电力系统保护与控制2017，Vol.45Issue(20)：73-78,6.DOI:10.7667/PSPC201725
交流不对称故障下的LCC-MMC混合直流系统输送功率提升策略研究
Research on power transmission enhancement strategy of LCC-MMC hybrid HVDC system under AC symmetric fault
时伯年 1洪潮 2孙刚 1张野 2杨健2
作者信息
- 1. 北京四方继保自动化股份有限公司,北京100085
- 2. 南方电网科学研究院有限责任公司,广东广州510663
- 折叠
摘要
Abstract
The hybrid HVDC system,which adopts line commutated converter in rectifier side,and modular multilevel converter in inverter side,can combine the advantages of the two converters and has broad application prospects.Based on the study of the basic steady-state operation control characteristics,the DC transmission power drop and the interruption problem caused by the asymmetric fault of the AC power network are analyzed emphatically on the basis of the LCC-MMC hybrid HVDC transmission system.And the AC fault characteristics of the hybrid HVDC system are analyzed.It is found that the DC voltage drop caused by the asymmetrical fault is most likely to cause the interruption of the transmission power at the rectifier side,and cause the voltage anomaly at the inverter side.A supplementary DC voltage control strategy based on MMC typical control is proposed to improve the transmission capacity of the DC system by reducing the reference DC voltage of the inverter in the modulation range.If it is detected that the inverter side DC component of the DC voltage exceeds the limit value,the additional control strategy is automatically input,without relying on the communication between the converter stations.Finally,the feasibility of the proposed control strategy is verified by PSCAD/EMTDC electromagnetic transient simulation.关键词
混合直流输电系统/交流不对称故障/调制比/附加直流电压控制/功率提升Key words
hybrid HVDC system/AC symmetric fault/modulation ratio/supplementary DC voltage control/power boost引用本文复制引用
时伯年,洪潮,孙刚,张野,杨健..交流不对称故障下的LCC-MMC混合直流系统输送功率提升策略研究[J].电力系统保护与控制,2017,45(20):73-78,6.
