Low-cost and ultra long-service life electricity storage system of small wind power generation unit

Abstract

The invention relates to a low-cost and ultra long-service life electricity storage system of a small wind power generation unit, and the system comprises a buffer electricity storage unit consisting of a lithium ion storage battery or a super capacitor and a main electricity storage unit consisting of a lead-acid, nickel-hydrogen or nickel-cadmium storage battery; the buffer electricity storage unit charges and discharges at high frequency; the main electricity storage unit stores high-capacity electricity, so as to charge to the buffer electricity storage unit or meet the load requirements when the buffer electricity storage unit is used up; when the service life of the buffer electricity storage unit is over, a buffer electricity storage area is divided in the main electricity storage unit, the rest part in the main electricity storage unit serves as a main electricity storage area; the capacity of the buffer electricity storage unit is equal to that of the buffer electricity storage area; the process is repeated, until the new main electricity storage area cannot be divided into new buffer electricity storage areas, and the upper limit of the quantity of the buffer electricity storage areas divided from the main electricity storage unit is equal to the ratio of the total capacity of the main electricity storage unit to that of the buffer electricity storage area minus 1. According to the low-cost and ultra long-service life power storage system of the small wind power generation unit, the service life of the small wind power storage system is ultra-long and prolonged, i.e. 3 to 10 times that of existing wind power generation electricity storage systems.

Description

technical field [0001] The invention relates to a low-cost, ultra-long-life electric storage system that needs to be charged and discharged at high frequency, in particular to a low-cost, ultra-long-life small wind power storage system. Background technique [0002] Many small wind power generation devices (100W class) are intermittent energy utilization, and the wind environment changes frequently. Except for the direct connection of some power generation to the grid, many occasions need to be equipped with a power storage system. [0003] The power storage system is one of the core components in the complete system of the wind power generation device. Its life directly affects the life of the whole power generation device. Small wind power generation devices and electrical equipment often have high frequency characteristics, that is, they often need to be charged and discharged. Therefore, the power storage system Must face high-frequency charging and discharging. [000...

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Problems solved by technology

[0010] In order to overcome many problems such as short service life, low primary energy utilization rate of wind energy, short working time in quiet wind period, etc., which are generally faced in the design of storage systems of various small wind power generation devices and have no effective solutions, the present invention It provides a power storage system with a new concept, low cost, long life, and high wind energy primary energy utilization rate. It not only greatly improves the wind energy primary energy utilization rate under the premise of lower cost, but also realizes small wind power generation devices. The super long service life of the power storage system, compared with the traditional power storage design method, the life of the power storage system is increased by 3-10 times

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