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Probabilistic Continuous Power Flow Method for AC/DC Systems with Wind Power Considering Frequency Characteristics of Source and Load
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Affiliation:

1.School of Electrical and Information Engineering, Changsha University of Science and Technology, Changsha 410114, China;2.Economical and Technical Research Institute of State Grid Hunan Electric Power Co., Ltd., Changsha 410004, China

Fund Project:

This work is supported by National Natural Science Foundation of China (No. 51677007) and Hunan Provincial Natural Science Foundation of China (No. 2019JJ40298).

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    Abstract:

    In view of the fact that the traditional continuous power flow method is difficult to adapt to the AC/DC interconnected systems with access of large-scale wind power, this paper proposes a probabilistic continuous power flow calculation method for AC/DC systems with wind power. Based on the frequency regulation characteristics of conventional units and the static characteristics of voltage and frequency of loads, the randomness of wind power output, the DC control mode and the frequency fluctuation deviation constraints are taken into account. Then this paper establishes the probabilistic continuous power flow equation of AC/DC systems with wind power considering the frequency regulation of power sources and static characteristics of voltage and frequency of loads. Based on the Jacobian matrix of the modified equation, the load margin sensitivity index reflecting the frequency fluctuation, wind power output and control mode is derived. The power flow solution and load margin in multiple scenarios of N and N-1 states are obtained by combining Monte Carlo method and predictor-corrector method. The correctness and validity of the proposed method are verified by simulation results of the modified IEEE 39-bus system.

    表 3 直流控制方式及其控制参数Table 3 DC control modes and their control parameters
    表 6 各变量对负荷裕度的灵敏度分析Table 6 Sensitivity analysis of each variable to load margin
    表 4 定电流-定电压控制下各场景的负荷裕度期望值Table 4 Expectation of load margin for each scenario with constant current and constant voltage control
    表 2 负荷频率特性系数Table 2 Characteristic coefficients of load frequency
    表 5 定电流-定熄弧角控制下各场景负荷裕度期望值Table 5 Expectation of load margin for each scenario with constant current and constant extinction angle control
    表 1 负荷电压静特性ZIP系数Table 1 ZIP coefficient of static characteristics of load voltage
    图1 直流线路结构图Fig.1 Structure of DC line
    图2 迭代过程中的频率波动Fig.2 Frequency fluctuations during iteration
    图3 定电流-定电压控制下N-1状态时的节点最大负荷承受能力概率密度分布Fig.3 Probability density distribution of maximum load capacity of nodes in N-1 state with constant current and constant voltage control
    图4 定电流-定熄弧角控制下N-1状态时的节点最大负荷承受能力概率密度分布Fig.4 Probability density distribution of maximum load capacity of nodes in N-1 state with constant current and constant extinction angle control
    图 修改的IEEE 39节点测试系统Fig. The modified IEEE 39-bus test system
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MA Rui,LIU Zhenlei,HE Pingping,et al.Probabilistic Continuous Power Flow Method for AC/DC Systems with Wind Power Considering Frequency Characteristics of Source and Load[J].Automation of Electric Power Systems,2020,44(6):27-36.DOI:10.7500/AEPS20190217002

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History
  • Received:February 17,2019
  • Revised:September 13,2019
  • Adopted:
  • Online: March 21,2020
  • Published: