73 results about "Adaptive observer" patented technology

In a control apparatus for a synchronous motor, a coordinate converter converts a detected current into a current on rotational biaxial coordinates (d-q axis). A current controllers outputs a voltage command on the coordinates so that the current follows a current command on the coordinates. Another coordinate converters converts the voltage command into three-phase voltage commands. An adaptive observer calculates an angular frequency so that a q-axis component of an estimated rotor magnetic flux is zero. An inverter applies a voltage to the motor based on the voltage command.

The present invention relates to a permanent magnet synchronous motor (PMSM) speed sensorless adaptive rotating speed tracking control system and a design method thereof. Based on adaptive non-lineardamping, a robustness adaptive observer is constructed to estimate the rotating speed of a motor, the permanent magnet synchronous motor speed sensorless adaptive rotating speed tracking control system and the design method thereof are suitable for PMSM rotating speed tracking control having parameter perturbation or time varying, unknown non-linear and extraneous disturbance, do not need to estimate nondeterminacy parameters of the system or the extraneous disturbance, can ensure that all the dynamic signals of a closed-loop system have boundaries, and the design parameters are regulated, theobserver estimation errors and the motor rotating speed tracking errors can be subjected to convergence to be arbitrarily small.

A method of estimating stator resistance of a permanent magnet synchronous machine, when the permanent magnet synchronous machine is controlled with an inverter using a control system having an adaptive observer which is augmented with a signal injection, the adaptive observer having a stator resistance estimate ({circumflex over (R)}s) as a parameter, in which method an error signal (ε) is obtained from the signal injection, a speed correction term (ωε) is calculated from the error signal (ε), the rotor position estimate is corrected using the speed correction term (ωε) in the adaptive observer, whereby the error signal (ε) is driven to zero. The method comprises the step of correcting the value of the stator resistance estimate ({circumflex over (R)}s) in the adaptive observer when the speed correction term (ωε) differs from zero.

The invention discloses a self-adaptive fault-tolerant control method for a hypersonic aircraft, and the method specifically comprises the steps: carrying out the modeling of a hypersonic aircraft system, and considering the dynamic impact on the system from the modeling uncertainty of external interference and the like; establishing a robust adaptive observer by considering an H-infinity performance index, obtaining a design condition through Lyapunov stability analysis, and ensuring estimation error convergence in the presence of interference. An active fault-tolerant controller is constructed, so that a fault system is stable, and a certain H-infinity performance requirement is met. A semi-physical simulation platform of the hypersonic aircraft is built, and the effectiveness of the proposed fault estimation and fault-tolerant control scheme is verified on the semi-physical simulation platform. According to the invention, the precision of the observer is improved, and the external interference is better inhibited.

The invention, which belongs to the technical field of power grids, discloses a method and device for detecting a voltage parameter of a three-phase power grid. Clark conversion is carried out on a collected grid voltage signal; an adaptive observer is established based on the signal after conversion; and a grid frequency as well as a positive sequence voltage component and a negative sequence voltage component is observed and amplitudes and phase angles of the positive sequence voltage component and the negative sequence voltage component of the grid are estimated. To be specific, three-phasevoltages of the power grid are collected; Clarke transformation is carried out to obtain a grid voltage under a coordinate system; an observer is constructed; a positive sequence voltage component and a negative sequence voltage component of the grid are calculated; and amplitudes and phase angles of the positive sequence voltage component and the negative sequence voltage component of the grid are calculated. The dynamic response speed is fast; and the method and device have high steady-state accuracy even when the grid frequency changes. The invention provides a method for detecting a voltage parameter of a three-phase power grid and a corresponding hardware circuit. And the dynamic response speed is fast; and the method has high steady-state accuracy even when the grid frequency changes.

The invention discloses a nonlinear system fuzzy fault-tolerant control method based on an adaptive observer, and relates to the design of an adaptive observer containing a nonlinear system, the design of a state estimator and the design of a fuzzy fault-tolerant controller. The invention designs an estimator based on a self-adaptive sliding mode for a fault problem in the non-linear system. Aiming at a state constraint problem of the nonlinear system, a logarithm-based Lyapunov function is constructed; in order to realize tracking control, a fuzzy fault-tolerant controller is designed. According to the method, the problems of fault and state estimation and tracking control of the nonlinear system under fault and state constraints can be effectively solved.

The invention provides an attitude robust adaptive fault-tolerant control method for an unmanned aerial vehicle steering engine fault. The method comprises the following steps: observing a fault according to a current motor lift vector F, a current attitude angular velocity omega, a fault estimation value and a pre-designed sliding mode adaptive observer, determining and updating an attitude angular velocity estimation value, and calculating and updating an attitude angular velocity estimation error e omega according to the attitude angular velocity estimation value and the current attitude angular velocity omega; determining an attitude error quaternion eq according to the current attitude quaternion q and the target attitude quaternion qd; calculating a motor lift vector F according to apre-designed fault-tolerant controller so as to control and adjust the attitude of the unmanned aerial vehicle according to the motor lift vector; and estimating the error e omega and the attitude error quaternion eq according to the current motor lift vector F and the attitude angular velocity, and estimating and updating the fault estimation value according to the fault estimation value and theadaptive law. With application of the technical scheme, the influence of the unmanned aerial vehicle fault can be effectively overcome, the attitude stability is maintained, the calculation amount isgreatly reduced and the control efficiency is improved.

Systems, methods, and devices which estimate the inductor current in a power factor correction (PFC) converter for use with AC / DC converters. A control system for use with the PFC takes as input the input voltage and the output voltage of the PFC. Control signals for power semiconductor subcircuits in the PFC are then output from the control system. The control system uses an adaptive observer sub-circuit that estimates the inductor current and the bus voltage. The adaptive observer uses an adaptive updater which uses both the estimates and the estimate error to update the adaptive observer's estimates.

The present invention provides a position sensorless control method of a high performance permanent magnet synchronous motor during emergency operation, which can accurately detect a magnetic pole position of the synchronous motor based on a position sensorless vector control using an adaptive observer configured based on a permanent magnet synchronous motor model.

The invention relates to a nonlinear multi-agent fault-tolerant controller design method and a storage medium. The design method comprises the following steps: constructing a kinetic equation of a nonlinear multi-agent system; designing a self-adaptive observer and a filtered tracking error function, converting the filtered tracking error function based on a signal obtained by the self-adaptive observer, and obtaining the converted filtered tracking error function to design a self-adaptive fault-tolerant controller. The solution existence of a multi-agent closed-loop system under any initial condition is realized, and asymptotic ground and asymptotic ground are satisfied. Compared with the prior art, the adaptive fault-tolerant controller is designed by applying the adaptive observer, the problem of asymptotic tracking of a follower and a leader of a nonlinear multi-agent system affected by partial failure faults of the actuator and external interference is solved, gain offline calculation of the observer is avoided, and the influence of the external interference is inhibited.

A permanent magnet synchronous motor current type position estimation method for wind power generation based on an adaptive observer and a position estimation device. The position estimation device comprises a current sensor, a signal amplifier, a filter and a position estimator. The current sensor acquires phase current of the permanent magnet synchronous motor. The acquired signal is processed by the signal amplifier and the filter. The processed signal is transmitted to the position estimator, thereby estimating the position of the permanent magnet synchronous motor. The position estimator is obtained through operating the permanent magnet synchronous motor current type position estimation method for wind power generation according to the invention by a CPU. The permanent magnet synchronous motor current type position estimation method for wind power generation and the position estimation device are beneficial in that motor position estimation efficiency is improved because the method can be easily realized.