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基于VSG的柔性配电装备交流端口电压控制及稳定性分析
作者:
作者单位:

1.中国农业大学信息与电气工程学院,北京市 100083;2.配电变压器节能技术北京市重点实验室(中国电力科学研究院有限公司),北京市 100192;3.东南大学电气工程学院,江苏省南京市 210096

作者简介:

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基金项目:

国家电网公司基础性前瞻性科技项目“交直流无缝混合灵活配电系统基础理论与虚拟现实仿真方法研究”(5442PD170002)。


AC Port Voltage Control Strategy and Stability Analysis of Flexible Distribution Equipment Based on Virtual Synchronous Generator
Author:
Affiliation:

1.College of Information and Electrical Engineering, China Agricultural University, Beijing 100083, China;2.Beijing Key Laboratory of Distribution Transformer Energy-saving Technology;(China Electric Power Research Institute), Beijing 100192, China;3.School of Electrical Engineering, Southeast University, Nanjing 210096, China

Fund Project:

This work is supported by Basic and Prospective Science and Technology Project of State Grid Corporation of China (No. 5442PD170002).

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    摘要:

    向负载供电及接纳分布式电源是柔性配电装备的重要功能之一,因此柔性配电装备端口控制至关重要。文中针对柔性配电装备交流端口电压控制问题,在虚拟同步发电机控制基础上,对三相进行独立控制,通过级联准比例-谐振电压外环、电流内环提高其动态性能。进而以单相为例,详细分析柔性配电装备交流端口输出电流对电压的影响,并提出电流前馈控制策略,保证负载变化、分布式电源接入等变化过程中交流端口电压的稳定。利用阻抗建模方法分析交流端口的输出阻抗,并根据广义奈奎斯特判据验证柔性配电装备交流端口向负荷供电及接纳分布式电源时的稳定性。通过仿真和相关实验验证了所提控制策略的有效性和正确性。

    Abstract:

    Supplying power for loads and realizing the connection of distributed generators (DGs) are the essential functions of the flexible distribution equipment (FDE). Consequently, the control of AC port in FDE is intensely crucial. Aiming at the AC port voltage control of FDE, the three-phase voltage is controlled independently based on the virtual synchronous generator (VSG) control, and its dynamic performance is improved by cascaded quasi proportional-resonant (PR) voltage outer-loop and current inner-loop. Furthermore, the influence of AC port output current of FDE on the voltage is analyzed in detail by taking single-phase voltage as an example. And the current feedforward control strategy is proposed to ensure the AC port voltage stability while loads vary and DG access. The output impedance of AC port is obtained by the impedance modeling method, and the stability of FDE is analyzed by generalized Nyquist stability criterion when AC port supplies power for loads and realizes DG connection. Finally, the correctness and effectiveness of the proposed control strategy are verified by simulation and experiment.

    图1 柔性配电装备构建的分布式电源、负荷系统Fig.1 DG-load system constructed by flexible distribution equipment
    图2 柔性配电装备电力电子模块主电路拓扑Fig.2 Main circuit topology of power electronic module of flexible distribution equipment
    图3 单相电压外环-电流内环控制框图Fig.3 Block diagram of single-phase control of voltage outer-loop and current inner-loop
    图4 引入电流前馈的电压外环-电流内环控制框图Fig.4 Block diagram of control of voltage outer-loop and current inter-loop with current feedforward
    图5 负载接入柔性配电装备时不同控制策略下的交流端口波形对比Fig.5 Comparison of AC port waveforms with different control strategies when loads access to flexible distribution equipment
    图6 负载变化时暂态电压实验波形对比Fig.6 Comparison of experimental waveforms of transient voltage with load variation
    图 虚拟同步机控制框图Fig. Virtual synchronous generator control diagram
    图 柔性配电装备交流端口变换器拓扑结构Fig. Circuit topology of flexible distribution equipment AC inverter
    图 准比例-谐振控制器Bode图Fig. Bode diagram of quasi-proportional resonance controller
    图 基于阻抗分析法的小信号等效电路Fig. Small-signal equivalent circuit based on impedance analysis
    图 分布式电源接入暂态电压实验波形Fig. Comparison of Voltage experimental waveform under DGs access
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引用本文

李振,盛万兴,杜松怀,等.基于VSG的柔性配电装备交流端口电压控制及稳定性分析[J].电力系统自动化. DOI:10.7500/AEPS20190812008.

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  • 收稿日期:2019-08-12
  • 最后修改日期:2020-01-16
  • 录用日期:2019-10-19
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