Vanadium redox flow battery control system based on PLC, control method and control device thereof

Abstract

The present invention provides a vanadium redox flow battery control system based on PLC. The control system comprises a vanadium redox flow battery process system and a control cabinet. The control cabinet comprises an alternating current power supply configuration unit, a direct current power supply configuration unit, an ion concentration measurement unit, a man-machine interface unit, a control unit, a signal transmission module group and a power frequency conversion unit. According to the present invention, a power supply circuit of the control system, a PLC module group, a I/O module group, the signal transmission module group and the power frequency conversion unit are grouped and independently designed so as to realize the hot redundancy of the whole system, and greatly improve the stability and the reliability of the system. The system has a plurality of operating modes and an external four-circuit alternating current power supply, such that the charging and the discharging of the vanadium redox flow battery can be performed at any time and any place, the operation is convenient and the application is flexible; the system further has functions of self-diagnostic and self-recovery, such that the misjudgment and the missed judgment of the failure are effectively avoided, the reliability and the availability of the system are improved so as to indeed realize unattended operation; in addition, with the man-machine interface, the related parameters can be monitored and adjusted so as to meet the requirements of various operating conditions.

Description

【Technical field】 [0001] The invention belongs to the technical field of vanadium redox flow batteries, and in particular relates to a PLC-based vanadium redox flow battery control system and control method, and a control device for the vanadium redox flow battery system. 【Background technique】 [0002] At present, the vanadium redox flow battery is one of the latest technologies in the field of large-capacity batteries. It needs to rely on the power of the circulating pump to operate and monitor some key parameters. However, these traditional circulation pump control systems basically use relays as the main control components, and a logic control unit composed of dozens of various types of relays, contactors, switches, buttons and wiring to control the circulation pump, and the process system circulation pump The number of typical configurations is one positive and one negative, instead of multiple circulating pumps to form a circulating pump group. This type of control sys...

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Problems solved by technology

However, these traditional circulation pump control systems basically use relays as the main control components, and a logic control unit composed of dozens of various types of relays, contactors, switches, buttons and wiring to control the circulation pump, and the process system circulation pump The number of typical configurations is one positive and one negative, instead of multiple circulating pumps to form a circulating pump group. This type of control system has the following problems: (1) Since the control system contains a large number of relays, contactor components and their connections Line, in the work project, the frequent start / stop of relays and contactors can easily cause damage and eventually lead to failure to work normally. The stability and reliability of the control system are poor. The cause of the failure is difficult and the maintenance is difficult, which seriously affects the safe operation of the process system; (2) This type of control method can only perform some simple sequential control on the start / stop of the pump, and the function is single, and it is difficult to realize some special processes of vanadium redox flow batteries. The adjustment of the necessary parameters cannot be well adapted to the requirements of various operating conditions; (3) This type of control system does not have visual operation prompts, the operation control is complicated, and the processing speed is slow, especially the state transition time is long , greatly resulting in low work efficiency; (4) This type of control system does not have a flexible remote monitoring method, and it is difficult to realize remote monitoring and remote maintenance; (5) This type of control system does not have automatic fault diagnosis and recovery functions, and it is difficult to avoid faults Misjudgment and missed judgment make the system reliability low and it is difficult to realize unattended

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