Abstract: A medium conveying and heat exchange device and a vortex flow separator for an iron core of an electromagnetic device is provided. The vortex flow separator includes a jet pipe and a vortex flow separation pipe, the vortex flow separation pipe includes a vortex flow chamber, a cold end pipe section and a hot end pipe section. Compressed airflow flows through the jet pipe to form spiral airflow and flow into the vortex flow chamber in a tangential direction thereof. A valve having a cone-shaped surface is arranged inside the hot end pipe section, central airflow of the spiral airflow passes by the cone-shaped surface of the valve and flows back, and is cooled to become cold airflow, and then flows out from the cold end pipe section, to serve as cooling and drying airflow of the input electromagnetic device.

Abstract: A method and a system for controlling a wind turbine based on sectors. Original sectors of the wind turbine are reconstructed based on a wind resource parameter and a wake-flow effect. A load is calculated and superposed for a new sector obtained from the sector reconstruction. An optimization algorithm is applied, under a condition that a constraint condition of a fatigue load is met, to find an operation parameter for maximum power generation amount of the wind turbine.

Abstract: A method and device for determining a tower clearance of a wind turbine. The method includes: acquiring an image of a wind turbine in operation (S10), the image comprising the tips of blades (2) and a tower (1) of the wind turbine; determining the positions of the tips of the blades (2) of the wind turbine in the image acquired (S20); identifying the edges of the tower (1) in the image acquired (30); and calculating, on the basis of the positions of the tips of the blades (2) and the edges of the tower (1) that have been determined, the distance from the tips (2) of the blades (2) to the edges of the tower (1) to acquire a tower clearance (S40).

Abstract: An electrical connector includes a main body portion, connection portions, a first temperature sensing element and a second temperature sensing element. The connection portions allow the main body portion to be electrically connected to a charged element provided in a flow channel. The main body portion includes a first side and a second side which are parallel to a flow direction of fluid. The first temperature sensing element and the second temperature sensing element are provided at mutually opposite positions on the first side and the second side in an electrically insulated manner. A fluid state test device having the electrical connector and a fluid heat exchange system are further provided. Thus, the original flow field where the electrical connector of the electrode of the electric heater is located may not change, and destruction to the flow field is avoided.

Abstract: A wind power generation apparatus, a tower and a method for suppressing a tower shadow effect of the tower. The tower is provided with suction through holes extending through a circumferential wall thereof, and the suction through holes are distributed in a circumferential direction of the tower; the tower is further provided with a suction apparatus, and the suction apparatus can perform suction to the suction through holes from outside to inside. With the tower and the method, when the suction through holes at a windward side are suctioned, the adverse influence of the tower shadow effect can be weakened or eliminated, a service life of a pitch varying bearing can be prolonged, a noise can be reduced and a wind energy utilization coefficient can be improved. When the suction through holes at a position of a bypassing flow detachment are suctioned, vortex-induced vibrations can also be suppressed.

Abstract: A damper and a load-bearing enclosure having the damper are provided. The damper includes a housing forming a containing cavity and a vibration energy dissipation unit located inside the housing, and the containing cavity includes a liquid storage cavity and a mass body movement cavity located at an upper part of the liquid storage cavity; the vibration energy dissipation unit includes a damping liquid contained in the liquid storage cavity and a plurality of mass bodies located inside the mass body movement cavity; and the mass bodies float on the liquid level of the damping liquid, and an outer surface of the mass body is formed with a plurality of toothed projections for breaking waves formed in the damping liquid due to vibration and dispersing the waves in different directions.

Abstract: A method and a device for detecting an active power of a wind turbine. The method includes: acquiring a current rotation speed of a rotor of a wind turbine and a current outputted active power; determining an effective wind speed of the wind turbine; determining a maximum active power capable to be captured by the wind turbine at the current rotation speed; determining a maximum active power capable to be outputted by the wind turbine, and determining a release power at which the wind turbine is capable to release a rotation kinetic energy of the wind turbine for a predetermined time at the current rotation speed; and determining the available active power of the wind turbine, based on the maximum active power capable to be outputted, the release power, and the current outputted active power.

