摘要
随着中国特高压直流输电技术的广泛应用,多馈入高压直流集中落入受端负荷中心将是未来我国电网发展所面临的重要问题。特高压直流分层接入方式有助于提高多馈入直流系统电压支撑能力,已经列入国家电网规划。传统的逆变侧最大触发延迟角控制策略在逆变侧一个交流电网发生故障时会导致另一正常运行交流电网所连接阀组发生换相失败。该文提出一种改进的逆变侧最大触发延迟角控制策略:逆变侧一个交流电网发生故障时,控制另一个正常运行交流电网连接的阀组不以提升直流电压来抑制直流电流为控制目标,而以减小最大触发延迟角不发生换相失败为控制目标,可保证无故障交流电网所连接的阀组正常运行,避免了直流功率振荡。
With the development and widespread use of ultra high-voltage direct current（UHVDC） transmission technology, the multi-infeed HVDC system in load center of China will be the prominent problem in the development of China power grid. UHVDC with hierarchical connection can improve the alternating voltage support capacity in the multi-infeed HVDC system and has been included in the national power grid planning. When an alternate current（AC） grid has a fault, the converter connected to the other normal AC grid in the inverter, which is controlled by the conventional inverter maximum alpha control, will fail to commutate. In this paper, an improved inverter maximum alpha control was proposed. When an AC grid has a fault, the converter connected to the other normal AC grid is not to increase the direct voltage to reduce the direct current, but to decrease alpha to avoid commutation failure. The converter can commutate normally, and avoid the oscillation of the DC power.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2016年第7期1808-1816,共9页
Proceedings of the CSEE
基金
国家电网公司总部科技项目(±800 kV特高压直流容量提升到10 000 MW接入500/1 000 kV交流电网关键技术研究)
关键词
特高压直流输电
分层接入方式
逆变侧最大触发延迟角控制
定?角控制
晶闸管
ultra high-voltage direct current(UHVDC)transmission
hierarchical connection mode
inverter maximum alpha control
constantγcontrol
thyristor
作者简介
卢东斌(1982),男,博士,研究方向为高压直流输电控制、电动汽车电驱动系统控制,ludongbin@nrec.com;王永平(1978),男,高级工程师,研究方向为高压直流输电控制;王振曦(1978),男,高级工程师,研究方向为高压直流输电控制;曹冬明(1972),男,研究员级高级工程师,研究方向为高压直流输电控制。
