14results about How to "Reduce reactive power" patented technology

The invention relates to the field of high-voltage electricity saving, in particular to an electromagnetic balance winding high-voltage electricity-saving device which comprises a shell, an electricity-saving assembly and an installation assembly. According to the invention, the installation assembly is installed in the shell to provide supporting force for the power-saving assembly, so that each part in the power-saving assembly can be ensured to be in a stable working position, the stable installation is beneficial to reducing electromagnetic interference generated by shaking or displacement between the parts, a better power-saving effect is realized, and the service life of the power-saving assembly is prolonged. The oil temperature controller can monitor the oil temperature in the oil drum of the transformer, when the oil temperature is too high, the performance of electrical equipment in the device can be affected possibly, the electric energy loss is increased, and meanwhile the transformer burnout consequence caused by current overload can be caused possibly, and through monitoring of the oil temperature controller, measures can be taken in time to control the oil temperature, so that the oil temperature is effectively controlled. The power-saving efficiency of the device is prevented from being reduced due to too high oil temperature, the burning risk caused by current overload is eliminated, the device is ensured to operate in a high-efficiency state, and safety and energy conservation are realized.

The application discloses a permanent magnet electric drive aluminum strip tension leveling machine process parameter optimization method and system, and belongs to the technical field of metal material finishing. The method comprises the following steps: system initialization is performed, and a coupling mathematical model between process parameters and electromagnetic drive control variables is established; based on the established model, a hierarchical strategy including process parameter pre-selection, drive parameter multi-objective optimization and online fine adjustment is adopted, and an optimal process parameter set is dynamically solved; heat compensation is performed on the current instruction output by the optimization according to the real-time temperature of the permanent magnet motor, so as to offset the torque attenuation caused by temperature rise; and case data of each successful tension leveling is stored in a knowledge base, so that online self-learning and inheritance of experience are realized. The application solves the problems of straightening quality fluctuation, high energy consumption and short service life of components caused by mismatching of the permanent magnet direct drive system and traditional process parameters, and significantly improves the elongation control precision, surface quality and energy efficiency.

The utility model discloses a distributed photovoltaic box transformer substation, which comprises a high-voltage chamber, a low-voltage chamber and a transformer chamber which are arranged in a delta shape, a transformer is arranged in the transformer chamber, a combined vacuum circuit breaker, a metering current transformer, a confluence cable and an outgoing cable are arranged in the high-voltage chamber, the combined vacuum circuit breaker is connected with the confluence cable, and the metering current transformer is connected with the outgoing cable. An SVG high-voltage chamber is further arranged on the side, away from the transformer chamber, of the high-voltage chamber, an SVG vacuum circuit breaker and an SVG incoming cable are arranged in the SVG high-voltage chamber, and the SVG vacuum circuit breaker is communicated with a reactive power compensation device outside the SVG high-voltage chamber through the SVG incoming cable. According to the invention, reactive power is compensated through the reactive power compensation device, so that the power factor of the system is maintained within a reasonable range. The invalid power in the power grid is reduced, and the efficiency of the power grid is improved. Meanwhile, the voltage of the power grid can be adjusted and kept at a stable level, the voltage fluctuation of the power grid can be reduced, and the stability of the power grid is improved.

The invention relates to the field of charging pile power supply modules, and discloses a circuit structure for reducing standby reactive power of a charging pile power supply module, which comprises an alternating-current power grid, a relay assembly, an auxiliary power supply circuit with two power taking circuits and a filter circuit, and is characterized in that the alternating-current power grid is connected with the relay assembly, and the relay assembly is connected with the filter circuit; the two electricity taking circuits of the auxiliary power supply circuit are respectively connected with the relay assembly and the filter circuit, the relay assembly and the filter circuit output voltage to the auxiliary power supply circuit, during standby work, reactive power of the EMC filter circuit can be reduced, meanwhile, the control circuit is powered on, communication signals can be kept smooth, and starting can be conducted at any time; during normal work, a newly added auxiliary power supply electricity taking access can be cut off through the small relay, a better EMC filtering effect is obtained, and the electric energy conversion efficiency is higher.

