33results about How to "Adjust voltage" patented technology

The invention relates to a natural converting type hybrid high-voltage DC circuit breaker, and belongs to the field of DC circuit breakers applied to DC transmission distribution networks. The circuit breaker is formed by connecting a plurality of completely the same high-voltage DC circuit breaker modules in series though a disconnecting switch; each high-voltage DC circuit breaker module is on the basis of the natural converting type hybrid DC circuit breaker; each circuit breaker module comprises a main current branch, a main circuit breaker branch, an overvoltage protecting and energy absorbing branch and a measuring control system; the three branches are interconnected in parallel and are respectively connected with the measuring system; the measuring system controls the working time sequences of the three branches. According to the circuit breaker, active devices such as charging capacitor for assisting zero crossing are saved; the control is simple, the reliability is high, and the demand of domestic DC transmission network and DC distribution network on the DC circuit breaker can be met.

The invention provides an electric power generating system and a control method thereof, and the system and method provided by the invention are used for solving the defect that the existing electric power generating system which centers on a synchronous motor has less possibility of maintaining constant frequency output when a prime motor operates in a speed change mode. According to the invention, the frequency of an alternating current excitation power supply which is output by a first frequency conversion device is controlled to be always equal to the slip frequency of a first motor according to the preset frequency of three-phase alternating current which is output according to the rotation speed of a first motor rotor and a first motor stator winding so as to adapt to the variations of the rotation speed of the first motor, thus the variations of the rotation speed of the first motor are matched with the optimal rotation speed of the prime motor, the speed change constant frequency output of the electric power generating system is realized, simultaneously the efficiency of the electric power generating system is improved, and the static state and transient state stability of the electric power generating system are improved obviously.

The invention discloses an ultrashort pulse laser induced plasma assisted electric spark compound processing device and an ultrashort pulse laser induced plasma assisted electric spark compound processing method under action of a magnetic field and belongs to the field of laser processing and electric spark compound processing of special processing. The device compounds a laser induced plasma processing unit, an electric spark processing unit and a compound magnetic field unit together organically. The laser induced plasma processing unit comprises an ultrashort pulse laser, a laser power supply, a water cooler and a light path conversion assembly. The compound magnetic field comprises a direct current excitation power supply and an annular electromagnet. The electric spark processing unitcomprises a five-degree-of-freedom precision platform for controlling a workpiece to move expectedly. The device and the method provided by the invention sole the problem that it is hard to process alow conductivity material and achieve cross-dimension processing and the processed surface is not enough high in quality in the electric spark processing technology, and have a very wide applicationprospect.

The invention discloses a driving circuit and method of a permanent magnet synchronous motor (PMSM). The method comprises steps of: estimating the counter-electromotive force information of a certain phase of a PMSM by sampling the voltage information and the current information of the phase; and computing an angle difference between a first voltage signal representing the counter-electromotive force information and a current sampling signal representing the current information in order to obtain an angle difference signal, wherein the angle difference signal is used for adjusting the amplitude of a first horseshoe-shaped modulating wave in order to control the current phase of a rotor to be consistent with the phase of the first horseshoe-shaped modulating wave and further achieve maximum torque per ampere. The method obtains the counter-electromotive force information by estimation, does not require complex coordinate transformation, and is simple in algorithm and easy to implement. In addition, the method changes a phase difference between the counter-electromotive force of the motor and the phase current by adjusting the current of the motor, thereby achieving maximum torque control and high motor efficiency.

The invention discloses a detecting device of a liquid crystal display and a method thereof, belonging to the field of detection technology. The detecting device executes a plurality of detection stages for the liquid crystal display in sequence according to detection parameters set by users. Each detection stage sequentially comprises the following steps of: turning on and turning off a power supply many times, and detecting whether the display picture of the liquid crystal display and the control function are normal or not. Each round of turning on and turning off the power supply includes a step of turning on the power supply once to provide power for the liquid crystal display and a step of turning off the power supply once to stop providing power to the liquid crystal display. The frequency and time for turning on and turning off the power supply in each detection stage are the same, while the duty ratios of turning on and turning off the power supply are different. When the display picture of the liquid crystal display or the control function is abnormal, the liquid crystal display does not pass the detection. When all the detection stages are executed and the display picture of the liquid crystal display or the control function is normal, the liquid crystal display passes the detection.

