电网对称短路故障时分布式电源功率注入对并网点电压的支撑作用  

Supporting Effect of Power Injection From Distributed Generations on Voltage at Grid-Connected Point During Symmetrical Short-Circuit Faults in Power System

作　　者：江玲[1] 刘邦银[1] 段善旭[1] 

机构地区：[1]强电磁工程与新技术国家重点实验室(华中科技大学),湖北省武汉市430074

出　　处：《电网技术》2014年第3期669-674,共6页Power System Technology

基　　金：国家自然科学基金项目(51361130150);国家电网公司科技项目(规模化光伏发电运行控制关键技术研究与示范)~~

摘　　要：根据分布式电源(distributed generation,DG)等效电路模型及相量图,推导了故障时刻分布式电源对并网点电压支撑作用的原理,揭示了电压支撑效果与电网阻抗比及DG渗透率之间的关系。据此,提出了故障时刻根据电网阻抗比分配DG输出有功和无功来支撑并网点电压的方法。仿真算例结果验证了所提方法的有效性。Based on equivalent circuit model of distributed generation （DG） and phasor diagram, the principle of supporting effect of DG on voltage of grid-connection point at the moment of fault occurrence is derived, and the relations among the voltage supporting effect, the R/X ratio of equivalent impedance and the penetration level of DG are revealed. On this basis, a method to inject active and reactive output of DG into power grid according to the R/X ratio of equivalent impedance to support the voltage of grid-connection point at the moment of fault occurrence is proposed. The effectiveness of the proposed method is validated by simulation results.

关 键 词：分布式电源 电网故障 电压支撑 渗透率 

分 类 号：TM721[电气工程—电力系统及自动化]