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考虑源荷频率特性的含风电交直流系统概率连续潮流方法
作者:
作者单位:

1.长沙理工大学电气与信息工程学院,湖南省 长沙市 410114;2.国网湖南省电力有限公司经济技术研究院,湖南省 长沙市 410004

作者简介:

刘振磊(1992—),男,硕士研究生,主要研究方向:电力系统运行与控制。E-mail:sdaulzhl@foxmail.com

通讯作者:

马瑞(1971—),男,通信作者,博士,教授,博士生导师,主要研究方向:电力系统分析与控制、能源互联网和大数据等。E-mail: marui818@126.com

基金项目:

国家自然科学基金资助项目(51677007);湖南省自然科学基金资助项目(2019JJ40298)。


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

    针对传统连续潮流方法难以适应大规模风电接入交直流互联系统的实际情况,提出了一种含风电交直流系统概率连续潮流计算方法。该方法在兼顾常规机组调频特性和负荷电压/频率静特性基础上,进一步考虑风电出力随机性、直流控制方式和频率波动偏差约束,建立考虑电源调频和负荷电压/频率静特性的含风电交直流系统概率连续潮流方程;通过其修正方程的雅可比矩阵,推导能反映频率波动、风电出力和控制方式等因素的负荷裕度灵敏度指标;基于统一迭代法,结合蒙特卡洛方法和预估-校正方法获取系统N和N-1状态时多场景潮流解和负荷裕度。最后,修改的IEEE 39节点系统算例仿真结果验证了所提方法的正确性和有效性。

    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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马瑞,刘振磊,贺平平,等.考虑源荷频率特性的含风电交直流系统概率连续潮流方法[J].电力系统自动化,2020,44(6):27-36. DOI:10.7500/AEPS20190217002.
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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历史
  • 收稿日期:2019-02-17
  • 最后修改日期:2019-09-13
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  • 在线发布日期: 2020-03-21
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