In order to improve the friendliness of the grid connection of new energy power generation, the new energy photovoltaic (PV) unit is equivalent to a synchronous generator in the power system and a virtual synchronous generator (VSG)-controlled PV energy storage complementary grid-connected power generation system model is established and studied to analyze the VSG. When power is supplied to the load together with the power grid, the energy storage unit inside the VSG will release and store the electrical energy according to the fluctuation of the PV output, which plays the role of the adjustment of the prime mover; in the case of load power fluctuations, and power grid assume the corresponding active power regulation according to their capacity. The amount of active power adjustment to jointly and maintain the power balance inside the system under the condition of fluctuating load power. The overall system architecture and control strategy of PV grid-connected inverter based on VSG algorithm are proposed. The PV-VSG proposed here not only takes into account the maximum power point tracking control but also has independent participation in the power supply. A series of characteristics of synchronous generators, such as network frequency modulation voltage regulation and inertia damping, can effectively improve the new energy PV power generation system and promote the new energy consumption. The results of system simulation and field demonstration operation fully show the effectiveness and correctness of the proposed control strategy based on VSG algorithm.

中文翻译：

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基于VSG的光伏发电系统调频控制研究

为了提高新能源发电并网的友好性，新能源光伏（PV）装置等效于电力系统中的同步发电机，而虚拟同步发电机（VSG）控制的PV能量存储互补电网-建立了并网发电系统模型，并对其进行了分析研究。当与电网一起向负载供电时，VSG内部的储能单元将根据PV输出的波动释放并存储电能，这起到了原动机调整的作用；在负载功率波动的情况下，电网根据其容量承担相应的有功功率调节。有功功率调整量，在负载功率波动的情况下，共同维护系统内部的功率平衡。提出了基于VSG算法的光伏并网逆变器的总体系统架构和控制策略。此处提出的PV-VSG不仅考虑了最大功率点跟踪控制，而且还独立参与了电源供应。同步发电机的网络调频调压，惯性阻尼等一系列特性，可以有效地改善新能源光伏发电系统，促进新能源消费。系统仿真和现场演示操作的结果充分证明了所提出的基于VSG算法的控制策略的有效性和正确性。