柔性直流控制系统链路延时测量方法研究

Research on Measurement Method of Link Delay in VSC-HVDC Control System

柔性直流控制系统的链路延时对系统动态响应和故障穿越有着较大影响,因此准确测量控制系统的链路延时具有重要意义。通过分析柔性直流控制系统的下行链路延时环节,明确了控制系统下行链路延时的定义,选取模拟量信号的过零点作为特征信号,将控制系统作为整体被测对象接入第三方装置。基于柔性直流仿真控制系统提出了一种准确客观、操作方便并且对控制系统无扰的下行链路延时测量方法,为控制系统的性能评估以及改进提供了参考依据。

The link delay of VSC-HVDC control system has a great impact on the dynamic response and fault ride-through of the system.It is of great significance to accurately measure link delay in VSC-HVDC control system.This paper analyzes the down-link delay of the VSC-HVDC control system to define the downlink delay of the control system.The zero crossing point of the analog signal is selected as the characteristic signal,and the control system is connected to the third-party device as a whole measured object.Based on VSC-HVDC control system,this paper presents an accurate,objective,convenient and undisturbed method for measuring the down-link delay to provide a reference for performance evaluation and improvement of the control system.