摘要
电磁环网可以提高电网供电可靠性,但也会造成故障后短路电流增加、线路过载等问题。南方电网公司目前主要采取解环运行和方式预控的措施来降低电磁环网运行风险,但解环不适用于所有场景,方式预控又可能造成电源出力受限。因此提出将中小容量柔性直流输电系统(VSC-HVDC)应用于含电磁环网的低压电网,利用其灵活可控的特点来降低电磁环网运行风险。首先综合考虑《电力系统安全稳定导则》要求以及经济性确定VSC-HVDC在电磁环网中的接入位置和容量,随后给出了VSC-HVDC直流电压、拓扑结构以及参数的确定原则。其次,设计了VSC-HVDC在电磁环网中的控制策略,该控制策略可以降低网损,提高电磁环网稳定性。最后通过实例仿真验证了提出的中小容量柔性直流方案在降低电磁环网运行风险方面的有效性。
Electromagnetic loop network can improve the reliability of power supply in the power grid,but it can also cause problems such as increased short-circuit current and line overload after faults.At present,grid operators mainly adopt measures such as loop breaking operation and mode pre-control to reduce the operational risks of electromagnetic loop networks in China Southern Power Grid.However,loop breaking operation is not applicable to all scenarios,and mode pre-control may cause power outputs limited.Therefore,this article proposes to apply the small and medium capacity VSC-HVDC to the low-voltage power grid with electromagnetic loop network,utilizing the flexible and controllable characteristics of VSC-HVDC to reduce the operational risk of the electromagnetic loop network.Firstly,comprehensively considering the requirements of the"Guidelines for Power System Safety and Stability"as well as the economy,the interconnected location and capacity of VSC-HVDC are determined in the electromagnetic loop network.Subsequently,the principles for determining the DC voltage,topology structure,and equipment parameters of VSCHVDC are provided.Secondly,a control strategy for VSC-HVDC in the electromagnetic loop network is put forward,which can reduce network losses and improve the stability of the electromagnetic loop network.Finally,the effectiveness of the proposed small and medium capacity VSC-HVDC scheme is verified in reducing the operation risks of the electromagnetic ring network through example simulation.
作者
孙鹏伟
周保荣
姚文峰
李诗旸
付超
苏寅生
梅勇
SUN Pengwei;ZHOU Baorong;YAO Wenfeng;LI Shiyang;FU Chao;SU Yinsheng;MEI Yong(State Key Laboratory of HVDC,Electric Power Research Institute,CSG,Guangzhou 510663,China;Power Dispatching and Control Center,CSG,Guangzhou 510663,China)
出处
《南方电网技术》
CSCD
北大核心
2024年第7期19-26,共8页
Southern Power System Technology
基金
国家自然科学基金企业创新发展联合基金项目(U22B6007)
中国南方电网有限责任公司科技项目(ZDKJXM20200059)。
关键词
中小容量VSC-HVDC
电磁环网
模块化多电平换流器
异同步控制
small and medium capacity VSC-HVDC
electromagnetic loop network
modular multilevel converter
asynchronous control
