13 results about "Pid regulator" patented technology

The invention discloses a six-phase motor driver harmonic current suppression method based on multi-subspace control, and belongs to the technical field of motor control. In order to solve the problem that low-order harmonic current of a six-phase motor in a z1-z2 subspace is difficult to effectively suppress, the invention provides a scheme that a mathematical model of the six-phase permanent magnet synchronous motor is established, multi-subspace decomposition is carried out, and stator current is divided into a d-q subspace and the z1-z2 subspace; a double-closed-loop control architecture with a speed loop as an outer loop and a current loop as an inner loop is constructed, a d-q subspace adopts a PID regulator to realize fundamental current control, and z1-z2 subspaces realize suppression of fifth and seventh harmonic currents through a parallel structure of PI and a quasi-proportional resonance controller; and a PWM signal is synthesized through inverse transformation and dual three-phase space vector pulse width modulation, and an inverter is driven to realize stable output of fundamental wave energy and harmonic suppression. The method effectively reduces the harmonic distortion rate, improves the operation efficiency and stability, and is suitable for occasions of new energy vehicles, ship propulsion, rail transit and the like.

The invention belongs to the technical field of sputter deposition, and provides an automatic temperature control system and method for a sputter deposition device, and the system realizes the accurate control of the cavity temperature in the sputter deposition process by integrating components such as a vacuum gauge, a gas cylinder, a valve, a thermocouple temperature measurement element and a PID (Proportion Integration Differentiation) regulator. The system monitors the temperature of the cavity in real time by using the thermocouple, and automatically adjusts the power of the heating wire through the PID regulator according to the comparison result of a set value and an actual value, thereby maintaining the stability of the temperature of the cavity. In addition, the system has the function of communicating with an upper computer, remote monitoring and control can be carried out through a software layer, and the automation level and the temperature control precision of the sputtering deposition process are improved. The problems that in the prior art, temperature control precision is low, the automation degree is insufficient, and stability is poor are solved, through linkage control over the temperature, the vacuum degree and the gas flow, the consistency of film performance is guaranteed, and the method is suitable for large-scale production of high-precision films.

The present disclosure provides a liquid level control device, method, equipment and storage medium. The present disclosure sends start or stop instructions to the switching module through the start-stop module; the switching module receives the start or stop instructions and selects different control paths based on the start or stop instructions; the rate control module receives an enable signal; based on the enable signal, a preset rate limit value and a preset liquid level target value, a smooth target value is determined and sent to the PID regulator; the PID regulator receives the smooth target value or a tracking signal and controls the liquid level based on the smooth target value or the tracking signal. In summary, the technical solution provided by the present disclosure can provide precision and smoothness of liquid level control and can adapt to various application scenarios.

The application discloses a kind of with load decoupling's coal circulating fluidized bed boiler bed temperature independent regulation method, solve the existing boiler bed temperature and boiler load coupling, cannot realize the problem of boiler bed temperature independent regulation and stability;With furnace differential pressure as the second PID2 regulator input value PV2 is set, the output value of second PID2 regulator is used as the control input signal of the variable frequency motor of boiler ash cooler discharge capacity, realize the adjustment of the circulating ash of the above two conditions, and the set value SP1 and measured value PV1 of bed temperature are used as the input value of first PID1 regulator, the output value of first PID regulator is used as the differential pressure set value SP2 of second PID2 regulator, through the coupling connection of first PID1 and second PID2, realize with bed temperature change as input, with the control input signal of the variable frequency motor of boiler ash cooler discharge capacity as execution unit, realize the stable regulation of boiler bed temperature and bed temperature and boiler load decoupling.

