Unified damping ratio-based damping coefficient adaptive control method of virtual synchronous generator

Abstract

The invention discloses a unified damping ratio-based damping coefficient adaptive control method of a virtual synchronous generator. The method comprises the following steps of (1) simulating primary frequency modulation and the mechanical characteristic of a rotor and obtaining a frequency and a phase of output voltage; (2) detecting real-time power angle information and calculating a damping coefficient according to a designed adaptive damping function to obtain damping power; (3) superposing the damping power to output active power for feedback and calculating an output voltage frequency and a phase instruction of the virtual synchronous generator according to the step (1); and (4) generating a voltage reference value by a voltage amplitude instruction and the phase instruction, and obtaining a control signal of a converter through a voltage closed loop. Compared with an existing method, the virtual synchronous generator can ensure an oscillation suppression effect at different steady state operation points and has relatively good dynamic characteristics; and the anti-interference capability of the frequency is strengthened.

Description

Technical field: [0001] The invention belongs to the field of virtual synchronous generator control, and in particular relates to an adaptive control method for the damping coefficient of a virtual synchronous generator based on a uniform damping ratio. Background technique: [0002] Renewable new energy power generation mainly based on wind power and photovoltaics mainly uses power electronic converters as grid-connected interfaces, which have the advantages of flexible control and quick response, but also have shortcomings such as lack of inertia and damping, especially at present Current converters are often connected to the grid in current source mode, which is significantly different from the synchronous generators used in traditional energy sources in terms of external characteristics. Now, with the continuous improvement of the penetration rate of distributed renewable energy, the rotating reserve capacity and moment of inertia in the power system are relatively reduc...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the constant damping coefficient of the existing virtual synchronous generator technology cannot guarantee that the virtual synchronous generator can achieve ideal dynamic performance at any steady-state operating point, and provides a virtual synchronous generator based on a uniform damping ratio Adaptive Control Method of Damping Coefficient

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