6 results about "Mean value model" patented technology

The invention relates to a multi-aircraft control method and system considering thrust saturation of a piston engine, and the method comprises the steps: carrying out the dynamic modeling of a cruise type guidance aircraft, and obtaining a kinematical equation and a kinetic equation under a trajectory system; modeling a multi-aircraft system to obtain a leader following type formation control model; an average value model is established for the two-stroke piston engine, a transfer function is obtained through linear processing, and a rotating speed controller is designed based on the active disturbance rejection control theory; constructing a non-singular terminal sliding mode surface matrix with fixed time convergence according to the formation error state; taking the deviation between the actual control input and the expected control input as a state quantity to construct a saturation suppression system; and combining a saturation suppression system with the nonsingular terminal sliding mode surface matrix, and designing an anti-saturation fixed time convergence nonsingular terminal sliding mode formation control law, so that the formation error is converged to zero within fixed time. The formation time can be shortened, and the formation control precision is improved.

The invention discloses an oil consumption prediction method, device and system and a storage medium. The method comprises the steps that a joint simulation model composed of a whole vehicle transmission system model, a thermal management thermal model, an engine physical model and an engine control model is constructed; simplifying the engine physical model from a detailed physical model to a parameterized mean value model through neural network training based on rack normal temperature data; generating a correction coefficient for the parameterized mean value model according to the whole vehicle transmission system model, the thermal management thermal model and the engine control model; correcting the parameterized mean value model according to the correction coefficient; the instantaneous specific fuel consumption of the engine is output based on the corrected parameterized mean value model; and calculating the dynamic fuel consumption of the whole vehicle according to the instantaneous specific fuel consumption of the engine in combination with the road spectrum integral of the transmission system of the whole vehicle. By adopting the scheme, the economical efficiency and the calculation efficiency of oil consumption prediction can be improved.

This invention discloses a synchronous control and modeling method for grid-connected converters, including constructing a grid-connected converter topology, designing a multi-mode synchronous control strategy for synchronous generator control, employing a virtual synchronous generator mode when the grid short-circuit ratio is greater than a first threshold and there are no faults; employing fixed-frequency control when the voltage drop is greater than a second threshold; and initiating inertial synchronous control when the frequency deviation is greater than a third threshold. For current limiting control, CLC limiting and PSL / PLL synchronous source coordinated protection are implemented. Based on the converter voltage and current dynamic equations, d-axis and q-axis current reference values ​​are obtained, and different limiting strategies are adopted for different scenarios. An average value model is established using the principle of fundamental frequency dynamic retention and ignoring switching details. Specialized control strategies are designed for photovoltaic, wind turbine, and energy storage systems respectively to achieve coordinated control effects. This invention is applicable to new energy grid connection, DC transmission, and reactive power compensation scenarios, providing support for the stable operation of high-voltage and high-efficiency power systems.

The invention belongs to the technical field of new energy simulation, and discloses a hardware-in-the-loop equivalent modeling and simulation method and device for a wind power flexible direct delivery system. The modeling method comprises the following steps: modeling the converter of the wind turbine generator by adopting a switching function form; carrying out equivalent modeling on the wind power plant current collection line based on a constant power loss principle; a multi-pi cascade structure of a multi-resistor and multi-inductor parallel branch is adopted for modeling of an alternating current sending-out line; carrying out modeling on each bridge arm of the flexible direct current converter station by adopting an average value model; carrying out modeling on a receiving-end power grid by adopting a controlled voltage source and equivalent RLC impedance; and constructing a hardware-in-the-loop simulation equivalent model of the wind power flexible direct delivery system based on the modeling model. According to the method, equivalent processing and model simplification are respectively carried out on each part, the simulation requirement is reduced, meanwhile, the simulation precision and accuracy of the whole system can still be ensured, and finally, rapid and accurate simulation of the wind power through the flexible direct current grid-connected system is realized so as to adapt to the hardware-in-the-loop real-time simulation requirement.

This invention relates to an analytical calculation model for engine torque in real-time control, belonging to the field of engine technology. The model includes analytical calculation models for the engine intake system, the thermodynamic processes of each cylinder, the exhaust system, and the crankshaft dynamics. Based on the engine operating mechanism, this analytical torque calculation model can characterize the fluctuation characteristics of engine output torque compared to traditional average value models, and is suitable for torsional vibration analysis and control of vehicle transmission systems equipped with engines. The model has a clear structure and is computationally simple, requiring no specific solver support for online calculation of engine output torque and the states of various components, and can be used for real-time engine control based on microcontrollers.

The invention relates to the technical field of heat accumulating type combustion, in particular to a control method and system for improving heat accumulating type combustion pressure. A relation model II; an air supply valve is adjusted; until the gas pressure at the gas pipeline detection point, the air pressure at the air pipeline detection point, the smoke exhaust pressure at the gas pipeline detection point and the smoke exhaust pressure at the air pipeline detection point reach the specified range of the current month average value corresponding to the optimal value of the gas heat accumulator nozzle pressure and the optimal value of the air heat accumulator nozzle pressure. The method has the advantages that the pressure value detected in real time is compared with the monthly average value model established on the basis of historical data, the opening degree of the gas supply valve is automatically adjusted, resistance increase caused by ash deposition is compensated, it is guaranteed that the flow of air and gas and the pressure of a hearth are always kept at the optimal value in the whole life cycle of the heat accumulator, and the service life of the heat accumulator is prolonged. And the problems of air-fuel ratio imbalance and furnace pressure fluctuation caused by resistance change are solved.