Electric Power ›› 2021, Vol. 54 ›› Issue (5): 101-110.DOI: 10.11930/j.issn.1004-9649.202004133

Previous Articles     Next Articles

Generation Shedding Capacity Optimization of Sending-End Power Grids with Multi-DC Asynchronous Outfeeds Considering Frequency Stability

GOU Jing1, LIU Fang1, KUANG Li2, SU Yunche1, LI Ao1, WEN Yunfeng2   

  1. 1. State Grid Sichuan Power Economic Research Institute, Chengdu 610041, China;
    2. School of Electrical and Information Engineering, Hunan University, Changsha 410082, China
  • Received:2020-04-17 Revised:2020-08-14 Published:2021-05-05
  • Supported by:
    This work is supported by the National Natural Science Foundation of China (No.51707017), Science and Technology Project of State Grid Corporation of China (Research on the Development Form and Key Planning Technology of Sichuan Power Grid for the Construction of Pure Clean Energy Power System, No.SGSCJY00GHJS1900010)

Abstract: For the asynchronous interconnection system, the inertia of sending-end power grid drops sharply. Because of the severe high frequency problems caused by bipolar blocking of a HVDC transmission line, the traditional generation shedding strategy for dealing with the high frequency problems has some risks such as inaccurate shedding capacity (i.e. over- shedding or under-shedding) and lack of the rotational inertia after shedding. In order to solve the inadequacy of existing generation shedding schemes, we propose a generation shedding capacity optimization model for the sending-end grid with multi-DC asynchronous outfeeds considering the stability of system frequencies. The model comprehensively considers a variety of constraints, such as the frequency constraints, network power flow constraints, reserve constraints, and the constraints of generator-tripping capacity. By taking account of the adjustment performance and geographical distribution differences of various units in the sending-end grid, the TOPSIS method and the Superiority Chart are used to obtain the penalty factors of various units, and the optimal generation shedding scheme of the sending-end grid is determined for the bipolar blocking fault of a large-capacity HVDC transmission line with the goal to minimize the comprehensive cost of generator tripping. An improved IEEE RTS-79 test system is taken for case study, which has verified the effectiveness and the frequency adaptability of the proposed model.

Key words: asynchronous interconnection, sending-end power grid, generation shedding, inertia, DC transmission, frequency stability