应用于光伏微网的一种虚拟同步发电机结构及其动态性能分析

发布时间：2019-06-18 22:30

【摘要】：可再生能源、分布式发电和微电网技术长期以来受到广泛关注,传统的并网逆变器控制策略没有考虑其惯性缺失导致频率变化率过快的问题,因而采用虚拟同步发电机策略模拟同步机特性,提升新能源并网发电的备用旋转惯量。对于光伏微电网,当前大多数的虚拟同步机方案将光-储结合结构作为直流侧,其性能的实现仅需要控制逆变器模拟同步机特性即可。该方案控制策略简单,但具有硬件结构复杂、不灵活的缺陷。文章介绍了一种光伏微电网中的虚拟同步发电机结构的应用以及相应控制策略,并研究其动态性能,该结构灵活可靠、易于扩展。仿真和实验证明了该结构及相应的控制策略能在光伏功率波动和负载变化时稳定母线频率,提升微电网的动态性能。
[Abstract]:Renewable energy, distributed generation and microgrid technology have been widely concerned for a long time. The traditional control strategy of grid-connected inverter does not consider the problem that the frequency change rate is too fast caused by the lack of inertia, so the virtual synchronous generator strategy is used to simulate the characteristics of synchronizer and improve the standby rotating inertia of new energy grid-connected power generation. For photovoltaic microgrid, most of the current virtual synchronizer schemes use the optical-storage combination structure as the DC side, and the performance of the virtual synchronizer can only be realized by controlling the characteristics of the inverter to simulate the synchronizer. The control strategy of the scheme is simple, but it has the defects of complex hardware structure and inflexibility. This paper introduces the application of a virtual synchronous generator structure in photovoltaic microgrid and its corresponding control strategy, and studies its dynamic performance. The structure is flexible, reliable and easy to expand. Simulation and experiments show that the structure and the corresponding control strategy can stabilize the bus frequency and improve the dynamic performance of the microgrid when the photovoltaic power fluctuates and the load changes.
【作者单位】：电力设备电气绝缘国家重点实验室(西安交通大学);
【分类号】：TM71

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