分布式发电接入余杭电网的电压稳定及准入容量分析

Analysis on Allowed Penetration Level and Voltage Stability of Distributed Generations in Yuhang Power Grid

分布式发电(distributed generation,DG)接入容量、采用的控制方式都将对电压稳定产生显著影响。针对DG接入余杭电网,推导DG接入点电压关于渗透率的解析式,据此分析不同DG渗透率下的静态电压稳定特性和负荷PV特性。比较DG采用不同无功控制策略对静态电压稳定特性的影响,并对不同渗透率下DG接入余杭电网的暂态电压稳定性进行分析。结合静态和暂态电压稳定校验,确定余杭电网中允许DG接入的极限渗透率。分析结果表明,适当地增加分布式发电的穿透功率可提高系统承受负荷的能力。

Both the integration capacity of distributed generation (DG) and the control methods could affect voltage stability significantly. Aimed at DG integrated to Yuhang power grid, the analytic expression of load voltage in regard to the penetration of DG was derived, and on the basis, the static voltage stability and the PV characteristics were analyzed under different DG penetrations. Then the impact of the different reactive power control strategies on static voltage stability was compared, and the transient voltage stability of DG penetration on Yuhang power grid was analyzed. At last, the maximum allowed capacity of DG integrated to Yuhang power grid was determined with the combination of static and transient voltage stability checking. The study result shows that the system can support more load when the penetration of DG is increased appropriately.