电网故障条件下并网光伏逆变器控制策略研究
摘要:电网故障条件下光伏逆变器的有效控制，对提高光伏发电系统的并网运行能力具有重要意义。首先分析了不同电网故障时并网光伏逆变器的运行特性，进而提出了不同电网故障条件下并网光伏逆变器的控制策略。针对对称故障，采用限制功率的方法来对输出电流进行限制；针对不对称故障，首先对目前研究较为广泛的不对称电压故障条件下光伏逆变器控制方法进行了分析，进而提出了2种考虑电流峰值和有功和无功功率波动的协调控制策略，以拓展逆变器输出有功功率，并对2种协调控制策略进行了对比分析。所提出的控制策略能够保证光伏系统在满足并网要求的前提下实现低电压穿越，通过在PSCAD/EMTDC中建立仿真模型验证了所提出控制策略的正确性。
Abstract：The effective control of photovoltaic inverter under grid faults is very important for the grid-connected operation of the photovoltaic generation system. This paper first analyzes the performance characteristics of grid-connected photovoltaic inverter under different grid faults, and proposes control strategies of grid-connected photovoltaic inverter under different grid faults. Aiming at symmetrical fault, limiting active power to constrain output current is adopted. Aiming at unsymmetrical fault, in order to expand active power, the approaches of PV inverter during unbalanced voltage sag, which are widely being researched at present, are analyzed, and two coordinated control strategies considering peak current and active and reactive power fluctuations are proposed, comparison and analysis of two coordinated control strategies have been made. Using the proposed control strategies, the low voltage ride-through (LVRT) of PV inverter has been realized to meet the requirements of grid code. The simulation models in PSCAD/EMTDC have been established to validate the proposed control strategy.
标题：电网故障条件下并网光伏逆变器控制策略研究
title:Control Strategies of Grid-Connected Photovoltaic Inverter Under Grid Fault Conditions
作者：曹炜,王海华,陆冉
authors:CAO Wei,WANG Haihua,LU Ran
关键词：光伏逆变器,低电压穿越,协调控制策略,电流峰值,功率波动,
keywords:photovoltaic inverter,LVRT,coordinated control strategy,peak current,power fluctuation,
发表日期：2018-03-21
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