13 results about "Integral windup" patented technology

This invention discloses a sensorless permanent magnet synchronous motor (PMSM) control method based on an adaptive phase-locked loop (PLL) and an anti-saturation controller, comprising the following steps: S1, injecting a high-frequency square wave voltage signal into the estimated synchronous rotating coordinate system; acquiring the stator current of the PMSM to obtain a high-frequency current deviation signal in a two-phase stationary coordinate system; S2, using an improved anti-integral saturation controller as the speed loop controller to receive the speed command and feedback speed error signal; simultaneously, calculating the rotor position error signal based on the high-frequency current signal; S3, inputting the rotor position error signal to the adaptive PLL, which adaptively adjusts its undamped oscillation frequency according to the motor's operating state to achieve dynamic adjustment of the observation bandwidth, and outputs rotor position and speed estimates; sensorless vector control of the PMSM is achieved through the estimates. This invention exhibits excellent stability and adaptability during low-speed motor operation.

The application discloses a PID anti-integral saturation method, system, device and medium for an Ovation control system, and the method comprises the following steps: a TRANSFER function block is arranged between the output end of a PID controller and an actuator; a real-time limit value signal is acquired, and the real-time limit value signal comprises an upper limit signal value and a lower limit signal value; the output signal of the PID controller is compared with the real-time limit value signal, and the TRANSFER function block is triggered according to the comparison result; and the output value of the TRANSFER function block is reversely transmitted to the PID controller through a tracking line by using a preset configuration tracking function, so as to reset the internal operation result of the PID controller. By adding the TRANSFER function block at the output end of the PID controller and introducing the real-time limit value signal which dynamically changes with the working condition, the technical limitation that the internal limiting parameter of the PID module of the Ovation system cannot be introduced and cannot follow in real time is solved.

This invention belongs to the field of magnetic levitation bearing technology, specifically relating to a control method and system for magnetic levitation bearings. By combining auxiliary fourth-order LESO with integral sliding mode control, the anti-disturbance capability is significantly improved, and the suppression effect on various disturbances is superior to traditional control. By employing a saturation function and an external integrator, the problems of control chattering and integral saturation are solved. With the help of piecewise fal function TD and other designs, dynamic and steady-state performance are balanced, achieving zero steady-state error levitation and greatly shortening the settling time. The control method proposed in this invention features core parameter correlation design, requires no complex tuning, is compatible with existing hardware, and can be directly embedded into the controller, making engineering implementation simpler.

The invention discloses a PMSM vector control method based on an improved low-voltage stress single-stage buck-boost inverter, and belongs to the field of power electronic conversion and motor drive control. The problems that when an existing single-stage buck-boost inverter drives a permanent magnet synchronous motor, the voltage stress is high, the dynamic response is slow, the disturbance rejection capacity is poor, and overshoot and integral saturation exist in traditional PI control are solved. The direct current bias of the bridge arm output voltage is filtered by using the output capacitor, so that the voltage stress of the power device is reduced; a set value weighted two-degree-of-freedom speed PI controller is introduced to suppress overshoot, rapid disturbance compensation is realized in combination with load torque feedforward, a steady-state static error is eliminated by adopting an amplitude limiting mechanism with inverse integral saturation, and the dynamic and steady-state performance of the system is improved; by calculating the duty ratio adaptive to the working condition and adopting the driving mode that upper and lower bridge arm switching tubes are conducted in pairs, unified control over the voltage reduction mode and the voltage boosting mode is achieved.

Provided in the present disclosure are a method and system for controlling an active power of a wind power plant, and a device and a storage medium. The method comprises: performing first amplitude-limiting processing on an acquired initial active power target value, so as to obtain an active power reference value; acquiring a proportional control parameter and an integral control parameter of PI control on the basis of the active power reference value and an actual active power feedback value; performing anti-windup threshold parameter fuzzy adjustment on the basis of a response time and a response time variation between a current execution cycle and the execution cycle preceding the current execution cycle, so as to acquire an anti-windup threshold parameter; and performing PI control on an active power on the basis of the proportional control parameter, the integral control parameter and a current integral value, so as to acquire an active power given value. In the present disclosure, a control mode centered on an anti-windup threshold parameter fuzzy regulator and adaptive switching of an integral windup limit value is added on the basis of a PI controller, so as to realize active power anti-windup control for a wind power plant, and the occurrence frequency of integral windup of the PI controller is reduced by means of amplitude limiting processing, thereby optimizing the adaptive PI controller.

