158 results about "Double fed induction generator" patented technology

A variable speed wind turbine is disclosed comprising a turbine rotor that drives a doubly-fed induction generator, a matrix converter which converts variable frequency output into constant frequency output, and a control unit and a protection circuit for the matrix converter. Power is circulated in the system allowing for sensorless detection of rotor position and better output ratios of power from the system.

The present invention relates to an improved wind turbine, of the type which employs doubly fed induction generators (DFIG), and a wind park including the same, which permits the use of lighter weight turbines, with the ability to have greater energy capture, more precise control of asymmetrical phases and enhanced maintenance and support of the grid during fault conditions.

A variable speed wind turbine having a doubly fed induction generator (DFIG), includes an exciter machine mechanically coupled to the DFIG and a power converter placed between a rotor of the DFIG and the exciter machine. Thus, the power converter is not directly connected to the grid avoiding the introduction of undesired harmonic distortion and achieving a better power quality fed into the utility grid. Moreover, the variable speed wind turbine includes a power control and a pitch regulation.

Disclosed is a controller of a grid coupled type doubly-fed induction generator having a multi-level converter topology, which can control the doubly-fed induction generator having a high voltage specification and can perform a fault ride-through function, an anti-islanding function and a grid voltage synchronization function required for a dispersed power generation facility. The controller makes a H-bridge multi-level converter generate a three-phase voltage waveform resulted from the structure that single-phase converters each being composed of a 2-leg IGBT are stacked in a serial manner, and controls a rotor current so as to make the rotor coil of the doubly-fed induction generator in charge of a slip power only. The boost converter is composed of a 3-leg IGBT and a boost inductor generating a direct current voltage of its source required for the H-bridge multi-level converter.

This invention discloses a system and method to operate a doubly-fed induction generator (DFIG) as a grid-friendly virtual synchronous generator (VSG). It comprises a DFIG modeled as a virtual differential gear that links a rotor shaft driven by a prime mover, a virtual stator shaft coupled with a virtual synchronous generator G and a virtual slip shaft coupled with a virtual synchronous motor M, and a variable frequency drive that behaves as a virtual synchronous motor-generator set to regulate the speed of the virtual synchronous motor M so that the speed of the virtual stator shaft, i.e., the speed of the virtual synchronous generator G, is within a narrow band around the grid frequency even when the rotor shah: speed changes. As a result, a grid-connected DFIG can be controlled to behave like a virtual synchronous generator without using a PLL.

A double fed induction generator (DFIG) system and controller are presented in which the rotor side converter is preloaded with one or more initial values for resuming regulated operation to counteract transients upon deactivation of the crowbar protection circuit to provide grid fault ride through.

The invention relates to wind turbines provided with doubly fed induction generators and with at least one power converter which is novel in that, under certain circumstances, it enables the turbine to operate as a full converter (FC) system, as a doubly fed (DFIG) system or as an asynchronous (AS) system, thereby increasing turbine availability.

The invention provides a method for calculating transient state short circuit currents of a doubly-fed induction generator set. The method comprises the steps that a transient state mathematical module of the doubly-fed induction generator set is established under a network voltage depth drop fault, and a transient state equivalent circuit of the doubly-fed induction generator set is established according to the transient state electrical relation in the mathematical module; the flux linkage relation of the transient state equivalent circuit of the doubly-fed induction generator set is analyzed, and first stator transient state currents generated when generator terminal voltages of the doubly-fed induction generator set drop are obtained; the transient state equivalent circuit of the doubly-fed induction generator set is corrected according to a crowbar circuit input mechanism, and second stator transient state currents generated when the generator terminal voltages of the double-fed induction generator set drop under the condition that crowbar circuits are input are obtained after correcting. The transient state short circuit currents of the doubly-fed induction generator set are obtained according to the second stator transient state currents.

A control system for a double-fed induction generator (DFIG) comprising a rotor (1) having rotor windings and a stator (2) having stator windings connectable to a grid for electric power distribution. The control system comprises a converter (170, 171), having a clamping unit comprising at least one passive voltage-dependent resistor element (291, 292, 293, 294) for providing a clamping voltage over the rotor windings when the clamping unit is triggered. The invention also relates to a double-fed induction generator (DFIG) system and to a method for protecting the converter in a power generation system.

A variable rotational speed wind turbine includes a doubly-fed induction generator, a rotor current controller for controlling the rotor currents of the generator, a compensation mechanism having a computation mechanism, and an input mechanism for providing input to the compensation mechanism, the input being representative of at least the instantaneous angular speed of the rotor of the generator. The computation mechanism is arranged to compute an instantaneous compensation control output in dependency of the instantaneous angular speed of the rotor of the generator and feed the compensation control output to the rotor, and to compute the compensation control output during operation of the wind turbine to compensate at least partly for dependencies on the rotor angular speed of the locations of poles of a generator transfer function, thus making a resulting generator transfer function substantially independent of variations in the rotor angular speed during operation of the wind turbine.

