Abstract: The present invention provides a power control method, device and system for a wind power station. The power control method comprises: obtaining running state data of the wind power station and a grid connection point in real time; determining whether the state of the grid connection point meets conditions of secondary frequency modulation according to the running state data; if it is determined that the state of the grid connection point meets the conditions of secondary frequency modulation, determining a limited power instruction value according to a pre-obtained theoretical power value of the wind power station, a given value of automatic power generation control, and a standby active power value reserved for primary frequency modulation; and generating and sending an instruction used for controlling the active power of the wind generating set of the wind power station according to the limited power instruction value.

Abstract: A photovoltaic power plant and a secondary frequency modulation control method therefor are disclosed. The photovoltaic power plant includes a photovoltaic power station and an active power control system, wherein the photovoltaic power station includes a photovoltaic array and a photovoltaic inverter, the photovoltaic inverter being used for converting direct-current electric energy generated by the photovoltaic array into alternating-current electric energy; and the active power control system is used for performing power allocation on the photovoltaic inverter based on a power control AGC instruction value when running data of the photovoltaic power plant meets a pre-set secondary frequency modulation condition, and adjusting an active power output from the photovoltaic inverter based on an AGC instruction value of the photovoltaic inverter subjected to power allocation. The photovoltaic power station can improve the accuracy of power control and the stability of a power system.

Abstract: A drive control apparatus and method for a yaw motor of a wind turbine is provided. The drive control apparatus includes a frequency converter, a fault cut-out contactor, and a contactor. The frequency converter is configured to perform drive control on the yaw motor. The fault cut-out contactor is connected in series between the frequency converter and the yaw motor, and configured to be switched off in a case of a fault in the frequency converter, to isolate the failed frequency converter. The contactor is connected in parallel with the frequency converter and the fault cut-out contactor, connected to the yaw motor, and configured to continue to drive the yaw motor in a case that the fault cut-out contactor is switched off. The drive control apparatus and method can solve problem of low reliability of drive control of the yaw motor.

Abstract: A method and device for distributing active power for a wind farm are provided. The method includes: calculating a current total active power variation of the wind farm according to a current frequency variation of a power grid; distributing a current single-unit active power variation to each wind turbine according to a first preset strategy based on the current total active power variation and a single-unit storage energy value in a case that the current total active power variation is greater than zero; distributing the current single-unit active power variation to each wind turbine according to the first preset strategy based on the current total active power variation and a lowerable power value in a case that the current total active power variation is smaller than zero; and controlling each wind turbine to adjust its operating state.

Abstract: A heating furnace for heating an annular component, includes a furnace body, a heat medium driving component, a support part, a guide component, and a hollow cylinder. Part of the heat medium is ejected to the outer circumferential surface of the annular component through the guide part, and part of the heat medium flows through the inner channel of the hollow cylinder, and be ejected to the inner circumferential surface of the bearing via the second heat medium channel arranged on the hollow cylinder to heat the inner circumferential surface of the bearing. In this way, the hollow cylinder plays a role of distributing the gas to some extent, and as the upper end of the hollow cylinder is a sealed structure, the flowing gas is all converted into effective heat exchange gas flow and restricted to a heat exchange space on the bearing surface.

Abstract: Disclosed are a photovoltaic power plant and a primary frequency modulation control method therefor. The photovoltaic power plant comprises a photovoltaic power plant and an active power control system. The photovoltaic power plant comprises a photovoltaic array and a photovoltaic inverter, the photovoltaic inverter converting direct current electric energy generated by the photovoltaic array into alternating current electric energy. The active power control system is used for determining the variable quantity of active power of a single machine according to an operating state of the photovoltaic inverter when frequency values of grid connection points of the photovoltaic power plant meet a pre-set primary frequency modulation triggering condition, and regulating the active power output by the photovoltaic inverter. According to the disclosed photovoltaic power, the response speed and accuracy of primary frequency modulation of a generator set can be improved.

