10results about "Generator control circuits" patented technology

The application discloses a double-fed fan subsynchronous oscillation additional damping controller based on capacitor current compensation and relates to the field of novel power system stability analysis and control; solves the problems that the existing controller is relatively complex in determining control parameters, lacks universality and operation parameters cannot be modified at will; comprises a small signal model structure based on double-fed induction fan and weak power grid grid connection, and a general phase lead compensation link controller; phase compensation controller parameters are determined through double-fed induction fan voltage and current frequency response curves; the original system control structure can be not changed, the original control parameters of the system do not need to be adjusted, direct DC current signals are obtained from the DC capacitor part of the double-fed fan, control currents are injected in the form of controlled current sources, the rotor side control and the grid side control are decoupled, and the subsynchronous oscillation phenomenon caused by the interaction between the double-fed fan phase-locked loop and the weak power grid is suppressed.

The application discloses a full-order terminal sliding mode control method for a brushless doubly-fed motor independent power generation system, and belongs to the field of motor control. The application solves the problem that the traditional full-order terminal sliding mode control algorithm does not simultaneously consider the matching and non-matching uncertainty caused by motor parameter perturbation in the motor model, resulting in low system output voltage precision, poor system anti-interference ability and control effect. According to the brushless doubly-fed motor mathematical model, the application considers the matching and non-matching uncertainty caused by brushless doubly-fed motor parameter perturbation, determines the voltage loop state equation of the non-matching power winding outer ring voltage subsystem and the current loop state equation of the matching control winding inner ring current subsystem, and designs corresponding inner and outer loop full-order terminal sliding mode controllers for the subsystems to compensate the uncertainty, so that the tracking error of the power winding voltage amplitude converges to zero, and the tracking error of the control winding current amplitude converges to zero. The application is mainly suitable for independent power generation control when the brushless doubly-fed motor is connected to a balanced load.

A method of detecting whether a stator distortion filter is connected to a generator of an electrical power system includes temporarily interrupting magnetic flux excitation of a generator of the electrical power system. The method also includes observing a sinusoidal waveform of one or more electrical feedbacks of the generator. Further, when the sinusoidal waveform persists longer than a predefined duration, the method includes determining that the passive load is connected to the generator of the electrical power system. When the sinusoidal waveform abruptly decays below a threshold in a time period less than the predefined duration, the method includes determining that the passive load is not connected to the generator of the electrical power system. Moreover, the method includes implementing a control action based on whether the passive load is connected to the generator of the electrical power system.

A method for operating a generator of a grid-forming inverter-based resource. The generator has a rotor and a stator. The method includes receiving, via a controller, an actual generator signal associated with a reference signal or a command signal of the generator. The method also includes determining, via the controller, an expected generator signal associated with the actual generator signal based, at least in part, on a plurality of electrical feedback signals. Further, the method includes determining, via the controller, an error signal based on a difference between the expected generator signal and the actual generator signal. The error signal is representative of a rotor position error with respect to a synchronous reference frame. Moreover, the method includes correcting, via the controller, a rotor signal associated with a command signal or a feedback signal of the rotor based on the error signal. In addition, the method includes controlling, via the controller, the generator based on the corrected rotor signal.

The application discloses a kind of double-fed network unit positive and negative sequence current collaborative control method and system, it is related to double-fed unit network control technical field, the method includes: S1.data acquisition;S2.coordinate transformation and positive and negative sequence separation;S3.negative sequence current collaborative enabling logic design and negative sequence current instruction distribution;S4.network loop control;S5.positive and negative sequence reference voltage synthesis and generation rotor reference voltage.The application aims to solve how to improve positive and negative sequence separation method to adapt to double-fed unit variable speed operation characteristics and combined with network control, and how to design the collaborative control strategy of machine network side negative sequence current ring, to realize the high stability, high reliability operation of double-fed unit under the condition of weak power grid and asymmetric power grid.

The application discloses a kind of small signal model modeling method and equipment of double-fed wind power grid-connected system under AC asymmetric condition. Including the following steps: the nonlinear periodic time-varying dynamic model of mechanical system is established, the original nonlinear periodic time-varying dynamic model of electrical system and the nonlinear periodic time-varying dynamic model of control system;The original nonlinear periodic time-varying dynamic model of electrical system is carried out dq-sequence dynamic phasor transformation, and the key variable dominant frequency component is retained, to obtain the simplified nonlinear periodic time-varying dynamic model of electrical system;The nonlinear periodic time-varying dynamic model of mechanical system, the nonlinear periodic time-varying dynamic model of control system and the simplified nonlinear periodic time-varying dynamic model of electrical system are linearized on the steady-state periodic trajectory, integrated and eliminated algebraic variable, to obtain the linear periodic time-varying small signal model of double-fed wind power grid-connected system, the application provides modeling basis for wideband oscillation analysis of wind power system under asymmetric condition.

Providing core synchronization for linear generators. [Solution] A system and method for controlling two or more linear generators are provided, each operating according to repeating behavior so as to form a cycle. The control system utilizes a control circuit network to determine a desired phase offset between the operating cycles of a first linear generator and a second linear generator among the two or more linear generators. During operation, the actual phase offset between the first linear generator and the second linear generator is determined. The control circuit network of the control system is used to modify the operation of at least one of the first or second linear generators to achieve a desired phase effect.

This invention discloses a virtual space vector modulation method applicable to parallel converters in doubly-fed induction generator (DFIG) wind power systems, belonging to the technical field of excitation converter equipment for DFIG wind power systems. The method includes: classifying voltage vectors; defining voltage vectors as virtual vectors in a voltage vector space using control factors and transformation coefficients; dividing the voltage vector space into six circumferential sectors, and further dividing these six sectors into five vector regions based on the virtual space vectors; calculating the combined three-vector action time; comparing the midpoint voltage fluctuation value with an allowable threshold, and performing zero-sequence circulating current suppression and midpoint voltage control. This invention employs a virtual space vector modulation strategy and, based on the principle of compensating for the neutral point charge of the DC bus capacitor and canceling the zero-sequence circulating current of the voltage vector during the switching cycle, can achieve dual-objective control of midpoint voltage balance and zero-sequence circulating current suppression in parallel converters of DFIG wind power systems.

The present application relates to the technical field of power electronic device small signal stability improvement and oscillation suppression technology, and provides a method for eliminating the influence of a double-fed wind turbine phase-locked loop, which comprises the following steps: obtaining a rotor current d-axis component first difference value of a double-fed wind turbine rotor-side current d-axis component reference value and a double-fed wind turbine rotor-side current d-axis component measured value; obtaining a rotor current q-axis component first difference value of a double-fed wind turbine rotor-side current q-axis component reference value and a double-fed wind turbine rotor-side current q-axis component measured value; inputting a double-fed wind turbine stator-side voltage q-axis component measured value into a d-axis impedance remodeling link and a q-axis impedance remodeling link respectively to obtain a rotor current d-axis component second difference value and a rotor current q-axis component second difference value; then obtaining a rotor-side voltage d-axis component reference value and a rotor-side voltage q-axis component reference value output by a machine-side converter, and finally generating a PWM signal of the machine-side converter. The present application reduces the risk of oscillation and simplifies parameter design.