连接弱交流系统的高压直流换流站无功补偿协调控制策略  

Coordinated Control Strategy of Reactive Compensation for HVDC Converter Station Connected to Weak AC System

作　　者：丁立国[1,2] 沈阳武[2] 许加柱[1] 呙虎[2] 李世军[1] 张斌[2] DING Liguo SHEN Yangwu XU Jiazhu GUO Hu LI Shijun ZHANG Bin(National Electric Power Conversion and Control Engineering Technology Research Center （Hunan University）, Changsha 410082, China Stale Grid Hunan Electric Power Corporation Research Institute, Changsha 410007, China)

机构地区：[1]国家电能变换与控制工程研究中心(湖南大学),湖南省长沙市410082 [2]国网湖南省电力公司电力科学研究院,湖南省长沙市410007

出　　处：《电力系统自动化》2017年第8期22-29,共8页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(51477044);国家电网公司科技项目(5216A015001S)~~

摘　　要：在馈入端交流系统强度较弱、直流传输功率频繁波动的高压直流系统中,换流站无功补偿设备的协调控制对改善换流母线电压的稳定性具有重要意义。提出了一种基于静态同步补偿器(STATCOM)和电容器组相互协调的多模式协调控制策略,主要包括换流母线电压无静差跟踪额定电压的稳态调压模式、换流站参与近区交流系统电压调节的自动电压控制(AVC)模式,以及换流母线发生短路故障时抑制电压波动与换相失败的暂态控制模式。基于实际工程参数,在电磁暂态仿真软件(PSCAD)建立了±800kV酒泉—湖南特高压直流输电系统仿真模型,并在直流功率波动、AVC中心下发指令电压和馈入交流系统短路故障等多种工况下对该多模式控制策略的性能进行了仿真验证。仿真结果论证了所提出的换流站无功补偿设备协调控制策略的合理性和有效性。Coordinated control of reactive power compensation is essential to the stability of bus vohage in high vohage direct currenl （FIVI）C） connected to weak AC system and charac＊erized with frequent power fluctuation. Based on the coordination of tile static synchronous compensator and fixed capacitors, a muhi mode control strategy is proposed, including the steady state vohage regulation mode, the automatic voltage control （AVC） mode and the transient control mode. In the steady vohage regulation mode, the converter bus vohage can be controlled at its rated value with zero steady state error by the coordinated control of the static synchronous compensator （STATCOM） and capacitor hank, while the reactive component devices of the HVDC converter will participate in the voltage regulation of nearby power grid in the AVC mode, and the transient control mode is created for mitigating voltage fluctuation and reducing the probahility of commutation failure during grid fauh period. Besides. according to the actual parameters of the 4-800 kV DC power transmission project from Jiuquan to Hunan, a model is established. Then. different working conditions, such as DC power fluctuation, operation complying with the AVC commands and short circuit accident are carried out. The correctness and effectiveness of the proposed control strategy are verified by the simulation resuhs.

关 键 词：直流输电 弱交流系统 功率波动 多模式控制策略 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM714.3