单相VSC系统宽频阻抗测量装置保护方案研究

Research on Protection Scheme of Broadband Impedance Measurement Device for Single-phase VSC System

宽频阻抗测量装置在获取单相VSC系统的阻抗特性中发挥着重要作用,由于阻抗测量装置需要接入系统进行能量交换,其自身应当具备合理的故障保护措施来保障装置和系统的运行安全。针对单相VSC系统阻抗测量装置的故障保护策略尚不完善,提出了一种单相VSC系统阻抗测量装置的故障保护方案。首先,选择了基于背靠背变流器结构的阻抗测量装置来研究保护策略;其次,分析了背靠背阻抗测量装置的特点及其对保护配置产生的影响,设计了适用于装置的保护方案;最后,基于Matlab/Simulink平台,通过几种典型的短路故障情形验证了所提出装置保护方案的可行性与有效性。

Broadband impedance measurement devices play an important role in obtaining the impedance characteristics of single-phase VSC systems,because impedance measurement devices need to be connected to the system for energy exchange,they should have reasonable fault protection measures to ensure the operation safety of devices and systems.However,the fault protection strategy for impedance measurement devices in single-phase VSC systems is not perfect.A fault protection scheme for impedance measurement devices in single-phase VSC systems is proposed.Firstly,the impedance measurement device based on back-to-back converter structure is selected to study the protection strategy.And then,the characteristics of impedance measurement device and its influence on the protection configuration are analyzed,and a comprehensive protection scheme is designed.Finally,based on Matlab/Simulink platform,the feasibility and effectiveness of the proposed device protection scheme are verified by several typical short-circuit fault scenarios.