Wind turbine generator cooling system capable of reducing water pump fault rate and control method thereof

Abstract

The invention discloses a wind turbine generator cooling system capable of reducing the water pump fault rate and a control method thereof, and belongs to the technical field of auxiliary equipment of a wind power generator set. The system comprises pipelines and a water pump, wherein the pipelines are used for conveying a cooling medium, the pipelines comprise a first pipeline and a second pipeline, and the water pump is connected to the closed first pipeline. In the direction of outputting the cooling medium by the water pump, a temperature sensor and a temperature control valve are sequentially connected to the first pipeline; one end of the second pipeline is connected to the first pipeline, the other end of the second pipeline is connected with the temperature control valve, and the second pipeline is further connected with a heat exchanger; and the cooling system further comprises a third pipeline and a debugging valve connected to the third pipeline, one end of the third pipeline is connected to the second pipeline between the temperature control valve and the heat exchanger, and the other end of the second pipeline is connected to the first pipeline at the output end of the temperature control valve. According to the cooling system, the first pipeline and the heat exchanger can be conducted through opening the debugging valve, so that air in the heat exchanger is discharged, and the fault rate of the water pump is reduced.

Description

technical field [0001] The invention relates to the field of auxiliary equipment of a wind power generating set, in particular to a cooling system of a wind generating set capable of reducing the failure rate of a water pump and a control method thereof. Background technique [0002] The role of the cooling system of the wind turbine: use the water pump to pump the low-temperature cooling medium to the main heat-generating components of the wind turbine. The heat exchanger is forced to exchange heat with the ambient air through the fan, which is converted into a low-temperature cooling medium again, and returns to the inlet of the water pump to complete the circulating heat exchange of the cooling system. [0003] At present, due to the increase in heat dissipation requirements of heat-generating components, in order to improve heat exchange efficiency, models above 3MW (including 3MW) mostly use a heat source-water-air secondary heat exchange cooling system. In order to re...

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Problems solved by technology

However, in the low temperature environment, when the cooling system of the wind turbine is debugged on site, since the heating components are not activated, the temperature rise of the cooling medium is limited, so that the cooling medium bypasses the heat exchanger and returns directly to the water pump, resulting in a large amount of air accumulated in the heat exchanger, which cannot pass through in time. Exhaust valve discharges to the external environment

When the temperature of the cooling medium is higher than the opening temperature of the temperature control valve, the air in the heat exchanger will enter the water pump through the circulation loop of the cooling system. The air is a fatal risk to the mechanical seal of the water pump (hereinafter referred to as the mechanical seal). It usually leads to the failure of the mechanical seal, resulting in the unexpected shutdown of the wind turbine

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