4results about How to "Improve the compensation effect" patented technology

The application provides a dynamic prediction method for a coal-fired power plant SCR denitration system based on a parameter identification mechanism-data hybrid model, and relates to the technical field of intelligent modeling and prediction. x The mechanism prediction value of the NO x The application establishes an SCR dynamic mechanism model, completes parameter identification based on historical operation data, obtains the mechanism prediction value of the NO x Concentration and ammonia escape amount, constructs a series model of liquid neural network and long short-term memory network to learn the mechanism model prediction deviation, weights and fuses the mechanism prediction value and the prediction deviation, forms a hybrid model with physical consistency and dynamic adaptability, and realizes high-precision and stable prediction of the SCR outlet NO x Emission and ammonia escape amount under variable load conditions.

This utility model relates to the field of wind power testing technology and discloses a connecting rod coupling for a wind power test bench, solving the problems mentioned in the background art. It includes: a connecting rod coupling for connecting a power source and the test equipment, capable of transmitting power and compensating for deviations during operation; a left transition flange weldment connected to one end of the connecting rod coupling for connecting to the power source; a right transition flange assembly weldment connected to the other end of the connecting rod coupling for connecting to the test equipment; and a tie rod middle section connecting the left and right transition flange weldments, the tie rod middle section providing tension to maintain the structural stability of the coupling. This utility model achieves high load-bearing capacity, efficient deviation compensation, and significant buffering and vibration reduction effects, effectively ensuring the stability and reliability of the wind power test bench during long-term, high-load operation.

The utility model relates to the technical field of expansion joint, specifically relates to a shock absorption expansion joint for heat supply and heating pipeline, both sides of one of two connecting plates are fixedly connected with side frame, and the inside of two side frames is equipped with inner plate, and one end of two inner plates is fixedly connected with the both sides of another connecting plate respectively, fixedly connected with telescopic link between two supporting plates, and the telescopic link is equipped with extrusion spring, and the both ends of extrusion spring are fixedly connected with the side of two supporting plates respectively, through setting up the structure of expansion joint pipe and extrusion spring cooperation effect between two connecting plates, the active buffering mechanism is increased on the basis of traditional bellows or rubber spare, can provide stable elastic support when the pipeline system is heated expansion or contraction, effectively absorbs high frequency vibration, pressure fluctuation and thermal stress impact, avoids the fatigue damage and sealing failure caused by rigid connection, reaches the effect of improving shock absorption effect and structural stability.

A fast reactive current control method and system for converters based on centralized sampling on the grid side is proposed. Based on the spectral characteristics of composite harmonics, a clustering method is used to obtain the cluster center harmonic frequency bands of multiple frequency bands. The resonant peaks are determined based on the principle that each resonant peak covers two adjacent cluster center harmonic frequency bands. The reduction ratio of the delay time in the repetitive controller is determined based on the frequency of each resonant peak and the fundamental frequency, resulting in an improved fast repetitive controller. The delay element in the feedback branch of the improved fast repetitive controller is decomposed into an integer-order delay element and a fractional-order delay element connected in series. The fractional-order delay element is compensated to obtain a compensated fast repetitive controller. The fast repetitive composite controller obtained by connecting the compensated fast repetitive controller in parallel with a PI controller serves as the improved current inner loop. Based on the voltage outer loop and the improved current inner loop, fast reactive current control is achieved, realizing rapid reactive current compensation.