The invention relates to a pavement construction method which comprises the following steps: (1) paying off and leveling; (2) arranging a base layer and flattening the base layer; (3) arranging a heat insulating layer on the base layer; (4) laying electrical heating material on the heat insulating layer; (5) paving a concrete bottom layer on the heat insulating layer; (6) spraying an epoxy asphalt waterproof adhesive layer on the concrete bottom layer; and (7) paving a concrete top layer on the waterproof adhesive layer.

The invention discloses a method for constructing road surfaces.The method includes steps of (1), carrying out paying off and leveling; (2), arranging basement layers and leveling the basement layers; (3), arranging heat-insulation layers on the basement layers; (4), laying electric heating materials on the heat-insulation layers; (5), paving concrete bottom layers on the heat-insulation layers; (6), spraying epoxy asphalt waterproof bonding layers on the concrete bottom layers; (7), paving concrete top layers on the waterproof bonding layers.The electric heating materials are numbered when laid and are divided into first arrays and second arrays; the heights of the electric heating materials of the second arrays are lower than those of the electric heating materials of the first arrays when the electric heating materials are laid.

The invention relates to a low-voltage management system of a power distribution network and belongs to the technical field of electricity power distribution. The low-voltage management system of the power distribution network comprises a voltage signal detection module, a voltage comparison module, a control chip, a motor, a tapping switch, and a three-phase self-coupling transformer. The voltage signal detection module is used for voltage sampling, the sampling voltage is transferred to the voltage comparison module for voltage comparison and then processed by the control chip for actuation time setting calculation, the voltage is then used for the motor, the motor obtains electricity and acts, enabling the tapping switch to move and the number of turns of winding at the low-voltage side of the three-phase self-coupling transformer to change, and the function of automatic voltage regulation is achieved. The low-voltage management system of the power distribution network is capable of automatically regulating voltage change, outputting stable voltage, and enabling circuits to be stable. At the nominal voltage hovering around 20%, voltage regulation can be effectively conducted, and it is guaranteed that voltage output at the power supply line end of a rural power grid is within the specified range.

The invention discloses a system for dynamically regulating the quality of partial power grids for household energy storage systems. The system comprises an energy management system, a grid-connected inverter and a wireless power grid dispatching device. Real-time power grid quality information of power grid companies can be wirelessly acquired by the wireless power grid dispatching device, the acquired power grid quality information can be transmitted to the energy management system, analysis and computation can be carried out by the energy management system according to the fed power grid quality information combined with preset standard thresholds, power grid frequency and voltage fluctuation range values can be obtained, active electric energy or reactive electric energy can be outputted by the grid-connected inverter to power grids to be regulated, and the grid-connected inverter is used as an execution unit.

The invention discloses a DC motor driving circuit. The DC motor driving circuit comprises a single chip microcomputer, an NPN transistor Q1, a PNP transistor Q2, a first current limiting resistor R1,a first voltage dividing resistor R2, a second voltage dividing resistor R3, a first variable resistor R4, a second variable resistor R5, a second current limiting resistor R6 and a capacitor C1. Thesingle chip microcomputer controls on-off of a DC motor control port through an IO port, wherein the resistance values between the first variable resistor R4 and the second variable resistor R5 are employed for adaptive regulation to achieve regulation of the voltage of the DC motor control port so as to achieve the 0-15V control voltage range and facilitate adapt to different types of DC motors,and therefore, the application surface is wider.

The invention discloses a 35 kV direct-hanging SVG system and a PLC logic control method thereof. The control system uses a method of configuration monitoring + PLC+ controller. The configuration monitoring is mainly responsible for issuing various control parameters, whole machine protection set values, and displaying operation states and faults. The PLC is mainly responsible for whole machine operation flow. The main controller uses DSP adding FPGA architecture. The 35 kV direct-hanging SVG does not need a step-down transformer, and is directly hung on a 35 kV power grid. The system can adapt to hundred-trillion-level fast dynamic compensation of a power grid, adjusts voltage of a long-distance transmission line, reduces power transmission loss, improves transmission capacity, and improves transient voltage maintenance level. The system can be widely used in wind power stations, photovoltaic power stations, etc.

