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直流馈入受端电网暂态电压与频率稳定紧急协调控制策略
作者:
作者单位:

1.河海大学可再生能源发电技术教育部工程研究中心,江苏省南京市 210098;2.国网安徽省电力有限公司,安徽省合肥市 230061

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基金项目:

国家电网公司总部科技项目(受端电网频率和电压动态稳定全过程辅助决策技术研究,XT71-17-008)。


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

    为应对多直流馈入受端电网直流闭锁故障导致的暂态电压和暂态频率稳定问题,提出一种综合考虑直流功率紧急提升、调相机紧急控制和切负荷的紧急协调控制策略。首先,采用了基于多二元表的暂态稳定裕度指标,分析了直流功率紧急提升和调相机紧急控制对受端电网暂态电压稳定的影响,提出了受端电网多控制手段紧急协调控制方案。其次,基于该控制方案,计及暂态电压和暂态频率稳定约束,以控制代价最小为目标,建立了多控制手段下受端电网紧急协调控制优化模型。然后,采用灵敏度法将模型线性化,考虑了直流功率紧急提升对暂态电压稳定的负面影响,并采用逐次线性规划方法求解。最后,通过华东电网实际案例结果验证了所提控制策略的有效性。

    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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引用本文

赵晋泉,汤建军,吴迪,等.直流馈入受端电网暂态电压与频率稳定紧急协调控制策略[J/OL].电力系统自动化,http://doi.org/10.7500/AEPS20191019002.
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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  • 收稿日期:2019-10-19
  • 最后修改日期:2020-04-26
  • 录用日期:2020-01-09
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