基于实际工程的直流输电控制系统仿真模型

Simulation Model of Control System for HVDC Power Transmission Based on Actual Project

分析了直流输电控制系统仿真计算模型的发展现状,提出了一套基于实际工程控制器的直流控制系统仿真模型。介绍了模型的基本结构、控制特性及对实际控制器的主要简化。模型包含主控制、极控制、触发控制3个主要部分,分析了各个控制模块的原理与实现方法,包括主控制、电流控制、熄弧角控制、触发控制等。其中触发控制部分实现了直流工程所采用的等相位间隔触发方法,并能够考虑提前触发机制,以预防换相失败。针对实际直流控制器的分层计算方式,提出了采用统一步长计算的补偿措施。仿真结果与若干直流工程系统现场调试的录波曲线进行了对比,分析提前触发对模型仿真结果的影响,验证了模型的准确性。

After the analysis on present situation of simulation model of control system for HVDC power transmission,a simulation model for DC control system based on the controller of actual HVDC transmission project is proposed,and the basic structure,control characteristics of the proposed model and the main simplification of actual controller are presented.The proposed model contains three major proportions,namely the master control,the pole control and the firing control.The principle and implementation of each control module such as mian control,current control,extinction angle control,firing control and so on are analyzed.The firing control based on evenly spacing in phase,which is adopted by actual HVDC transmission project,is implemented in the firing control and the advanced firing is considered to prevent commutation failure.To replace the layered calculation utilized in actual DC controllers,a compensation measure based on uniform step length calculation is put forward and used in the proposed model.To analyze the influence of advanced firing on the proposed control model,simulation results of the proposed control model are compared with recorded field commissioning curves of several HVDC transmission projects,and comparison results show that the accuracy of the proposed control model is satisfied.