33results about How to "Adjustment science" patented technology

The invention relates to a method and system for evaluating the dynamic energy stability of a double-fed fan grid-connected system, which belongs to the technical field of wind power generation systems and solves the problem of low stability assessment accuracy of the existing wind turbine grid-connected system. The method comprises the following steps: when subsynchronous oscillation occurs in the doubly-fed wind turbine grid-connected system, collecting instantaneous values ​​of voltage and current at the grid-connected point of the wind turbine and the series compensation place; based on the instantaneous voltage and current values ​​at the grid-connected point of the wind turbine and the series compensation place, obtaining The dynamic energy of the double-fed fan grid-connected system; collect the dynamic energy of the double-fed fan grid-connected system with an integer period, and extract the aperiodic component from it; if the change rate of the aperiodic component is positive, the double-fed fan The grid-connected system has negative damping characteristics, and the oscillation diverges; on the contrary, the double-fed fan grid-connected system has positive damping characteristics, and the oscillation converges. The method in the invention can accurately and effectively evaluate the stability of the double-fed fan grid-connected system.

The invention discloses a two-sided dewatering upper squeezing belt filter press for a wedge-shaped pressurizing sawtooth groove. The two-sided dewatering upper squeezing belt filter press mainly comprises a rack, a squeezing region, a drive device, a feeding and pulp spraying device, a wedge-shaped pressurizing sawtooth groove two-sided dewatering plate, a rotary dewatering device, a scraper discharging device, a correcting device, a pneumatic tensioning device, a water spraying cleaning device and a water receiving tank device. The wedge-shaped pressurizing sawtooth groove two-sided dewatering plate is divided into an upper filter net and a lower filter net, an included angle being greater than 0 degree and less than 3 degrees is formed between the upper filter net and the lower filter net, a wedge-shaped pressurizing sawtooth groove two-sided dewatering feeding hole is larger than a discharging hole, the pressurizing is achieved according to operation of the filter nets, the two-sided dewatering effect is achieved according to the sawtooth groove and a circular hole of the dewatering plate, the drive device comprises a motor and a gearbox, so that the dewatering effect is greatly improved; meanwhile, the service life of a filter strip can be effectively prolonged, and the operation energy consumption of the filter press can be reduced.

The invention provides a heat network steam supply pressure control method and system for a thermal power plant. The heat network steam supply pressure control method comprises the following steps that S1, steam flow and pressure intensity at an inlet of a steam conveying pipeline are obtained; S2, steam flow and pressure intensity at a steam conveying transfer station are obtained; S3, steam flowand pressure intensity at an user outlet are obtained; S4, a steam flow mathematical model and a pressure intensity mathematical model are established; S5, according to a set steam flow value at theuser outlet and an obtained steam flow value at an inlet of the steam conveying pipeline, the steam flow mathematical model in the S4 is combined, the steam flow rate of the steam conveying transfer station is adjusted inversely, meanwhile, according to a pressure intensity value at the user outlet and a pressure intensity value at the inlet of the steam conveying pipeline, the pressure intensitymathematical model in the S4 is combined, and the pressure intensity of the steam conveying transfer station is adjusted inversely. The heat network steam supply pressure control method and system forthe thermal power plant can scientifically adjust the pressure intensity and flow information of the pipeline in order to obtain normal steam heat supply at the end user pipeline.

The invention relates to the technical field of largemouth bass cultivation, and especially relates to a bait feeding system based on body lengths of largemouth basses. The system is used to accurately adjust feeding amount of largemouth bass baits according to variations of the body lengths of the largemouth basses in a largemouth bass cultivation process. The system comprises a data storage module, a data updating module, a largemouth bass body length acquisition module, a data analysis module, and a bait feeding control module. The largemouth bass body length acquisition module is used to detect body lengths of the largemouth basses in breeding water in real time. The data analysis module is used to compare the real-time acquired body length data of the largemouth basses with body length and weight data of the largemouth basses in the same kind, the body length and weight data being stored in the data storage module, and calculating total feeding amount of baits. The bait feeding control module is used to control feeding amount of the largemouth bass bait and execute feeding. The bait feeding system based on body lengths of largemouth basses can scientifically and rationally automatically feed baits according to differences of body lengths and weight of the largemouth basses, so as to reduce residual bait amount in the breeding water, reduce amount of micro-particles, reduce the number of filtering and treatment of the breeding water, reduce production cost, and save electric power and manpower resources.