用于大规模集中式风电并网的VSC-HVDC频率控制方法  

Frequency control of grid-connection system based on VSC-HVDC for large-scale centralized wind farm

作　　者：潘伟[1] 李勇[1] 曹一家[1] 辛建波[2] 

机构地区：[1]湖南大学电气与信息工程学院,湖南长沙410082 [2]国网江西省电力公司,江西南昌330077

出　　处：《电力自动化设备》2015年第5期94-99,共6页Electric Power Automation Equipment

基　　金：国家科技支撑计划项目(2013BAA01B01);国家自然科学基金资助项目(51377001;61233008);国网公司重大科技项目(5216A014007V);湖南省自然科学基金重点资助项目(12JJ2030)~~

摘　　要：针对大规模集中式风电并网过程中送端系统频率波动以及电能输送损耗严重等问题,提出一种基于电压源型换流器高压直流输电(VSC-HVDC)的大规模风电并网系统频率稳定控制方法。VSC送端换流器通过调节脉宽调制(PWM)移相角来控制交流侧电压相位大小,以达到控制线路有功功率传输的目的,从而保证风电并网系统有功功率的平衡及系统频率的稳定,同时通过调节PWM调制比来调节交流电压,使系统电压维持稳定;受端换流器控制直流侧电压的稳定,以保证VSC-HVDC系统的正常运行。通过在Power Factory Digsilent上进行仿真,验证了该控制策略能显著增强系统的频率稳定性。Aiming at the frequency fluctuation of sending-side system and serious power transmission loss during the grid-connection of large-scale centralized wind farm,a method of frequency stability control based on VSC-HVDC is proposed. The sending-side converter of VSC regulates the phase-shifting angle of PWM to control the AC-side voltage phase and the active power of transmission line,which ensures the active power balance and frequency stability of the grid-connected wind power generation system. The AC voltage is adjusted by the PWM modulation ratio to maintain the voltage stability of system. The stability of DC voltage is controlled by the receiving-side converter to ensure the normal operation of VSC-HVDC system. Simulation is carried out on Power Factory Digsilent,which verifies that the proposed control strategy can greatly enhance the frequency stability of system.

关 键 词：风电 VSC-HVDC 频率控制 直流电压 稳定性 并网 集中式 高压直流输电 电压控制 

分 类 号：TM614[电气工程—电力系统及自动化]