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Selection of Droop Coefficients for AC/DC Hybrid Microgrid Considering Feasibility Region of Power Flow in Parameter Space
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Affiliation:

1.Key Laboratory of Control of Power Transmission and Conversion, Ministry of Education (Shanghai Jiao Tong University), Shanghai 200240, China;2.Nanjing Power Supply Company of State Grid Jiangsu Electric Power Co., Ltd, Nanjing 210019, China

Fund Project:

This work is supported by National Key R&D Program of China (No. 2016YFB0900504).

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    Abstract:

    Droop coefficients of inverters for distributed generators in AC/DC hybrid microgrid can have great influences on feasibility region of power flow in island operation mode. While traditional droop coefficients are determined by capacity and frequency of inverters and voltage regulation range, which can not give full consideration of the above influence. To fill the gap, a calculation model for power flow of AC/DC hybrid microgrid considering control modes of inverter is firstly established. Then a fast calculation method of feasibility region of power flow in parameter space is proposed, the impact of droop coefficients on feasibility region of power flow is further considered. The optimal values of droop coefficients are suggested by overall considering both load stability margin and small-signal stability factors. Finally, an improved 12-node AC/DC hybrid microgrid is simulated to verify the effectiveness and applicability of the proposed method. Results show that the voltage stability margin is significantly increased compared with traditional methods.

    表 7 Table 7
    表 6 Table 6
    表 4 Table 4
    表 2 Table 2
    表 3 Table 3
    表 1 下垂系数取值对比Table 1 Comparison of droop coefficients
    图1 参数空间下快速搜索潮流可行域边界的算法示意图Fig.1 Schematic diagram of fast searching algorithm for feasibility region boundary of power flow in parameter space
    图2 下垂系数优化方向Fig.2 Optimal directions of droop coefficients
    图3 不同类型下垂系数对潮流可行域的影响Fig.3 Impact of different types of droop coefficients on feasibility region of power flow
    图 交直流混合微电网的典型结构Fig. Sample architecture of an AC/DC hybrid microgrid
    图 不同组有功下垂系数下的负荷裕度Fig. Load stability margin of different set droop control coefficients
    图 三个参数变化时求取可行域边界流程图Fig. Flow chart of obtaining feasibility region boundary when three parameters change
    图 交直流混合微网状态方程特征根根轨迹Fig. Eigenvalue spectrum of microgrid state matrix
    图 有功下垂系数mp9变化的系统根轨迹图Fig. Eigenvalue spectrum of system as real power droop gain variation
    图 交直流混合微电网拓扑Fig. Structure of AC/DC microgrid under analysis
    图 仅改变nq9和mp9的潮流可行域Fig. Power flow feasible domain with variation of nq9 and mp9
    图 改变mp9,mp10,mp11的潮流可行域Fig. Power flow feasible domain with variation of mp9,mp10 and mp11
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PANG Lei,HAN Bei,WANG Keyou,et al.Selection of Droop Coefficients for AC/DC Hybrid Microgrid Considering Feasibility Region of Power Flow in Parameter Space[J].Automation of Electric Power Systems,2020,44(10):77-84.DOI:10.7500/AEPS20190909004

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History
  • Received:September 09,2019
  • Revised:October 15,2019
  • Adopted:
  • Online: May 22,2020
  • Published: