提出了一种新的、非行波原理的高压直流输电(high voltage directcurrent,HVDC)线路单端故障测距方法,该方法建立在分布参数模型基础上,利用单端电压电流量计算沿线电压、电流分布,根据计算得到的沿线电压分布和沿线电流分布求取过渡电...提出了一种新的、非行波原理的高压直流输电(high voltage directcurrent,HVDC)线路单端故障测距方法,该方法建立在分布参数模型基础上,利用单端电压电流量计算沿线电压、电流分布,根据计算得到的沿线电压分布和沿线电流分布求取过渡电阻的阻值,并根据故障点处过渡电阻值的方差最小进行故障定位。该定位方法在时域中进行,所需数据窗短,对采样频率要求不高,计算简单,定位精度高。仿真结果表明,该方法可以实现直流输电线路全线范围内的快速准确的故障定位。展开更多
This paper investigates a control and protection strategy for a four-terminal modular multilevel converter(MMC)based high-voltage direct current(HVDC)system under a converter-side AC fault.Based on the system operatin...This paper investigates a control and protection strategy for a four-terminal modular multilevel converter(MMC)based high-voltage direct current(HVDC)system under a converter-side AC fault.Based on the system operating condition,a control and protection strategy against the fault with normal blocking of the converter is proposed.In practical,applications encountering such a fault,the MMC at the fault side may experience different conditions of blocking failure.The blocking failures may occur on:①the whole converter;②one converter arm;③one sub-module(SM)/several SMs of one converter arm;④other conditions.The phenomenon of the multi-terminal HVDC(MTDC)system following the fault is analyzed under the first three conditions with real-time simulations using the real-time digital simulator(RTDS).Based on the impact of different conditions on the MTDC system,the necessity of utilizing special control and protection is discussed.A special control and protection strategy is proposed for emergency conditions,and its effectiveness is verified by real-time simulation results.展开更多
文摘提出了一种新的、非行波原理的高压直流输电(high voltage directcurrent,HVDC)线路单端故障测距方法,该方法建立在分布参数模型基础上,利用单端电压电流量计算沿线电压、电流分布,根据计算得到的沿线电压分布和沿线电流分布求取过渡电阻的阻值,并根据故障点处过渡电阻值的方差最小进行故障定位。该定位方法在时域中进行,所需数据窗短,对采样频率要求不高,计算简单,定位精度高。仿真结果表明,该方法可以实现直流输电线路全线范围内的快速准确的故障定位。
基金This work is supported by UK EPSRC and UK National Grid.
文摘This paper investigates a control and protection strategy for a four-terminal modular multilevel converter(MMC)based high-voltage direct current(HVDC)system under a converter-side AC fault.Based on the system operating condition,a control and protection strategy against the fault with normal blocking of the converter is proposed.In practical,applications encountering such a fault,the MMC at the fault side may experience different conditions of blocking failure.The blocking failures may occur on:①the whole converter;②one converter arm;③one sub-module(SM)/several SMs of one converter arm;④other conditions.The phenomenon of the multi-terminal HVDC(MTDC)system following the fault is analyzed under the first three conditions with real-time simulations using the real-time digital simulator(RTDS).Based on the impact of different conditions on the MTDC system,the necessity of utilizing special control and protection is discussed.A special control and protection strategy is proposed for emergency conditions,and its effectiveness is verified by real-time simulation results.
