A low-temperature start-up method for a wind power converter

Abstract

The invention discloses a low-temperature starting method for a wind power current transformer. A fan main controller is directly connected with the non-ready port of the current transformer. The method comprises the following steps of: after the current transformer is powered up, detecting and judging temperature and humidity of a current transformer control cabinet, if the temperature is higher than 0 degree, and the humidity is less than an upper limit of safe working humidity, an uninterrupted power supply (UPS) of a system is powered up and self-locked, and a control system is powered up, otherwise, a heating contactor of the control cabinet is closed, so that a normally open contact of the heating contactor cuts off the UPS, and continuing to detect and judge the temperature and the humidity of the control cabinet; then detecting and judging temperature of a current transformer power cabinet, if the temperature is higher than 0 degree, the non-ready port outputs a ready signal, and the control system controls a power cabinet heating device to perform t1-t2 hysteretic heating, otherwise, and the non-ready port outputs a non-ready signal, the control system controls the power cabinet to heat, and continuing to detect and judge the temperature of the power cabinet; and controlling the current transformer to start and work by the fan main controller. According to the low-temperature starting method, the wind power current transformer is ensured to be well heated and work reliably, the heating awaiting time of a wind power generator set is shortened, and the power generation amount is increased; and the low-temperature starting method is simple and reliable, and is convenient to implement.

Description

technical field [0001] The invention relates to a start-up method for a converter in a wind power generation system. Background technique [0002] In the low temperature environment in winter in the north, the converters used in wind farms may cause damage to the converters when they are started at low temperatures (beyond the operating temperature range of the converters). Therefore, the converters need to be heated. Make the converter start up and work within the safe operating temperature range. [0003] However, when the current converter is heated at a low temperature, the auxiliary contact signal (or related signal) of the heating contactor is fed back to the main controller, so that the main controller detects that the converter is in a heating state and cannot be started. [0004] The low-temperature start-up control circuit diagram of a certain type of converter is as follows: figure 1 As shown, the power cabinet heating feedback contact K1 is set between the conv...

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a low-temperature start-up method for a wind power converter, which overcomes the problem in the prior art that the converter still feeds back the heating state signal to the main controller when the converter is in the working temperature range, causing the converter to fail. In the safe working temperature range, the machine cannot be started, and the wind power system takes a long time to start, which reduces the power generation efficiency of the wind power system.

Images