87 results about "Full order" patented technology

A method of controlling of an induction machine using an inverter is disclosed with output LC filter. The method includes determining an inverter output current vector (iA), determining an inverter output voltage vector (uA), and forming a full-order observer having a system matrix (Â) and gain vector (K). The observer produces an estimated rotor flux linkage vector ({circumflex over (ψ)}R), an estimated stator current vector (îs), an estimated stator voltage vector (ûs) and an estimated inverter output current vector (îA). An estimation error (iA−îA) of the inverter output current vector is determined, and a speed adaptation law is formed based on the estimation error of the inverter output current vector for determining an estimate for electrical angular speed ({circumflex over (ω)}m) of the induction machine. The induction machine is controlled based on the produced estimates and a measured inverter output current.

The invention discloses a flux linkage error observation-based acquisition method of a full-order flux linkage observer of an asynchronous motor without a speed sensor and belongs to the field of a speed sensorless vector control full-order flux linkage observer. The problem that the existing speed sensorless vector control system causes low observation accuracy of the full-order flux linkage observer due to larger errors of motor parameters when a motor runs at low speed, and finally, the running stability of the system is poor is solved. A full-order flux linkage observer error feedback matrix coefficient is obtained according to the following rules, namely, the pole real part of the observer is smaller than the pole real part of an asynchronous motor, the real parts are both negative numbers, the zero pole real parts of an estimation rotation speed and a transfer function are both negative numbers, the error between an estimation flux linkage and a real flux linkage is utilized, when the motor runs at low speed, the equivalence of the system is a current model, and when the motor runs at high speed, the equivalence of the system is a voltage model. The rotor flux linkage phase position error coefficient ilambda is utilized and the rotor flux linkage amplitude error coefficient k is introduced, so that the estimation rotating speed precision is increased. The flux linkage error observation-based acquisition method of the full-order flux linkage observer of the asynchronous motor without the speed sensor is particularly used in the field of speed sensorless vector control.

The invention provides a permanent magnet synchronous motor full-order sliding mode variable structure position servo control method based on an extended state observer. The permanent magnet synchronous motor full-order sliding mode variable structure position servo control method comprises the following steps of establishing a permanent magnet synchronous motor system, and initializing system state and related control parameters; designing the extended state observer; based on the extended state observer, designing a full-order sliding mode controller, eliminating the chattering problem in sliding mode control, and guaranteeing that the system state can be quickly and stably converged to be zero. According to the full-order sliding mode variable structure position servo control method provided by the invention, the chattering problem of sliding mode control can be improved, the control precision of the system is improved, and the implementation for quick and accurate tracking on desired trajectories of motor output position is guaranteed.

The invention discloses a mechanical arm servo system full-order slide mold control method based on an extended state observer. The method comprises the following steps: establishing a dynamic model of a mechanical arm servo system, and initializing a system state and control parameters; designing the extended state observer; and based on the extended state observer, designing a full-order slide mold controller. The invention provided by the invention can effectively improve the problem of slide mold buffeting of conventional slide mold control in the mechanical arm servo system, improves the robustness of the system to a certain degree and enables the mechanical arm servo system to realize accurate tracking control.

The invention discloses a prediction-correction algorithm-based aircraft global pneumatic optimization method, and aims at solving the technical problem that the conventional aircraft global pneumatic optimization methods are low in efficiency. The technical scheme is that the method disclosed in the invention comprises the following steps: firstly carrying out prediction optimization: building an agent model through collecting flow field snapshots, and carrying out preliminary screening on the design space according to a genetic algorithm so as to obtain approximate points of a global optimum point; and carrying out correction optimization: carrying out pneumatic optimizing by utilizing an adjoint gradient and a gradient optimization algorithm to ensure that the predicted approximate points are rapidly converged to the global optimum point. According to the method disclosed in the invention, a flow field order reduction model is constructed by repeatedly using the previously obtained flow field snapshots during the optimization in the step 2, so as to rapidly predict a to-be-calculated flow field, and then correction is carried out on the prediction value by utilizing a full-order flow field solver. Compared with the methods in background technology, the method disclosed in the invention has the effect of improving the calculation efficiency of the flow fields; and for the two-dimensional optimization problem, the calculation of flow field numerical values is reduced from about 200 times in the background technology to about 70 times, so that the optimization effect is remarkable.

The invention discloses a method for controlling a salient pole permanent magnet synchronous machine in a speed sensorless mode, and belongs to the field of motor speed regulation. The method is characterized by including the steps of estimating effective counter electromotive force through an established full-order state sliding-mode observer according to the stator voltage and stator current measured in real time, and then obtaining the position and the rotating speed of a rotor through a locking phase ring. By means of the method, the problem of controlling the salient pole permanent magnet synchronous machine in the speed sensorless mode is solved, influences of motor parameters on speed sensorless control are smaller, robustness of deviation between position estimation and rotating speed estimation of the rotor is improved, sliding-mode noise is prevented from being amplified, and stability of the system is ensured.

A method for the stabilization of full-order flux observers for speed-sensorless induction motors in the regenerative mode. The method comprises determining the current vector of the induction motor, determining the stator voltage vector of the induction motor, forming a full-order flux observer having a system matrix (A) and a gain matrix (L), the state-variable observer being augmented with a speed adaptation loop, and producing an estimated rotor flux linkage vector and an estimated stator current vector, determining an estimation error of the stator current vector, defining a correction angle, and forming a speed adapt-tion law based on the cross product of the estimation error of the stator current vector and the estimated rotor flux linkage vector, where the correction angle is used to turn the rotor flux linkage vector or the estimation error of the stator current vector in order to keep the observer stable.

The invention discloses a stator flux linkage observation method, an electromagnetic torque observation method and devices utilizing the two methods respectively. A full-order slip form observer is utilized to collect line voltage uab and ubc of a stator of a permanent magnet synchronous motor and current components ialpha and ibeta which are output by a current coordinate conversion unit. Effective counter electromotive force (that img file=' DDA0000503801170000011. TIF' wi= '192' he= '74' / ) is obtained by closed loop observation estimation. The integral effect of a voltage model flux linkage observer in the prior art is removed. An electromagnetic torque calculation unit is utilized to collect the effective counter electromotive force (that img file= 'DDA0000503801170000012. TIF' wi= '176' he= '73' / ) and the current components ialpha and ibeta which are output by the current coordinate conversion unit. The effective counter electromotive force (that img file= 'DDA0000503801170000013. TIF' wi= '158' he= '71' / ) is utilized to calculate the rotating speed (that img file='DDA0000503801170000014. TIF' wi= '88' he= '80' / ), and then the effective counter electromotive force (that img file= 'DDA0000503801170000015. TIF' wi= '190' he= '72' / ), the current components ialpha and ibeta and the rotating speed (that img file= 'DDA0000503801170000016. TIF' wi= '62' he= '64' / ) are utilized to calculate the stator flux linkage (that img file= 'DDA0000503801170000017. TIF' wi= '216' he= '71' / ). By means of the method, the shortcoming in the prior art of the integral effect of the voltage model flux linkage observer is overcome, a speed sensor is not required, and speed-sensor-free stator flux linkage and electromagnetic torque observation is achieved.