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A method for controlling the safe charge and discharge of an all-vanadium redox flow battery containing a dc/dc converter

An all-vanadium redox flow battery and control method technology, applied in the field of battery energy storage charge and discharge control, can solve the problems of permanent damage, endanger the safe and stable operation of the energy storage system, affect the service life of the battery, etc. The effect of overcharging the battery and preventing battery damage

Inactive Publication Date: 2014-10-15
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once the state of charge of the battery or the external terminal voltage exceeds the acceptable limit, it will seriously affect the service life of the battery or cause permanent damage, thus endangering the safe and stable operation of the entire energy storage system

Method used

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  • A method for controlling the safe charge and discharge of an all-vanadium redox flow battery containing a dc/dc converter
  • A method for controlling the safe charge and discharge of an all-vanadium redox flow battery containing a dc/dc converter
  • A method for controlling the safe charge and discharge of an all-vanadium redox flow battery containing a dc/dc converter

Examples

Experimental program
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Embodiment 1

[0031] figure 1 It is a charge and discharge control block diagram of an all-vanadium redox flow battery connected to a bidirectional DC / DC converter, as shown in the figure: a control method for safe charge and discharge of an all-vanadium redox flow battery containing a DC / DC converter provided by the present invention, Include the following steps:

[0032] S1: Detect the actual voltage signal U of the external terminal of VRB b , the actual current signal I of the VRB side inductor L ;

[0033] S2: The detected actual voltage signal U of the external terminal of VRB b and VRB side inductor actual current signal I L Multiply to get the actual electric power signal P of VRB battery ;

[0034] S3: Set the power setting value Pref , Current setting value I ref , Voltage setting value U ref Respectively with VRB actual electric power signal P battery , Actual current signal I L , the actual voltage signal U b Make a difference, input the difference into the charging a...

Embodiment 2

[0049] The difference between this embodiment and embodiment 1 is only:

[0050] Such as figure 1 As shown, the device in the embodiment provided by the present invention includes a charge-discharge switching module, a PWM generator, a proportional integrator PI, a bidirectional DC / DC converter provided with an IGBT circuit, and a plurality of series-connected VRB groups, cascaded Complementary PWM bidirectional DC / DC converter, in which the DC / DC converter adopts a double closed-loop control strategy in which the inner loop is the average current control of the VRB side inductor, and the outer loop is constant power, constant current and constant voltage switching control. The voltage signal U of the external terminal of VRB is detected by the voltage and current sensors respectively. b and VRB side inductor average current signal I L , and then get the actual charging and discharging power signal P of the battery battery for:

[0051] P battety =U b × I L (1)

[...

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Abstract

The invention provides a safe charge-discharge control method of an all-vanadium redox flow battery (VRB) comprising a direct current / direct current (DC / DC) converter. According to the control method, the VRB group cascade bi-directional DC / DC converter is adopted as a charge-discharge port, wherein an inner ring of the DC / DC converter is controlled by a VRB side inductor average current, an outer ring of the DC / DC converter is a double closed-loop strategy which is constant in power, constant in voltage, and controlled by trickle switch, and a corresponding three-stage safe charge-discharge control mode is proposed with the state of charge (SOC) of the VRB and the terminal voltage limiting value as constraint condition. According to the control method, the safe charge-discharge control mode of the battery comprising the converter is considered, flexible safe charge-discharge control mode switch can be achieved by controlling the DC / DC converter, phenomena of over-charging and over-discharging of the battery are effectively prevented by means of the stage type charge-discharge control method, and damage of the battery caused by over-high charging voltage or over-low discharging voltage is prevented.

Description

technical field [0001] The invention belongs to the technical field of battery energy storage charge and discharge control, and in particular relates to a method for controlling the safe charge and discharge of an all-vanadium redox flow battery containing a DC / DC converter, specifically including considering the state of charge of the all-vanadium redox flow battery and the terminal voltage limit A control method for safe charging and discharging switching modes under value constraints. Background technique [0002] With the integration of large-scale intermittent energy into the grid, its unique volatility and randomness have an impact on the safe and stable operation of the grid, and energy storage technology is one of the effective means to solve these problems. Among them, the electrochemical energy storage method is widely used, but in actual operation, the energy exchange between the battery and the load is carried out through the converter, and its control method dir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00
Inventor 李辉付博杨超秦星陈耀君季海婷何蓓
Owner CHONGQING UNIV
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