The invention discloses a nested structure carbon / carbon composite material thermal insulation assembly and a preparation method thereof. The heat preservation assembly comprises an inner cylinder, an outer cylinder, an upper connecting ring, a lower connecting ring and a core body, the outer cylinder is arranged on the outer side of the inner cylinder in a sleeving mode, the outer cylinder and the inner cylinder are connected with the upper connecting ring and the lower connecting ring through bolts, a closed isolation cavity is formed among the inner cylinder, the outer cylinder, the upper connecting ring and the lower connecting ring, and the core body is arranged in the isolation cavity; the inner cylinder, the outer cylinder, the upper connecting ring, the lower connecting ring and the bolt are all made of a carbon / carbon composite material; and the core body is formed by laminating a plurality of layers of carbon fiber soft felts and a plurality of layers of graphite paper. According to the heat preservation assembly, the erosion effect of heat and erosion gas on the core body can be effectively avoided, the heat insulation effect is better, the actual thickness of the heat insulation functional layer can be effectively reduced, and the use amount of heat preservation materials is reduced.

The invention provides a control strategy optimization method based on fundamental wave circulating current, which is applied to a three-active bridge DC-DC converter and comprises the following steps: collecting the middle-point voltage of each port in the three-active bridge DC-DC converter; determining a phasor relationship between the midpoint voltage and the inductive current between the ports based on the midpoint voltage of each port; determining the active power and the reactive power of the second port and the active power and the reactive power of the third port based on the phasor relationship between the midpoint voltage and the inductive current between the ports; and based on the active power and the reactive power of the second port and the active power and the reactive power of the third port, an optimized phase shift ratio combination is determined, and the optimized phase shift ratio combination is used for realizing control of the three-active-bridge DC-DC converter. According to the optimization control strategy provided by the invention, the reactive power of the TAB can be effectively reduced, the optimization control strategy is more obvious under the light load condition, and the system operation efficiency is improved.

This utility model proposes a deep integration primary and secondary FTU power harvesting circuit system for power distribution networks, comprising: a voltage divider circuit, a rectifier circuit, and a waveform correction circuit; the voltage divider circuit is electrically connected to the rectifier circuit, and the rectifier circuit is electrically connected to the waveform correction circuit; the deep integration primary and secondary FTU power harvesting circuit system for power distribution networks adopts a combined design of a voltage divider circuit and a waveform correction circuit. The waveform correction circuit ensures that the rectified voltage and current are in phase and the output voltage is stable, making the overall load on the secondary side of the transformer resistive, thereby improving power supply stability and reducing reactive power generation.

The invention provides an inversion compensation circuit, an inversion compensation method, a storage medium and computer equipment, which can perform reactive compensation on an inverter to reduce the reactive power of the inverter, thereby improving the efficiency of a power transmission system and reducing the electric energy loss of a power transmission line. Comprising a sampling module, a carrier generator and a control module, the sampling module is used for sampling data of an inverter, and the control module is used for processing the sampled data, finally determining a carrier, controlling the carrier generator to generate the carrier and outputting the carrier to the inverter.

The invention discloses a three-phase circuit step-down power factor correction digital control method, which belongs to the technical field of circuit control, and specifically comprises: after the three-phase alternating current is connected to a power supply, it is subjected to EMI filtering for interference suppression, and one path of the three-phase alternating current is input into a double-BUCK conversion circuit after passing through a rectifier bridge, and the double-BUCK conversion circuit comprises a power factor correction circuit and a DC / DC conversion circuit; after the three-phase alternating current is output from the double-BUCK conversion circuit, it is subjected to an output filtering circuit to reduce ripples, and then an input voltage sampling circuit is used to generate a voltage sampling signal, and the voltage sampling signal is input into a DSP control circuit to judge whether the input voltage is a voltage; when an input voltage abnormality signal is generated, the power factor correction circuit and the DC / DC conversion circuit are controlled to work at the same time; and a soft start circuit in the power supply is controlled to gradually increase the voltage on the high-voltage side capacitor to a preset voltage; the power factor correction circuit of the invention realizes the reduction of the reactive power loss of the circuit.

