8 results about "Saturation nonlinearity" patented technology

The invention discloses an anti-DoS attack and actuator saturation power system memory event trigger insurance cost control method and system, and relates to the technical field of network control systems. Establishing a state-space equation based on the dynamic characteristics of the power system; key influence factors in operation of the power system and external influence factors in a network environment are identified; constructing an output feedback controller based on a dynamic memory event triggering mechanism; a convex hull method is adopted to process saturation nonlinear characteristics of the actuator, a closed-loop system is obtained in combination with the state-space equation, and a guaranteed cost function is designed; and judging whether the closed-loop system meets the requirements of local asymptotic stability and a preset weighted disturbance attenuation level, solving a linear matrix inequality, and obtaining an output feedback controller gain and an event trigger weight matrix. The objective of the invention is to solve the problem that the system stability is difficult to guarantee under the complex conditions that a power system suffers from DoS attacks, actuator saturation exists and external disturbance faces.

A kind of permanent magnet synchronous motor sensorless system MTPA control method based on double-shaft injection belongs to permanent magnet synchronous motor MTPA control technical field.The present application is aimed at the problem of optimal current vector angle tracking precision reduction under the influence of position observation error and motor own saturation nonlinearity and cross coupling effect in position sensorless control.MTPA control includes injecting high-frequency voltage signal to observation shaft system, obtaining rotor position tracking error signal, and obtaining rotor position observation signal and speed observation signal;Rotor position signal after compensation is obtained by introducing current vector compensation angle based on rotor position observation signal, and MTPA shaft system is established;Auxiliary high-frequency voltage signal is injected in MTPA shaft system;MTPA shaft system motor torque equation considering position observation error and cross coupling effect is constructed, and MTPA shaft system efficiency optimization operation control criterion is constructed, and current vector compensation angle is adaptively calculated.The present application is used for motor sensorless system control.

The invention discloses a quantitative preset performance hovering control method for an underwater vehicle, and the method comprises the steps: designing a hovering controller through error transformation and a backstepping method based on a QPPC theory, and achieving the quantitative constraint of the transient overshoot and convergence time of a tracking error; adopting a radial basis function neural network RBF-NN to approach the uncertainty of the AUV kinetic model online and compensate external disturbance; for the dead-zone saturation nonlinearity problem of the propeller, a hyperbolic tangent smooth function is introduced, and the dead-zone saturation nonlinearity is reconstructed into a continuous differentiable smooth model in combination with the median theorem. Therefore, the problems that the dynamic performance cannot be quantitatively constrained, the model robustness is insufficient and the nonlinear compensation of the actuator is incomplete in the prior art are avoided, and meanwhile, the hovering control precision of the AUV in the complex marine environment is improved.

The invention discloses a double-hearth temperature synchronous control method and system based on a pulse signal, and the method comprises the steps: carrying out the nonlinear modeling of a hearth, including a temperature control model of a followed hearth and a temperature control model of a following hearth; a pulse differential equation model is used for describing a temperature error system of a following hearth and a followed hearth, on this basis, a set invariant condition of consistency of a temperature control system is obtained based on convex hull properties, and finally, by solving an optimal problem, the size of an attraction domain is estimated while a control gain is obtained, so that the control precision of the following hearth and the followed hearth is improved. And finally, a pulse control synchronization strategy of the double-hearth temperature system with input saturation is obtained. According to the method, the nonlinear characteristic of a hearth temperature system and the execution capability limitation of an execution mechanism are fully considered, and a control system is constructed into a system with input saturation nonlinearity; the system is controlled by using pulse signals, and low energy consumption and strong anti-interference performance in the regulation and control process of the system are realized.

This invention discloses a design method and system for an event-triggered controller based on a Markov model, belonging to the field of controller design technology. The method includes the following steps: establishing a hidden Markov model, including system state, control input, output, external disturbances, and time-varying state delay; designing event triggering conditions based on the hidden Markov model to dynamically trigger state information transmission; designing an asynchronous controller to generate control input based on the state information transmitted under the asynchronous event triggering conditions and handling actuator saturation nonlinearity; and analyzing the stochastic stability and H0 of the closed-loop system using Lyapunov functions and linear matrix inequalities. ∞ Performance; a matrix augmentation method is used to separate the product of the controller gain matrix and the Lyapunov variables, obtaining a result that simultaneously ensures the stochastic stability of the system and satisfies H ∞ The performance metrics are consistent with the gain matrix of all asynchronous and event-triggered controllers. The event-triggered controller designed in this invention can guarantee H... ∞ While ensuring anti-interference capabilities, the number of communication triggers is minimized to achieve on-demand control.

The application discloses a kind of electromagnetic pump flow control methods based on double duty ratio and current feedback compensation, it is related to flow control field, the electromagnetic pump flow control method based on double duty ratio and current feedback compensation includes: step S1, generates double duty ratio pulse width modulation signal, wherein first level PWM signal defines electromagnetic pump's macroscopic on-off timing to adjust the number of times of work per unit time, the beneficial effects of the present application are: the present application generates double duty ratio PWM signal, to first level coarse adjustment unit time work frequency and according to interval distribution on half wave, inhibit the low-frequency flow pulsation of traditional zero-crossing power regulation;By real-time acquisition coil current and closed-loop correction second level PWM duty cycle, effectively compensate the flow drift caused by coil temperature rise and voltage fluctuation;By querying nonlinear correction lookup table to obtain the optimized combination of first and second duty cycles, overcome the low-duty-cycle driving dead zone and high-duty-cycle magnetic circuit saturation nonlinearity.

This specification discloses a method and apparatus for vehicle control. Based on the acquired vehicle structural parameters, vehicle motion parameters, lateral and longitudinal control saturation functions, and a standard robust controller model, the state-space equations of the vehicle's closed-loop system are constructed. Then, based on the state-space equations of the closed-loop system, the corresponding closed-loop transfer function is determined. Next, based on the performance indices of the closed-loop system's state-space equations and the closed-loop transfer function, convex optimization inequalities are constructed and solved to obtain solutions. Finally, based on the solutions to the convex optimization inequalities, an optimal robust controller model is constructed, and the vehicle's lateral and longitudinal control is performed based on this model. Thus, by considering the vehicle's hardware performance during the calculation process, calculation results that meet the vehicle's performance limits are obtained, solving the saturation nonlinearity problem related to the vehicle's steering wheel angle and acceleration / deceleration.