60results about How to "No harmonic pollution" patented technology

This invention discloses a inversion method for photovoltaic parallel in network, which uses digital signal processor (DSP) as core, the power factor is one and having small harmonic pollution to electric network, said method is a high efficiency and high reliability inversion method.

The present invention refers to environmental protection type intelligent current-reducing and energy-saving control equipment method for street lamp. It contains single lamp controller circuit and street lamp circuit, wherein single lamp controller circuit module consisting of LCU control circuit module and multiple tapping power reducing ballast module, the output of said LCU control circuit respectively connected with one end of multiple tapping power reducing ballast, ac compensation capacitor module and street lamp circuit module through one end of multiple step control equipment of 220 ac power supply. Said invention has advantages of realizing single lamp independent timing or networking control, street lamp soft startups control, and street lamp relative constant power control etc, without harmonic contamination to electric power network, and prolonging street lamp service life.

A natural wind simulating fan comprises a single-chip microcomputer, a maximum wind-speed setting potentiometer, a wind speed fluctuation range setting potentiometer, a direct-current chopper control circuit, a magnetic saturation controllable electric reactor, a fan motor and a direct-current power source. The invention further discloses a natural wind simulating method which includes: initializing; reading maximum wind speed and wind speed fluctuation range setting values; randomly confirming preset time duration and target value of a wind speed control section and a wind speed changing mode of the section; and timing the wind speed control section, calculating a wind speed set value of the fan according to the confirmed wind speed changing mode, converting the wind speed set value of the fan into pulse-width modulation (PWM) pulse signals to output and the like. The natural wind simulating fan and method simulates the natural wind by using a magnetic saturation controllable electric reactor and common single-phase asynchronous motor series connection speed adjusting method, the natural wind can be simulated easily, harmonic pollution on a power grid cannot be caused, and the maximum wind speed and the wind speed fluctuation range of the natural wind can be set through the potentiometer.

The invention relates to an energy saving and large pulse power supply for crude oil electric dehydration and the production method thereof. The large pulse power supply comprises a low voltage dc power supply device outputting a low voltage dc power supply, a large power inversion device inverting the low voltage dc power supply and outputting a bipolar low voltage pulse power supply, a pulse transformer device improving voltage of the bipolar low voltage pulse power supply and outputting a high voltage dc power supply, a pulse switch device making the high voltage dc power supply be a high voltage and high frequency pulse power supply output to a load, a detection device and a control device. Firstly the bipolar low voltage pulse power supply is formed by the treatments of rectification, filter and inversion to the ac power supply, then the high voltage dc power supply is formed by treatments of voltage rise, rectification and filter to the pulse transformer, finally the high voltage and high frequency pulse power supply is formed by crossing the pulse switch with a complementary structure. The energy saving and large pulse power supply of the invention has advantages of frequency modulation, amplitude modulation, pulse width modulation, wide current range, non-harmonic pollution, energy conservation and small size or the like.

The invention relates to a power unit with brake function for a unit cascaded high-voltage frequency converter, which belongs to the technical field of power electronic equipment. The invention aims at providing the power unit of the cascaded high-voltage frequency converter, which has small feedback energy and can be used under the occasions which require rapid brake and startup. The adopted technical scheme is as follows: the power unit with the brake function for the unit cascaded high-voltage frequency converter comprises the power unit and a brake unit, the power unit comprises a short-circuit protection circuit, a bridge rectifier circuit, a direct current filter circuit, an inverter circuit and a controller of the power unit which are connected in sequence, wherein the short-circuit protection circuit is connected with the rectifier circuit, the rectifier circuit, the direct current filter circuit and the inverter circuit are connected in parallel, the inverter circuit is further connected with a control circuit of the power unit, the brake unit is connected in the power unit in parallel, and the brake unit consists of an energy consumption brake circuit and a brake controller, thereby being widely applied in various types of high-voltage frequency converters.

The invention provides a power supply topology system of an LED (Light-Emitting Diode) display module, comprising an AC (Alternating Current) power supply input interface, an AC power supply filtering and PFC (Power Factor Correction) module, a module auxiliary power supply module, a DC (Direct Current) bus, a plurality of main power supply conversion loop modules and a plurality of LED dot matrix display modules; the AC power supply input interface is connected with the AC power supply filtering and PFC module; the AC power supply filtering and PFC module is connected with the module auxiliary power supply module and the DC bus; the DC bus is connected to the module auxiliary power supply module and the main power supply conversion loop modules; and the main power supply conversion loop modules are connected with the LED dot matrix display modules.