The application discloses a kind of corn harvester automatic control method of line, belong to harvester technical field, the method includes integral term enabling judgment;With pre-look deviation ep (t) As the input of PID controller;Real-time comparison current deviation absolute value |e (t) |With the size of preset ε;If |e (t) |> ε, then disable integral term in PID controller, if |e (t) |≤ε, then enable integral term in PID controller.The application has the advantages that the integral saturation phenomenon under large deviation is eliminated, the system response time is shortened.Over-oscillation when approaching target line is effectively inhibited, and the risk of seedling loss is fundamentally reduced.The adaptability to dynamic interference such as terrain undulation is enhanced, and the control stability is improved.

The invention discloses an aero-engine Min-Max switching control method based on anti-saturation compensation in order to solve the problems that in the transition state process of an existing aero-engine Min-Max switching control strategy, due to integral saturation, system overshoot is too large, oscillation is violent, and adjusting time is too long. Based on the difference value between the output of the steady-state controller and the output of the Min-Max selection module, the internal parameters of the steady-state controller are corrected in real time by introducing the anti-saturation compensation loop, and the integral saturation phenomenon is effectively inhibited. Compared with an existing Min-Max switching control strategy, the method can remarkably improve the transition state performance of the engine on the premise of ensuring that the steady state performance is not affected, and has the advantages of being small in system overshoot, small in output oscillation, short in adjusting time and the like. The system is simple in structure, only an external compensation loop is added on the basis of a traditional Min-Max switching framework, an original control structure is not changed, the system is easy to integrate and implement in an existing aero-engine control system, and the engineering applicability is high.

The invention discloses a novel PI control method for SVPWM-DTC of a permanent magnet synchronous motor. According to the method, the idea of model reference adaptation (MRAS) is introduced, a given rotating speed and an actual rotating speed are taken as a reference model and an adjustable model respectively, the output difference value of the two models is taken as adaptive law input, and a proportion parameter Kp and an integral parameter Ki in PI control are adjusted in real time by adopting an MIT rule; the PI control method based on the MRAS performs first-order low-pass filtering on an input rotating speed error, sets integral amplitude limiting, and suppresses noise and integral saturation; an electromagnetic torque signal output by PI control generates a space voltage vector through an SVPWM modulation module, and the space voltage vector acts on an inverter to realize direct torque control; according to the invention, online adaptive adjustment of PI parameters can be realized, the dynamic response speed and anti-disturbance capability of the system are significantly improved, and torque ripple and overshoot are reduced.

The invention provides a power supply double-loop competition control anti-saturation system and method based on state perception and dynamic amplitude limiting, and relates to the field of power supply electronic control. The method comprises the following steps of: calculating voltage loop output and current loop output in each control period in parallel; inputting into a basic competition state channel, a trend competition state channel and a working condition competition state channel which are parallel, and extracting competition state characteristics in real time. And a fuzzy logic comprehensive evaluator is used to calculate the switching urgency degree of the competition state characteristics. And judging the non-dominant ring according to the switching urgency, dynamically adjusting the integral upper limit of the non-dominant ring, and carrying out intelligent integral control. After adjustment, output of the voltage loop and output of the current loop are processed through a minimum value selector, and a final PWM control signal is generated. The technical problems that due to the fact that the double-ring competition relation cannot be perceived, non-dominant ring depth integral saturation is likely to be caused, and when mode switching is caused by working condition abrupt change, current or voltage overshoot is serious, and system response is delayed are solved.