The utility model discloses an integrated control system of a screw compressor, which comprises a servo control system, a double-screw compressor, a water cooler, a gas storage tank, a pressure protection switch and a display panel, the gas storage tank is provided with a pressure sensor and a temperature sensor, the servo control system comprises a PID (Proportion Integration Differentiation) regulator, and the display panel is connected with the double-screw compressor. And the servo control system adjusts the rotating speed of a driving motor of the double-screw compressor in real time through a PID (Proportion Integration Differentiation) regulator to be matched with the change of gas consumption. According to the servo control system, the rotating speed of the motor can be adjusted through the PID regulator, the situation that air inflow and unloading of the screw compressor are completely stopped due to the fact that the pressure upper limit is reached in a traditional control mode is avoided, the operation efficiency is improved, and the technical effect of energy conservation is achieved.

The application discloses a kind of based on power pre-control's constant speed mode control's calibration method and device, greatly reduce the calibration time in customer field, improve the project test schedule, shorten project cycle, provide the buffer time for solving the problem of contingency.The application includes: obtaining the flight state instruction signal sent by flight control simulator, the flight state instruction signal contains the target speed of preset engine;According to the flight state instruction signal, control the engine to run to the target speed;According to the engine loading of electric power dynamometer;The actual running speed of the engine is obtained;Judge the speed difference of the actual running speed and the target speed, if no, then the running speed of the engine is adjusted to the target speed by PID regulator;The current running speed of the engine is obtained again;According to the current running speed, calculate target torque.

The present application relates to the technical field of steel metallurgy automatic control, and especially relates to a method for solving the furnace pressure fluctuation of a step-by-step heating furnace, which comprises the following steps: constructing an electrical and instrument PLC communication link to acquire a furnace door action signal in real time and presetting a compensation parameter; when detecting that the furnace door is opened, instructing a PID regulator to switch to a manual mode, and reducing the opening degree of a flue damper or the running frequency of a fan according to the working condition to perform feedforward compensation; when the furnace door is closed, restoring the opening degree or frequency reference value, and switching back to the automatic mode after a delay preset time. In addition, the method further comprises the steps of compensation value self-learning optimization, exhaust temperature correction, safety interlocking and the like. The present application can break the hysteresis of traditional regulation, realize active defense of furnace pressure interference, control the furnace pressure fluctuation in a narrow range, effectively reduce energy efficiency loss and prolong the service life of equipment.

The invention relates to the technical field of metallurgical automation control, in particular to a method and a system for reducing unit consumption of coal gas by increasing heat recovery temperature by reducing cold air mixing quantity, and the method and the system are characterized in that the opening degrees of a fan outlet pneumatic control valve I and a fan outlet pneumatic control valve II are synchronously adjusted through a PID (Proportion Integration Differentiation) regulator according to the temperature of flue gas in front of a heat exchanger; and the cold air mixing amount in the air heat exchanger and the gas heat exchanger is controlled. The system has the advantages that the opening degree of the first fan outlet pneumatic control valve and the opening degree of the second fan outlet pneumatic control valve are synchronously adjusted through the PID regulator according to the temperature of flue gas in front of the heat exchanger, it is guaranteed that the air outlet amount of the first air mixing cooler and the air outlet amount of the second air mixing cooler are consistent, and energy consumption increase caused by uneven loads is avoided; due to the double-fan design, part of functions can still be maintained when a single fan breaks down, and the fault tolerance of the system is higher; oxygen content linkage is adopted, when the cold air mixing amount is larger than 83,000 m / h and the oxygen content is larger than 14.5%, temperature correction of the heating section is automatically triggered, the combustion intensity is reduced, and pollutant generation is controlled from the source.

The present application relates to the technical field of power plant production process automation, and discloses a coal mill air distribution warm grinding control method and device, electronic equipment and a storage medium. The method comprises the following steps: in the automatic mode, in response to the mill closing signal, the inlet cold air volume of the mill is increased by using a slope generator, and the outlet temperature of the mill is adjusted by a first PID regulator; when the inlet air volume is greater than or equal to a first air volume threshold, the inlet air volume and the outlet temperature are adjusted by the first PID regulator and a second PID regulator in a push-pull balance mode; when the inlet air volume is greater than or equal to a second air volume threshold and the outlet temperature is greater than or equal to a temperature threshold, the outlet temperature of the mill is adjusted by using a third PID regulator to schedule cold air, and the inlet air volume of the mill is adjusted by using a fourth PID regulator to schedule hot air. The present application realizes full-automatic control from the start to the normal operation of the coal layer burner, and eliminates the hidden danger of "misoperation" that may occur in the complex operation process by manual operation.

