Electric automobile charging/discharging/storing integral station power flow three-level converter

Abstract

The invention provides an electric automobile charging / discharging / storing integral station power flow three-level converter. A control part controls the working of circuits at all levels through a grading coordination control strategy, a first-level alternating current (AC) / direct current (DC) circuit alternating side is connected to an electric network, a direct current side is connected to a total direct current bus, the alternating current of the electric network is converted to the stable direct current and is output to the total direct current bus, a second-level DC / DC circuit high-voltage side is connected to the total direct current bus, a low-voltage side is connected to a corresponding branch direct current bus, the direct current of the total direct current bus is converted to finer direct current which can meet charging requirements of different cells and is output to a corresponding branch direct current bus, a third-level DC / DC circuit high-voltage side is connected to a corresponding branch direct current bus, a low-voltage side is connected to a storage battery group, and the storage battery group is controlled to charge / discharge evenly, finely and reasonably. The cell group can charge and discharge evenly, the best charging effect is achieved and the circulation service life of cells is improved.

Description

technical field [0001] The invention relates to a converter, in particular to a power flow three-stage converter for an electric vehicle charge-discharge-storage integrated power station. Background technique [0002] The electric vehicle charging and discharging integrated power station integrates battery charging and discharging, battery replacement and battery energy storage. It is one of the mainstream designs that have attracted much attention in the electric vehicle energy supply platform. Purpose The energy conversion device is a high-tech complex integrating power supply technology, power electronics technology, software technology, and control technology. Its development will inevitably provide considerable market demand for the development of these technologies and promote the development of technologies in related fields. Most of the current battery charging devices adopt a two-stage structure, which is directly composed of AC / DC and DC / DC circuits. Due to the dif...

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Problems solved by technology

Most of the current battery charging devices adopt a two-stage structure, which is directly composed of AC / DC and DC / DC circuits. Due to the different types of rechargeable batteries, the remaining capacity of the battery is different, and the requirements for charging current are also different. Under the same level of DC / DC circuit, it is impossible to achieve reasonable and optimal charging "different from battery to battery", and cannot meet the requirements of refined charging, which greatly affects the balanced charge and discharge efficiency of the battery, and will even affect the cycle life of the battery

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