10results about How to "Improve dynamic response speed" patented technology

This application belongs to the field of DC bus voltage control, specifically disclosing a super-spiral sliding mode active disturbance rejection control method based on an RBF neural network, including the following steps: establishing a mathematical model of a bidirectional Buck / Boost circuit; designing an active disturbance rejection controller, which includes a tracking differentiator and an extended state observer; using an RBF neural network to dynamically optimize the gain parameters of the extended state observer in real time; constructing a super-spiral integral sliding mode controller to replace the nonlinear state error feedback loop in the active disturbance rejection controller; calculating a current reference signal based on the output signal of the tracking differentiator and the observation signal of the extended state observer through the super-spiral integral sliding mode controller; generating a drive signal based on the current reference signal to control the bidirectional Buck / Boost circuit to maintain the stability of the DC bus voltage. This application can effectively improve the stability and disturbance rejection capability of the DC microgrid bus voltage.

The application provides a kind of multi-phase LLC-based direct current converter model prediction device and control method, specifically relates to direct current converter energy conversion technical field.The device includes two-stage converter cascade, input port has S, output port has N.The front stage is composed of S Buck circuits in parallel, each Buck circuit contains an inductor and two MOS tubes;The back stage is composed of N-phase LLC resonant converter, connected with the output port of the front stage Buck circuit.The front bridge of N-phase LLC resonant converter adopts half-bridge circuit, including two MOS tubes, resonant inductor, resonant capacitor and excitation inductor.The device adopts model prediction control method, the output voltage of next cycle is predicted to adjust relevant variables to maintain the purpose of output voltage.The application can access multiple voltage levels, model prediction control can be performed on direct current converter, voltage of specified voltage level can be output, voltage output can be effectively adjusted, and the demand of multi-scene application can be met.

This disclosure provides a disturbance suppression method for grid-connected energy storage converters. By introducing an improved timing disturbance observer, it achieves rapid and accurate estimation of lumped disturbances such as grid voltage fluctuations and load abrupt changes. Combined with an adaptive sliding mode control algorithm, it dynamically adjusts the switching gain based on the sliding mode surface error, forming an observation-compensation closed-loop suppression mechanism. Simultaneously, relying on a multi-loop collaborative architecture consisting of voltage outer-loop sliding mode control, current inner-loop PR control, and capacitor voltage balance PI control, it achieves hierarchical suppression and decoupled control of multi-dimensional disturbances. Furthermore, it introduces a parameter adaptive optimization mechanism based on disturbance characteristics and device temperature, thereby significantly improving the dynamic response speed and steady-state accuracy of the system under weak grid conditions and complex operating conditions, reducing the DC voltage fluctuation amplitude, and comprehensively improving the system's stability, power quality, and wide-temperature-range operational reliability.

The application discloses a digital integral mode constant conduction time control system and method of a switching power supply, and the system comprises: a pulse signal output by a DIMCOT control module in a load change transient state is used to control a PWM waveform of a PWM generation module to change from a first level state to a second level state, a counter of a constant conduction time generation module is triggered to start counting according to the second level state, and when a count value reaches a preset value, a reset signal is generated, so that the PWM waveform of the PWM generation module changes from the second level state to the first level state, thereby obtaining a square wave signal with a preset duty cycle, and then the opening or closing of the switching power supply is controlled, and the constant conduction time of the switching power supply is realized. Thus, the switching period is changed in the load change transient state to quickly increase the PWM duty cycle, there is no inertia link in linear control, the system delay is reduced, and faster transient response, higher light load efficiency and more flexible control strategy are achieved.

The utility model provides a kind of elastic cycloidal pin gear reducer, comprising: driving part, cycloidal transmission part and elastic buffer part;The driving part includes motor top shell, conveying sleeve, motor shell, motor stator and motor bottom shell, the conveying sleeve is installed in the top of the inner wall of motor shell, the motor stator is installed in the inside of motor shell, the motor bottom shell is installed in the bottom of motor shell.The utility model provides a kind of elastic cycloidal pin gear reducer, compared with traditional inner rotor motor axial dimension shorter by the use of motor top shell, conveying sleeve, motor shell, motor stator and motor bottom shell, the double closed-loop feedback of cooperation motor encoder and output encoder, power response speed is accelerated, adapts to the scene of high dynamic performance requirement such as industrial robot joint.

