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Improved particle swarm optimization for photovoltaic system connected to the grid with low voltage ride through capability

机译：改进的粒子群算法优化了光伏系统与电网的低压穿越能力

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摘要

Grid connected photovoltaic (PV) system encounters different types of abnormalities during grid faults; the grid side inverter is subjected to three serious problems which are excessive DC link voltage, high AC currents and loss of grid-voltage synchronization. This high DC link voltage may damage the inverter. Also, the voltage sags will force the PV system to be disconnected from the grid according to grid code. This paper presents a novel control strategy of the two-stage three-phase PV system to improve the Low-Voltage Ride-Through (LVRT) capability according to the grid connection requirement. The non-linear control technique using Improved Particle Swarm Optimization (IPSO) of a PV system connected to the grid through an isolated high frequency DC DC full bridge converter and a three-phase three level neutral point clamped DC-AC converter (3LNPC(2)) with output power control under severe faults of grid voltage. The paper, also discusses the transient behavior and the performance limit for LVRT by using a DC-Chopper circuit. The model has been implemented in MATLAB/SIMULINK The proposed control succeeded to track MPP, achieved LVRT requirements and improving the quality of DC link voltage. The paper shows superiority of IPSO than Incremental Conductance (IC) method during MPPT mode of PV system. (C) 2015 Elsevier Ltd. All rights reserved.
机译：并网光伏系统在电网故障期间会遇到不同类型的异常。电网侧逆变器面临三个严重问题，即直流母线电压过高，交流电流高以及电网电压同步丢失。高直流母线电压可能会损坏逆变器。同样，电压骤降将迫使光伏系统根据电网规范从电网断开。本文提出了一种新型的两阶段三相光伏系统控制策略，以根据电网连接要求提高低压穿越（LVRT）能力。使用通过隔离的高频DC DC全桥转换器和三相三电平中性点钳位DC-AC转换器连接到电网的PV系统的改进粒子群优化（IPSO）的非线性控制技术（3LNPC（2 ））在严重的电网电压故障下具有输出功率控制。本文还讨论了使用DC-Chopper电路的LVRT的瞬态行为和性能极限。该模型已在MATLAB / SIMULINK中实现。所提出的控件成功跟踪了MPP，达到了LVRT要求并提高了直流母线电压的质量。本文显示了在光伏系统的MPPT模式下IPSO优于增量电导（IC）方法。 （C）2015 Elsevier Ltd.保留所有权利。

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