The present invention relates to the technical field of switching power supply control, and provides a switching power supply circuit based on harmonic compensation, including a rectifier module, a first filter module and a PWM half-bridge circuit connected in sequence, as well as a harmonic compensation module and a current detection module. The present invention adds a harmonic compensation module, and uses an energy storage capacitor EC1 or an energy storage capacitor EC2 to perform relay voltage compensation when a sinusoidal AC power is input, so that the diode in the rectifier bridge can be turned on during the time period from the instantaneous value of the AC input voltage (VEC3-2*n*VO) to the positive peak value, and during the time period from the positive peak value to the negative peak value, thereby widening the diode conduction angle in the rectifier bridge. Since the effective value of the input current will be reduced and the harmonic current will be suppressed, the reactive power will also be reduced and the power factor will be improved.

The utility model belongs to the field of inverters, and specifically provides an inverter topological structure and a photovoltaic inverter wherein the inverter topological structure comprises a DC interface, a six-switch single-phase bridge inverter circuit, an LCL filter circuit and an AC interface; the direct current input side of the six-switch single-phase bridge type inverter circuit is electrically connected with the direct current interface; and the inversion output side of the six-switch single-phase bridge type inversion circuit is electrically connected with the AC interface after being filtered by the filter circuit. The LCL filter circuit is arranged to filter the output voltage of the inverter topological structure, the attenuation characteristic of the filter in a high frequency band is effectively improved, meanwhile, the good gain characteristic of a low frequency band is kept, compared with an L-shaped filter, the equipment cost and size are remarkably reduced, the harmonic wave filtering effect is improved, the output voltage is closer to a pure sinusoidal waveform, and the harmonic wave filtering effect is improved. And the generated reactive power is lower, the power loss is smaller, the voltage stress between the switches is reduced, and the service life of the inverter topological structure is prolonged.

The present application relates to the technical field of wireless power transmission, and particularly relates to a coil arrangement design method and system of a multi-relay wireless power transmission structure, steps as follows: determining the transmission distance according to the voltage level; under the constraint of the transmission distance, introducing the arrangement ratio to represent the ratio of the second interval between adjacent groups in the non-equidistant grouping arrangement and the first interval between the coils in the same group, and establishing a geometric parameterized model of the non-equidistant arrangement; constructing the coupling impedance matrix based on the mutual inductance theory, and deducing the system energy transmission efficiency model; for different candidate values of the coil series, on the basis of the given coil parameters, the efficiency distribution curve of the system efficiency changing with the arrangement ratio is obtained by adjusting the arrangement ratio; based on the efficiency distribution curve, the optimal coil series and the corresponding optimal arrangement ratio that make the system energy transmission efficiency optimal are determined, and the optimal design scheme of the coil arrangement design is obtained. The present application can effectively improve the stability of system operation, the reliability of coil interface combination and the overall insulation stability.

The utility model relates to an energy-saving power supply for a light-load oil well, which comprises a voltage transformation assembly, a power distribution assembly and a lead assembly, the power distribution assembly and the lead assembly are electrically connected with the voltage transformation assembly, the lead assembly comprises a lead and a wire clamp connected to one end of the lead, and the wire clamp is of a U-shaped structure capable of being connected to a high-voltage cable of an oil well power grid. High-voltage alternating current of a power grid can be converted into 220V alternating current through the power supply, and power is supplied to equipment of an oil and gas well in a temporary shutdown state. Compared with an original transformer of an oil and gas well, the power supply is small in loss and reactive power, and consumption of electric power resources is reduced. In addition, the power supply and an original transformer of the oil and gas well can operate separately or parallelly, and repeated transportation, disassembly and assembly of the transformer are avoided.