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| An Analysis Model for Power Transfer from Loop Closing in Distribution Network Considering Load Equivalent Impedance |
| Lai Shengjie1,2, Xia Chengjun1,2, Ji Huancong1,2, Wang Zeqing1,2 |
1. School of Electric Power South China University of Technology Guangzhou 510640 China;
2. Guangdong Province' New Energy Power System Intelligent Operation and Control Enterprise Key Laboratory Guangzhou 510663 China |
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Abstract Loop closing of distribution network to transfer power has become a common method for load transfer, and loop closing model of distribution network is the key to loop closing analysis. Most of the existing analysis models for power transfer from loop closing ignore load impedance, which can cause large deviations in the calculation of loop closing current. Considering the influence of load on the steady-state and transient processes of loop closing, this paper equivalently processes the load based on the real-time measurement information of a small amount of micro-phasor measurement unit (μPMU) at the head and end of the feeder, and proposes a loop closing analysis model for power transfer considering the equivalent impedance of the load. On the basis of this model, the superposition principle is used to analyze the calculation of steady-state current and surge current in detail. In view of the shortcomings in solving the surge current of loop closing at present, an effective method for solving the surge current of loop closing on the optimum frequency method is proposed. A concrete example model is built based on PSCAD/EMTDC simulation software, which verifies the validity of the model and calculation method proposed in this paper.
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Received: 19 April 2021
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2022, Vol. 37 
