一种基于相分量的VSC-HVDC机电暂态仿真方法

A Transient Simulation Method of VSC-HVDC Based on Phase Components

提出一种基于相分量的直流系统机电暂态仿真模型。首先基于相分量对VSC-HVDC一次侧和控制系统进行建模,简化了换流器系统动态方程与电网代数方程之间的数据交换和接口。其次,通过对相分量引入移相环节,简化了锁相环节,实现了实轴和虚轴的解耦控制;接着,根据机电暂态仿真的特点以及VSC外环、内环截止频率与开关频率间的关系,简化了电流内环控制,建立了VSC换流器的机电暂态仿真模型。最后,以电磁暂态仿真结果作为参考值,验证了本文方法的正确性和有效性。

This paper proposes an electromechanical transient simulation model of DC system based on phase components.Firstly,we model the VSC-HVDC primary side and control system based on phase components.And we simplify the data exchange and interface between the dynamic equation of converter system and the algebraic equation of power network.Secondly,by introducing phase shift to phase components,we simplify the phase lock and realize the decoupling control of real axis and virtual axis.Next,according to the characteristics of electromechanical transient simulation and the relationship between the cut-off frequency of VSC outer ring and inner ring and switching frequency of converter,we simplify current inner ring control system and establish the electromechanical transient simulation model of VSC converter.Finally,the proposed method is proved correct and effective by the simulation results of electromagnetic transient state.