Automatic control method of cooling capacity of outer cooling unit

Abstract

The invention discloses an automatic control method of the cooling capacity of an outer cooling unit. The outer cooling unit comprises M variable-frequency draught fans and N power frequency draught fans. The variable-frequency draught fans and the power frequency draught fans are controlled by logical circuits to be started or stopped. The automatic control method comprises the starting step and the stopping step; in the starting step, a valve inlet water temperature is compared with a valve inlet preferred temperature, and when the valve inlet water temperature is higher than the valve inlet preferred temperature, the variable-frequency draught fans and the power frequency draught fans are started through the logic circuits; and in the stopping step, the valve inlet water temperature is compared with the valve inlet preferred temperature, and when the valve inlet water temperature is lower than the valve inlet preferred temperature, the variable-frequency draught fans and the power frequency draught fans are stopped through the logic circuits. According to the automatic control method of the cooling capacity of the outer cooling unit, through the start and stop control over the M variable-frequency draught fans and the N power frequency draught fans and the comparison between the real-time water temperature and the valve inlet preferred temperature, the outer cooling heat exchange capacity is adjusted; and in this way, the power consumption is lowered, smooth adjustment of the outer cooling heat exchange capacity is guaranteed, and the adjustment amplitude of the outer cooling capacity is optimized.

Description

technical field [0001] The invention relates to an automatic control method for the cooling capacity of an external cooling fan unit, belonging to the technical field of air cooling. Background technique [0002] The electric power industry currently has many electrical equipment composed of high-power power electronic semiconductor components, such as thyristor converter valves and IGBT converter valves, which are widely used in engineering fields such as direct current transmission. A closed circulating water cooling system is required to cool semiconductor components, and the closed water cooling system is usually water (inner)-water (outer) heat exchange or water (inner)-air (outer) heat exchange. In the water-air heat exchange process, due to the large amount of heat exchange required, multiple sets of external cooling fans are usually configured to cool the internal water. At the same time, due to the constant changes in the heat generated by the cooled semiconductor ...

AI Technical Summary

Problems solved by technology

At present, the heat dissipation technology of multiple sets of non-frequency conversion fans is usually used, and the cooling capacity of the water cooling system is controlled by adjusting the start and stop of multiple sets of non-frequency conversion fans. Since the cooling capacity adjustment steps of multiple sets of non-frequency conversion fans are large, it is difficult to accurately adjust the overall cooling of the external cooling system. Capacity, which is not conducive to smooth control of the temperature of the cooled medium, and frequent start and stop of non-variable frequency fans will easily reduce the service life of the fans

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