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Emergency Coordination Control Strategy for Transient Voltage and Transient Frequency Stability in HVDC Infeed Receiving-end Power Grid
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Affiliation:

1.Research Center for Renewable Energy Generation Engineering, Ministry of Education, Hohai University, Nanjing 210098, China;2.State Grid Anhui Electric Power Co., Ltd, Hefei 230061, China

Fund Project:

This work is supported by State Grid Corporation of China (Research on the Whole Process Decision Support Technology for Frequency and Voltage Dynamic Stability of Receiving-end Power Grid, No. XT-71-17-008).

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    Abstract:

    In order to deal with the transient voltage and transient frequency stability problems of the multi-infeed high-voltage direct current (HVDC) receiving-end power grid when HVDC lines are blocked, an emergency coordination control strategy considering HVDC power emergency lifting, synchronous condenser emergency control and load shedding is proposed. Firstly, the transient voltage and frequency stability margin index based on multiple two-element notations is adopted. The impact of HVDC power emergency lifting and synchronous condenser emergency control on transient voltage stability of the receiving-end power grid is analyzed, and an emergency coordination control scheme with multiple control means is proposed. Secondly, based on the proposed scheme, an optimization model is established for the emergency coordination control of receiving-end power grid with multiple control means, which considers both transient voltage and transient frequency stability constraints and aims at minimizing the control cost. Then, the sensitivity is used to linearize the model, where the negative impact of HVDC power emergency lifting on transient voltage stability is considered. Moreover, the model is solved by the successive linear programming method. Finally, results of a real example in East China power grid show that the proposed control strategy is effective.

    表 1 各控制手段的最大可控量Table 1 The maximum controllable values of each control means
    表 4 单一控制手段与多控制手段下的切负荷总量对比Table 4 Comparison of total load shedding by single and multiple control means
    图1 基于多二元表的暂态跌落区域划分示意图Fig.1 Schematic diagram of transient drop region division based on multiple two-element notations
    图2 基于SLP的紧急控制策略流程图Fig.2 Flow chart of SLP based emergency control strategy
    图 故障后系统暂态频率响应曲线Fig. Transient frequency response curve of the system after fault
    图 故障后500kV母线暂态电压响应曲线Fig. Transient voltage response curve of the 500kV-bus after fault
    图 紧急控制前后系统暂态频率响应曲线Fig. Transient frequency response curve of the system before and after emergency control
    图 紧急控制前后系统暂态电压响应曲线Fig. Transient voltage response curve of the system before and after emergency control
    图 调相机2种控制方式下的系统暂态电压响应曲线Fig. Transient voltage response curve of the system under two control modes of condenser
    图 调相机2种控制方式下的系统暂态频率响应曲线Fig. Transient frequency response curve of the system under two control modes of condenser
    表 3 紧急控制与常规控制下的切负荷总量对比Table 3 Comparison of total load shedding with emergency and conventional control
    表 2 迭代过程中各控制量的变化Table 2 Variation of control variables during iteration
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ZHAO Jinquan,TANG Jianjun,WU Di,et al.Emergency Coordination Control Strategy for Transient Voltage and Transient Frequency Stability in HVDC Infeed Receiving-end Power Grid[J/OL].Automation of Electric Power Systems,http://doi.org/10.7500/AEPS20191019002.

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History
  • Received:October 19,2019
  • Revised:April 26,2020
  • Adopted:January 09,2020
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