单点集中型光伏发电接入的网压平抑研究及应用

Grid Voltage Stabilization with Single-Node Centralized PV Power Access

通过分布式光伏发电集中一点接入型系统对电网线路电压的影响分析及仿真,研究了光伏线路电压与接入点距离、线路参数、光伏发电及负荷存在的直接关系,通过控制光伏并网逆变器有功无功的大小和方向可以对并网接入点电压进行调节,最终实现对系统线路电压的控制。通过有功无功电压调节控制装置实现了对区域分布式光伏发电系统电压控制,提出了分布式光伏发电系统设计接入点的选择及电压控制的方法。进而有效提高电能质量,减少功率损耗,节省补偿设备的额外投资。

Based on the analysis and simulation of the impacts on grid voltage caused by the distributed PV power generation with single-node centralized access,this paper explores into the immediate relationship of PV line voltage with the access node distanc,circuit parameters,PV power generation and load. The grid access node voltage can be adjusted by controlling the magnitude and direction of the active and reactive power of the PV grid connected inverter, finally realizing the system voltage control. The active and reactive voltage regulator is employed to realize the voltage control of regional distributed PV system. The methods for selecting the access node and controlling voltage of the distributed PV system are proposed with a view to improving power quality,reducing power consumption,and saving additional cost on compensation equipments.