VSG Control Strategy Based on Improved Damping Control
Traditional virtual synchronous generator(VSG)control strategies have many issues in suppress-ing power and frequency oscillations under various operating conditions and regulating dynamic performance.By analyzing the system transfer function,this paper described some control problems of traditional VSG,such as the difficulty in coordinat-ing power oscillation suppression and response time,frequency steady-state deviation caused by droop control,and the contradiction between the slow adjustment requirement of frequen-cy characteristics and the damping requirement for damping size and output power.Therefore,an improved damping control strategy for VSG was proposed,which added a damping loop to the power-frequency control-ler.Through theoretical analysis using transfer functions,this paper provided a detailed description of how to solve the control contradictions in traditional VSG control strategies.Finally,simulation systems were used to simulate scenarios such as changes in power reference values and grid fre-quency reduction.The systems with the improved VSG control strategy can effectively achieve the control objectives.
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