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Anti-surge control method and system for magnetically suspended centrifugal air-conditioning unit

A technology for air conditioning units and control methods, which is applied in pump control, refrigerators, refrigeration components, etc., can solve the problems of poor compressor operation reliability, inaccurate control, fault shutdown, etc., to improve stability and reliability, and load stability. Quick adjustment, avoid the effect of surge

Active Publication Date: 2020-12-08
QINGDAO HAIER AIR CONDITIONING ELECTRONICS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For larger refrigerant chillers, multiple compressors are usually installed, and the load control of the compressors is usually assigned by the method of the average value of the total load of the whole machine. This control method may cause the compressor to deviate from its own optimal energy efficiency operating area, or even When there are system protections on the fluorine side of the respective compressors, continuing to assign them uniformly will lead to failure shutdown
Therefore, the current compressor load control method is inaccurate, the reliability of compressor operation is poor, and surge is prone to occur

Method used

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  • Anti-surge control method and system for magnetically suspended centrifugal air-conditioning unit
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  • Anti-surge control method and system for magnetically suspended centrifugal air-conditioning unit

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Embodiment 1

[0069] Embodiment 1. The anti-surge control method of the magnetic levitation centrifugal air conditioner unit of the present embodiment specifically includes the following steps, see figure 2 shown.

[0070] Every set cycle (such as 0.5S), perform the following steps:

[0071] Step S11: Obtain the current actual load of each operating compressor, the actual outlet water temperature Tout, the target outlet water temperature Ta, the total number N of compressors, and the number N1 of operating compressors.

[0072] The current actual load of the running compressor is the percentage of the current actual load of the compressor. The current actual load of the compressor can be obtained through existing technologies, and will not be repeated here. When the compressor is a magnetic levitation centrifugal compressor, the current actual load is the output value of the compressor itself, and the main control board of the air conditioner can directly read it from the communication por...

Embodiment 2

[0158] Embodiment 2. Since the actual load of each operating compressor is different, there may be some compressors with relatively large real-time power and small real-time power of some compressors, resulting in unbalanced unit loads. In order to solve this problem, this embodiment proposes an anti-surge control method for a magnetic levitation centrifugal air-conditioning unit based on the first embodiment.

[0159] The anti-surge control method of the magnetic levitation centrifugal air conditioner unit of the present embodiment specifically includes the following steps, see Figure 4 shown.

[0160] Every set cycle (eg 0.5s), perform the following steps:

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Abstract

The invention discloses a surge-resistant control method and system for a magnetic suspension centrifugal type air conditioner unit. The current actual load of each operating compressor, the actual water discharge temperature, a target water discharge temperature, the total number of compressors and the total number of operating compressors are obtained; the target load of each operating compressor is calculated; according to the calculated target load, the compressors are controlled to operate; in the operating process of the compressors, the surge rotation speed, the actual rotation speed and the locked rotation speed of each operating compressor are collected; when (Rsi-Rci) / (Rdi-Rci) is smaller than or equal to a set value, according to Hi'=loadi+(Rci-Rsi)*K4+K5, a new target load is calculated, and the compressors are controlled to operate according to the new target loads. By the adoption of the surge-resistant control method and system for the magnetic suspension centrifugal type air conditioner unit, independent control over the load of each operating compressor is achieved, control is accurate and flexible, the load of each operating compressor is stably and rapidly adjusted, the compressors are protected against surge, and the operation stability and reliability of the compressors are improved.

Description

technical field [0001] The invention belongs to the technical field of air conditioning, and in particular relates to a method and system for anti-surge control of a magnetic levitation centrifugal air conditioning unit. Background technique [0002] The magnetic levitation centrifugal compressor has been more and more recognized by the market because of its energy-saving performance, and air-conditioning main engine manufacturers have introduced and used it one after another. [0003] For larger refrigerant chillers, multiple compressors are usually installed, and the load control of the compressors is usually assigned by the method of the average value of the total load of the whole machine. This control method may cause the compressor to deviate from its own optimal energy efficiency operating area, or even When there is system protection on the corresponding fluorine side of the respective compressors, continuing to assign them uniformly will lead to failure shutdown. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D27/02F25B49/02
CPCF04D27/0261F25B49/022F25B2400/077
Inventor 隋杰磊王铁伟张捷国德防
Owner QINGDAO HAIER AIR CONDITIONING ELECTRONICS CO LTD
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