12results about How to "Reduce oscillation" patented technology

This invention discloses a method and system for detecting and correcting mismatches in time slices and processor frequencies between task groups, relating to the field of automatic control and regulation of computer system resources, specifically a collaborative closed-loop correction method for operating system scheduling and processor frequency control. The method identifies a target task group and a control task group, statistically analyzes the average effective time slices and average effective frequencies of the two task groups within an observation window, constructs time slice differences and frequency differences, and calculates a mismatch index based on the service quality deviation of the target task group to determine the mismatch mode. Correction actions are generated for different modes, performing time slice parameter compensation on the target task group and / or applying frequency constraint compensation to its running processor. Stability is ensured through upper bounds on amplitude, trigger frequency limits, hysteresis / cooling, and abnormal backoff, thereby reducing long-tail latency, frame drop risk, and unnecessary power consumption under mixed loads.

This invention relates to an energy-saving and efficient combustion control method and system for industrial furnaces, belonging to the field of industrial furnace automatic control technology. The method includes: acquiring the industrial furnace zone number; obtaining the corresponding target temperature and current temperature based on the industrial furnace zone number; calculating the temperature difference based on the target temperature and current temperature; when the temperature difference is less than a preset temperature difference threshold, finding the corresponding PID parameter based on the industrial furnace zone number; calculating a first required fuel amount based on the temperature difference and the PID parameter; controlling the zone corresponding to the industrial furnace zone number to add fuel according to the first required fuel amount; when the temperature difference is greater than the preset temperature difference threshold, finding a proportionality coefficient based on the industrial furnace zone number; calculating a second required fuel amount based on the temperature difference and the proportionality coefficient; and controlling the zone corresponding to the industrial furnace zone number to add fuel according to the second required fuel amount. This invention effectively reduces energy waste in industrial furnaces.

The invention discloses a photovoltaic MPPT (Maximum Power Point Tracking) control algorithm, which relates to the technical field of photovoltaic control algorithms, utilizes the characteristics of simple structure, high convergence speed, high global optimization capability, wide applicability and the like of a gradient optimization algorithm, and improves the defects of premature convergence and sensitivity to control parameters of the gradient optimization algorithm. Meanwhile, the photovoltaic output energy efficiency and the stability of the photovoltaic output energy efficiency serve as the evaluation basis, an MPPT algorithm performance evaluation model is constructed through an analytic hierarchy process, photovoltaic MPPT performance is evaluated, and GTO performance is verified and improved.

This invention belongs to the field of automatic control technology, specifically relating to a parameter adaptive optimization control method for a carrier gas evaporator-condenser. The method includes: acquiring and denoising the inlet carrier gas temperature, outlet carrier gas temperature, inlet carrier gas volumetric flow rate, inlet carrier gas relative humidity, and real-time spray water flow rate to obtain an effective operating dataset; acquiring the instantaneous heat transfer power at the sampling time based on the effective operating dataset; obtaining the evaporation efficiency ratio coefficient based on the instantaneous heat transfer power; acquiring the adaptive control gain based on the deviation between the evaporation efficiency ratio coefficient and a preset benchmark efficiency coefficient; compensating for the pressure deviation value of the condensing pressure using the adaptive control gain; and acquiring and issuing target frequency commands to the variable frequency drive devices for the fan and the spray water circulation pump. This invention solves the problem that control parameters cannot be dynamically adjusted according to environmental load, reduces energy consumption, and improves the stability of condensing pressure control.

The present application belongs to the field of unmanned aerial vehicle precise landing control, and specifically proposes an unmanned aerial vehicle precise landing delay compensation control method; first, the sampling time and output time of the on-board sensor of the unmanned aerial vehicle are obtained, the input and output time of the calculation module is calculated, and the input and output time of the control instruction transmission process is calculated, so as to obtain the delay time length of the whole process; then, the segmented approximate accumulation method is used to calculate the position of the unmanned aerial vehicle in the delay stage; then, the moving target position of the unmanned aerial vehicle is corrected; finally, according to the corrected target position, the speed and acceleration of the unmanned aerial vehicle are determined in combination with the rule base. Using the position compensation method, the position deviation of the unmanned aerial vehicle in the delay stage can be corrected, which provides a basis for position control. The fuzzy control strategy better suppresses the overshoot, reduces the horizontal position oscillation of the unmanned aerial vehicle during landing, and shortens the landing time.

The application relates to the technical field of computer system evaluation, and particularly discloses an evolvable and reliable cloud level calculation system and method based on game optimization; the method comprises the following steps: in the first stage, a pair comparison matrix is established based on the theory of trusted computing dependency tree and the analytic hierarchy process to generate a static weight vector; in the second stage, multi-source threat data is collected through an AI model, a double comparison matrix is constructed through double-dimension labeling classification, and a dynamic weight vector is output; through game theory, an antagonistic pair of core security mechanisms is identified, an antagonistic gradient and the dynamic weight vector are calculated, a weight convergence interval and a level promotion upper bound are predicted, and an optimal weight evolution path is generated; the system is used for realizing an evolvable and reliable cloud level calculation method based on game optimization; and the application is favorable for improving the adaptability and predictability of cloud security evaluation and providing a decision basis for cloud service security optimization.

