适用于分层接入的特高压直流输电控制策略  

Control Strategies for UHVDC with Hierarchical Connection Mode

作　　者：王永平[1,2] 卢东斌[1,2] 王振曦[1,2] 邹强[1,2] 张庆武[1,2] WANG Yongping LU Dongbin WANG Zhenxi ZOU Qiang ZHANG Qingwu(NARI Group Corporation （State Grid Electric Power Research Institute）, Nanjing 211106, China NRElectric Co. Ltd., Nanjing211102, China)

机构地区：[1]南瑞集团公司(国网电力科学研究院),江苏省南京市211106 [2]南京南瑞继保电气有限公司,江苏省南京市211102

出　　处：《电力系统自动化》2016年第21期59-65,共7页Automation of Electric Power Systems

摘　　要：随着中国特高压直流的广泛应用,多馈入直流集中落入受端负荷中心将成为未来中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。分层接入的特高压直流输电在电路结构上发生了变化,在阀组电压平衡控制、阀组退出后直流功率控制、逆变侧最大触发延迟角控制和无功功率控制等方面需要研究适用于分层接入的特高压直流控制策略。在阀组电压平衡控制方面,两个阀组各运行在逆变侧最大触发延迟角控制,通过换流变压器分接头来平衡电压;在阀组退出后直流功率控制方面,研究阀组退出后限制的功率分配策略;在逆变侧最大触发延迟角控制方面,大扰动下采用实际电流计算最大触发延迟角;在无功功率控制方面,连接不同交流电网的换流器分别控制各自的无功功率。With the development and widespread application of ultra-high voltage direct current（ UHVDC） transmission technology, the multi-infeed HVDC system in the load centers of China will become a prominent problem in the development of China＇ s power grids.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. The circuit structure has changed for UHVDC with hierarchical connection.Compared to the traditional control strategies, those applied to UHVDC with hierarchical connection mode in voltage balance control,reactive power control, power control for valve exit should be improved. With respect to voltage balance control, the alphamax inverter control（ AMAX） is used in each valve, while the voltage balance control is achieved by the converter transformer tap control. For the reactive power control, the valves connected to AC grid 1 and AC grid 2 control reactive power, respectively. With respect to the power control for valve exit, the limited power allocation strategy is studied.

关 键 词：特高压直流 分层接入 电压平衡控制 无功功率控制 最大触发延迟角控制 

分 类 号：TM721.1[电气工程—电力系统及自动化]