基于虚拟同步机的微网逆变器无频差控制

发布时间：2018-03-14 19:49

本文选题：DG　切入点：微网　出处：《电网技术》2016年07期 　论文类型：期刊论文

【摘要】：虚拟同步机控制可克服传统并网逆变器无惯性给电网带来的冲击,可提升电网接纳可再生能源的能力,在微电网中受到了广泛关注。但由于虚拟同步机采用传统的有功?频率下垂控制,在孤网模式下存在频率偏移,这会对接入微网中的负载产生不利的影响。提出了一种无频差的有功-频率控制算法,即在转子运动方程中,用频率比例积分反馈代替传统的阻尼环节,消除了孤网模式下的频率偏移,同时能够实现微网逆变器的多模式控制。建立系统降阶小信号模型,以系统的稳态性能、动态性能和微网系统相关参数指标为约束条件对所提控制器参数进行优化设计。最后,仿真和实验结果证实了控制算法的有效性和可行性。
[Abstract]:Virtual synchronous machine control can overcome the impact of traditional grid-connected inverter without inertia on the grid, can enhance the ability of the grid to accept renewable energy, and has been widely concerned in the micro-grid. But because of the virtual synchronous machine using traditional active power? Frequency droop control, which has frequency offset in the isolated network mode, will have a negative effect on the load connected to the microgrid. An active power-frequency control algorithm with no frequency difference is proposed, that is, in the rotor motion equation, The frequency offset in the isolated grid mode is eliminated by replacing the traditional damping link with the frequency proportional integral feedback. At the same time, the multi-mode control of the micro-grid inverter can be realized, and the reduced order small signal model of the system is established for the steady-state performance of the system. The dynamic performance and the parameters related to the microgrid system are the constraints to optimize the design of the proposed controller parameters. Finally, the simulation and experimental results show the effectiveness and feasibility of the control algorithm.
【作者单位】：湘潭大学自动控制研究所;深圳市盛弘电气股份有限公司;
【基金】：国家自然科学基金项目(51577162) 湖南省教育厅项目(13C905)~~
【分类号】：TM464

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