6 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 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.

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.