The utility model discloses a replaceable air filter core air inlet pressure stabilization chamber, internal combustion engine and unmanned plane, include: the pressure stabilization chamber body, its inside constitution is used for stabilizing the main cavity of airflow, throttle flange, set up in the upstream end of pressure stabilization chamber body, be used for connecting throttle body, air inlet flange, set up in the downstream end of pressure stabilization chamber body, be used for connecting engine, air filter core box, it is connected with the installation mouth of being set up on the pressure stabilization chamber body wall surface in detachable mode to embed in main cavity, air filter core, its accommodation is in the inside of air filter core box, wherein, the airflow of flowing through throttle flange is after entering main cavity, passes through air filter core and filters, finally is transported to engine through air inlet flange.

This invention discloses a high-order all-drive motor modeling and control method based on a strict feedback structure, belonging to the technical field of motor control. The method includes: establishing fundamental electrical-mechanical-force coupling equations to describe the coupling relationship between the electrical subsystem, mechanical motion subsystem, and electromagnetic thrust subsystem; performing Taylor expansion on the fundamental coupling equations and constructing coupled dynamic equations by combining instantaneous electric power; converting the coupled dynamic equations into a high-order strict feedback nonlinear system model; converting the high-order strict feedback nonlinear system model into a high-order all-drive model; constructing a trajectory tracking control law; solving for the feedback gain vector using a parameterized configuration method; and performing Lyapunov stability analysis on the all-drive closed-loop LSRM system to ensure system stability and tracking performance. This invention provides a unified modeling of the high-order nonlinear coupling relationship of linear switched reluctance motors, effectively preserving the physical characteristics of the system, improving model accuracy, and expanding the applicable operating conditions of the system.

This invention discloses a method for integrating frequency detection function into a software phase-locked loop (PLL) of a three-phase converter, relating to the field of data processing. The method includes the following steps: Step S1, obtaining the grid voltage in a three-phase stationary coordinate system and converting it into a coordinate system grid voltage. Compared with existing technologies, the advantages of this invention are: This invention overcomes the limitations of low-bandwidth PLLs on frequency response, significantly improving the dynamic response speed and steady-state accuracy of frequency detection, while also possessing good anti-interference capabilities, solving the problem of balancing response speed and detection accuracy in traditional solutions; without changing the PLL PI parameters to ensure converter impedance stability and weak grid adaptability, the calculated real-time angular frequency is used as a feedforward value to replace the fixed feedforward, effectively improving the PLL's tracking speed for grid frequency changes; and it saves software resource costs.

The invention discloses a grid-connected inverter stability control method based on an improved phase-locked loop, and belongs to the technical field of new energy grid-connected control, and the method comprises the steps: firstly building a grid-connected inverter impedance model, and revealing a mechanism that the phase-locked loop introduces negative damping and reduces stability margin under a weak power grid; based on an impedance model, a composite control strategy fusing dynamic feed-forward compensation and an improved Kalman observer is designed, the former actively counteracts the negative impedance effect of a phase-locked loop, and the latter improves dynamic response through state reconstruction and advanced prediction. Finally, an improved cascade delay signal elimination phase-locked loop with a selective conduction harmonic filtering function is provided, and the improved cascade delay signal elimination phase-locked loop is deeply integrated with the control strategy and a multi-harmonic feedback link, so that high-precision phase locking and active harmonic suppression are realized. According to the method, the operation stability, the dynamic performance and the electric energy quality of the grid-connected system under the conditions of high background harmonic waves and weak power grids are remarkably improved.

The application discloses a dynamic liquid level detection system and method based on a stirred tank, and belongs to the field of liquid level detection. The system comprises a differential pressure sensor module, a rotating speed acquisition module and a signal processing unit. The signal processing unit comprises a vortex dynamic compensation module, an adaptive filtering module and a delay prediction compensation module connected in series. The application collects the differential pressure signal of the liquid column in the tank and converts it into an apparent liquid level value, and simultaneously collects the rotating speed signal of the stirring paddle. The liquid level deviation caused by the vortex at the tank wall is calculated according to the rotating speed signal, and a first-order recursive tracking output dynamic compensation is used to eliminate the vortex liquid level deviation. The low-pass filter cutoff frequency is adaptively determined according to the rotating speed signal to suppress the stirring fluctuation noise. The change rate of the filtered liquid level value and the group delay are used for forward prediction correction to reduce the filtering delay. The application realizes dynamic cooperation of each link by using the rotating speed signal as a link, and improves the accuracy and response speed of the liquid level measurement under the stirring condition.