摘要
送端系统故障下整流器有功无功交互耦合会导致暂态过电压。针对此问题,首先,明确了直流功率、整流器无功消耗量的主导因素,深入剖析了送端故障引发的换相失败(commutation failure,CF)后整流器无功消耗量、直流功率的耦合规律,得出直流电流上升阶段二者呈负相关,直流电流下降阶段二者呈正相关的结论。其次,分析了故障恢复期间暂态电压幅值的影响因素,阐明了不同故障严重程度下考虑有功无功交互耦合的暂态过电压机理。然后,建立了送端系统有功不平衡量、整流器无功消耗量与直流电流的数学关系。基于无功功率与母线电压的数学关系以及有功无功交互耦合规律,提出一种考虑有功支撑的暂态过电压控制策略。最后,基于PSCAD/EMTDC的仿真结果验证了理论分析的正确性以及所提控制策略的有效性。
There is a transient overvoltage problem caused by the active and reactive power interaction coupling of the rectifier when a fault occurs in the sending end AC system.First,the main influencing factors for DC power and reactive power consumed by the rectifier are clarified,and the coupling relationship between reactive power consumption and DC power of the rectifier after commutation failure(CF)caused by a sending end AC system fault is analyzed.It is concluded that the relationship between reactive power and DC power is negatively correlated during the rising stage of DC current,and the relationship is positively correlated during the falling stage.Secondly,the influencing factors of the transient voltage amplitude during the fault recovery period are analyzed,and the transient overvoltage mechanism considering the interaction coupling of active and reactive power under different fault severity is clarified.Then,the mathematical relationship among the unbalanced active power of the sending end system,the reactive power consumed by the rectifier and the DC current is established.Based on the mathematical relationship between the reactive power and the bus voltage,and considering the interaction coupling relationship between active and reactive power,a transient overvoltage control strategy considering the active power support is proposed.Finally,the simulation results based on PSCAD/EMTDC verify the accuracy of the theoretical analysis and the effectiveness of the proposed control strategy.
作者
史映萍
尹纯亚
李凤婷
韩璐
刘江山
张雨乐
SHI Yingping;YIN Chunya;LI Fengting;HAN Lu;LIU Jiangshan;ZHANG Yule(College of Electrical Engineering,Xinjiang University,Urumqi 830017,China)
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2024年第21期117-128,共12页
Power System Protection and Control
基金
国家自然科学基金项目资助(5236070148)。
作者简介
史映萍(2000-),女,硕士研究生,主要研究方向为交直流系统稳定与控制,E-mail:107552201512@stu.xju.edu.cn;通信作者:尹纯亚(1994-),男,博士,副教授,主要研究方向为交直流系统稳定与控制。E-mail:1399132297@qq.com。
