Abstract: In order to regulate frequency and voltage of photovoltaic generator flexibly and fast for interconnected system, the grid-connected power control method of the photovoltaic power generation unit and the synchronous generator is analyzed, virtual synchronous generator (VSG) control method with minimum adjustment parameter design is proposed. The least-parameter frequency modulator has a first-order inertia characteristic, which can solve the resonance problem when the two-machine interconnection is connected to the grid. The transient operation of the nonlinear reactance simulation system in the VSG impedance model achieves the accuracy and flexibility of the VSG adjustment during the transient transition of the interconnected system. The simulation results confirm the feasibility and effectiveness of the SVG structure with least regulating parameters.

Key words: Photovoltaic power generation unit, virtual synchronous generator, least regulating parameters, nonlinear reactance 

摘要： 为使双机互联系统中光伏发电具备灵活快速的调频调压能力，分析了光伏发电单元与同步发电机双机互联并网功率控制方法，提出最少调节参数设计的虚拟同步发电机(Virtual Synchronous Generator. VSG)控制方法。最少参数的调频器呈一阶惯性特点，能够解决双机互联并网运行时的共振问题。VSG阻抗模型中的非线性电抗模拟系统的暂态运行，实现互联系统在暂稳态过渡过程中VSG调节的准确度和灵活性。仿真结果验证了最少参数VSG方法的可行性和有效性。

关键词: 光伏发电单元, 虚拟同步发电机, 最少调节参数, 非线性电抗