独立混合微网中的有功协同分配和控制

发布时间：2021-05-25 09:29

　　分布式发电（Distributed Generation,DG）的快速发展促进了微网的发展。微网是一种为社区供电而设计的小型电力系统,通过将分布式发电和负荷集成在一起,微网可最小化电能转换的损失,提高系统的可靠性、效率、灵活性和冗余度。早期微网多采用交流供电模式,但随着半导体工业的发展和直流负荷的日益增多,直流微网越来越受到研究者和工业界的关注。近年来,可充分利用交直流系统优点的交直流混合微网发展迅速。其中交流和直流微网通过互联变换器（Interlinking Converters,ILC）连接。ILC在调节直流电压和交流频率的同时,对双向潮流进行管理,是交直流微网中重要的系统组成部分。根据是否需要通信信道,ILC的控制方案大致可分为于通信的控制和自主控制两类。基于通信的方案涉及到通过通信忘了交换信息,这会增加系统的总成本和及信息安全问题。自主控制仅需本地信息,不需要额外的通信传递,但需要考虑不同功率源协同问题。由于其成本低、可靠性高、即插即用等特点,在微网中得到了广泛的应用。目前已有多种采用直流电网电压和交流电网频率来管理双向电源的下垂控制方案。但这些方案大多涉及控制模式之间的切换,... 

【文章来源】：华北电力大学(北京)北京市 211工程院校 教育部直属院校

【文章页数】：117 页

【学位级别】：博士

【文章目录】：
摘要
Abstract
1 Introduction
    1.1 Background
    1.2 Hybrid microgrid components and topologies
        1.2.1 Conventional topology
        1.2.2 Multi-microgrid
        1.2.3 SST-based hybrid structure
    1.3 Significance of research
    1.4 Outline of thesis
2 Control strategies within hybrid grid
    2.1 Droop control within individual microgrids
        2.1.1 Conventional droop
        2.1.2 Angle droop
        2.1.3 Voltage current droop
        2.1.4 Alternate droop controls
    2.2 ILC Droop control schemes
        2.2.1 Normalised droop
        2.2.2 Modified ac-dc droop
        2.2.3 Voltage current droop
    2.3 Communication-based control
        2.3.1 Centralised control
        2.3.2 Distributed control
        2.3.3 Master slave control
    2.4 Concluding remarks
3 Generalized ILC droop scheme
    3.1 Introduction
        3.1.1 Shortcomings
        3.1.2 Features and contributions
    3.2 Droop-based ILC control
    3.3 Mathematical model of the system
    3.4 Simulation results
        3.4.1 Single hybrid microgrid
        3.4.2 Multi-hybrid microgrids
    3.5 Concluding remarks
4 Small signal stability analysis of hybrid grid
    4.1 Introduction
        4.1.1 Shortcomings
        4.1.2 Features and contributions
    4.2 Small signal model
        4.2.1 Interlinking converter
        4.2.2 Ac microgrid
        4.2.3 Dc microgrid
    4.3 Stability analysis
        4.3.1 Eigenvalue sensitivity to scaling factors
        4.3.2 Eigenvalue sensitivity to dc link capacitance and filter inductance
        4.3.3 Ac system SCR
    4.4 Simulation results
    4.5 Concluding remarks
5 Economical multi-mode ILC control scheme
    5.1 Introduction
    5.2 Interconnected grid topology and ILC modes
    5.3 Proposed ILC control scheme
        5.3.1 Primary control
        5.3.2 Secondary control
        5.3.3 Cost-based droop
        5.3.4 Switching between control modes
    5.4 Simulation results
        5.4.1 Primary control in a single hybrid microgrid
        5.4.2 Primary and secondary ILC control
        5.4.3 Cost-based ILC control
    5.5 Concluding remarks
6 Conclusions and future work
    6.1 Conclusions
    6.2 Future work
References
Papers published in the period of Ph.D. education
Research work in the period of Ph.D. education
Acknowledgements
Resume



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