风电场柔性直流并网与传统直流外送的源网协调控制策略  

A Coordinated Source-Grid Control Strategy for Wind Farm Integration With VSC-HVDC and Transmission With LCC-HVDC

作　　者：曾雪洋 刘天琪[1] 王顺亮[1] 李保宏[1] 李兴源[1] 曾琦[1] 陈相[1] 

机构地区：[1]四川大学电气信息学院,四川省成都市610065

出　　处：《电网技术》2017年第5期1390-1397,共8页Power System Technology

基　　金：国家电网公司科技项目(SGNXDKOOBGJS160021)~~

摘　　要：针对西部高原地区风电场采用柔性直流并网与传统直流外送导致送端电网频率变化敏感的问题,提出传统直流、柔性直流、风电场参与送端电网频率调节的源网协调控制策略。首先,在传统直流和风机中引入一次调频特性和惯性控制环节的变功率附加控制,在柔性直流电网侧换流站引入变电压附加控制,风电场侧换流站引入变频和直流电压偏差附加控制;其次,协调了发电机、传统直流、柔性直流、风电场参与送端电网频率调节的时序;最后,在PSCAD/EMTDC中搭建仿真模型。仿真结果表明:该源网协调控制策略能增加送端电网的惯量,提高系统频率稳定性;能有效减小送端电网故障期间柔性直流的直流电压波动幅度。To solve frequency-sensitive variance of sending end power grid（SEPG）, caused by technical solution of wind farm integrated with voltage sourced converter based HVDC（VSC-HVDC） and transmitted with line commuted converter based HVDC（LCC-HVDC） in plateau area of Western China, a coordinated source-grid control strategy is proposed. In this strategy, LCC-HVDC, VSC-HVDC and wind farm participate in SEPG frequency regulation. Firstly, considering primary frequency control and inertia response control, variable power supplementary control is implemented in LCC-HVDC and wind turbines, and variable voltage supplementary control is implemented in grid side VSC. Variable frequency control and DC voltage marginal supplementary control are implemented in wind farm VSC. Secondly, timing sequence of frequency regulation, in which generators, LCC-HVDC, VSC-HVDC and wind farm participate, is coordinated in SEPG. Finally, a simulation model is set up in PSCAD/EMTDC. Simulation results show that the coordinated source-grid control strategy can improve inertia time constants and SEPG frequency stability, and effectively reduce DC voltage fluctuation amplitude of VSC-HVDC when fault occurs in SEPG.

关 键 词：风电场 传统直流 柔性直流 附加控制 源网协调控制 

分 类 号：TM46[电气工程—电器] TM71