摘要
分布式电源(distributed generation,DG)的大量应用使得主动配电网建设持续推进。主动配电网故障恢复的合环操作产生冲击电流,严重威胁电力电子设备和人身安全。由于合环瞬间电压波动造成DG输出特性变化,使得主动配电网的合环电流变得更加复杂,目前尚难以准确分析和计算。为此,建立了含DG的主动配电网合环等值模型,分析了DG对主动配电网合环电流的影响,通过分解有源辐射状开环网络与无源环状网络,推导了合环稳态电流与合环暂态电流的表达式,提出了考虑DG输出特性影响的主动配电网合环电流计算方法。算例表明,DG输出特性对合环电流具有直接影响,所提出的计算方法能够准确计算主动配电网合环电流。
The widespread application of distributed generation(DG)has been constantly promoting the construction of active distribution networks.However,the closing loop operation of the active distribution network fault recovery generates the impulse current,which seriously threatens the safety of power electronic devices and human beings.Due to the change of DG output characteristics caused by the instantaneous voltage fluctuation in the closed loop,the closing current in the active distribution network becomes more complex,and it is difficult to analyze and calculate it accurately at present.For this reason,the equivalent model of the closing loop in the active distribution network with DG is established,and the influence of DG on the closing loop current in the active distribution network is analyzed.By decomposing the active radial open-loop network and the passive loop network,the expressions of the closing loop steady-state current and the closing loop transient current are derived,and the calculation method of the closing loop current in the active distribution network considering the influence of DG output characteristics is proposed.The examples show that the DG output characteristics have a direct impact on the closing current,and the proposed calculation method can accurately calculate the closing current in the active distribution network.
作者
李邦源
李昂
石恒初
欧阳金鑫
唐一恒
许守东
王建
张丽
LI Bangyuan;LI Ang;SHI Hengchu;OUYANG Jinxin;TANG Yiheng;XU Shoudong;WANG Jian;ZHANG Li(Yuxi Power Supply Bureau,Yunnan Power Grid Co.,Ltd.,China Southern Grid,Yuxi 653399,Yunnan,China;State Key Laboratory of Transformation and Distribution Equipment and System Safety and New Technologies,Chongqing University,Chongqing 400044,China;Yunnan Electric Power Dispatch Control Center of Yunnan Power Grid Co.,Ltd.,Kunming 650011,Yunnan,China;Electric Power Research Institute of Yunnan Power Grid Co.,Ltd.,China Southern Grid,Kunming 650217,Yunnan,China)
出处
《电网与清洁能源》
CSCD
北大核心
2023年第6期115-123,共9页
Power System and Clean Energy
基金
云南电网公司科技项目计划资助(YNKJXM20220177)
国家自然科学基金面上项目(51877018)。
关键词
主动配电网
合环电流
分布式电源
故障恢复
等值建模
active distribution network
closing current
distributed generation
failure recovery
equivalent modeling