Abstract: A stator assembly, an electric machine and a wind turbine having the stator assembly are provided. The stator assembly includes a stator iron core, a stator bracket supporting the stator iron core, and an air flow conveyer configured to convey a first cold air flow along the radial direction of the stator iron core to a radial side surface of the stator iron core opposite to an air gap side. The embodiment of the present disclosure enables two radial sides of the stator to be cooled at the same time. Thereby, the expansion and deformation of the stator iron core are reduced, the air gap is prevented from being narrowed, magnetic poles are protected from being baked by the high temperature of the stator, and the service life of the electric machine is prolonged.

Abstract: This application provides a control method and device for avoiding run-away, and a wind turbine. The method may include: determining whether a brake system of the wind turbine has failed; if the brake system has failed, calculating an initial crosswind position based on a current wind direction angle, and enabling a yaw system of the wind turbine to perform a crosswind operation based on the initial crosswind position; performing a long-period and short-period filter processing on wind direction data acquired during a crosswind process to obtain an average and instantaneous wind direction angle respectively; determining whether a wind direction has a sudden change based on the average and instantaneous wind direction angle; and if the wind direction has a sudden change, calculating a new crosswind position based on the average wind direction angle, and enabling the yaw system to perform a crosswind operation based on the new crosswind position.

Abstract: A pitch varying device, a pitch varying method and a pitch varying control device for a wind turbine blade and a wind turbine are provided. The blade pitch varying device includes: a disc-type driving structure perpendicular to an axis of a pitch bearing, a track surrounding the axis of the pitch bearing being provided on the disc-type driving structure; a first linear telescopic driving mechanism connected to the track through a first clamping member capable of clamping the track, and the first linear telescopic driving mechanism and the first clamping member being connected through a hinge connection; and a second linear telescopic driving mechanism connected to the track through a second clamping member capable of clamping the track, and the second linear telescopic driving mechanism and the second clamping member being connected through a hinge connection.

Abstract: An electric power transmission carrier and a manufacturing method of the electric power transmission carrier and an enclosure are provided. The electric power transmission carrier includes an enclosure and an electric power transmission cable mounted on the enclosure. The electric power transmission cable is in direct or indirect surface contact with an inner wall of the enclosure, and the enclosure functions as a heat sink of the electric power transmission cable. In the present application, the electric power transmission cable or the conductor is mounted on the enclosure such as a tower barrel or a high tower, to perform electric power transmission and take the enclosure as a heat sink. The electric power transmission component takes the enclosure, the “heat sink” having a huge thermal capacity, as a “cold source”.

Abstract: The present application relates to a rotor, an assembly method and a replacement method for integrated magnetic pole modules of rotor, and a generator. The rotor includes: a rotor yoke having a mounting surface and an outer peripheral surface which are opposite to each other in a radial direction; multiple beads, which are distributed and spaced apart on the mounting surface along a circumferential direction of the rotor yoke, in which a radial distance between each bead and the mounting surface is adjustable; multiple integrated magnetic pole modules, each of which is detachably connected between two adjacent beads, and includes a carrier plate and multiple permanent magnets arranged on the carrier plate; and multiple fixing members, in which each of the beads is mounted to the mounting surface by the fixing members, and each of the fixing members has an operation portion that can protrude from the outer peripheral surface.

Abstract: A method and an apparatus for controlling wind turbine power. The method includes: determining a compensation value for target active power based on a power difference between a net grid-connected power and the target active power; determining a setpoint value of active power based on the target active power and the compensation value; and performing a current-varying control and a pitch control based on the setpoint value of active power.

Abstract: A bolt sleeve connector, a blade of a wind turbine generator system and manufacturing method thereof and a wind turbine generator system are provided. The bolt sleeve connector includes at least two extension portions arranged side by side and spaced apart, and each extension portion has a first end and a second end. The first ends of the extension portions are connected together and the second end of each extension portion is connected with the corresponding bolt sleeve. By using the bolt sleeve connectors to connect multiple pre-embedded connection sleeves at the position of the blade root of the blade of the wind turbine generator system, the multiple pre-embedded connection sleeves are connected as a whole, thus can disperse the stress of the bolt and the bolt sleeve and then improve the bearing capacity of the blade root bolt and facilitate reducing the weight of the blade root.

