华北电力大学 新能源电力系统国家重点实验室,北京 102206
杨 硕(1995—),女,山东枣庄人,硕士研究生,主要研究方向为混合直流输电(E-mail:campsis0909@163.com);
郑安然(1995—),女,江西抚州人,硕士研究生,主要研究方向为混合直流输电(E-mail:zhenganran1995@126.com);
彭 意(1997—),女,湖南湘西人,硕士研究生,主要研究方向为混合直流输电(E-mail:prudenceyi1026@163.com);
郭春义(1984—),男,山西阳泉人,副教授,博士,研究方向为高压直流输电和混合直流输电等(E-mail:chunyiguo@ outlook.com);
赵成勇(1964—),男,浙江丽水人,教授,博士研究生导师,博士,主要研究方向为柔性直流输电与高压直流输电、电能质量分析与控制等(E-mail:chengyongzhao@ncepu.edu.cn)。
收稿:2019-01-04,
修回:2019-08-15,
纸质出版:2019-09-10
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杨硕,郑安然,彭意等.混合级联型直流输电系统直流故障特性及恢复控制策略[J].电力自动化设备,2019,39(09):166-172.
YANG Shuo,ZHENG Anran,PENG Yi,et al.DC fault characteristic analysis and recovery control strategy forhybrid cascaded HVDC system[J].Electric Power Automation Equipment,2019,39(09):166-172.
杨硕,郑安然,彭意等.混合级联型直流输电系统直流故障特性及恢复控制策略[J].电力自动化设备,2019,39(09):166-172. DOI: 10.16081/j.epae.201909049.
YANG Shuo,ZHENG Anran,PENG Yi,et al.DC fault characteristic analysis and recovery control strategy forhybrid cascaded HVDC system[J].Electric Power Automation Equipment,2019,39(09):166-172. DOI: 10.16081/j.epae.201909049.
整流侧采用LCC、逆变侧采用MMC与LCC串联的混合级联型直流输电系统可实现直流故障穿越、换相失败抑制和大容量功率传输。建立混合级联型直流输电系统模型,设计系统整体控制策略,并利用PSCAD/EMTDC仿真软件研究系统功率阶跃时的动态特性,验证控制策略的有效性。对系统的直流故障特性进行仿真分析,发现若不采取合适措施,系统发生直流故障时会出现由于并联MMC之间的电流分配不均衡而产生过电流现象以及故障清除后系统恢复过程波动大的问题,为此,提出系统故障期间及故障清除后的恢复控制策略,仿真验证了该控制策略的有效性。
The hybrid cascaded HVDC system composed of LCC at rectifier side and MMC in series with LCC at inverter side can realize DC fault ride-through,commutation failure suppression and large capacity power transmission. The model of hybrid cascaded HVDC system is established and an overall control stra-tegy is designed. The dynamic characteristics of the system with step power are researched by PSCAD/EMTDC simulation software,which verifies the effectiveness of the proposed control strategy. The DC fault characteristics of the system are simulated and analyzed,and it is found that if proper measures are not taken,the over-current phenomenon caused by unbalanced current distribution between parallel MMCs when DC fault occurs and large fluctuation problem in system recovery process after fault clearing will appear,for which,a fault recovery control strategy during fault and after fault clearing is proposed,and simulation verifies the effectiveness of the control strategy.
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