Virtual synchronous generator based frequency control in interconnected microgrids
Virtual synchronous generator based frequency control in interconnected microgrids
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DOI：
10.1016/j.egyr.2020.10.044
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发表时间：
2020-12
期刊：
影响因子：
5.2
通讯作者：
Y. Hirase;Y. Ohara;H. Bevrani
中科院分区：
文献类型：
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作者：
Y. Hirase;Y. Ohara;H. Bevrani
为了实现可持续的能源供应，人们对有效结合联合收割机可再生能源和化石燃料能源的自主分散式微电网（MG）的期望越来越高。当MG中发生功率不平衡时，基于无调速器控制（GFC），MG的输出分配和频率首先由惯性力和分布式发电机（DG）之间的同步来确定。接下来，通过MG的控制机构中的次级频率控制（LFC）来执行期望的功率共享和频率恢复。然而，在互联微网中，不仅负载（LD）而且DG也是任意连接/断开的，并且难以准确地分析同步力和联络线功率。建立了由不同惯量和时间常数的DG组成的MG的频率响应模型，并应用扩展虚拟同步发电机（E-VSG）仿真结果表明，在不干扰现有DG参数的情况下，通过适当设置E-VSG参数，可以显著缩短频率最低点和恢复时间。此外，在三个MG互连的系统中，即使在发生电力扰动的MG中不存在E-VSG，由于联络线电力，也确认了其他MG中的EVSG的类似效果。
To achieve a sustainable energy supply, the expectations are increasing for autonomous decentralized microgrids (MGs) that effectively combine renewable and fossil-fuel-based energies. When a power imbalance occurs in an MG, based on the governor free control (GFC), the output sharing and frequency of the MG are first determined by the inertial force and synchronization between distributed generators (DGs). Next, desired power-sharing and frequency recovery are performed by secondary frequency control (LFC) in the control mechanism of the MG. However, in interconnected microgrids (IMGs), not only loads (LDs) but also DGs are connected/disconnected arbitrarily, and it is difficult to analyze the synchronization forces and tie-line power accurately.Therefore, in this research, we constructed a frequency response model (FRM) of MG composed of various DGs with different inertias and time constants and applied the extended virtual synchronous generator (E-VSG) model to it. It was confirmed by the simulation that frequency nadir and recovery time could be significantly shortened by properly setting the parameters of E-VSG without interfering with those of the existing DGs. Furthermore, in a system in which three MGs are interconnected, even if there is no E-VSG in the MG where the power disturbance occurs, the similar effects by the EVSG in other MGs were confirmed due to the tie-line powers.