The invention belongs to the technical field of automobile electric power steering, and relates to an EPS permanent magnet synchronous motor field weakening calibration method based on integral anti-saturation, which comprises the following steps: firstly, based on a current loop integral anti-saturation method and a lead angle self-adaptive field weakening method, automatically converging to a proper current amplitude and a proper field weakening angle; secondly, recording flux weakening angles with different rotating speeds and different current amplitudes to form rotating speed-current-torque MAP; and finally, the MAP is integrated into an FOC algorithm. According to the method, the risk that the motor is out of control due to integral saturation of a current loop in the calibration process can be effectively avoided, meanwhile, online calculation is performed only in the calibration process by integrating the advantages of flux weakening of the lead angle, table look-up can be performed by using a table look-up method after calibration is completed, the calculation amount of an MCU is greatly saved, and the calibration efficiency is improved. The dynamic response of the motor is accelerated, and the calibration process of the motor is optimized.

The invention discloses a cooperative self-adaptive control method and device for parameters, dilution degree and combustion phase of a pre-combustion chamber. The method comprises the following steps: establishing a parameterized pre-combustion chamber structure set K, defining a working condition state vector and a controllable variable, setting constraints including a combustion phase CA50 window, a combustion duration CA10-90 threshold, cyclic variation COVIMEP and an emission threshold, and constructing an efficiency / stability / emission multi-target cost function; the structural layer selects a structural index k * which meets the constraint and has the minimum cost within K, and the control layer solves the optimal control quantity u * under the k * and enables target output to enter a set window through stacking control of CA50 closed loop + CA10-90 limitation; cA50, CA10-90 and COVIMEP are calculated on line based on the cylinder pressure signals, and parameter online identification and rolling optimization are carried out; when COVIMEP, UHC / NOx or CA10-90 is close to a threshold value, rapid switching between structural layer reevaluation and an equivalent structure composed of a replaceable orifice plate / nozzle assembly / adjustable taper angle piece is triggered, and protection such as inverse integral saturation and rate limitation is assisted. According to the scheme, the combustion phase and duration can be stably controlled under the wide-range working condition, circulation fluctuation and emission are reduced, the dilution limit is expanded, and the heat efficiency is improved.

This application discloses a control method for a gas turbine power generation system, comprising: pre-setting the load of a sampled generator; determining the load change rate of the gas turbine; determining a power difference when the absolute value of the load change rate is greater than a first preset change rate; estimating the opening and closing position of a fuel regulating valve based on the power difference and adjusting it to the opening and closing position; adjusting the angle of the IGV guide vanes based on the real-time speed of the gas turbine and the speed change rate until the speed fluctuation amplitude is less than a preset fluctuation range; and activating a PID control method to adjust the gas turbine speed to the target speed. This application, by estimating the fuel quantity using the power difference and adjusting the fuel regulating valve to the estimated position, can quickly reduce or increase the speed to near the target speed. Adjusting the IGV guide vane angle rapidly maintains the gas turbine operating smoothly near the target speed. Furthermore, when fine-tuning using the PID control method, the integral process of the PID is shortened, avoiding integral saturation and thus avoiding the regulation lag and speed fluctuation problems caused by integral saturation.

The invention discloses an anti-integral saturation FIR (Finite Impulse Response) control method and device. The core thought of the method is that all possible input saturation working conditions are enumerated offline, high penalty coefficients are designed one by one, and a group of DMC controllers are generated; through closed-loop testing and system identification, each DMC controller is converted into an equivalent low-order FIR model, and a group of incremental FIR controllers are obtained and stored for use; when it is predicted that the output of the controller is about to be saturated, performance evaluation indexes of all the FIR controllers are rapidly evaluated, and the optimal FIR controller is selected for undisturbed switching-in. According to the method, online QP and matrix inversion are not needed, operation can be carried out in a single-chip microcomputer, the calculation time consumption is reduced by 1-2 orders of magnitude, the method can be deployed in a millisecond-level closed-loop control scene, and the control quality loss in the constraint processing process is greatly relieved; the parameter setting step is simple, and the method can be directly popularized to non-square, ill-conditioned or high-dimensional systems.