Wind power converter control method and device and a wind power converter

Abstract

The invention provides a wind power converter control method and device and a wind power converter. The control method comprises the steps of controlling a first converter cabinet to pre-charge at a first moment in response to an input command from a main controller of a wind turbine generator; determining whether a first bus voltage reaches a first predetermined threshold or not; when it is determined that the first bus voltage reaches the first predetermined threshold, controlling a first filter capacitor switching circuit breaker to switch on; in response to the input command, controlling asecond converter cabinet to pre-charge at a second moment later than the first moment; determining whether a second bus voltage reaches a second predetermined threshold or not; and when it is determined that the second bus voltage reaches the second predetermined threshold, controlling a second filter capacitor switching circuit breaker to switch on. According to the wind power converter controlmethod and device and the wind power converter, the filter capacitor switching circuit breakers in the two converter cabinets are switched on asynchronously, so that filter capacitor switching protection of the wind power converter is achieved.

Description

technical field [0001] The present invention generally relates to the technical field of wind power, and more specifically, relates to a control method, a control device and a wind power converter for a wind power converter. Background technique [0002] Wind power converter is one of the core components of wind power generation system, which can optimize the operation of wind power generation system and improve the utilization rate of wind energy. Generally, a wind power converter includes two main cabinets and a slave cabinet with identical main circuits. Both the master cabinet and the slave cabinet have filter capacitor switching circuit breakers, and the filter capacitor switching circuit breakers require energy for closing. [0003] The existing wind power converters usually use the following two methods to provide energy for the filter capacitor switching circuit breaker: (1) use an uninterruptible power supply (UPS) to provide electric energy for the filter capacitor...

AI Technical Summary

Problems solved by technology

However, the power of the existing uninterruptible power supply is difficult to start the filter capacitor switching circuit breakers in the master cabinet and the slave cabinet at the same time

Taking the existing 2.5MW wind power converter as an example, the wind power converter uses an uninterruptible power supply (UPS) with a power of 2000Var to simultaneously start two filter capacitor switching circuit breakers with a power of 1800Var, which is likely to cause two filter The capacitor switching circuit breaker cannot be closed normally; (2) The power supply inside the wind power converter provides power to the filter capacitor switching circuit breaker in the master cabinet and the slave cabinet at the same time

However, when complex working conditions such as low voltage ride through occur, the filter capacitor switching circuit breakers in the master cabinet and the slave cabinet cannot be closed normally

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