Abstract: A rotor, a motor, a reinforcement ring tool and a mounting method therefor are disclosed. A reinforcement ring tool may be mounted on the outer circumference of a rotor of a motor, the reinforcement ring tool comprising two or more separate components and two or more connecting members. The two or more connecting members correspond to the two or more separate components, and the two or more separate components are connected to each other by means of the two or more connecting members so as to form an annular body. At least two of the two or more connecting members are movable connecting members, and corresponding separate components are movably coupled to each other by means of the movable connecting members such that the reinforcement ring tool may be detachably engaged at the outer circumference of the rotor.

Abstract: An electrical connector includes a main body portion, connection portions, a total pressure acquisition portion and a static pressure acquisition portion. The connection portions are configured to allow the main body portion to be electrically connected to a charged element provided in a flow channel. The total pressure acquisition portion includes a total pressure measuring hole provided in a first part, facing a flow direction of fluid, of the main body portion. The static pressure acquisition portion includes a static pressure measuring hole provided in a second part, parallel to the flow direction of the fluid, of the main body portion. The fluid state test device and the fluid heat exchange system having the electrical connector are also provided. Thus, the original flow field where the electrical connector of the electrode of the electric heat source is located may not be changed, which avoids destruction to the flow field.

Abstract: A heating device for an annular component is provided. The heating device is configured to heat the annular component via hot gas flow, and includes a gas flow heater, a draught fan, and an annular cavity for accommodating the annular component. An outer wall of the annular cavity is provided with a gas flow inlet and a gas flow outlet, the gas flow heater heats a gas flow, and the draught fan enables the gas flow to enter into the gas flow inlet, pass through a gas flow passage in the annular cavity, and be discharged via the gas flow outlet.

Abstract: A vibration suppression method and device of a wind power generator is provided. The method includes: calculating a specified value of a flux-weakening control parameter of the generator according to a preset value of an electromagnetic active power of the generator and a frequency of the generator; and controlling the generator according to the specified value of the flux-weakening control parameter of the generator. The method and device reduce the magnetic load of the generator by the flux-weakening control, thereby suppress vibration and noise of the generator.

Abstract: A method and device for detecting equivalent load of wind turbine are provided. The method includes: detecting environment data of each wind turbine of multiple wind turbines in wind farm in each detection period; and in each detection period, detecting load of one or more calibration wind turbines in the multiple wind turbines, calculating equivalent load of the calibration wind turbines based on detected load, and determining equivalent load of each wind turbine based on detected environment data of each wind turbine with load estimation model, where load estimation model represents relation between environment data and equivalent load of wind turbine, and before load estimation model is applied in each detection period, parameter of load estimation model is calibrated based on the equivalent load calculated in current detection period and the equivalent load of the calibration wind turbines determined with load estimation model in previous detection period.

Abstract: A flexible molding process and system for a magnetic pole protective layer. The molding process is as follows: assembling magnet steels at respective positions on a side wall surface of a magnetic yoke, laying a reinforcing material and a vacuum bag in the listed sequence on the magnet steel and the side wall surface of the magnetic yoke, wherein the vacuum bag, the magnet steels and the side wall surface of the magnetic yoke form a sealed system; performing an impregnation process, including vacuumizing the sealed system to allow the impregnation liquid to be injected into the sealed system, to achieve infiltration and impregnation; heating the sealed system and/or emitting ultrasonic waves to the sealed system while performing the impregnation process; and performing a curing process after the impregnation process, wherein the impregnation liquid and the reinforcing material are cured to form a protective layer.

Abstract: A method for compensating the output power of wind turbine generator set includes acquiring the average values of the first ambient temperature of environments where the wind turbine generator set is located in various periods; collecting the output power of the wind turbine generator set at the end time of various periods; compensating the set output power collected at the end time of current period according to difference value between the average value of the first ambient temperature in the current period and that in the previous period so as to guarantee the stability of the set output power if the average value of the first ambient temperature in the current period and the average value of the first ambient temperature in the previous period both are higher than a preset temperature threshold value.

