82results about How to "Reduce reactive power consumption" patented technology

The invention provides an intelligent control method for a traffic light at a highway intersection, and belongs to the technical field of traffic signal light control methods. The intelligent control method comprises the steps of setting a lane and traffic flow detection meter for detecting lane sections of the lane and the traffic flow, setting the traffic light, and setting up an information processor for analyzing and processing the traffic flow and controlling the traffic light. The intelligent control method has the advantages that coexistence of lane blocking and lane idleness is eliminated, and whatever any time periods, any time frames and any reasons, all lane resources of the highway intersection are can be utilized to the maximum extent, intersection traffic efficiency is improved; due to improvement of the traffic efficiency, reactive power consumption of vehicle fuel and energy is reduced to the maximum extent, expenses and time are saved, and waste gas emission is reduced; waiting time for passing of a vehicle driver is relatively reduced in lane sections or time periods with a few traffic flow, impatient emotion of the driver can be effectively relieved, and second rushing, lane rushing and traffic accidents due to the second rushing and lane rushing are reduced.

The invention discloses an alternating current mains supply isolation zero crossing checking circuit combined with low-voltage power line carrier wave communication signal coupling, belonging to the field of low-voltage power line carrier wave communication and control. The circuit comprises a carrier wave signal coupling circuit, a zero crossing checking circuit and a protective circuit, wherein the carrier wave signal coupling circuit receives and sends the carrier wave signal in the carrier wave communication process in a mode of combining series resonance with a coupling transformer, and the active power consumption and the inactive power consumption of a system can be effectively lowered. in the zero crossing detection circuit, a biasing circuit is designed according to the conduction condition of a Darlington tube, the capacitance characteristics and the optocoupling working condition, so as to accurately detect the zero crossing point time of the alternating current mains supply; the carrier wave signal coupling circuit and the zero crossing detection circuit share one protective circuit to prevent impact interference, such as pulse or surge and the like; and strong current and weak current are completely isolated to guarantee system safety. In the alternating current mains supply isolation zero crossing checking circuit, a low-voltage power line carrier wave coupling circuit is combined; the characteristics of components are used for realizing the zero crossing point detection function; the coupling circuit and the detection circuit share one protective circuit, and the whole circuit is easy to realize, thereby correspondingly lowering cost, and lowering the active power consumption and the inactive power consumption of a system; and especially the zero crossing point detection accuracy required for carrier wave communication is guaranteed.

The invention discloses a soft switching high-efficiency wireless charging method based on bilateral phase shifting and frequency adjusting. The DC side of a sending end converter and the DC side of areceiving end converter of a wireless charging system are each connected with a soft switching auxiliary branch circuit, by reasonably controlling the on and off of an auxiliary switching tube and resonating the voltage of a bridge arm into zero before the switching tube is switched on, the zero-voltage on of all sending end switching devices and receiving end switching devices is realized. Meanwhile, according to the soft switching bilateral phase shifting control system, by means of the frequency adjusting method, the switching frequency is the same as the resonating frequency all the time,the loss problem caused by the idle work under detuning can be avoided, and efficiency is further improved. The method is simple in structure and convenient to implement, the soft switching work of the power converters of the wireless charging system is ensured, the partial efficiency of the converters is improved, and the low-reactive loss of original side coils and auxiliary side coils is realized through the frequency adjusting and phase shifting control mode.

A fully automatic EVA secondary foaming disc forming machine belongs to the technical field of rubber and plastic machinery and is composed of an installation frame, a mold station, a cooling system, a heating plate, a turntable, an intensive mold, a drive positioning component and a control system. The installation frame is The hexagonal plane structure is the load-bearing frame of this molding machine. The mold station is a vertical square frame with an upper cover plate and a load-bearing plate. The mold station is composed of six components including a heating mold station and a cooling mold station, which are installed separately. In the middle of each straight side of the installation frame, the cooling system is a closed internal circulation heat exchange system with a refrigerator as a cold source. The turntable is a combined disc structure and is installed around the load-bearing plate in the square frame of each mold station. The intensive mold is an open structure that accommodates multiple product models, and the control system controls the automatic operation of the molding machine according to the preset program parameters. The design of the intensive mold matched with the mold station of the present invention is more than twice the output of the traditional equipment, and the unit energy consumption is only 50-60% of the traditional equipment.

The invention discloses a hydraulic energy-saving fuzzy control system for excavators, which comprises a fuzzy controller, a variable displacement pump regulator, a throttle controller, an engine, a pump and a pressure sensor; the fuzzy controller is connected with the variable displacement pump regulator, the variable displacement pump regulator is connected with the pump, the pump is connected with the pressure sensor, the pressure sensor is connected with the fuzzy controller, the fuzzy controller is also connected with the throttle controller, the throttle controller is then connected with the engine, and the engine is then connected with the pump. The hydraulic energy-saving fuzzy control system for excavators increases the energy transfer efficiency of the system, and reduces idle energy consumption inside a hydraulic transmission system.

