8results about How to "Improve transient performance" patented technology

This invention discloses a distributed adaptive fault-tolerant control method and system for nonlinear inline systems, relating to the field of distributed control technology for nonlinear inline systems. The method includes: for each subsystem in the nonlinear inline system, constructing the actual output of each actuator in the subsystem based on the fault type of the actuator; the nonlinear inline system includes several subsystems; for each subsystem, constructing a local objective function, an error optimizer, an auxiliary system, high-gain parameters, and a control law, and generating an optimal error trajectory based on the local objective function and the error optimizer. At the upper level, this invention designs an error optimizer to generate the optimal error trajectory based on a local objective function that converges to zero; at the lower level, it designs a trajectory tracking fault-tolerant controller with the help of an auxiliary system, employing a dynamic high-gain approach to adaptively handle the effects of uncertain parameters, actuator faults, and unknown strong inline coupling.

The present application belongs to the technical field of networked converter control, and discloses a networked converter control method, system, device and medium based on network side information feedback to solve the problem of subsynchronous oscillation. The method comprises: collecting voltage signals of a grid side point of common connection and voltage signals and current signals of a converter side; calculating steady-state active power and steady-state reactive power based on the voltage signals of the grid side point of common connection and line impedance parameters; calculating transient active power and transient reactive power based on the voltage signals and current signals of the converter side; introducing a composite factor to fuse the steady-state active power and the transient active power to obtain composite active and reactive power; and inputting the composite active and reactive power to a power outer loop controller of the networked converter to generate a reference signal for inner loop control. The present application improves system damping and the ability to suppress subsynchronous oscillation.

The application belongs to the technical field of power management integrated circuits, and particularly relates to a low-voltage power rail circuit applied to a high-side floating basin of a motor driving circuit. The circuit realizes a stable power rail in the floating basin through a super source follower architecture and a bias of MOS tube threshold tracking. The circuit has the advantages that it can track the MOS tube threshold voltage to realize lower static power consumption, can realize fast transient response under different load conditions, has good anti-dv / dt noise capability, and can realize small overshoot voltage during load switching under small decoupling capacitance, thereby reducing the circuit area.

The application discloses a kind of under the FDI network attack of reinforcement learning dual-motor safety coordination control method, comprising the following steps: (1) the double-time scale mathematical model of flexible coupling dual permanent magnet synchronous motor system is established;(2) the FDI network attack model of double-time scale mathematical model is established;(3) design safety coordination controller based on LQR theory;(4) according to the FDI network attack model of step (2) established, design model-free reinforcement learning, the safety coordination controller of step (3) is iteratively solved;The method avoids the influence caused by FDI network attack to system, using reinforcement learning algorithm can not depend on model data, avoid the influence of motor parameter change to system;For improving the coordination control performance of networked dual permanent magnet synchronous motor coordination control system and guarantee network security has important significance.

An electric sound stethoscope with double-channel compatible and collection switch relates to the field of medical auscultation, which is configured with double-channel compatible and convenient collection switch, analyzes and compares sound and sound wave pattern functions, and outputs two high-definition loudspeaker work of audio amplifier modules in two ways to connect two audio boxes, which is a new innovation for diagnosing heart and lung diseases. The excellent electric sound quality presents the extremely distinctive creative color of the system. The system includes electronic or traditional auscultation head to collect sound signals, and the sound signals are converted into electric sound signals by a microphone. The auscultation includes collecting heart and lung sound, and independently setting a microphone channel or a microphone wired socket interface with a convenient switch, forming the electric sound signal of the heart and lung auscultation collected by the convenient switch and the auscultation method to suppress howling. The electric sound signal enters the functional module circuit for processing through the appropriate transmission mode, amplifies the electric sound signal to drive the loudspeaker to broadcast and listen to the auscultation.

The invention discloses an air supply device and method for a cathode closed electric pile or a methanol fuel cell. The device comprises a high-speed brushless direct current motor, a centrifugal impeller directly driven by the high-speed brushless direct current motor, a volute for packaging the impeller and an electronic control unit. The impeller and the volute are pneumatically optimized, so that the device has high efficiency and a wide stable working area under the back pressure of 1-10kPa. The electronic control unit takes the load current of the electric pile as a main feed-forward signal, quickly sets the target rotating speed of the motor through a built-in mapping table, and realizes accurate tracking by adopting a rotating speed closed loop. The control unit is integrated with mechanisms such as self-learning compensation, anti-disturbance quick response, safety protection and anti-integral saturation. According to the invention, the harsh requirements of a miniaturized fuel cell system on high back pressure, fast response, small size and long service life of an air supply component are met.

The application discloses a kind of based on variable gain fixed time observer's unmanned ship path tracking control method, the present application relates to ship motion control technical field, especially based on variable gain fixed time state observer's unmanned ship path tracking control method, include the following steps: step (1): establish unmanned ship geodetic coordinate system reconstruction mathematical model;Step (2): design dynamic error envelope and adaptive time scaling factor;Step (3): construct the variable gain fixed time extended state observer of same quality;Step (4): design backstepping path tracking controller based on dynamic surface technology;Step (5): simulation verification.The present application wants to solve the problem that unmanned ship is low in tracking accuracy under complex sea conditions and "fast tracking" and "noise suppression" is difficult to take into account, by introducing error dynamic envelope and adaptive gain adjustment mechanism, to improve the transient convergence speed and steady-state noise performance of path tracking.

The invention relates to the technical field of energy storage converters, and provides a transient performance improvement control method and system for a network construction type energy storage converter, and the method comprises the steps: employing an active reference adjustment coefficient to adjust an active power reference value for active power, calculating the deviation between the active power and the active power reference value, and obtaining a phase angle through an active ring; for reactive power, the deviation between the reactive power and a reactive power reference value is calculated, and internal potential is obtained through a reactive ring; by controlling the on-off of the first switch, the internal potential is used as the input of the impact current suppression ring during normal operation, and the voltage regulation parameter is used as the input of the impact current suppression ring when a power grid has a fault; and the impulse current suppression ring obtains the output of the impulse current ring by controlling the on-off of the second switch and controlling the input or exit of the impulse current suppression impedance, obtains a modulation signal through the voltage ring and the current ring, and generates a driving pulse of each power switch device. And the transient performance, the robustness and the engineering applicability are obviously improved.