UHVDC高端换流变阀侧电压PCOV的一种数字仿真模型

高端换流变阀侧电压的持续运行最大峰值（peak value of the continuous operating voltage，PCOV）是特高压直流换流站直流避雷器参数设计和绝缘配合方案评估的一个重要数据。利用RTDS的非实时运算功能，本着尊重实际工程事实的原则及突出关键点、保留关联点和等效次要点的基本方式，通过采用自定义阀元件模型、低端换流器等效为可调直流源、控制系统依运行特性最简化等建模技术，建立了一种能够模拟换相过冲暂态过程、计算高端换流变阀侧电压PCOV的数字仿真高频模型，并且以向家坝-上海SymbolqB@800 kV直流输电工程为实例，从不同运行工况和不同设备参数的角度对模型准确性和可用性进行了分析和验证。

A PCOV Digital Simulation Model of HV Transformer Valve Side Voltage in UHVDC System

The peak value of continuous operating voltage (PCOV) of HV transformer valve side voltage is an important data for the design of DC arrester parameters and the evaluation of insulation coordination scheme in UHVDC converter stations. Utilizing non real time operation functions of RTDS (real time digital simulator), in respect of the principle of the actual engineering facts, as well as to highlighting the key points, retain the related points and get equivalent of no significant points, this paper established a digital simulation high-frequency model which could simulate commutation overshoot transient process and calculate the PCOV of HV transformer valve side voltage with using multiple modeling techniques such as user-define valve component, adjustable DC voltage source equivalent for LV converter, the most simplification for control system according to the operating characteristics and so on. Taking Xiangjiaba-Shanghai ±800 kV UHVDC transmission project as an example, the accuracy and availability of the model were analyzed and verified from aspects of different operating conditions and equipment parameters.