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Method for directly driving direct-current power supply of electrolyte circulating pump unit of liquid flow energy storage battery

A liquid flow energy storage battery and DC power supply technology, which is applied in the direction of machine/engine, liquid variable capacity machinery, single motor speed/torque control, etc.

Inactive Publication Date: 2010-12-01
夏嘉琪
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, using a DC-DC converter is not an optimal solution

Method used

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  • Method for directly driving direct-current power supply of electrolyte circulating pump unit of liquid flow energy storage battery
  • Method for directly driving direct-current power supply of electrolyte circulating pump unit of liquid flow energy storage battery

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Embodiment Construction

[0022] refer to figure 1 The electrolyte circulation pump unit (18) is driven by a DC permanent magnet brushless motor (17), and the electric energy stored in the liquid flow energy storage battery system itself directly supplies power to the DC permanent magnet brushless motor (17), without the need for DC-DC converter. The DC permanent magnet brushless motor driver (2) is composed of a control circuit (3) and a drive circuit (4). The speed setter (6), speed comparator (7), deviation amplifier (8), PID control circuit (10), and pulse width modulator (11) in the control circuit (3) are connected in sequence, and the pulse width modulator ( The output of 11) is divided into two roads to be connected with the upper bridge arm preamplifier (14) and the lower bridge arm preamplifier (13) respectively, the output end of the upper bridge arm preamplifier (14) and the lower bridge arm preamplifier The output end of (13) is connected with the upper bridge arm drive circuit (16) and ...

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Abstract

The invention provides a method for directly driving a direct-current power supply of an electrolyte circulating pump unit of a liquid flow energy storage battery. The method drives the electrolyte circulating pump unit by adopting a direct-current permanent magnet brushless motor, and the permanent magnet brushless motor is supplied with power by direct-current power stored in the liquid flow energy storage battery. Because voltages at two ends of a battery stack are greatly fluctuated during charging and discharging, the conventional direct-current permanent magnet brushless motor and a conventional driver are incompetent. The direct-current permanent magnet brushless motor and the driver can be directly connected with a liquid flow energy storage battery system to bear great amplitude fluctuation of the power supply voltage by adopting a current pulse width modulation technique, a voltage branching technique, a PID control technique and a rotational speed closed-loop control technique so that the direct-current permanent magnet brushless motor and the driver still can work normally under the condition that the fluctuation amplitude reaches 80 percent, the output rotational speed thereof is not affected by the power supply voltage fluctuation, and a DC-DC converter can be saved; and the method simplifies the system, reduces equipment investment, reduces power consumption and improves the efficiency.

Description

Technical field [0001] The invention relates to a method for directly driving a DC power supply of a liquid flow energy storage battery electrolyte circulation pump unit, which can ensure that the electrolyte circulation pump unit rotates at a stable speed and works reliably when the DC power supply voltage of the liquid flow energy storage battery fluctuates greatly . It belongs to the field of battery technology. Background technique [0002] The liquid flow energy storage battery electrolyte circulation pump unit pumps the electrolyte from the liquid storage tank and transports it to the battery stack, where an electrochemical reaction occurs in the battery stack, and after the reaction, it flows out of the battery stack and returns to the liquid storage tank to complete a cycle. The battery stack is constantly replenished with fresh electrolyte to ensure the continuous output of the battery stack. Therefore, the electrolyte circulation pump unit is an essential and imp...

Claims

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Application Information

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IPC IPC(8): H02P6/14F04B49/06H02P6/08
Inventor 夏嘉琪
Owner 夏嘉琪
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