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孤岛微网分层分布式频率调节及功率优化控制
作者:
作者单位:

1.哈尔滨工业大学(威海)新能源学院,山东省威海市 264200;2.国网江苏省电力有限公司无锡供电分公司,江苏省无锡市 214000

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基金项目:

国家自然科学基金资助项目(61773137);山东省自然科学基金资助项目(ZR2019MF030);博士后科学基金资助项目(2018M641830)。


Hierarchical Distributed Frequency Regulation and Power Optimization Control for Island Microgrid
Author:
Affiliation:

1.School of New Energy, Harbin Institute of Technology (Weihai), Weihai 264200, China;2.Wuxi Power Supply Company of State Grid Jiangsu Electric Power Co., Ltd., Wuxi 214000, China

Fund Project:

This work is supported by National Natural Science Foundation of China (No. 61773137), Shandong Provincial Natural Science Foundation of China (No. ZR2019MF030) and Post-doctoral Science Foundation of China (No. 2018M641830).

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    摘要:

    为提高微网频率调节和功率优化性能,提出一种两层控制结构。为适应这一结构,初级控制由传统的功率-频率下垂改进为功率-增量因子下垂。二层控制采用一致性协议以分布式方式实现频率同步、频率无差、功率优化目标。此外,针对功率约束问题,分析发现只采用饱和器会导致频率无差和功率优化目标间的冲突,为解决这一冲突,提出相应的功率约束控制方法。通过Lyapunov直接法论证了所提控制策略在系统中的稳定性。最后,采用5节点孤岛微网仿真算例验证了所提策略的有效性。

    Abstract:

    In order to improve the performance of frequency regulation and power optimization for microgrid, a two-layer control structure is proposed, in which the primary control converts the traditional power-frequency droop into the power-increment factor droop to accommodate this structure. The secondary control uses a consensus protocol to achieve the goals of frequency synchronization, frequency no-difference and power optimization in a distributed manner. In addition, it is found that if only the saturator is used for power constraint, it will lead to conflicts between frequency regulation and power optimization. To solve this conflict, a corresponding power constraint control method is proposed. The stability of the proposed control strategy in the system is demonstrated by the Lyapunov direct method. Finally, the effectiveness of the strategy is verified by a simulation example of 5-node island microgrid.

    表 6 Table 6
    表 4 Table 4
    表 3 Table 3
    表 2 Table 2
    图1 孤岛微网分层控制结构Fig.1 Hierarchical control structure for island microgrid
    图3 饱和器作用下的冲突Fig.3 Conflict under action of a saturator
    图4 三层控制仿真结果Fig.4 Simulation results of three-layer control
    图5 所提两层控制仿真结果Fig.5 Simulation results of proposed two-layer control
    图 基于传统下垂曲线的二层控制过程Fig. Working process of secondary control based on traditional droop curve
    图 电力网络的图论模型<xref ref-type=bibr rid=R25>25Fig. Graph theory model of power network<xref ref-type=bibr rid=R25>25
    图 功率约束控制Fig. Power constraint control
    图 孤岛微网仿真算例Fig. Simulation example of island microgrid
    图 初级控制仿真结果Fig. Simulation results of primary control
    图 饱和器控制下的仿真结果Fig. Simulation results of saturator control
    图 功率约束控制下的仿真结果Fig. Simulation results of power constraint control
    表 5 Table 5
    表 7 Table 7
    表 1 稳定裕度对比Table 1 Stability margin comparison
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引用本文

于国星,侯睿,汪任潇,等.孤岛微网分层分布式频率调节及功率优化控制[J].电力系统自动化. DOI:10.7500/AEPS20190603004.

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历史
  • 收稿日期:2019-06-03
  • 最后修改日期:2020-01-19
  • 录用日期:2019-10-08
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