PSD-BPA暂态稳定程序中的新直流输电准稳态模型

New Quasi-Steady-State HVDC Models for PSD-BPA Power System Transient Stability Simulation Program

为适应大量直流输电工程投产的需要,为电网运行和规划设计等部门提供准确的分析研究手段,对暂态稳定程序中的两端直流输电模型进行深入研究,改进了直流输电系统的模拟方法。在国内广泛应用的PSD-BPA暂态稳定程序中增加一组新的直流输电控制系统模型。新模型中的定电流、定熄弧角、定电压等控制采用参数和特性易于调节的比例积分模块,电流定值计算、低压限流、逆变侧换相失败等主要环节的模拟与实际系统特性更为相近。仿真结果表明,与国内程序原有的直流输电模型相比,新模型能更准确地模拟直流输电系统的动态行为,提高暂态稳定仿真的准确度。

To meet the increasing demands of HVDC power transmission projects being put into operation and offer accurate dynamic analysis and research manners to operation, design and planning departments of power grids, the two terminal HVDC power transmission models of transient stability simulation programs are researched in depth and a group of new control system models, namely the quasi-steady-state （QSS） HVDC models, for power system transient stability simulation are proposed and added into the PSD-BPA transient stability analysis program that is widely used in China, thus the simulation ways for HVDC power transmission system are improved. In QSS models the proportional-integral modules, which are conveniently to be controlled, are adopted for the control of constant current, constant extinction angle and constant voltage, and the simulation results of main elements, such as current setting, voltage dependent current order limit （VDCOL） and commutation failure at DC inverter side and so on, are more close to the characteristics of actual system. Simulation results show that comparing with HVDC power transmission models originally existing in domestic programs, new QSS models can simulate dynamic behavior of HVDC power transmission systems and the accuracy of transient stability simulation results is improved.