虚拟同步发电机二阶和五阶模型对比研究

Comparative Study on Second-and Fifth-Order Models of Virtual Synchronous Generators

虚拟同步发电机由于可模拟同步发电机的下垂特性和转动惯性,受到广泛关注和研究。针对不同的本体模型作了理论对比分析,二阶方程在模拟同步发电机电气特性的同时,还可发挥逆变器控制中虚拟阻抗的作用;五阶方程虽可更详尽地模拟同步发电机的暂态过程,但参数相对较多,设计复杂,并且控制环路中无电流环,并网电流的电能质量受到严重影响,利用小功率试验验证了二阶方程的优越性。

Virtual synchronous generators are widely concerned and studied because they can simulate the droop characteristics and rotational inertia of synchronous generators. This research made theoretical comparative a- nalysis for different ontology models. The second-order equation can also play the role of virtual impedance in inverter control while simulating the electrical characteristics of synchronous generators. Although fifth-order equation can simulate the transient process of synchronous generators more fully, but it requires more parame- ters and complex design, and there is no current loop in the control loop, and the power quality in grid current is severely affected. The advantage of the second-order equation is proved by the small power test.