Hybrid micro-grid IC adaptive control strategy based on improved VSG technology

Abstract

The invention relates to a hybrid micro-grid IC adaptive control strategy based on an improved VSG technology, and the strategy is characterized in that the strategy comprises a hybrid micro-grid VSG control principle, an AC / DC hybrid micro-grid adaptive virtual inertia control strategy and an adaptive VSG control algorithm process content. By changing fixed inertia into self-adaptive inertia, the dynamic performance of the system during load fluctuation is improved. Under two operation modes of system rectification and inversion, the inertia of the system is correspondingly increased according to the deviation degree when the frequency deviates from a rated value, and the inertia of the system is correspondingly reduced according to the regression degree when the frequency returns to the rated value. When the voltage waveform generates overshoot, the inertia of the system is correspondingly increased, and the overshoot of the voltage is reduced. The frequency waveform and the voltage waveform in the two operation modes are further optimized, and the effectiveness of the proposed control strategy is verified.

Description

Technical field [0001] The present invention relates to the technical field of decree mixing microgrid, and is an adaptive control policy based on improving VSG technologically, ICs) adaptive control strategies. Background technique [0002] With the gradual depletion of traditional fossil energy, distributed energy is widely developed. The micron grid is an effective means of receiving distributed power supplies, which has become an important way for distributed power grids. However, the single microgrid has a limited work capacity, and the weak anti-disturbance capability is weak. Therefore, the DC mixed microgrid is an important part of the future smart grid due to its effectively avoiding the impact of distributed power supply uncertainty and load random to the power system. However, it is currently widely used in the virtual synchronous generator (VSG) technology in the microgrid, although the inertia lack of inertia can be solved, but the inertia size in the traditional VSG...

AI Technical Summary

Problems solved by technology

However, the virtual synchronous generator (VSG) technology, which is widely used in microgrids, can solve the lack of inertia caused by traditional droop control, but the inertia in the traditional VSG control strategy is a fixed value, and different The required inertia is different under operating conditions, so while this control strategy improves the stability of the system, it ignores the rapidity of system adjustment

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