Constant-current frequency conversion control system for brine pumps of freezing station

Abstract

The invention discloses a constant-current frequency conversion control system for brine pumps of a freezing station. The constant-current frequency conversion control system comprises a computer monitoring unit, frequency conversion control cabinets, brine pump units and detection units. The frequency conversion control cabinets control the brine pump units, the detection units transmit acquired brine flow rate signals to the frequency conversion control cabinets, and output frequencies of frequency converters are controlled by the aid of a PID (proportion, integration and differentiation) control method, so that the rotational speeds of brine motors can be changed, flow rates of brine in pipelines can reach set values, and a constant-current control effect can be realized. The constant-current frequency conversion control system has the advantages that the frequency conversion control cabinets control the brine pump units, the frequency conversion control cabinets and a computer are networked with one another on the basis of PROFIBUS-DP (process field bus-decentralized peripherals) data buses to monitor the brine pumps in a centralized manner, accordingly, the system can effectively carry out data comparison and cooperative control, and networking and centralized control effects can be realized.

Description

technical field [0001] The invention relates to the technical field of a brine circulation system in a freezing station, in particular to a constant-flow variable-frequency control system for a brine pump in a freezing station. Background technique [0002] According to statistics, electric motors consume about 62% of the country's electricity consumption every year. They are not only the first large electricity consumer, but also the user with the greatest energy-saving potential. Among them, the annual power consumption of general motor systems such as fans, pumps, and compressors accounts for 31% of the country's power generation, of which 70% are operated with variable loads. It can be seen that there is great potential for energy-saving speed regulation of fans and pump motors, and the requirements for speed regulation accuracy are not high, so the energy-saving prospect is very broad. [0003] At present, the frozen construction units have the following deficiencies i...

AI Technical Summary

Problems solved by technology

[0007] (d) When the brine pump unit is independently controlled, data comparison and collaborative control cannot be effectively performed, and the function of centralized monitoring with computer networking has not been realized, and the degree of automation is low;

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