The invention belongs to the field of controlling a power conversion device of a wind driven generator, relating to a rotor current control method of a double-fed wind driven generator under power grid faults. The method comprises the following steps: obtaining the stator voltage and the rotor current under a two-phase static coordinates by utilizing the detected three-phase stator voltage and the three-phase rotor current through a 3/2 conversion module; calculating the stator magnetic flux linkage and the position angle; calculating the slip frequency angle and the slip frequency angular velocity; summating the stator magnetic flux linkage position angle and the rotor position angle, and then carrying out differentiation to obtain the sum of the magnetic flux linkage angular velocity and the rotor angular velocity; calculating the rotor current set values under the two-phase static coordinates of a rotor; respectively subtracting the rotor current set values under the two-phase static coordinates of the rotor with the rotor current under the two-phase static coordinates and obtaining the reference value of the rotor voltage under the two-phase static coordinates through the calculation by utilizing a performance requirement (PR) controller; and generating the switching signal of a control power device. The rotor current control method has the advantages that the rotor current oscillation of a double-fed induction generator (DFIG) resulted from power grid faults can be effectively inhibited, the grid in-service operation of the double-fed wind driven generator, and the operation performance of the DFIG under the power grid faults is enhanced.

The invention discloses a virtual double-fed induction generator inertia control method coordinated with secondary frequency regulation, which solves the problem of cooperation between the virtual inertia control of a wind turbine generator and the secondary frequency regulation of a power system. On the basis of an original virtual inertia control module, a module which is coordinated with the secondary frequency regulation of a power system is added, so that the overall frequency regulation effect is increased. Moreover, in the added module, the rotational speed of the rotor of the wind turbine generator is considered, so that the wind turbine generator can continuously operate within a safe rotational speed range; the problem of the affection of system frequency fluctuation on the active regulation capability of the wind turbine generator is solved; because the affection of system frequency fluctuation on the active regulation capability of the wind turbine generator is great, in order to ensure that the double-fed induction generator has better frequency regulation capability, the steady-state frequency response of the wind turbine generator is optimized, and moreover, accordingly, a control strategy is designed, so that the frequency regulation effect of the wind turbine generator is increased to a certain degree.

The present subject matter is directed to systems and methods for controlling variable speed generators, particularly converters associated with doubly-fed induction generators (DFIG) to permit use of harmonic attenuating filters that are generally smaller and less costly than previous similar filters. The subject matter provides for controlling line-side and rotor-side converters in such a manner that the frequencies generated by the converters are interleaved in a manner that the filters see a higher switching frequency and thus may be designed based on those higher frequencies, thereby requiring smaller and less expensive components.

The invention relates to an operation control method of a double-fed wind generator participating in electric power system frequency modulation. The operation control method is characterized in that a deloading operation curve which has a power up-regulation capacity is set and a deloading control strategy in which variable speed and variable pitch are used for coordination control is designed according to an operation physical constraint condition of a Double-Fed Induction Generator (DFIG) which is common in a variable speed constant frequency generator, and the maximum deloading amplitude capability of the wind generator under each operation condition is quantitatively analyzed according to the operation physical constraint condition of the wind generator at different wind speeds. Through adjustment and control of a dropping frequency, the support effect of the wind generator to the system frequency under a deloading operation mode is verified. Through the simulation analysis, it is verified that in the deloading frequency modulation control scheme, when the system frequency fluctuates, the variable speed and variable pitch wind generator can effectively release kinetic energy, and the frequency support is provided for the system.

The invention discloses a doubly fed induction generator internal frequency synchronization method and device based on power balance. The method comprises the steps that the internal synchronization mechanism of a synchronous generator is referred, and slip angular frequency of the rotor side exciting voltage is directly generated by adjusting active power deviation, and phases are obtained through integration processing; an excitation system of the synchronous generator is referred, amplitude of the rotor side exciting voltage is directly generated by adjusting reactive power deviation or terminal voltage deviation, a rotor side exciting voltage vector is obtained through the obtained phases and the amplitude, and internal frequency synchronization control of a doubly fed induction generator is achieved. By means of the doubly fed induction generator internal frequency synchronization method and device based on the power balance, the doubly fed induction generator can possess internal frequency which outward represents as a voltage source with the amplitude and frequency being controlled, high voltage support is provided for a power grid, capacity of short circuit of the power grid is improved, and stability of the power grid is improved. By the adoption of the internal frequency synchronization control, the doubly fed induction generator can operate without depending on intensity of the power grid, a possibility of independent operating of the doubly fed induction generator is provided, and a certain guarantee is provided for safe operating of a power system.

The invention belongs to the field of control of power conversion devices of wind driven generators and relates to a control method of a double-fed induction generator (DFIG) under a power grid voltage three-phase symmetrical drop fault. The control method comprises the following steps of: calculating a stator voltage, a stator current and a rotor current under a two-phase static coordinate system; calculating the magnetic flux linkage as well as stator voltages and stator currents of a shaft d and a shaft q under synchronous rotation coordinates; calculating a slip frequency angle and a slip frequency angle velocity; calculating stator currents of the shaft d and the shaft q under the rotation coordinates; calculating active power, reactive power and electromagnetic torque of a stator; calculating a decoupling compensation voltage of a rotor; obtaining a primary component actual value of the rotor current after the rotor currents of the shaft d and the shaft q under the rotation coordinates pass through a band-pass filter and a lead lag link on the basis of a compensation target, obtaining a difference of the primary component actual value and a primary component set value and calculating through a PI (Proportional-Integral) controller to obtain a primary component compensation item; calculating a set value of the current of the rotor shaft d under the rotation coordinate system; obtaining a difference of a rotation speed set value and a rotation angular rotation speed actual value and calculating through the PI to obtain a set value of the current of the rotor shaft q under the rotation coordinate system; calculating to obtain a reference value of the rotor voltages of the shaft d and the shaft q under the rotation coordinate system; and calculating the rotor voltage under the two-phase static coordinate system and generating a switch signal for controlling a power device.