The invention discloses a single-phase programmable current source device and a control method thereof. Voltage of a power grid sequentially passes through a circuit breaker, a three-phase input reactor and a three-phase alternating current contactor and then is accessed into a rectifying unit, the rectified voltage is accessed into a three-phase inverter assembly, a double-DSP (digital signal processor) control unit is used for receiving the current waveform parameters sent by a touch display screen or a remote monitoring platform, and adopts a continuous output method, the double-DSP control unit is also used for generating instruction current to drive three groups of inverter assemblies to generate current waveform, the inverter assemblies are used for outputting Hall detection signals and current transformer detection signals and feeding back into DSP controllers, and the input parameters of a current source generation unit are corrected. The single-phase programmable current source device has the advantages that the digital and intelligent functions are realized, and the single-phase programmable current source device is used for performing heat tolerance test on the devices, such as low-voltage switches, circuit breakers, alternating current contactors and fuses.

The invented automatic arc extinction device grounded in single phase utilized in power network of electric system is a control system composed of the circuit for measuring current of earth capacitance, arc suppression reactor, regulation control circuit, and driving protective circuit. The control system measures current value of earth capacitance from neutral point through grounding system with arc extinguishing coil regularly, and adjusts tap joint position of major arc winding automatically. When singlephase earth fault happens, combination states of secondary arc winding are adjusted and controlled automatically so as to compensate capacitance current. The invention possesses features of high response speed and precision, safe and reliable and less investment. The invented device is applicable to 3-66kV grounding system from neutral point through arc winding.

The present invention discloses a plug-and-play adjustable impedance device. The device comprises a mutual inductor, an inverter and a modulation signal generation module. Primary side winding of the mutual inductor is a transmission line passing through an iron core between power supply and a load, the number of windings of the primary side winding is one, the iron core of the mutual inductor is a long and thin and cylindric or is suitable for long and thin cuboid of a busbar; the modulation signal generation module is configured to generate modulation signals of the inverter, the modulation signals are generated through superposition of first reference signals and second reference signals, the first reference signals are obtained through first multiple amplification of fundamental wave signals, and the second reference signals are obtained through second multiple amplification of fundamental wave signals after 90-degree phase shift; and the inverter is configured to convert direct current signals to alternating current voltage signals having the same frequency with the modulation signals and load the alternating current voltage signals to two ends of the secondary side winding of the mutual inductor to regulate the amplitude and phase of the primary side fundamental wave equivalent impedance of the mutual inductor through the first multiple and the second multiple. The plug-and-play adjustable impedance device can realize continuous stepless adjustable impedance.

The invention relates to a ship shore power system respectively connected with a ship and a power grid. The ship shore power system comprises a distribution portion connected with the power grid and used for receiving the voltage of the power grid from the power grid and performing reactive power compensation and harmonic management of the power grid; and a transformation portion connected with the distribution portion and used for receiving the voltage of the power grid from the distribution portion and performing transformation and / or frequency conversion of the voltage of the power grid, and when the transformation portion is connected with the ship, the transformation portion supplies the conversion voltage after transformation and / or frequency conversion to the ship. No matter the frequency of a power supply system of the docking ship is 50 Hz or not 50 Hz, the ship shore power system can be connected with the power supply system of the ship, and the power consumption of the ship is satisfied. Besides, the ship shore power system can also perform reactive power compensation and harmonic management of the power grid so that an electric power system of the power grid does not generate harmonic pollution.

The invention relates to a voltage stabilizing device without harmonic pollution or instantaneous output voltage sag and a voltage stabilizing method. The device is formed by connecting switches K1-Kn, an inductor L1, a switch K1' and a primary side multi-tap transformer T1. Because the inductor L1 and the switch K1' are used in the device, the output voltage can still be stably output in the switching process in a specified system switching time sequence, instantaneous sag is not produced, and the device and the method meet the requirements of certain equipment sensitive to instantaneous voltage sag, particularly the occasions of high power.

The invention discloses a switched reluctance motor dual-PWM power converter comprising an IGBT rectifier, a rectifier control unit, an inverter, and an inverter control unit. The input end of the IGBT rectifier is externally connected with AC power. The output end of the IGBT rectifier is connected with the input end of the inverter. The output end of the inverter is externally connected with a switched reluctance motor winding. The rectifier control unit outputs a control pulse to the IGBT rectifier by use of a voltage-oriented vector control strategy. The inverter control unit outputs a control pulse to the inverter by use of a current chopping control strategy. According to the invention, the voltage-oriented vector control strategy is used at the rectifier side, the current chopping control strategy is used at the inverter side, the rectifier and the inverter constitute a dual-PWM switched reluctance motor power converter, two-way power flow is realized, and no harmonic pollution is caused to the grid. Therefore, the switched reluctance motor dual-PWM power converter is a green, environment-friendly and efficient power electronic device in the real sense.

