不对称故障下的IIDG改进功率控制策略  

Improved Power Control Strategy for IIDG under Asymmetric Faults

作　　者：李智轩 何晋[1] 李维希 孙琮岳 LI Zhixuan;HE Jin;LI Weixi;SUN Congyue(School of Electrical and Information Technology,Yunnan Minzu University,Kunming 650031,China)

机构地区：[1]云南民族大学电气信息工程学院,昆明650031

出　　处：《电力系统及其自动化学报》2022年第3期83-90,99,共9页Proceedings of the CSU-EPSA

基　　金：国家自然科学基金资助项目(52061042);云南省教育厅科学研究基金资助项目(2021Y654)。

摘　　要：针对采用传统正序无功功率注入控制策略的逆变型分布式电源IIDG(inverter-interfaced distributed generation)在电网发生不对称故障时无法有效支撑IIDG公共耦合点PCC(point of common coupling)电压的问题,提出一种改进功率控制策略。首先以预设相电压幅值为约束条件,通过无功功率控制计算得出实现电压支撑所需正负序无功功率参考值。其次,由有功输出振荡抑制控制环节对无功功率控制环节所得的负序无功功率参考值进行二次修正。最后由有功功率控制环节得出实现最大有功功率输出的正序有功功率参考值。仿真算例表明,该控制策略可有效控制IIDG实现故障穿越运行。Under the conventional positive-sequence reactive power injection control strategy,the inverter-interfaced distributed generation(IIDG)cannot effectively support the voltage at the point of common coupling(PCC)when asymmetric faults occur in power grid.To solve this problem,an improved power control strategy is proposed.First,the preset phase voltage amplitude is used as the constraint condition,and the positive-and negative-sequence reactive power reference values required to realize voltage support are calculated through reactive power control.Second,the negativesequence reactive power reference value obtained by the reactive power control is corrected twice by the active output oscillation suppression control.Finally,the active power control obtains the positive-sequence active power reference value that realizes the maximum active power output.The simulation results of an example show that this control strategy can effectively control IIDG to realize the operation of fault ride-through.

关 键 词：不对称故障 电压支撑 逆变型分布式电源 无功功率控制 有功功率控制 有功振荡抑制控制 

分 类 号：TM7[电气工程—电力系统及自动化]