Wind turbine generator microgrid operation virtual inertial control system based on virtual synchronous generator technique and wind turbine generator microgrid operation virtual inertial control method based on virtual synchronous generator technique

Abstract

The invention discloses a wind turbine generator microgrid operation virtual inertial control system based on a virtual synchronous generator technique and a wind turbine generator microgrid operation virtual inertial control method based on virtual synchronous generator technique. A conventional achievement of a virtual synchronous generator technique is adopted, virtual inertia of a fan set, virtual inertia of an energy storage device and VSG (Voltage Sag Generator) inertia response are mutually matched by adding a sag characteristic and designing an energy storage device self-control algorithm and a power setting module, and the problems that a virtual inertia algorithm is coupled with a maximum wind energy tracking algorithm and is hard to compatible with an energy storage algorithm are effectively solved. By adopting the system, various sudden air speed and load variations can be effectively solved, the frequency discontinuity amplitude of an alternative-current side is limited, the self-adjusting capability of a micro network system is improved, and the contribution of an air wind electric field to source network load system stability and frequency adjustment is improved. In addition, measures of speed increase or decrease are not needed in advance, no pitch angle control is needed, and the utilization rate of an energy storage device and the utilization rate of wind energy are effectively increased.

Description

technical field [0001] The invention relates to a virtual inertia control method for a distributed microgrid system, in particular to a virtual inertial control method and system for wind turbine microgrid operation based on virtual synchronous generator technology, and belongs to the technical field of distributed power generation microgrids. Background technique [0002] With the rapid development of distributed power supply and micro-grid technology, new energy power generation technology not only needs to face the technical problems of energy and power generation itself, but also needs to comprehensively consider the overall structure of the source-grid-load system and its response and performance in all aspects. In recent years, the development and utilization rate of renewable energy has continued to rise, the intermittence, volatility, and particularity of energy, and the diversity and dynamics of user loads, as well as the extensive access of new loads such as electri...

AI Technical Summary

Problems solved by technology

When the AC load changes suddenly, the sudden change in power caused by the sudden load change is all borne by the synchronous generator and the grid, causing the AC side frequency to drop, threatening the stability of the microgrid system, the synchronous generator and the grid

However, the output power of the fan unit is constant and will not respond to sudden load changes, making almost no contribution to the frequency regulation of the AC side.

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