Self-Synchronized Synchronverters: Inverters Without a Dedicated Synchronization Unit
Self-Synchronized Synchronverters: Inverters Without a Dedicated Synchronization Unit
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DOI：
10.1109/tpel.2013.2258684
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发表时间：
2014-02
影响因子：
6.7
通讯作者：
Qing-Chang Zhong;P. Nguyen;Zhenyu Ma;W. Sheng
中科院分区：
文献类型：
--
作者：
Qing-Chang Zhong;P. Nguyen;Zhenyu Ma;W. Sheng
同步器是一种模仿同步发电机的逆变器，它为电力系统提供了一种控制并网可再生能源的机制，并促进了智能电网的整合。与其他并网逆变器类似，它需要一个专用的同步单元，例如，锁相环（PLL），用于提供电网电压的相位、频率和幅度作为参考。在本文中，采取了激进的一步，改进的同步器作为一个自同步器，通过删除专用同步单元。它可以在连接前自动与电网同步，并在连接后跟踪电网频率。这大大提高了控制器的性能，降低了复杂性和计算负担。原同步器的所有功能，如频率和电压调节，真实的功率和无功功率控制，都得到了保留。仿真和实验结果验证了控制策略的有效性。实验结果表明，该控制策略可使频率跟踪性能提高65%以上，真实的功率控制性能提高83%，无功功率控制性能提高70%左右。
A synchronverter is an inverter that mimics synchronous generators, which offers a mechanism for power systems to control grid-connected renewable energy and facilitates smart grid integration. Similar to other grid-connected inverters, it needs a dedicated synchronization unit, e.g., a phase-locked loop (PLL), to provide the phase, frequency, and amplitude of the grid voltage as references. In this paper, a radical step is taken to improve the synchronverter as a self-synchronized synchronverter by removing the dedicated synchronization unit. It can automatically synchronize itself with the grid before connection and track the grid frequency after connection. This considerably improves the performance, reduces the complexity, and computational burden of the controller. All the functions of the original synchronverter, such as frequency and voltage regulation, real power, and reactive power control, are maintained. Both simulation and experimental results are presented to validate the control strategy. Experimental results have shown that the proposed control strategy can improve the performance of frequency tracking by more than 65%, the performance of real power control by 83%, and the performance of reactive power control by about 70%.