摘要
针对风电具有随机性与间歇性等特点,提出适用于风电场经多端柔性直流输电系统(voltage source converter based multi-terminal HVDC,VSC-MTDC)并网时的多点直流电压自适应斜率控制策略。该控制策略将稳定直流电压的任务分配给多个具备功率调节能力的换流站,换流站之间不需要通信,根据自身的功率裕度自适应调节所承担风电功率变化量的大小,合理地利用多端系统的调节容量,同时避免换流站在按照固定直流电压-有功功率斜率运行时容易引起过载运行的情况。最后利用PSCAD/EMTDC针对该控制策略进行仿真分析,结果表明这种控制方式比较适用于潮流频繁变化的风电场VSC-MTDC系统。
According to the characteristics of randomness and intermittent of wind power, a multipoint DC voltage adaptive droop control strategy was proposed for the interconnection of wind farms by VSC-MTDC. Under this control strategy, all converters which have power regulation ability would share the task of stable dc voltage. The converter which has already operated closely to the rating would share little unbalanced wind power, meanwhile the converter which has much available headroom would share more unbalanced wind power, thus avoiding the possible overloading which may occur with fixed value of power-voltage droop. Finally, simulation was processed with PSCAD/EMTDC. The simulation results showed that the proposed control which needn＇ t communication, is suitable for interconnection by VSC-MTDC of wind farms whose flow changes frequently.
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
北大核心
2014年第2期147-152,共6页
Journal of Sichuan University (Engineering Science Edition)
基金
国家"973"重点基础研究发展计划(2013CB2280204)
国家电网公司科技项目资助
