摘要
针对锁相环同步的弱连接电压源变流器(weakgrid connected voltage source converter,WG-VSC)系统的暂态稳定问题,该文首先应用线性矩阵不等式优化法构建WG-VSC系统的最大估计吸引域(largest estimated domain of attraction,LEDA),并将LEDA与基于LaSalle不变集定理的能量函数法和平方和规划法构建的LEDA进行详细对比,验证了所提方法在刻画LEDA方面具有更低的保守性。然后从保证故障穿越控制过程中的锁相环暂态同步稳定作为切入点,首次提出WG-VSC系统在电网对称故障大扰动下的有功/无功电流设定值可行域概念,并基于线性矩阵不等式方法刻画的LEDA,提出该可行域的求解算法,分析了典型参数对该电流设定值可行域的影响。该可行域为故障过程中的有功和无功电流设定值提供了切实可行的指导依据。最后在PSCAD/EMTDC中搭建了基于详细开关模型的WG-VSC系统仿真算例,通过多种暂态仿真工况验证了该文所构建的LEDA和电流设定值可行域的有效性和可行性。
This paper mainly focused on transient stability issues of the weak grid connected voltage source converter(WG-VSC)system under phase-locked loop synchronization.Firstly,the linear matrix inequality optimization method was applied to construct the largest estimated domain of attraction(LEDA)of the WG-VSC system.Compared with the LEDA constructed by the energy function method based on the LaSalle invariant principle and the LEDA constructed by the sum-of-square programming method,the proposed method was less conservative in characterizing LEDA.Then,for ensuring the transient stability during the fault ride-through process,the concept of the feasible region of current settings of the WG-VSC system under symmetrical grid faults was proposed.Furthermore,based on the LEDA characterized by the proposed linear matrix inequality optimization method,the solution algorithm of this feasible region was derived.The influence of typical parameters on this feasible region was analyzed.It should be noted that this feasible region can provide practical guidance for the current settings under faults.Finally,a detailed switching model of WG-VSC system based on PSCAD/EMTDC was built.Detailed simulation results have verified the LEDA constructed and the feasible region of current settings.
作者
李霞林
王智
郭力
朱琳
张晨
朱介北
富晓鹏
张野
王成山
LI Xialin;WANG Zhi;GUO Li;ZHU Lin;ZHANG Chen;ZHU Jiebei;FU Xiaopeng;ZHANG Ye;WANG Chengshan(Key Laboratory of Smart Grid of Ministry of Education(Tianjin University),Nankai District,Tianjin 300072,China;State Key Laboratory of HVDC(Electric Power Research Institute,China Southern Power Grid),Guangzhou 510663,Guangdong Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2022年第20期7485-7496,共12页
Proceedings of the CSEE
基金
国家自然科学基金项目(51977142)
国家重点研发计划项目(2020YFB1506803)
中国博士后科学基金面上项目(2021M 692378)。
关键词
最大估计吸引域
锁相环暂态同步稳定
线性矩阵不等式优化法
电流设定值可行域
largest estimated domain of attraction(LEDA)
transient stability of PLL synchronization
the linear matrix inequality(LMI)optimization method
feasible region of current settings
