基于解耦迭代运算的主动配电网短路计算方法
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摘要
针对现有电压源等值法无法用于电流控制IIDG接入电网的故障分析,深入研究电网短路后电流控制IIDG的动态特性及其短路电流解析计算方法,提出了解耦迭代计算方法。所提算法不仅简化了求解过程,而且能准确求取短路电流初始值,为主动配电网的保护整定和故障分析奠定了坚实基础。
In view of the fact that the existing voltage source equivalence method cannot be applied to the fault analysis of current-controlled IIDG connected to power grid,the dynamic characteristics of current-controlled IIDG after short-circuit in power grid and its analytical calculation method of short-circuit current are studied in depth,and a decoupling iterative calculation method is proposed.The proposed algorithm not only simplifies the solving process,but also can accurately calculate the initial value of shor t-circuit current,which lays a solid foundation for protection setting and fault analysis of active distribution network.
In view of the fact that the existing voltage source equivalence method cannot be applied to the fault analysis of current-controlled IIDG connected to power grid,the dynamic characteristics of current-controlled IIDG after short-circuit in power grid and its analytical calculation method of short-circuit current are studied in depth,and a decoupling iterative calculation method is proposed.The proposed algorithm not only simplifies the solving process,but also can accurately calculate the initial value of shor t-circuit current,which lays a solid foundation for protection setting and fault analysis of active distribution network.
引文
[1]Nimpitiwan N,Heydt G T,Ayyanar R,et al.Fault Current Contribution from Synchronous Machine and Inverterbased Distributed Generators[J].IEEE Transactions on Power Delivery,2007,22(1):634-641.
[2]Yazdani A,Iravani R.Voltage-sourced Converters in Power Systems[M].New Jersey:John Wiley and Sons,2010:160-269.
[3]孙景钌,李永丽,李盛伟,等.含逆变型分布式电源配电网自适应电流速断保护[J].电力系统自动化,2009,33(14):71-76.
[2]Yazdani A,Iravani R.Voltage-sourced Converters in Power Systems[M].New Jersey:John Wiley and Sons,2010:160-269.
[3]孙景钌,李永丽,李盛伟,等.含逆变型分布式电源配电网自适应电流速断保护[J].电力系统自动化,2009,33(14):71-76.