Method for starting compressor of variable frequency air conditioner and compensating low-frequency torque

A technology of frequency conversion air conditioner and torque compensation, which is applied in the direction of controlling electromechanical brakes, controlling electromechanical transmission devices, controlling generators, etc., and can solve problems such as soft start of variable frequency air conditioner compressors and low frequency torque ripple

Inactive Publication Date: 2013-09-04
CENT SOUTH UNIV
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Problems solved by technology

[0005] In order to solve the problems of soft start and low-frequency torque pulsation of the frequency conversion air conditioner compressor, the present invention proposes a method for solving the start-up and low frequency torque compensation of the frequency conversion air conditioner compressor

Method used

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  • Method for starting compressor of variable frequency air conditioner and compensating low-frequency torque
  • Method for starting compressor of variable frequency air conditioner and compensating low-frequency torque
  • Method for starting compressor of variable frequency air conditioner and compensating low-frequency torque

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Embodiment 1

[0041]First of all, regardless of the initial operating frequency sent by the control command is xHz (5≤x≤120), the compressor must first run to 40Hz, stay for 10s and then run to the set frequency point. The starting current and speed control curves of inverter air conditioner compressor are as follows: figure 2 As shown, when the control command is issued, the compressor starts open-loop, which is divided into the following two parts:

[0042] (α) It is stipulated that the starting speed of the motor starts from 0Hz and takes 1(8KHz)s as the cycle, and the following formula is the step size increase:

[0043] Speed _ inc = speed _ max × K s × p T _ speed max × n ...

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Abstract

The invention discloses a method for starting a compressor of a variable frequency air conditioner and compensating low-frequency torque. The method for starting the compressor of the variable frequency air conditioner and compensating the low-frequency torque comprises the two steps of starting the compressor of the variable frequency air conditioner and compensating the low-frequency torque. After the compressor of the variable frequency air conditioner is started, the compressor starts operating in an open-loop state. At the time of starting of the compressor, an initial speed with a certain step size and an initial starting current with a certain step size are provided until the compressor is started. A compensation strategy is determined according to the range of variance difference values which are worked out after the compressor is successfully started. According to the method for starting the compressor of the variable frequency air conditioner and compensating the low-frequency torque, successful starting of the compressor is achieved, switching between an open-loop strategy and a closed-loop strategy is soft switching so that impact of the large starting voltage and the large starting current on a controlling chip is avoided; the service life of the controlling chip is prolonged; the success rate of starting is larger than 99.99%; the starting time is controlled to be around 500ms. The method for starting the compressor of the variable frequency air conditioner and compensating the low-frequency torque avoids the limitation of feed-forward table look-up compensation control, and is applicable to various compressors and capable of achieving 5-40Hz long stable operation of the variable frequency air conditioner.

Description

technical field [0001] The invention relates to a method for starting a variable frequency air conditioner compressor and a method for compensating low-frequency torque. Specifically, the present invention relates to a method for efficiently starting a variable frequency air conditioner compressor and a method for compensating low frequency torque after the compressor is successfully started. Background technique [0002] In the existing methods for starting the inverter air conditioner compressor, the starting method of the compressor is usually within a specified time, given a space voltage vector with a certain amplitude and a certain angle of the compressor rotor, although it can be achieved under the force of a strong pull It starts successfully, but when the compressor is started, such a voltage vector is given to the control chip, which is equivalent to receiving a pulse voltage impact, and long-term operation will definitely shorten the service life of the controller....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P21/14H02P25/02H02P6/21H02P27/12
Inventor 陈宁桂卫华阳春华张跃郭宇骞刘波孙尧钟志平
Owner CENT SOUTH UNIV
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