Energy storage and unloading device of wind power generation system and control method thereof

Abstract

The invention discloses an energy storage and unloading device of a wind power generation system and a control method thereof. The energy storage and unloading device comprises a storage battery, a digital signal processor (DSP), a chopper circuit, a detection circuit I, a detection circuit II, a power drive circuit and a pulse charging and unloading circuit, wherein, the chopper circuit is connected between a direct current (DC) bus of the wind power generation system and the storage battery; one end of the detection circuit I is connected between the DC bus of the wind power generation system and the chopper circuit, and the other end of the detection circuit I is connected with the DSP; one end of the detection circuit II is connected between the chopper circuit and the storage battery, and the other end of the detection circuit II is connected with the DSP; the power drive circuit is connected with the DSP, the chopper circuit and the pulse charging and unloading circuit; and the pulse charging and unloading circuit is connected with the chopper circuit. The energy storage and unloading device has the advantages of long service life and capability of charging and unloading at the same time.

Description

technical field [0001] The invention relates to the field of wind power generation, more specifically to an energy storage and unloading device for a wind power generation system and a control method thereof. Background technique [0002] The independent wind power supply system stores excess electric energy in the battery through the charging controller during operation. When the battery is in a saturated state, the excess electric energy is converted into heat and released through the unloading control box. [0003] The battery of the current independent wind power supply system generally adopts a three-stage charging method, namely constant current, constant voltage and float charging. This charging method is easy to form sulfide crystal salt on the battery plate, and the sulfide crystal salt will affect the electrical contact between the plate and the conductive solution. After the battery is used for a long time, the sulfide crystal salt will make it unable to work norm...

AI Technical Summary

Problems solved by technology

This charging method is easy to form sulfide crystal salt on the battery plate, and the sulfide crystal salt will affect the electrical contact between the plate and the conductive solution. After the battery is used for a long time, the sulfide crystal salt will make it unable to work normally, thereby reducing battery life

[0004] The current battery can also be charged by a pulse charger, and the existing pulse charger lacks a discharge circuit, that is, it cannot be discharged during the charging process. For example, the battery car charger only has the function of charging

Therefore, if the existing pulse charger is applied to the wind power supply system, the electric energy in the storage battery cannot be fed back to the grid controllably, so the existing pulse charging method cannot be applied to the wind power system

In addition, due to the uncertainty of the electric energy generated by the wind power generation system during the power generation process, this is not conducive to the simultaneous pulse charging and unloading of the wind power generation system, which will bring difficulties to the system design and control

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