The invention discloses an intelligent large-torque starting method of a wound-type motor. According to the method, multiple stages of loop resistance systems are connected in series on a rotor of the wound-type motor , and the rotating speed of the motor is controlled according to the number of accessed loop resistors; a speed test device is arranged on the rotor of the wound-type motor and conducts real-time measurement on the rotating speed of the motor; the speed test device and the multiple stages of loop resistance systems are connected with a single-chip microcomputer system respectively, and the single-chip microcomputer system controls the number of the accessed loop resistors after processing the real-time rotating speed information of the motor. The intelligent large-torque starting method of the wound-type motor has the advantages that the resistance accessing to the motor system is controlled intelligently in the starting process through speed measurement of the single-chip microcomputer.

The invention discloses an electromagnetic-coupling excitation speed regulator. The speed regulator is connected between a motor and a load, and comprises an outer rotator, an inner rotator and excitation windings. The inner surface of the outer rotor is uniformly provided with a plurality of conducting bar grooves in the axial direction, a squirrel cage conducting bar is arranged in the conducting bar groove, and a closed loop is formed by the squirrel cage conducting bars through end rings. The outer surface of the inner rotator is provided with a plurality of winding grooves, and the excitation windings are arranged in the winding grooves between magnetic poles. When the excitation windings are energized, the outer surface of the inner rotator generates a plurality of pairs of magnetic poles with N and S alternation, while the outer rotator and the inner rotator rotate together after electromagnetic coupling, and the excitation current is changed, thereby regulating the speed. The invention reduces the excitation consumption, enhances the transmission efficiency, is simple in structure and assembly, has no harmonic pollution on networks, prolongs the service life, and decreases the cost.

The invention relates to a high-voltage soft-starting, voltage-stabilizing and voltage-regulating device of a compensating transformer, comprising a tapped transformer and a high-voltage compensating transformer, wherein a secondary electrode of the high-voltage compensating transformer is connected in a high-voltage line in series; the high-voltage line is connected with a high-voltage motor; the tapped transformer comprises 2K taps, wherein K taps are respectively connected with an input end of a primary electrode of the high-voltage compensating transformer, by a second bidirectional silicon-controlled thyristor, and the other K taps are respectively connected with an output end of the primary electrode of the high-voltage compensating transformer by a first bidirectional silicon-controlled thyristor; K is an positive integer greater or equal to 2; and the input voltage of the tapped transformer is 220V. The high-voltage soft-starting, voltage-stabilizing and voltage-regulating device of the compensating transformer is used for replacing the existing high-voltage starting device, realizes high-voltage soft starting of the high-power high-voltage motor and has no harmonic pollution.

The invention provides a lead-acid battery internal formation charging and discharging power supply, which comprises a lead-acid battery, a first electrolytic capacitor, a second electrolytic capacitor, an inductor, a first IGBT (Insulated Gate Bipolar Transistor) and a second IGBT, wherein a positive electrode of the lead-acid battery is connected to an emitting electrode of the first IGBT and an emitting electrode of the second IGBT through the inductor. The lead-acid battery internal formation charging and discharging power supply adopts an IGBT module and a control and regulation circuit thereof to form high-frequency PWM direct current chopping with the frequency being controllable in a range from 5HZ to 1KHZ, thereby not only being capable of realizing an internal formation operating mode of positive and negative pulse charging, but also being capable of realizing an internal formation operating mode of constant-current charging and constant-current discharging, and being simple in circuit structure; polarization of the battery can be removed effectively, the consumption of electric energy is reduced, more than 40% of energy can be saved, the working time is saved, temperature rise of the battery can also be reduced, acid gas evolution is reduced, and pollutions for the atmospheric environment are reduced; and the capacity of the battery can be improved, and no harmonic pollution is imposed on the power grid.

The invention provides a preheating ignition method and device for an electric melting furnace. The preheating ignition method and device are used for producing rock wool by using red mud. A large-power nickel-chromium resistance wire is additionally introduced to a point discharge point of a three-phase graphite electrode for preheating and serving as an ignition device to dry the interior of a novel electric melting furnace, preheat furnace materials and realize stable transition after electric arc ignition through the three-phase electrode. The electric melting furnace is high in electric arc ignition speed, steady one-time arc ignition can be achieved, the three-phase current is balanced, and automatic or manual control can be realized. The voltage and the current do not fluctuate severely. Unstable electric arc burning does not exist. Short circuit and arc breaking are avoided. The preheating ignition method and device have no impact on a power grid and are free of harmonic pollution in the implementation process.

