含特高压直流的多馈入直流电网RTDS建模

Modeling of Multi-Infeed DC Grid Including UHVDC Based on RTDS

为探索在实时数字仿真器(real time digital simulator,RTDS)下的多馈入直流电网建模方法,搭建了以2012年丰大方式BPA软件等值数据为基础、含±800 kV特高压直流的南方电网等值系统模型。介绍了实验仿真平台的硬件配置及功能,给出了RTDS系统模型搭建的基本步骤及电力系统元件模型的选择原则。利用单机无穷大系统短路实验得到发电机的动态响应曲线,比对检验了各台发电机控制系统模型的正确性。在此基础上,通过与BPA稳态运行时各状态量比较以及典型的交流故障和直流故障的仿真结果比较,验证了所建电网模型的有效性和正确性。最后,详细分析了RTDS与BPA仿真结果存在偏差的原因,并比较了两者在仿真计算中的优劣性。

In order to explore the multi-infeed DC modeling method in real time digital simulator （RTDS） platform, an equivalent system model like China Southern Power Grid was built including ± 800 kV UHV DC transmission grid, based on the equivalent data of BPA with high load level case of China Southern Power Grid （CSG） in 2012. The hardware configuration and function of the experimental simulation platform were introduced, of which the basic steps of RTDS system modeling were presented, as well as the selection principle of element model in power system were introduced. The validity of generator control system models was proved by the dynamic response curve of generator in short circuit experiment of single machine-infinity bus power system. On this basis, through the comparison with each state variable during BPA steady- state operation, and the simulation results of typical AC faults and DC faults, the effectiveness and correctness of the proposed simulation models for power grid were verified. Finally, the error reasons of RTDS and BPA were analyzed in detail, as well as the superiority-inferiority of these two simulation softwares in simulation calculation was compared.