摘要
光伏出力的交替性、波动性、不可控性导致配电网三相电压不对称,容易导致配电网电压暂降故障。为改善配电网电能质量,提出基于分序虚拟同步发电机技术的光伏逆变器电压暂降自适应补偿控制策略。分析配电网电压暂降故障对光伏发电并网点的影响特性,建立正、负序功率控制的虚拟同步发电机模型,并提出负序无功功率对故障电压的自适应电压补偿策略,实现虚拟同步发电机对负序功率的控制。所提控制策略易于实现,可适用于不同暂降情况下的电压补偿。最后,通过Matlab/Simulink仿真表明,所提控制算法提高了配电网并网点电压稳定性,验证了该方法的有效性。
The alternating,volatility and uncontrollability of photovoltaic output leads to the asymmetry of three-phase voltage in distribution network,which tending to bring about the voltage sag of distribution network.In order to improve the power quality of distribution network,it proposes a strategy for controlling the voltage sag adaptive compensation of photovoltaic inverter based on the positive and negative sequence virtual synchronous generator technology.It analyzes the influence of voltage sag fault in distribution network on photovoltaic power grid to establish the virtual synchronous generator model of positive and negative sequence power control.It proposes the adaptive voltage compensation strategy of negative sequence reactive power to fault voltage to realize the control of negative sequence power by virtual synchronous generator.It is easy to implement the proposed control strategy and to apply it voltaging compensation under different sags.Finally,the Matlab/Simulink simulation shows that the proposed control algorithm improves the voltage stability of the distribution network and verifies the effectiveness of the method.
作者
高菲菲
杨俊友
董鹤楠
王海鑫
王硕玉
GAO Feifei;YANG Junyou;DONG Henan;WANG Haixin;WANG Shuoyu(School of Electrical Engineering,Shenyang University of Technology,Shenyang,Liaoning 110870,China;Electric Power Research Institute of State Grid Liaoning Electric Power Co.,Ltd.,Shenyang,Liaoning 110006,China)
出处
《东北电力技术》
2020年第6期5-10,共6页
Northeast Electric Power Technology
基金
国家电网有限公司科技项目(SGTYHT17JS199)。
关键词
电压暂降
配电网电压质量
虚拟同步技术
负序功率控制
voltage sag
distribution network voltage quality
virtual synchronization technology
negative sequence power control