The application discloses a power coordination control method of a charging system and relates to the technical field of charging piles, and comprises the following steps: S1: acquiring three-phase voltage of a power grid in real time, obtaining three-phase safe voltage of the power grid through the three-phase voltage of the power grid, acquiring a maximum allowable working current, acquiring a power factor, obtaining a maximum power limit value of a PCS through the three-phase safe voltage of the power grid, the maximum allowable working current and the power factor; when a charging gun is converted from slow charging to fast charging and proposes a power up-regulation request, whether there is a power up-regulation space is judged through a total output power and the maximum power limit value of the PCS, so that different power up-regulation strategies are formulated according to the size of the up-regulation space, which is beneficial to avoiding PCS overcurrent faults caused by uncontrollable sequences of power adjustment, and is also beneficial to improving the safety of power adjustment, so that circuit oscillation is smaller and more stable and safe.

This invention discloses an SCR ammonia injection control method and system. First, a PLS regression is constructed by collecting signals such as inlet / outlet NOx, flue gas volume, temperature, oxygen content, and ammonia flow rate. The regression coefficients are then used as state variables and updated online adaptively by Kalman filtering. Next, the ammonia injection quantity is calculated using SCR stoichiometry as feedforward, and model-based feedback correction and inlet NOx slope disturbance feedforward are introduced. Combined with operating condition fluctuation detection, valve smoothing, and amplitude limiting, ammonia injection valve commands are generated, achieving stable control of outlet NOx near a narrow-band setpoint, reducing ammonia consumption and valve adjustment frequency.

The application discloses a fuzzy PI PWM control method applied to a BOOST circuit and belongs to the technical field of power electronics. According to the method, the initial values of a group of proportional coefficients and integral coefficients with the highest boost efficiency are debugged in advance, fuzzy PI control parameters are generated, proportional coefficient correction amounts and integral coefficient correction amounts corresponding to different output voltage deviation amounts and output voltage change rates are generated and stored in a memory in a table form, then the output voltage is sampled at a fixed time, the output voltage deviation amount and the output voltage change rate are calculated, the proportional coefficient correction amount and the integral coefficient correction amount are quickly obtained by table lookup, and then the next round of proportional coefficient and integral coefficient are calculated and used for PI control of a voltage loop. The method improves the tracking precision of the output voltage, avoids the need for fuzzy PI recalculation each time, significantly reduces the number of floating point operations in adaptive fuzzy PI control, and reduces the operation burden of a single-chip microcomputer.

The application provides a low-voltage large-current battery charging method and system based on a hybrid control full-bridge architecture, and relates to the technical field of power electronics. The method comprises the following steps: determining a load index representing a charging load state; in response to the load index satisfying a mode switching condition, establishing a state mapping relationship between a current control mode and a target control mode of a full-bridge power conversion unit, wherein one of the current control mode and the target control mode is a PWM control mode, and the other is a second control mode for output control by adjusting a switching frequency and / or a bridge arm phase difference; based on the state mapping relationship, converting a current control state in the current control mode into a starting control boundary corresponding to the target control mode, and controlling the full-bridge power conversion unit to switch to the target control mode. The scheme is beneficial to improving the state mismatch problem during switching of different control modes in a low-voltage large-current charging scene, and improving the cross-condition operation stability.

The application provides a kind of loudspeaker sound optimization system and method, belongs to loudspeaker technical field, containing loudspeaker support, the loudspeaker support is equipped with loudspeaker body, the outside of the loudspeaker support is fixedly connected with connecting outer ring;The outer circumferential surface of the connecting outer ring is fixedly connected with assembly outer ring, and the assembly outer ring is reserved with mounting hole;The upper and lower two side rods on the loudspeaker support are equipped with anti-oscillation module;The other end of the anti-oscillation module is equipped with assembly rod.The application solves the problem that the existing loudspeaker lacks structure to reduce oscillation, and the loudspeaker will produce oscillation during work, which will cause the components to touch each other, and noise will be generated when touching, which will cause the sound quality played by the loudspeaker to deteriorate during work, and the oscillation will also cause the connection between parts to be loose or even detached.

The present application relates to the technical field of oscillation suppression, and provides a wide-band oscillation suppression method and system for offshore wind power flexible direct current system, which comprises: a direct current part transmitted from an offshore converter station to a land converter station, wherein a virtual resistance is introduced by adding a damping controller in a control system of an MMC to suppress the medium and low frequency oscillation on the direct current side; a passive damping structure and an active low-pass filter are added in the MMC bridge arm structure to suppress the high frequency oscillation on the direct current side; an impedance controller is added in the MMC alternating current side of the converter station to suppress the medium and low frequency oscillation on the alternating current side in the alternating current part from each motor of an offshore wind farm to the offshore converter station; and a passive damping structure and an active low-pass filter are added in the MMC alternating current side bridge arm structure of the converter station to suppress the high frequency oscillation on the alternating current side. The damping characteristics of each frequency band on the alternating current and direct current sides are comprehensively improved, the wide-band oscillation and negative damping risk are eliminated from the source, and multiple types of wide-band oscillation are effectively suppressed.