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基于三相四线制最优潮流的低压配电网光伏-储能协同控制
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中国农业大学信息与电气工程学院,北京市 100083

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基金项目:

国家重点研发计划资助项目(2017YFB0903000);国家自然科学基金资助项目(51377162)。


Coordinated Control of Photovoltaic and Energy Storage System in Low-voltage Distribution Networks Based on Three-phase Four-wire Optimal Power Flow
Author:
Affiliation:

College of Information and Electrical Engineering, China Agricultural University, Beijing 100083, China

Fund Project:

This work is supported by National Key R&D Program of China (No. 2017YFB0903000) and National Natural Science Foundation of China (No. 51377162).

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    摘要:

    大规模户用光伏不平衡接入低压配电网会造成严重的电压越限、网损和三相不平衡。针对当前户用光伏消纳控制技术对三相四线制低压配电网不适用的问题,提出了一种基于三相四线制最优潮流的低压配电网光伏-储能协同控制方法。考虑电压和电流的幅值和相角,采用三相四线制节点导纳矩阵建立了低压配电网的网络拓扑结构;综合考虑网损和三相不平衡度最小,建立了储能元件有功功率和光伏逆变器无功功率的三相四线制线路多时段协同控制模型;通过复数变量拆分和模型凸化以降低三相四线制模型的求解难度,采用CPLEX算法包求出模型全局最优解。仿真结果表明,所提出的基于最优潮流的控制方法在大规模光伏和负荷不对称接入条件下能够有效抑制电压越限,同时达到降低网损、改善电网三相不平衡的目的。

    Abstract:

    The unbalanced connection of large-scale residential photovoltaic (PV) power integrated into low-voltage distribution network (LVDN) will bring problems such as voltage violations, power losses and three-phase imbalance. In order to solve the problem that the accommodation control technology is not suitable to the three-phase four-wire low-voltage distribution system, a coordinated control method considering PV and energy storage system (ESS) is proposed based on three-phase four-wire optimal power flow (OPF). The network topology of LVDN is established by using three-phase four-wire node admittance, where the amplitudes and phase angles of voltage and current are considered. Multi-period coordinated control model of three-phase four-wire lines for active power of energy storage elements and reactive power of PV inverters is developed by overall considering the minimum of both power loss and three-phase imbalance. The difficulty of solving three-phase four-wire model is reduced through complex variable decomposition and model convexity, and the global optimal solution can be got by CPLEX method package. Simulation results show that the proposed OPF based control method can effectively mitigate the voltage violation in conditions of large-scale PV and load unbalanced connection, meanwhile the network power loss is reduced and the degree of three-phase imbalance is also optimized.

    表 2 不同线路结构下的结果Table 2 Results of different line structures
    表 3 Table 3
    图1 低压配电网三相四线制线路模型Fig.1 Three-phase four-wire line model of distribution network
    图2 21母线的低压配电网Fig.2 Low-voltage distribution network with 21 buses
    图3 典型日功率曲线Fig.3 Power curves of a typical day
    图4 无控制时节点电压Fig.4 Node voltage without control
    图5 控制方法下节点电压Fig.5 Node voltage by using control method
    图6 控制方法下储能系统有功功率与SOCFig.6 Active power and SOC of energy storage system by using control method
    图 光伏、负荷及储能接入低压配电网示意图Fig. Schematic diagram of photovoltaic, load and energy storage connecting to low-voltage distribution network
    图 无控制时三相不平衡度Fig. VUF without control
    图 控制方法下三相不平衡度Fig. VUF under control
    图 控制方法下光伏无功功率Fig. PV reactive power under control
    表 5 Table 5
    表 4 Table 4
    表 1 不同控制策略下的结果Table 1 Results of different control strategies
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引用本文

唐巍,李天锐,张璐,等.基于三相四线制最优潮流的低压配电网光伏-储能协同控制[J/OL].电力系统自动化,http://doi.org/10.7500/AEPS20190609004.
TANG Wei,LI Tianrui,ZHANG Lu,et al.Coordinated Control of Photovoltaic and Energy Storage System in Low-voltage Distribution Networks Based on Three-phase Four-wire Optimal Power Flow[J/OL].Automation of Electric Power Systems,http://doi.org/10.7500/AEPS20190609004.

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  • 收稿日期:2019-06-09
  • 最后修改日期:2020-03-09
  • 录用日期:2019-10-18
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