideration, this paper establishes an optimal allocation model of DSTATCOM, in which active power loss, voltage deviation, and total allocation cost are considered as the objective functions. Monte Carlo simulation (MCS) is employed to simulate the random output of PV. Moreover, an opportunity constraint is introduced into the optimal model to evaluate the reliability of the allocation scheme. Multiobjective differential evolution gray wolf optimization (MODEGWO) is proposed to determine the optimal location and capacity of the DSTATCOM. A new optimization method integrating MCS, opportunity constraint, and MODEGWO is proposed to deal with the optimal allocation model of DSTATCOM. The proposed method is validated on an IEEE 33-bus system. Simulation results con?rm the rationality and validity of the proposed model.
关键词： Monte Carlo simulation,opportunity constraint,optimal con?guration,MODEGWO,DSTATCOM
更新于2025-09-19 17:13:59
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Robust EnKF with Improved RCGA based Control for Solar Energy Conversion Systems
摘要： The robust ensemble Kalman filter (EnKF) based control is proposed for multifunctional three phase grid-connected solar energy conversion system with distribution static compensator (DSTATCOM) abilities. The robust EnKF based control facilitates the various functionalities of power quality (PQ) enhancement of the distribution grid such as grid currents balancing, harmonics current mitigation and unity power factor. The improved real coded genetic algorithm (RCGA) based metaheuristic approach is used to tune the proportional integral (PI) controller of the DC link voltage. Simulation results comparative dynamic performance, which demonstrates that the robust EnKF exhibits superior response as compared to state of the art techniques. The relative computational complexity of the proposed robust EnKF algorithm is analyzed with conventional stochastic filters such as Kalman filter (KF) and extended Kalman filter (EKF). To substantiate the proposed control, a prototype is realised in the laboratory and test results demonstrate satisfactory response of the grid-connected system subjected to various dynamic scenarios such as load currents imbalancing, harmonics compensation, imbalanced grid voltages, under voltage and over voltage. The response of grid currents are achieved within the IEEE-519, 1564 and 1159 standards.
关键词： DSTATCOM,MPPT,Power Quality,Harmonics,VSC,EnKF
更新于2025-09-04 15:30:14