The present invention discloses a soft starting method of a high voltage motor and a device thereof. According to the invention, an inductor with adjustable magnetic resistance is provided at each phase of electric power source at two ends of the operation power switch of the high voltage motor. The adjustment to the magnetic resistance of the inductor is realized by the relative movement between the inductor coil and the magnetic core of the inductor. The method of the invention has the advantages of small and smooth starting current, no harmonic pollution, no injuring effect to the electric motor, low cost, energy saving and strong overload capacity. The method is mainly used for the soft starting and soft stopping of the high voltage motor.

The invention belongs to the technical field of squirrel-cage type asynchronous motor stator winding design, and in particular relates to a 6 / 8 / 12-pole single-winding three-speed asynchronous motor stator winding mode. According to the stator of the motor, only a set of winding is adopted, and by adjusting the tap of the winding and changing the linking mode of the winding, three structural modes of 6 / 8 / 12 poles can be achieved in one winding arrangement mode, three different rotation speeds can be achieved, and the purpose of energy conservation is achieved. By adopting the stator winding mode provided by the invention, annular flow consumption caused by mutual influence of different windings of a double-winding multi-speed motor can be eliminated while the practical operation requirements of an oil field are met, and meanwhile compared with frequency variation speed adjustment, the mode prevents a power grid from harmonic pollution, and improves the electric energy quality and the operation reliability of the power grid.

The invention discloses a six-in-one machine stable photovoltaic power generation system, which comprises a solar energy absorption assembly for realizing a photoelectric conversion effect, an electric water heating boiler, a first circulating water pipeline, a hot water storage tank, a second circulating water pipeline, a heat exchanger, a six-in-one machine, a cold water storage tank and a third circulating water pipeline, wherein the solar energy absorption assembly is electrically connected with the electric water heating boiler, one end of the first circulating water pipeline is communicated with the electric water heating boiler, the other end of the first circulating water pipeline is communicated with the water inlet end of the hot water storage tank, one end of the second circulating water pipeline is communicated with the water outlet end of the hot water storage tank, the other end of the second circulating water pipeline is communicated with the heat exchanger, and the six-in-one machine is electrically connected with the heat exchanger and external electrical equipment. The photovoltaic system can solve the problem that photovoltaic power generation and harmonic waves cannot be stable.

The invention discloses an electromagnetic coupling excitation speed governor which is connected between an electric motor and a load and comprises an outer shell, an outer rotator, an inner rotator and an excitation winding. The outer rotator is a magnetizer in a whole cylindrical structure, one end of the outer rotator is connected with an output shaft of the electric motor, and a conductor for generating an induction current is arranged on the inner surface of the outer rotator. When the excitation winding is energized, a plurality of pairs of magnetic poles between an N phase and an S phase are generated on the outer surface of the inner rotator which rotates together with the conductor of the outer rotator through electromagnetic coupling, and the aim of controlling speed is achieved by changing an excitation current. The speed governor can lessen the excitation loss, improve the transmission efficiency, has simple structure and assembly without harmonic pollution to a power grid, not only prolongs the service life, but also decreases the cost.

The invention relates to an active power grid feedback type battery discharging apparatus comprising a low-pass filtering channel formed by a control circuit, an inductor and a capacitor. An IGBT module forms an H bridge inversion device. An inductor and a transformer form an isolated output device. The low-pass filtering channel is connected with the H bridge inversion device that is connected with the isolated output device. A storage battery carries out filtering by the low-pass filtering channel; the H bridge inversion device is controlled by the control circuit, so that the storage battery current after filtering becomes a sinusoidal wave; and then the current is filtered by the inductor and the transformer and are outputted in an isolated mode; and the current is fed back to the power grid. The apparatus has the following advantages: the high-frequency PWM rectification technology is used and the battery energy is fed back to the power grid; no heat is caused; and security and reliability are high. The discharging process is controlled automatically and the unattended operation is realized. The current injected into the power grid is a sinusoidal wave and the no harmonic pollution on the power grid is caused by the apparatus.

