Centrifugal chiller standby restart control method

Abstract

The invention provides a method for controlling standby restart of a centrifugal-type water cooling unit. The method includes step S1, acquiring running parameters before standby, and comparing the running parameters with preset parameters to determine a standby reason; step S2, when the standby reason is water temperature standby, setting restart target parameters according to an incremental learning algorithm; step S3, controlling restart of the unit according to the restart target parameters. According to the method, when the standby reason is water temperature standby, the restart target parameters are set according to the incremental learning algorithm, and restart of the unit is controlled according to the restart target parameters, so that running load of the unit is enabled to be matched with working conditions, the unit is enabled to run under small-load working conditions, potential safety hazards caused by frequent start and stop of the unit are lowered, and the unit is enabled to be more energy saving. In addition, high-low pressure difference of the unit can be lowered, so that the unit is enabled to be away from a surge area, and potential surge possibility of the unit is lowered.

Description

technical field [0001] The invention relates to the control field of a centrifugal chiller, in particular to a control method for restarting a centrifugal chiller in standby. Background technique [0002] The inherent characteristics of the centrifugal chiller have brought about its large cooling capacity. However, under the condition of small load, it is limited by the surge limit of the centrifugal compressor. In order to ensure the reliable operation of the unit, the unit cannot be unloaded normally, resulting in low water temperature. The unit is in standby at the standby temperature. In the case of no increase in the terminal load, the unit restarts after a period of time, but at this time the unit still cannot adapt to the small load condition, and the standby occurs again, so the cycle of standby and restart occurs, causing the unit to start and stop frequently, causing serious damage to the unit damage. Contents of the invention [0003] The present invention aim...

AI Technical Summary

Problems solved by technology

[0002] The inherent characteristics of the centrifugal chiller have brought about its large cooling capacity. However, under the condition of small load, it is limited by the surge limit of the centrifugal compressor. In order to ensure the reliable operation of the unit, the unit cannot be unloaded normally, resulting in low water temperature. The unit is on standby at the standby temperature

In the case of no increase in the terminal load, the unit restarts after a period of time, but at this time the unit still cannot adapt to the small load condition, and the standby occurs again, so the cycle of standby and restart occurs, causing the unit to start and stop frequently, causing serious damage to the unit damage to

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