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
提出了基于实时数字仿真器(real time digital simulator,RTDS)的电磁–机电暂态混合实时仿真方法。在RTDS/CBuilder环境下,采用多线程和双链表稀疏矩阵技术开发了实时机电暂态仿真程序。提出了电磁和机电侧接口等值电路模型,并将RTDS...提出了基于实时数字仿真器(real time digital simulator,RTDS)的电磁–机电暂态混合实时仿真方法。在RTDS/CBuilder环境下,采用多线程和双链表稀疏矩阵技术开发了实时机电暂态仿真程序。提出了电磁和机电侧接口等值电路模型,并将RTDS电磁模型与实时机电暂态程序进行了连接,建立了混合实时仿真平台。该平台可以在详细分析含直流输电局部电网的同时,又能较准确地考虑交流系统对暂态稳定的影响。仿真算例证明了所提混合实时仿真方法的正确性。展开更多
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.
文摘提出了基于实时数字仿真器(real time digital simulator,RTDS)的电磁–机电暂态混合实时仿真方法。在RTDS/CBuilder环境下,采用多线程和双链表稀疏矩阵技术开发了实时机电暂态仿真程序。提出了电磁和机电侧接口等值电路模型,并将RTDS电磁模型与实时机电暂态程序进行了连接,建立了混合实时仿真平台。该平台可以在详细分析含直流输电局部电网的同时,又能较准确地考虑交流系统对暂态稳定的影响。仿真算例证明了所提混合实时仿真方法的正确性。
