石榴石型光学电流传感器在高压直流输电差动保护中的应用

Application of garnet optical current sensor in HVDC differential protection

针对高压直流输电传输网络中电压源转换器多端高压故障问题,提出了一种基于石榴石型光学电流传感器多分布点式快速检测定位故障的方法。利用光学电流传感器测量分布各传输线的电流,运用差动保护的原理,检测各线路的运行情况,从而判断线路的故障。通过MATLAB搭建仿真模型,利用集成感应式直流线路终端、直流断路器模型和光纤电流传感器网络对高压直流输电瞬态运行仿真。仿真结果表明,提出的故障检测方法能够有效地在极短的时间内检测多端子直流输电网发生的故障,为高压直流输电安全有效地接入输电网络提供了科学依据。

For the problem of muhi-terminal high-voltage fault occurred in the voltage-source converter in HVDC transmission network, a method of rapid fault detection and location based on multi- distributed point of the garnet optical current sensor is proposed. The optical current sensor is used to measure the current distribution of the transmission line and the differential protection principle is used to detect the operating condition of the line to determine the line failure. And then in MATLAB, a simulation model is set up. The integrated induction DC line terminal, DC circuit breaker model and fiber current sensor network are integrated to simulate the HVDC transient operation. The simulation results show that the proposed fault detection method can effectively detect the failure of multi-terminal direct current （MTDC） transmission network with speed, which provides a scientific basis for the access of HVDC to the transmission network safely and effectively.