GOLDWIND SCIENCE & TECHNOLOGY CO., LTD.

A zero-sequence current suppression method and device, a converter and a wind turbine are provided. The converter comprises N converter units connected in parallel, N being a positive integer greater than or equal to 2. The zero-sequence current suppression method comprises: obtaining a zero-sequence current in each of N−1 converter units among the N converter units; synchronizing pulse width modulation PWM control signals of all rectifiers in the N converter units and synchronizing PWM control signals of all inverters in the N converter units, to suppress high-frequency components of zero-sequence currents in the N converter units; and performing PI regulation by using the zero-sequence currents of the N−1 converter units and zero-sequence current reference values of the N−1 converter units, to suppress low frequency components of the zero-sequence currents in the N converter units.

A detection method and detection apparatus for a wind driven generator, and a computer-readable storage medium, a computer device and a detection system for executing the method. The method comprises: acquiring corresponding operation data of a wind driven generator within a preset time period; according to the operation data, then determining comprehensive data corresponding to the wind driven generator, wherein the comprehensive data is used for reflecting a continuous operation state of the wind driven generator within the preset time period; and when the comprehensive data exceeds a first data threshold, generating first alarm information corresponding to the wind driven generator, wherein the first alarm information is used for indicating that the wind driven generator is in an abnormal operation state within the preset time period, the abnormal operation state may cause the increase of a fatigue load of a wind driven generator unit, thereby shortening the service life of the unit, the first data threshold is less than a second data threshold, and the second data threshold is used for determining whether the wind driven generator has a fault. In this method, in response to the comprehensive data exceeding the first data threshold, a wind driven generator processing device can generate the first alarm information corresponding to the wind driven generator, such that the problem of a unit being damaged because the wind driven generator operates in an unhealthy operation state can be avoided to a certain extent.

A support apparatus for a shaft system includes a first shaft, a second shaft, and a bearing arranged between the first shaft and the second shaft. The first shaft is sleeved at an outer peripheral side of the second shaft and is able to rotate relative to the second shaft by means of the bearing. The support apparatus includes: shaft end support members, at least a portion of the shaft end support members being rotatably supported in an axial direction at an outer side of a shaft end face of a first end of the second shaft; and connection assemblies. The connection assemblies in the axial direction of the shaft system are used for being connected between a first end of the first shaft and the shaft end support members.

The application provides a method, apparatus and electronic device for monitoring tower clearance. The method for monitoring tower clearance includes: obtaining a distance to an obstacle measured by a laser ranging device; calculating a measured clearance value of each laser based on a first distance of the laser; compensating the measured clearance value of each laser by a preset compensation formula to obtain a compensated clearance value of the laser; comparing a minimum compensated clearance value among N lasers with a preset clearance threshold; and performing safety protection for the wind turbine based on a comparison result.

A control method, apparatus and system for anti-vortex induced vibration of a wind turbine are provided. With the method, it is determined whether the wind turbine enters an anti-vortex induced vibration mode; an anti-vortex induced vibration function and triggering a window period is enabled in response to the wind turbine entering the anti-vortex induced vibration mode; and a blade of the wind turbine is adjusted to a preset anti-vortex induced vibration position in the window period, where the window period indicates a minimum time to complete the anti-vortex induced vibration function.

Provided in the present disclosure are a power-generation performance evaluation method and apparatus for a wind generating set. The power-generation performance evaluation method comprises: acquiring respective historical operation data of a wind generating set within n historical time periods; according to the historical operation data, determining actual capacity coefficients and theoretical capacity coefficients; on the basis of the actual capacity coefficients and the theoretical capacity coefficients, determining historical power-generation performance coefficients, so as to obtain a power generation-performance change trend; and according to the power-generation performance change trend, determining an estimated power-generation performance coefficient within a target future time period.

A high voltage ride through (HVRT) device and method, a wind power converter, and a wind turbine set. The HVRT device comprises: an unloading module ( 200 ), which comprises a brake module ( 220 ) and a first switching element ( 210 ) that form a series connection with one another, and which is configured to discharge energy when a HVRT occurs; a controller ( 100 ), which is configured to detect a direct current (DC) bus voltage so as to control the first switching element ( 210 ) to be turned on when a HVRT occurs and the DC bus voltage is greater than a first threshold and less than or equal to a second threshold, such that the brake module ( 220 ) inputs and discharges energy; and a passive driving circuit ( 400 ), which applies a turn-on signal to a control terminal of the first switching element ( 210 ) by using the DC bus voltage in response to the DC bus voltage being greater than the second threshold, such that the brake module ( 220 ) inputs and discharges energy.

This application discloses a method, device, and apparatus for maintaining a wind turbine generator plant, which relates to the field of wind power generation. The method includes determining a failure of the wind turbine generator plant when the wind turbine generator plant enters a shutdown maintenance mode; determining a maintenance wind speed corresponding to the failure; adjusting one of blades of the wind turbine generator plant to reach a predetermined azimuth angle and lock an impeller of the wind turbine generator plant to maintain the wind turbine generator plant in a case where the failure belongs to a first type of failure and a real-time wind speed obtained is less than or equal to the maintenance wind speed corresponding to the failure, the first type of failure comprising a failure that requires to lock the impeller for maintenance and the predetermined azimuth angle being a different integral multiple of 30°.

A wind turbine generator set, and a control method and apparatus for a wind power converter are provided. The control method includes extracting a super-synchronous oscillation component of a grid-side voltage of a wind power converter and a super-synchronous oscillation component of a grid-side current of the wind power converter. The control method also includes determining a phase angle of equivalent impedance of the wind power converter based on the super-synchronous oscillation component of the grid-side voltage and the super-synchronous oscillation component of the grid-side current. The control method further includes setting an operation mode of the wind power converter based on the super-synchronous oscillation component of the grid-side voltage and/or the super-synchronous oscillation component of the grid-side current, and the phase angle.

A gear speed change device. The gear speed change device comprises a first planetary gear train ( 100 ). The first planetary gear train ( 100 ) comprises a first ring gear ( 101 ), a first planetary carrier ( 102 ), first planetary gears ( 103 ), a solar idle gear ( 104 ), and a planetary idle gear ( 105 ). The planetary idle gear ( 105 ) and the first planetary gears ( 103 ) are all mounted on the first planetary carrier ( 102 ); each first planetary gear ( 103 ) comprises a pinion ( 103 a ) and a large gear ( 103 b ) coaxially connected to the pinion ( 103 a ); the planetary idle gear ( 105 ) and the pinion ( 103 a ) are both engaged with the inside of the first ring gear ( 101 ) and are both engaged with the outside of the solar idle gear ( 104 ); the pinion ( 103 a ) can float along the radial direction thereof relative to the first planetary carrier ( 102 ), and the maximum radial floating amount of the pinion ( 103 a ) is greater than the maximum radial floating amount of the planetary idle gear ( 105 ); and the large gears ( 103 b ) of at least two first planetary gears ( 103 ) are arranged in a staggered manner in the axial direction, and projections thereof on a plane perpendicular to the axial direction overlap with each other. The gear speed change device has a relatively high torque load density, and can give consideration to a small volume, a large transmission speed ratio and a high torque load capability.