实时闭环仿真系统的交直流过电压研究初探.pdfVIP

实时闭环仿真系统的交直流过电压研究初探 高 鹏 (南瑞继保电气有限公司， 江苏省南京市 211100） Preliminary Discussion on Over-voltage Studies Of Real-time Closed-loop AC/DC Simulation System GAO Peng （Nari-Relays Electric Co Ltd, Nanjing 211100 ） ABSTRACT: Power system over-voltage (OV) studies are 磁饱和特性仿真，因此，需要在换流母线上添加非线性仿真 necessary for developing high-voltage, extra-high voltage and 元件，数学模拟换流变的磁饱和特性。由于实时快速仿真的 ultra-high voltage grids. Though the analysis of some RTDS 需要，RTDS 避雷器模型通过一种特殊的分段仿真方法描述避 models, which are very pivotal for OV studies, a conclusion can 雷器的非线性特征，对模型的参数要求合理配置以增强仿真 be given that RTDS currently can be used to analysis OV level 准确度。 and its control strategies of AC system when disturbs happen, 关键字：系统研究；RTDS ；过电压研究；电磁暂态仿真 such as bipolar DC is blocked and reject its load. The RTDS 中图分类号：TM743; TM761 models of arrestor and magnetizing branch of converter transformer, whose proper simulation are very crucial for the correctness and credibility of OV studies, are introduced. There 1引言 is no magnetizing branch modeled in the HVDC valve group model of RTDS, so some new models should be added and connected to the converter bus to simulate the magnetizing 电力系统计算机仿真是用数学模型代替实际电 saturation characteristics of converter transformer. For real-time 力系统，并基于数值计算方法对系统的运行特性进 and fast simulation, RTDS represents the Non-linear 行试验和研究。通过这些仿真计算来确定系统规划 characteristics of arrestor with a special piece-wise function, and 设计方案、拟定运行方式、进行事故分析、开发保 the parameters of the model should be set properly for a correct 护和自动控制装置等 [1 －3] 。实时数字仿真器 RTDS simulation.