摘要
文中运用一种新的建模方法——基于时变傅立叶级数的动态相量(Dynamic phasors)法对HVDC进行建模和仿真。该方法通过保留系统状态变量对应的时变傅立叶级数中重要的项而对原系统进行简化,在建模过程中,用开关函数来表示阀的开关状态,换流桥每个桥臂都有3个不同状态,用它们的状态分段组合可以表示整个换流桥的状态,从而可以考虑直流换流桥的换相过程。最后通过简单的算例,将动态相量模型和详细电磁暂态(EMT)模型仿真计算结果相比较,证明HVDC的动态相量模型是精确而有效的,不仅可准确地描述HVDC在给定扰动下暂态变化过程,而且可节省计算时间。
A newly developed method-dynamic phasors method is presented in this paper and applied to model HVDC converters This approach is based on the time-varying Fourier coefficient series of the system variables, and focused on the dynamics of the Fourier coefficients. By truncating unimportant higher order series and keeping only those significant series, the dynamic phasors model can catch the dynamic behavior of the original detail model of a certain element. In this paper, the analysis is based on a piecewise state representation of the converter through the switching functions, which can consider the commutation periods. Through typical test examples and their simulation results, the effectiveness and accuracy of this method are verified.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2003年第12期28-32,共5页
Proceedings of the CSEE
基金
国家重点基础研究专项经费项目(G1998020305)
香港政府大学研究基金(CityU 1/00C)~~