The invention belongs to the technical field of motor starting devices and provides a power-consumption-free starter for a commercial refrigeration compressor. The power-consumption-free starter comprises a current transformer L1, a bidirectional controllable silicon T, an inductor L2, a PTC element and a starting capacitor C1. One end of a primary coil and one end of a secondary coil of the current transformer L1 and the T1 pole of the bidirectional controllable silicon T are jointly connected with one end of an alternating current power source. The other end of the primary coil of the current transformer L1 is connected with the leading-out end M of a main winding of the motor, the other end of the secondary coil of the current transformer L1 is connected with the G pole of the bidirectional controllable silicon T, the inductor L2, the PTC element and the starting capacitor C1 are sequentially in series connection between the T2 pole of the bidirectional controllable silicon T and the leading-out end S of an auxiliary winding of the motor, and the combined leading-out end L of the main winding and the auxiliary winding of the motor is connected with the other end of the alternating current power source. The power-consumption-free starter can effectively reduce consumption of reactive power and meet the requirements for energy saving and environment friendliness; a coil of the auxiliary winding can bear large current, and the electrical property is stable; the power-consumption-free starter is good in generality and high in safety.

The invention discloses a method for improving blast furnace hearth cooling efficiency. The method comprises the following steps: dividing the periphery of a blast furnace into (iend+1) symmetrical vertical section areas, calculating the hearth temperature changes and temperature gradients of 2*(iend+1) points in the periphery of the blast furnace; carrying out grading evaluation on the hearth, wherein the temperatures can be divided into three grades: abnormally high temperature, abnormally low temperature, and normal temperature; finally calculating the occurrence numbers of the three situations and the ratios of the points with three temperature grades in all points, and re-adjusting the flow distribution of hearth cooling water according to weight coefficients sigma H, sigma M, and sigma L. According to the corrosion situation in hearth, the cooling water distribution in hearth can be dynamically adjusted to strength the cooling effect in heavy corrosion areas, at the same time, the cooling water consumption is reduced, the cooling performance of the blast furnace cooling system is improved, and the blast furnace heart is prevented from being burnt through.

The invention discloses an isometric segmentation method for aluminum electrolysis cell cathode steel rods. A segmentation gap between two sections of cathode carbon rods is equal to a gap between two sets of anode carbon blocks of an aluminum electrolysis cell; and the two sections of cathode steel rods are symmetrical about the center line of the cathode carbon blocks of the aluminum electrolysis cell. The method is wide in application range, is applied to the production for real measurement, reduces the production voltage fluctuation by near 50%, reduces the level current by about 30%, is more obvious in current stabilizing and energy saving effect, is convenient for segmentation technology operation, and needs no complex design and calculation.

A direct current power transmission system includes a first and a second converter station that are coupled to each other via a direct current link. Each converter station includes a first or second line commutated converter, respectively. Before power reversal the first converter is operated as a rectifier and the direct current is controlled in the first station, while the second converter is operated as an inverter and in the second station the extinction angle of the second converter or the direct voltage is controlled. After power reversal, the first converter is operated as an inverter and the second converter as a rectifier. During power reversal a change is carried out in the first station from control of the direct current to control of the extinction angle of the first converter or to control of the direct voltage, which is performed in synchronization with a change in the second station from control of the extinction angle of the second converter or from control of the direct voltage to control of the direct current.

The invention relates to the technical field of oil field monitoring, in particular to an oil well failure intelligent analysis and decision system and method. The oil well failure intelligent analysis and decision system comprises a data collecting module, a remote measuring and controlling module, a server, a database connecting module and a function module. The data collecting module comprises an electrical parameter collecting module, a temperature sensor, a pressure sensor, a dynamic liquid level measuring instrument, an integrated dynamometer, a flow sensor and a combustible gas detector. The electrical parameter collecting module, the temperature sensor, the pressure sensor, the dynamic liquid level measuring instrument, the integrated dynamometer and the flow sensor are all in communication connection with the remote measuring and controlling module. A production database and an expert database are arranged in the server. The production database is in one-way communication connection with the data collecting module. The expert database is in two-way communication connection with the database connecting module. By building the oil field intelligent analysis and decision expert system, real-time monitoring, analyzing, fault diagnosing and predicting are conducted on the production parameters of an oil well, the cost of the oil field is saved, and manpower and material resources are saved.

The invention discloses a material conveying device for a concrete batching plant. The material conveying device for the concrete batching plant comprises a material conveying barrel. A material inlet and a material outlet are formed in the material conveying barrel. A rotary shaft driven by a driving mechanism to rotate is arranged in the material conveying barrel. A plurality of screw blades are arranged on the rotary shaft. The screw pitches among the screw blades are gradually increased from the material inlet end to the material outlet end. According to the material conveying device for the concrete batching plant, due to the fact that the screw pitches among the screw blades are gradually increased from the material inlet end to the material outlet end, in the conveying process of a material, the material blocking problem caused in the material conveying process can be effectively avoided; the reactive power consumption is reduced. Meanwhile, the conveying of the material is accelerated, and the efficiency is improved.

The invention discloses a soft switching high-efficiency wireless charging method based on bilateral phase shifting and frequency adjusting. The DC side of a sending end converter and the DC side of areceiving end converter of a wireless charging system are each connected with a soft switching auxiliary branch circuit, by reasonably controlling the on and off of an auxiliary switching tube and resonating the voltage of a bridge arm into zero before the switching tube is switched on, the zero-voltage on of all sending end switching devices and receiving end switching devices is realized. Meanwhile, according to the soft switching bilateral phase shifting control system, by means of the frequency adjusting method, the switching frequency is the same as the resonating frequency all the time,the loss problem caused by the idle work under detuning can be avoided, and efficiency is further improved. The method is simple in structure and convenient to implement, the soft switching work of the power converters of the wireless charging system is ensured, the partial efficiency of the converters is improved, and the low-reactive loss of original side coils and auxiliary side coils is realized through the frequency adjusting and phase shifting control mode.