Frequency conversion control method of compressor unit for natural gas vehicle refueling mother station

Abstract

The present invention discloses a frequency conversion controlling method of natural gas automobile parent gas adding primary station compressor unit, wherein the compressor unit includes a primary station compressor, a asynchronous motor supplied with variable frequency, a transducer, a superior control computer, and cylinder inside the station; the frequency conversion compressor unit control and change rotate speed of the primary station compressor unit at real time according to variation of cistern car pressure under superior control computer command: when the cistern car pressure is low, constant rotate speed runs; when the cistern car pressure high, constant power runs. The present invention can improve average gas adding speed of the primary station, increase daily gas supply, improve economical efficiency of current primary station compressor unit, meanwhile, because the rotate speed is improved, unit power can be utilized relatively great, electric motor efficiency is improved, attrition reduced, and power consumption of unit aerogenesis of the unit decreased with significant energy-saving effect.

Description

technical field [0001] The invention relates to a control method of a compressor unit, in particular to a frequency conversion control method suitable for a compressor unit of a natural gas vehicle refueling mother station. Background technique [0002] As an alternative fuel for urban public transportation and short-distance transportation, compressed natural gas has been more and more widely used in China. In many places where there is no local gas source, it is necessary to develop a mother-child station model: set up a mother station at the opening of the main natural gas pipeline, compress the pipeline natural gas to 20MPa and fill it into the gas storage cylinder group on the tanker, and then transfer it by the tanker Go to the sub-station in the city; at the sub-station, the tanker uses the equipment of the sub-station to refuel the gas-consuming vehicles, and when the pressure in the bottle group of the tanker is relieved to 2MPa, it returns to the parent station for...

AI Technical Summary

Problems solved by technology

Clearly, this is inconsistent with the need for increased refueling capacity from the mother station compressor

[0005] On the other hand, the compressor at the mother station is the main energy-consuming equipment in the operation of the mother station. The motor runs for a long time away from the design conditions, and the efficiency and performance of the motor decrease

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