Integrated variable-frequency controller for screw machine central air conditioner

Abstract

The invention discloses an integrated variable-frequency controller for a screw machine central air conditioner. The controller is provided with a main loop and a control system integrating a variable-frequency motor controller and a unit controller. The main loop is used for providing matching currents with adjustable frequency so as to control the rotating speed of a motor of a compressor; the unit controller is used for acquiring and analyzing the refrigeration working condition data transmitted by each unit device, fitting a target rotating speed temperature control curve, outputting strategy control information matching the actual working condition, and sending the strategy control information to the variable frequency motor controller; and the variable frequency motor controller is used for further transmitting a motor frequency adjusting signal for the output currents to the main loop according to the received strategy control information so as to adjust the motor rotating speedof the air conditioner compressor and finish the function of adjusting the output frequency. The matching performance, reliability and expandability of unit control and a frequency converter are improved, the unit operation efficiency is greatly improved, the project development period is shortened, and the market response speed is high.

Description

technical field [0001] The invention relates to the field of screw machine central air conditioners, in particular to a highly integrated frequency conversion controller for screw machine central air conditioners. Background technique [0002] With the increase of social demand, the efficiency requirements for central air conditioners are also increasing. In the existing screw machine central air conditioner, the fixed frequency output of the motor is generally adopted, and the control cabinet adopts the star-delta soft start. This kind of driving method has a large start-up impact, the motor speed cannot be adjusted, and the cooling power can only be adjusted mechanically. A large amount of electrical energy is converted into mechanical energy and heat energy, which not only causes a large waste of electrical energy, but also due to the mechanical impact and energy consumption of the system. affect the life of the system. At the same time, since the motor controller and u...

AI Technical Summary

Problems solved by technology

This kind of driving method has a large start-up impact, and the motor speed cannot be adjusted. The cooling power can only be adjusted mechanically. A large amount of electrical energy is converted into mechanical energy and heat energy, which not only causes a large waste of electrical energy, but also because the system is subject to mechanical impact and energy consumption. Temperature rise, Affect system life

At the same time, since the motor controller and unit temperature and pressure controllers are provided by different manufacturers, there are hidden dangers in the compatibility of units with different capacities and the reliability of the control strategy between the controllers. A reliable control strategy greatly prolongs the project development time, affects the timely launch of the project market, and reduces product competitiveness

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