基于混合同步控制的构网型变流器不对称故障下暂态稳定分析  

Transient Stability Analysis of Hybrid-synchronization Control Based Grid-forming Converters Under Asymmetric Faults

作　　者：王龙悦 胡鹏飞[1] 于彦雪 杨锐良 张哲玮 WANG Longyue;HU Pengfei;YU Yanxue;YANG Ruiliang;ZHANG Zhewei(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China;Kunming Power Supply Bureau of Yunnan Power Grid Co.,Ltd.,Kunming 650011,China)

机构地区：[1]浙江大学电气工程学院,浙江省杭州市310027 [2]云南电网有限责任公司昆明供电局,云南省昆明市650011

出　　处：《电力系统自动化》2025年第2期20-29,共10页Automation of Electric Power Systems

基　　金：国家自然科学基金联合基金资助项目(U2166204)。

摘　　要：构网型变流器具有良好的主动支撑特性和弱电网适应能力,已成为目前关注的热点。然而,构网型控制(GFMC)在电网故障下的暂态稳定性能是制约其运行的关键问题,现有成果主要关注对称故障下GFMC策略的暂态同步稳定问题,对于不对称交流故障下的暂态同步稳定特性鲜有深入研究。针对最新的混合同步型构网控制方法,首先,结合正负序解耦模块与混合同步控制结构,使混合同步控制能够应用于不对称故障。其次,建立了不对称故障下系统的详细动态模型,基于此模型,定性分析了正负序电流对暂态稳定的影响规律,并进一步基于相图模型定量解析正负序电流与暂态失稳边界的数学关系。最后,基于电磁暂态数值仿真和硬件在环实验,验证了所提控制策略的有效性和不对称故障下暂态同步稳定性分析的准确性。With good active support characteristics and weak grid adaptability,grid-forming converters have become a hot topic.However,the transient stability performance of grid-forming control(GFMC)under grid faults is a key issue restricting its operation.The existing studies mainly focus on the transient synchronization stability of GFMC strategy under symmetric faults,with limited in-depth studies on transient synchronization stability under asymmetrical AC faults.According to the latest hybridsynchronization based grid-forming control methods,firstly,combining the positive and negative sequence decoupling module and hybrid-synchronization control structure,the hybrid-synchronization control can be applied to asymmetric faults.Secondly,a detailed dynamic model of the system under asymmetric faults is established,based on which the influence of positive and negative sequence current on transient stability is qualitatively analyzed,and the mathematical relationship between positive and negative sequence current and transient instability boundary is quantitatively analyzed based on the phase diagram model.Finally,based on electromagnetic transient numerical simulation and hardware-in-the-loop experiments,the effectiveness of the proposed control strategy and the accuracy of the transient synchronization stability analysis under asymmetric faults are verified.

关 键 词：不对称故障 暂态稳定性 构网型变流器 混合同步控制 相平面法 电流稳定边界 

分 类 号：TM46[电气工程—电器] TM712