风火打捆直流外送系统的直流系统无功补偿装置协调控制策略及配置方案  

Coordinated Control Strategy and Configuration Scheme of RPCD of DC System for Wind-Thermal-Bundled Power Transmission

作　　者：赵云灏 夏懿[2] 周勤勇[3] 宋汶秦[2] 孙玉娇[3] 刘崇茹 李庚银 

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京市昌平区102206 [2]甘肃省电力公司经济技术研究院,甘肃省兰州市730030 [3]中国电力科学研究院,北京市海淀区100192

出　　处：《电网技术》2016年第7期2081-2086,共6页Power System Technology

基　　金：国家电网公司科技项目(XT71-14-038)~~

摘　　要：在风火打捆经直流外送系统中,风电功率波动将加重送端系统调峰调频压力,当直流系统采用变功率定电压输电控制策略时,可将送端调峰调频压力通过直流系统转移到网架结构较强、有充分调峰调频能力的受端地区,但同时将增加电容器等常规无功补偿装置的投切次数。为减少直流跟随风电波动时常规无功补偿装置的投切次数,提出了使用SVC替代常规无功补偿装置的方案,并提出相应的SVC和常规无功补偿装置的协调控制策略以及无功补偿装置容量优化配置方案。PSCAD/EMTDC仿真表明,所提SVC和常规无功补偿装置的协调控制策略可在不改变直流输电系统常规无功补偿装置基本控制策略的前提下,有效减少此过程中常规无功补偿装置的投切次数。同时容量优化配置结果表明,所提无功补偿装置容量优化配置方案可在满足换流母线电压约束和常规无功补偿装置投切次数约束的前提下,对SVC和常规无功补偿装置容量进行合理的优化配置,使SVC和常规无功补偿装置的总投资最小。Peak shaving and frequency modulation problem of sending system are caused by wind power fluctuation of wind-coal-bundle interconnected system with HVDC link, and transmitted to receiving system when DC system operates under variable-power constant-voltage control strategy. But action times of capacitor and other conventional reactive power compensation device（RPCD） are increased. In order to decrease their action times, the paper proposes a scheme replacing conventional RPCD with SVC. Corresponding coordinated control strategy of SVC and conventional RPCD and optimal capacity of RPCD are proposed. Simulation results of PSCAD/EMTDC show that action times of conventional RPCD can be decreased when the equipment operates under coordinated control strategy. Optimization calculation example shows that optimal capacity of RPCD can reasonable configure capacity of SVC and conventional RPCD with constraints of converter bus voltage and action times of conventional RPCD to minimize RPCD investment.

关 键 词：风火打捆 直流系统 无功补偿装置 控制策略 容量优化 

分 类 号：TM72[电气工程—电力系统及自动化]