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Method of controlling bidirectional converter to charge and discharge storage battery

A bidirectional converter and control method technology, applied in battery circuit devices, current collectors, electric vehicles, etc., can solve the problems of complex control strategies and inability to switch smoothly.

Inactive Publication Date: 2014-04-30
北京科诺伟业科技股份有限公司 +2
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of the existing bidirectional converter for the control of battery charge and discharge, which cannot be smoothly switched between various states, and the control strategy is complicated, and propose a dual-loop control suitable for bidirectional converters to charge and discharge batteries method

Method used

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  • Method of controlling bidirectional converter to charge and discharge storage battery
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  • Method of controlling bidirectional converter to charge and discharge storage battery

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0028] Such as figure 1 As shown, the double loop control method of the present invention is specifically as follows:

[0029] The battery voltage and charging and discharging currents are respectively measured by the voltage sensor and current sensor on the DC side of the bidirectional converter. The measured battery voltage and charging and discharging currents are respectively filtered by a DC voltage low-pass filter 101 and a DC current low-pass filter 102. AC three-phase voltage and three-phase current collect the voltage and current values ​​on the low-voltage side of the transformer, that is, the voltage and current values ​​on the side of the bidirectional converter. The three-phase low-voltage side grid voltage is transformed from a three-phase static to a two-phase rotating coordinate to obtain the dq axis voltage u d And u q After the grid phase lock...

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Abstract

Provided is a method of controlling a bidirectional converter to charge and discharge a storage battery. The bidirectional converter adopts a double-loop control method, the inner loop is alternating current loop control, and the outer loop is direct current loop control. The direct current loop control can select direct current voltage outer loop control or direct current outer loop control according to different charging and discharging states of the storage battery; when the storage battery is in a constant current voltage-limiting charging state and a constant current discharging state, the direct current outer loop control and alternating current loop control of the bidirectional converter work simultaneously; when the storage battery is in a constant voltage current-limiting charging state and a floating charging constant-voltage charging state, the direct current voltage outer loop control and alternating current inner loop control of the bidirectional converter work simultaneously; the direct current voltage outer loop control and the direct current outer loop control are switched over smoothly; meanwhile, the bidirectional converter adopts a four-section type intelligent charging control and constant-current discharging control strategy for the storage battery.

Description

Technical field [0001] The invention relates to a method for controlling the charging and discharging of a storage battery by a bidirectional converter. Background technique [0002] The micro-grid system based on distributed power generation is a small grid composed of various micro-sources, energy storage devices, loads, protection and monitoring devices, etc. The micro-grid has various forms of energy input, due to some renewable energy sources such as solar energy and wind energy. It has obvious intermittent and random characteristics, and the load also changes randomly. The distributed energy storage link has become an indispensable part of supporting the autonomous operation of the microgrid and the networked operation of the controllable unit. Maintain the balance of supply and demand and support voltage / frequency stability during island operation. [0003] The main function and function of the bidirectional converter is to realize the two-way transfer of energy between the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
Inventor 高俊娥王永超王一波吕佃顺林资旭李海东郭金东赵栋利曹笃峰许洪华
Owner 北京科诺伟业科技股份有限公司
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