Abstract: Provided is a pitch apparatus of a wind turbine. The wind turbine includes a wheel hub and multiple blades. The pitch apparatus includes a pitch bearing, a transmission element and a driving mechanism for driving the transmission element. The pitch bearing includes a bearing inner race and a bearing outer race. The bearing inner race is fixedly connected to the blade; the bearing outer race is fixedly connected to the wheel hub. The transmission element is driven by the driving mechanism, and drives the blade and the bearing inner race to rotate relative to the wheel hub. A load level of ultimate bending moment for a blade root and a safety factor of the pitch apparatus increase, failure risks of the pitch bearing, bolts and the transmission belt are reduced. A wind turbine having pitch apparatus is provided.

Abstract: A streamlined body, apparatus for suppressing vibrations of an enclosure, and a method for hoisting a tower are provided. The streamlined body surrounds the enclosure, and the streamlined body has a streamlined leading edge. The leading edge can faces towards the upwind incoming flow, to allow the upwind incoming flow to form a positive attack angle or a negative attack angle. In this solution, the enclosure is surrounded by the streamlined body, and when the upwind incoming flow flows around the enclosure to come into contact with the streamlined body, the aerodynamic configuration is changed, and the aerodynamic coefficient becomes small, thus the vibrations are reduced. Moreover, the direction and path of the airflow are changed, which disrupts the correlation of the upwind incoming flow near the streamlined body, and disrupts the consistence of frequencies of vortex shedding of the airflow at the streamlined body and other positions.

Abstract: A feedforward control method for a wind turbine set in a wind farm, comprising: obtaining real-time operation data of a predetermined wind turbine set in a wind farm; inputting the acquired real-time operation data into a predetermined prediction model corresponding to the predetermined wind turbine set so as to acquire prediction data by means of the predetermined prediction model; according to the acquired prediction data, determining whether to start a feedforward control function for the predetermined wind turbine set so as to control the operation state of the predetermined wind turbine set on the basis of a predetermined manner of feedforward control. The method may control a wind turbine set in advance and is beneficial in the safe operation of wind turbine sets. The present invention also relates to a feedforward control device for a wind turbine set in a wind farm, a control system, a computer readable storage medium and a field group controller.

Abstract: The present disclosure discloses a method and apparatus for detecting a short-circuit capacity at a grid connection point of a wind turbine. The method includes: modulating, when a converter is in a grid-side no-load modulation state and a power grid is in a short-circuited state with respect to the converter, a reactive power reference value and a braking power reference value of the converter; collecting a modulated three-phase voltage signal and a modulated three-phase current signal at the grid connection point of the wind turbine; and obtaining, according to the modulated three-phase voltage signal and the modulated three-phase current signal at the grid connection point of the wind turbine as well as a rated line voltage at the grid connection point of the wind turbine, the short-circuit capacity at the grid connection point of the wind turbine.

Abstract: A subsynchronous oscillation suppression method and an apparatus and a controller of a converter are provided in the present disclosure, the controller is for controlling the converter. The method includes: acquiring an electric energy fluctuation parameter generated by a subsynchronous oscillation of a power transmission system; acquiring a compensation parameter of a current setting for an active axis according to the electric energy fluctuation parameter; controlling the converter to suppress the subsynchronous oscillation according to the compensation parameter of the current setting for the active axis.

Abstract: A method and apparatus for monitoring formation of ice on a wind turbine blade are provided. The method includes: capturing an image of the blade through a camera; detecting a region of the blade from the captured image; clearing image information of a background region from the captured image, which is in the captured image except for the region of the blade, to obtain a blade image; and inputting the obtained blade image into a recognition model of ice on a blade obtained by training on a sample set, to determine whether ice is on the captured blade, wherein the sample set comprises a plurality of blade images indicating that ice is on blades.