The invention relates to the technical field of proportional electromagnetic valve control, and discloses a proportional electromagnetic valve current control circuit and system, which comprises a detection circuit, a comparison circuit, an electromagnetic valve driving circuit and a feedback regulation circuit with a multi-stage regulation structure, the detection circuit is connected with the electromagnetic valve driving circuit and the comparison circuit, the feedback regulation circuit is connected with the electromagnetic valve driving circuit and the comparison circuit, and the electromagnetic valve driving circuit is further connected with a proportional electromagnetic valve; a plurality of integration links and proportional links are added on the basis of a traditional PID regulator, so that a control system can obtain a higher response speed, and in an occasion with a tremor current control requirement, compared with the traditional PID regulator, the tremor current control method can eliminate speed errors and acceleration errors and improve the control precision.

The application belongs to the field of brake system control, and is an aero-engine acceleration state brake system control method. Key parameters of engine acceleration process control are selected first, each key parameter is provided with a target limit value, and a deviation threshold is set between each key parameter and the corresponding target limit value. When the deviation of engine acceleration process control exceeds the deviation threshold, the acceleration state is exited. At this time, the control value obtained by the acceleration fuel supply exit PID regulation is controlled, the brake oil amount is obtained, and the brake control is switched. The deviation threshold is set to realize the switching between the engine acceleration process control and the brake control, to realize that the engine acceleration state fuel supply PID regulator meets the acceleration requirement, and to realize the requirement of rapid braking when the acceleration state is exited, so as to avoid engine over-temperature, over-speed and over-pressure, thereby solving the shortcoming that the acceleration fuel supply PID regulator cannot be compatible with acceleration and over-regulation limitation.

The invention relates to a method for reproducing the concentration of hydrocarbons in a steam-gas mixture by dynamically mixing two gas streams. The technical problem addressed by the invention is that of providing a device which can be used for preparing a plurality of steam-gas mixtures which are in a liquid state in a normal state. The device comprises a machine shell with a control unit, a connecting pipeline, a gas diluent flow regulator and a liquid flow regulator, and the regulators are all provided with PID regulators and connected with an evaporator through a mixing device. And the liquid flow regulator is connected with the liquid storage tank. The gas diluent flow regulator adopts a mass flow meter structure with a regulating valve; the liquid flow regulator is also a mass flow meter. The mixing device is a three-way mixer and is provided with a regulating valve. The evaporator is a heat exchanger with an electric heater and is provided with a temperature sensor.

The invention relates to the technical field of power supply circuits, in particular to a bidirectional buck-boost continuous seamless switching direct-current power supply device and a control method, and the bidirectional buck-boost continuous seamless switching direct-current power supply device comprises a two-level Buck Boost buck-boost circuit unit, a control unit, an FPGA unit and a three-level buck-boost unit; the two-level unit comprises a capacitor C1, an inductor L1 and IGBT tubes Q11-Q12, the three-level unit comprises IGBT tubes Q21-Q24 and voltage dividing capacitors C21-C22, and grid electrodes of the IGBT tubes are connected with the control unit through the FPGA unit. According to the control method, by judging the running direction, the Q12, the Q21 and the Q24 are closed and the Q11, the Q22 and the Q23 are controlled during forward running, and the Q11, the Q22 and the Q23 are controlled on the contrary during reverse running; a single PID regulator is adopted to realize voltage and current double-closed-loop control, and a precise driving pulse is generated in combination with neutral-point balance regulation and PWMEN signal linkage logic. The device solves the problem of voltage jump of buck-boost switching of an existing device, has the advantages of being high in stability, low in cost and high in anti-interference capacity, and can be widely applied to scenes such as ships with strict requirements for voltage stability.