Abstract: A process and process apparatus for forming a protective coating on a magnetic pole of a permanent magnet motor. The process for forming a protective coating on a magnetic pole of a permanent magnet motor includes: horizontally placing a motor rotor, and controlling to perform, at positions of an inlet and an outlet operating on a vacuum bag in a current state, vacuumization and adhesive injection only on an arc section located at the bottom of the motor rotor; and driving the motor rotor to rotate by a predetermined angle after the adhesive in the arc section is initially cured so as to rotate the next arc section in which no adhesive is injected to the bottom, until all arc sections in the circumferential direction of the motor rotor are injected with the adhesive.

Abstract: A motor rotor holder and a motor are provided according to the present application. The motor rotor holder is rotatably supported in a housing of the motor, and the motor rotor holder includes: a first cooling channel which allows interior spaces at two axial sides of a rotor in the housing to be in communication with each other so as to direct a first cooling medium through the first cooling channel; and a second cooling channel which is in communication with an exterior of the housing so as to direct a second cooling medium through the second cooling channel. The first cooling channel and the second cooling channel are provided to have a common heat conduction portion, and the first cooling medium is allowed to exchange heat with the second cooling medium via the common heat conduction portion.

Abstract: The disclosure provides a wind turbine generator and a control method thereof. The wind turbine generator comprises at least two power transmission systems connected each other in parallel and a control system comprising an upper controller and control subsystems corresponding to the power transmission systems and comprising bottom controllers. The bottom controllers monitor operating state parameters of functional units in corresponding power transmission systems, and when determining corresponding functional units meet abnormal conditions according to operating state parameters, send operating state parameters of corresponding functional units to the upper controller; the upper controller generates operating instructions when determining faults of the corresponding functional units occur according to operating state parameters of corresponding functional units, to control power transmission systems to work according to operation instructions.

Abstract: A heating furnace for heating an annular component, includes a furnace body, a heat medium driving component, a support part, a guide component, and a hollow cylinder. Part of the heat medium is ejected to the outer circumferential surface of the annular component through the guide part, and part of the heat medium flows through the inner channel of the hollow cylinder, and be ejected to the inner circumferential surface of the bearing via the second heat medium channel arranged on the hollow cylinder to heat the inner circumferential surface of the bearing. In this way, the hollow cylinder plays a role of distributing the gas to some extent, and as the upper end of the hollow cylinder is a sealed structure, the flowing gas is all converted into effective heat exchange gas flow and restricted to a heat exchange space on the bearing surface.

Abstract: A method for detecting fatigue state of cog belt of wind power generator set is provided, including acquiring pitch angles satisfying preset condition, acquiring signal characteristic values corresponding to the pitch angles, selects from the pitch angles according to acquisition timing sequence of signal characteristic values pitch angles at which signal characteristic value changes, performing characteristic statistics on selected pitch angles to acquire characteristic statistic value and determining whether the cog belt is in fatigue state by comparing characteristic statistic value with predetermined threshold.

Abstract: A heat dissipation retaining structure for a heat production device, an installation method thereof, and a wind turbine generator set. The heat dissipation retaining structure comprises a retaining structure body for defining a middle space, and a thermal radiation absorption coating (3), a heat insulating material, or an infrared low-emissivity and high-reflectivity material is at least partially applied to an inner wall of the retaining structure body (5). The air temperature of the environment in the retaining structure is actively decreased by the foregoing structure under the conditions that noise is avoided, environmental friendliness is achieved, external power is omitted, and energy consumption is zero, thereby decreasing the temperature of the heat production device, and ensuring that the heat production device works at the allowable normal temperature for a long time.

Abstract: A heating device for protecting a bearing of a wind power generator and a bearing system, wherein the heating device is applied to a main shaft of the wind power generator that is externally provided with a bearing, and the heating device is disposed inside the main shaft at a position corresponding to the position of the bearing. The heating device includes multiple circular arc sections, a flexible heat source and a supporting device. The flexible heat source is provided between the circular arc sections and an inner wall of the main shaft. The supporting device supports the internal surface of the circular arc sections, so that the flexible heat source is closely adhered to the inner wall of the main shaft. A heat source is provided for the bearing by the heating device for bearing protection of a wind power generator and the bearing system.