There are contradictions between the steady-index and dynamic characteristics of active power responses, when virtual synchronous generator (VSG) is connected to grid as a PQ source. The concept of virtual power was proposed for explaining the physical meaning of the control parameters in this paper. Furthermore, the amplitude-frequency characteristics of virtual power were analyzed and corrected to improve system characteristics, and a general expression of improved VSG control scheme is demonstrated. Afterward, the related control parameters were analyzed and designed for a specific case, and the implement steps were conducted. Finally, the effectiveness of the proposed control method was verified.
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Li et al. (2019) studied this question.
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