Abstract
As a large number of converters composed of power electronic devices are connected to the grid, power system has gradually decreased stability. How to increase dynamic response of the converter has become one of the research hotspots. Virtual synchronous generator technology (VSG) can endow the converter with moment of inertia and damping characteristics, thereby enhancing dynamic response, but the traditional VSG technology cannot achieve the optimal control effect. To solve this problem, an adaptive control strategy is proposed, which takes logical combination of system angular velocity and frequency change as the real-time change condition, with exponential function as the change expression. Finally, this paper uses MATLAB / Simulink to compare the method in this paper with several existing typical control strategies.
Highlights
In recent years, distributed power generation technology has attracted much attention
Converters composed of power electronic devices have been widely used, which reduces the inertia of the system as a whole and impacts the dynamic response and stable operation of the system
Some scholars have solved the deficiencies of fuzzy control algorithms by controlling parameter change according to a certain function law [4,5], but the control effect is not ideal due to the failure to make full use of the moment of inertia and damping
Summary
In recent years, distributed power generation technology has attracted much attention Under this background, converters composed of power electronic devices have been widely used, which reduces the inertia of the system as a whole and impacts the dynamic response and stable operation of the system. Aiming at the shortcomings of the existing VSG technology, this paper proposes a control strategy based on exponential function, which makes full use of the influence of the moment of inertia and damping on the system. For its basic principle: Based on the conventional VSG technology, the reasonable change trend of damping and moment of inertia is analyzed under system disturbance, and an adaptive control strategy in gridconnected mode is designed in combination with exponential function. Through simulation comparison with three existing control strategies, it indicates that the strategy of this paper can better maintain system stability
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