The invention discloses a sliding torque-changing motor, comprising a motor casing and a motor rotating shaft passing through the motor casing. The motor casing is internally provided with a pole coilfixedly connected thereto, and the motor rotating shaft is sleeved and fixed with a pole rotor coaxial with the pole coil. The pole rotor includes a first magnetic conductive ring segment, a non-magnetic conductive segment and a second magnetic conductive ring segment located outside the pole coil and axially connected and distributed, a plurality of first bumps and second bumps extend outwards in the axial and radial direction along the outer periphery of the first magnetic conductive ring segment and the second magnetic conductive ring segment, and a rotor and a stator winding are coaxiallyarranged outside the pole rotor. A first adjustable flux magnetic steel and a second adjustable flux magnetic steel are fixed on the inner wall of the rotor, a rotor magnetic steel is also provided on the rotor, and the stator winding is fixedly connected with the motor casing. The sliding torque-changing motor can be used as a motor, and can also be used as a generator. When used as an engine, the output rotating speed and the torque are adjustable. When used as a generator, the current, voltage and frequency of the output electrical signal are adjustable, and the adjustment is simple and the application range is wide.

The invention relates to a double-layer electric vehicle quick charging electric price correction method for voltage control of distribution network, which is characterized in that the method comprises the following steps: 1, utilizing electric vehicle mobility simulation model to predict electric vehicle quick charging demand, namely travel information requiring quick charging; 2, utilizing electric vehicle mobility simulation model to predict electric vehicle quick charging demand. 2, according to the travel information required for quick charging obtained in the step 1 and the quick charging price scheme determined by the upper optimization model, determining the user needing quick charging and selecting the quick charging station, and further determining the charging load of the quickcharging station; 3, construct an upper optimization model; according to the fast charging demand of electric vehicle and the fast charging station load determined by the lower level model, the modeloptimizes the fast charging station price scheme with the objective of minimizing the total voltage amplitude deviation. By optimizing the fast charging price, the invention guides the fast charging load redistribution, so that the total offset of the distribution network is minimized and the income of the fast charging station is ensured to remain unchanged.

The invention discloses a silicon controlled rectifier power modulator. The silicon controlled rectifier power modulator comprises three-phase electrical interfaces A, B and C, and power and voltage regulating interfaces A1, B1 and C1, wherein the A and the B are connected with an input end of a power and voltage regulator F1, and the A1 is connected with an output end of the power and voltage regulator F1; the A and the C are connected with an input end of a power and voltage regulator F2, and the B1 is connected with an output end of the power and voltage regulator F2; the B and the C are connected with an input end of a power and voltage regulator F3, and the C1 is connected with an output end of the power and voltage regulator F3; the F1, the F2 and the F3 are of the same structure; two input ends of an IC3 are connected with a VIN1 and a VIN2, an output end of the IC3 is connected with a positive power supply interface of an IC1, another output end of the IC3 is connected with one end of an R1, and the other end of the R1 is connected with an inverting input end of the IC1. According to the silicon controlled rectifier power modulator, the F1, the F2 and the F3 form the new three-phase output ends A1, B1 and C1, thus voltage and power between any two of the A1, the B1 and the C1 can be adjusted easily, and the silicon controlled rectifier power modulator can be applied to generator excitation system.

The invention discloses a color-temperature-adjustable light source module, which comprises a substrate, a first color temperature light source group, a second color temperature light source group anda third color temperature light source group. The first color temperature light source group, the second color temperature light source group and the third color temperature light source group are packaged on the substrate. The color coordinates of the first color temperature light source group, the second color temperature light source group and the third color temperature light source group aredifferent. The first color temperature light source group and the second color temperature light source group are connected in parallel. The first color temperature light source set comprises a firstcolor temperature light source module and a first resistor module which are connected in series. The voltage of the first color temperature light source module is smaller than that of the second color temperature light source group. According to the invention, the color temperature change track of a light source formed by the plurality of color temperature light source groups can be overlapped with the track of a black body according to the magnitude of the current to form a white light effect.