基于PQ控制策略的光伏电源对电网电压的影响及改善

Impact and improvement of photovoltaic power on grid voltage based on PQ control strategy

分布式光伏发电接入配电网会对系统节点电压产生诸多影响。文章分析了分布式光伏电源接入配电网的PQ(有功/无功功率)控制原理,建立了分布式光伏电源接入配电网典型低压配电线路的模型。对于同一输电线路,先从理论上分析了分布式光伏接入对配电网网络负荷各点电压的影响,然后在Matlab/Simulink环境下验证了理论的正确性。文章详细研究了分布式光伏电源以不同容量接入和在不同位置接入对配电网的影响,并且针对分布式光伏电源接入配电网带来的电能质量问题给出了解决措施和对策。

The access of distributed PVs to distribution network has various impact on its voltage of each point. This paper analyzes the PQ（ active and reactive power） control principles of distributed PVs integrated into distribution network and establishes the model of typical low-voltage distribution lines with PVs integration. For the same transmission line,firstly,the impact on load voltage of each point with PVs access to distribution network has been analyzed,and then,the correctness of the theory has been verified based on Matlab / Simulink. This paper studies the impact on distribution network with different outputs and different locations of PVs in detail,and then gives the measures and countermeasures of power quality that PVs integrated into grid has brought.