The invention discloses a dual-PWM variable frequency power supply feedback energy processing device and method, wherein the device comprises a signal collection circuit and a braking unit, and the signal collection circuit is electrically connected with a connection point of two serially connected DC bus capacitors; the braking unit comprises a braking resistor, and the braking unit is connectedin parallel with the two serially connected DC bus capacitors; the braking unit and / or the signal collection circuit is electrically connected with a controller respectively. During the operation, thesignal collection circuit collects a DC bus voltage in real time and transmits the DC bus voltage to the controller, the controller compares the DC bus voltage with a preset threshold Ua and / or a preset threshold Ub, and controls a PWM rectifier to switch between a rectifying state and an active insertion state or stop working, or / and controls braking current to flow by the braking resistor or not according to the comparison result, thereby realizing the two-way flow of the energy between a power grid side and a load side and avoiding faults caused by the feedback energy, the operation is safe and reliable, and the cost is low.

The invention relates to a high-voltage alternating-current-motor multistage-reactance adjustable voltage-reduction soft start device. The device comprises a power grid transformer substation voltage transformer PT, a power grid transformer substation distribution loop current transformer CT, a power grid transformer substation distribution loop vacuum circuit breaker QF1, a soft starter starting vacuum circuit breaker QF2, a bypass vacuum circuit breaker QF3, a vacuum contactors KM1, KM2 and KM3, a multitapped high voltage reactor L, a soft starter internal voltage transformer VT and an intelligent controller PLC. In the invention, through collecting and detecting a three-phase power grid voltage, a motor current and other parameters, a multistage reactor is driven to carry out impedance adjustment control and high-voltage electric voltage-reduction soft start is realized. The device possesses advantages that start performance is good; reliability is high; there is no harmonic pollution; stability is high; a service life is long; and maintenance and repairing are convenient and so on.

This invention relates to whole circuit temperature constant heating device, which comprises heating load, heating element and control device, wherein, control device comprises power circuit, synchronous trace circuit, compare circuit, output circuit and sample circuit composed of conductive parts, resistance and heating parts; execution elements controllable cathode one path is connected to the heating element and with other connected to output circuit.

The invention provides an intelligent control system for an electromagnetic precise control type electricity-saving device. An air switch, three current sensors and a pulse width controller are installed on the upper part of a computer case of the electromagnetic precise control type electricity-saving device; a central processing unit (CPU), three current amplifiers, a current comparison amplifier, a current digital amplifier, a timer, a temperature controller, a power amplifier and a low-voltage power supply and a sinusoidal wave former are installed on the middle part of the computer case; the three parallelly-connected current sensors are connected with the CPU through the three parallelly-connected current amplifiers and then through the current comparison amplifier; the three parallelly-connected current sensors are connected with the CPU through the three parallelly-connected current amplifiers and then through the current digital amplifier; and an intelligent control system for the energy-saving control loop can be formed. The system provided by the invention utilizes the magnetic force and the pulse width to continuously precise regulate and control the output power mode of the power supply, so that the power-supply power of the power source and the actually consumed power of the load can be matched precisely and the loaded power supply of the load can be realized; the system also can automatically clear away the harmonic waves and surges in a power supply system so as to provide a high-quality power supply for power equipment; the system also can carry out multiple compensation on the line, improve the power factor, reduce the line loss, increase the line capacity, improve the power efficiency of the system and can obtain double significant beneficial effects of saving electric energy and abating harmonic wave pollution in a power supply network.

The invention provides a preheating ignition method and device for an electric melting furnace. The preheating ignition method and device are used for producing rock wool by using red mud. A large-power nickel-chromium resistance wire is additionally introduced to a point discharge point of a three-phase graphite electrode for preheating and serving as an ignition device to dry the interior of a novel electric melting furnace, preheat furnace materials and realize stable transition after electric arc ignition through the three-phase electrode. The electric melting furnace is high in electric arc ignition speed, steady one-time arc ignition can be achieved, the three-phase current is balanced, and automatic or manual control can be realized. The voltage and the current do not fluctuate severely. Unstable electric arc burning does not exist. Short circuit and arc breaking are avoided. The preheating ignition method and device have no impact on a power grid and are free of harmonic pollution in the implementation process.

The invention discloses a direct electricity-to-heat type efficient energy storage and release system which comprises an IGBT power module, the IGBT power module is connected with an electricity-to-heat storage module through a cable, the electricity-to-heat storage module is connected with a fluidized heat exchange module through a pipeline, and the fluidized heat exchange module is connected with a solid heat storage material intermediate tank through a pipeline. The solid heat storage material intermediate tank is further connected with the electricity-to-heat heat storage module through a pipeline, and the fluidization heat exchange module is connected with a power generation or heating module through a hot air circulation module and forms a circulation loop with the power generation or heating module. According to the direct electricity-to-heat type efficient energy storage and release system, the problems that in the prior art, electricity-to-heat energy storage cannot be directly connected with a middle-high voltage power grid, and the energy storage and release rate is low are solved.