126results about How to "Improve output waveform quality" patented technology

The invention discloses a parallel active filter based on a modularization multi-level converter and a control method of the parallel active filter and belongs to the technical field of power harmonic suppression in a medium-high voltage high-power occasion. The problem that an existing parallel active filter cannot carry out harmonic combination compensation effectively, so that power distribution network electric energy quality is poor is solved. The filter comprises the modularization multi-level converter, a current transformation unit, a harmonic current detecting unit, a current controller, a capacitor C and a power grid electric reactor LS. The modularization multi-level converter is of a half-bridge-type topological structure, and an upper bridge arm and a lower bridge arm of the modularization multi-level converter respectively comprise n submodules SMn. According to the control method, a carrier phase-shifting modulation method is used, so that under the same switch frequency, equivalent switch frequency is high, switching loss is reduced, meanwhile, a capacitive coupling voltage sharing and ring current suppression strategy is used, and capacitor voltages and direct current bus voltages of the submodules are kept stable. The parallel active filter is used for harmonic suppression of a power grid.

The invention discloses a series hybrid bipolar direct-current transmission system with direct-current fault ride-through capability. The series hybrid bipolar direct-current transmission system comprises a rectifier station and an inverter station, wherein the rectifier station is connected with the inverter station through a direct-current transmission line; positive electrodes and negative electrodes of the rectifier station and the inverter station are formed by connecting thyristor converters and modular converters in series; and each modular converter is formed by connecting one or more modular multilevel converters in parallel. The series hybrid bipolar direct-current transmission system has the advantages of low construction cost, low loss, high reliability and the like of the traditional thyristor converters, and has the advantages of flexible control, low harmonic wave, active and reactive power decoupling control, voltage support capacity on an alternating-current system access point and the like of the modular multilevel converters; the system is divided into the positive electrode and the negative electrode; the operation reliability is enhanced; and a direct-current fault can be removed by the actions of the converters under various faults. Therefore, the series hybrid bipolar direct-current transmission system is suitable for high-voltage direct-current transmission occasions of a remote high-capacity overhead line, has a wide development space and is worthy of strong popularization.

The present invention discloses a non-isolated AC-AC three-level AC-AC converter which has a structure comprising an input filter, a multilevel converter and an output filter connected in turn. Wherein the multilevel converter is composed of a basic constitution unit of two capacitors clamping, an energy-storage inductor and an energy-storage capicitor which are constitued for converting the input voltage to three output levels; the basic constitution unit is composed of a four quadrants power switch and a clamping capicitor. By different combinations with the input filter, basic constitution unit and output filter, a circuit topology family for non-isolated AC-AC three-level AC-AC converter including Boost type, Buck-Boost type, Cuk type, Sepic type and Zeta type. The invention with improved converting effiency, power density, reduced volume and weight as well as input side power factor is fit for high voltage AC-AC electric power converting, due to the reduced volume and weight of the output filter and improved output waveform quality, the application fields of three-level AC-AC converter can be widened.

The invention discloses a dual-capacitor module based MMC type multi-port power electronic transformer. The transformer comprises a modular multilevel converter (MMC), a DC / DC converter and an inverter, wherein the MMC has two sub modules; the DC / DC converter comprises a primary part, a high frequency voltage transformation part and a secondary part, wherein the primary part has four kinds of selective topologies. The transformer can be operated on the high voltage direct current side at a low voltage; the transformer has fault ride-through capability, and relatively less devices are used; the module in the MMC and the DC / DC converter are responsible for direct current voltage control and power control respectively; a single capacitor voltage of the module can be controlled independently, or two capacitor voltages of the module can be controlled simultaneously; the transformer is equipped with the four ports, including a high voltage direct current port, a high voltage alternating current port, a low voltage direct current port and a low voltage alternating current port, so that the transformer is suitable for multi-kind high-voltage high-power occasions of multiple voltage levels, and particularly suitable for the energy internet; for example, the transformer can be used as an energy router, and the like.

This invention discloses an AC-AC three-level converter based on normal converter, in which, the circuit of the converter is composed of an input high voltage AC supply, an input filter, a multi-level converter, a HF transformer, a cycle converter, an output filter and output AC load, in which, the multi-level converter is composed of one or many basic units to convert the input voltage to multiple output levels, said basic unit is made up of two four quadrant power switches and one four-quadrant clamp power switch and the circuit topology group based on the AC-AC three-level converter of a normal converter includes normal, push-and-pull, semi-bridge and full bridge topologies, which reduces voltage stress of power switch, series of power conversion and increases power factors of input side, conversion efficiency and power density.

The invention relates to a mobile emergency power supply based on a system converter in the technical field of power supplies, which comprises a battery module, the multi-functional converter, a direct current reactor, three alternating current reactors, two direct current voltage-stabilizing capacitors, eight contactors and a main control circuit module. A DSP2812 digital signal processor is used as a core controller, a touch screen is adopted as a system upper computer, the running state of a system is selected, a running command signal of the system is given out, and the operation is simple. The core part of the power supply is the multi-functional converter, and the system can work in one state of direct current conversion, PWM rectification and PWM inversion by leading the contactorsto close different loops. Electrical energy can be derived from four inputs of wind energy, solar energy, commercial power and a diesel engine, thereby effectively improving the reliability of the system.

The invention discloses a parallel circulating-current restraining and neutral-point balancing method of a T-type three-level photovoltaic grid-connected inverter. The method for achieving a neutral-point balance comprises the following steps: step one, converting three levels into a two-level SVPWM, figuring out a status switching time for each phase bridge arm on the basis of the SVPWM; and step two, adjusting the status switching time for each phase bridge arm, thereby acquiring a final PWM signal. After achieved the neutral-point balance, a corrected value of a small vector is figured out based on a PI controller; accordingly, a circulating-current restraint is achieved by changing a turn-on time of the small vector. The adopted neutral-point balancing method is able to deal with fluctuations of capacitors on a direct current side, and is able to improve the quality of output waveforms by a certain degree. The parallel circulating-current restraining and neutral-point balancing method of the T-type three-level photovoltaic grid-connected inverter is able to simply and conveniently achieve the restraint of the circulating current, and is simple in control. The parallel circulating-current restraining and neutral-point balancing method of the T-type three-level photovoltaic grid-connected inverter is able to achieve a neutral-point balance control and the circulating-current restraint, thereby solving the difficulty in connecting T-type inverters in parallel. Comparing to a conventional method of dealing with the circulating current by hardware, the parallel circulating-current restraining and neutral-point balancing method of the T-type three-level photovoltaic grid-connected inverter is lower in cost.

The present invention provides a modular parallel three-level Vienna rectifier, a control system and a method. The present disclosure effectively suppresses the zero-sequence circulation of a system,and the waveform quality of the input current is improved remarkably, so the invention is suitable for the working conditions that the current distribution proportions of two three-level Vienna rectifier modules are equal and unequal and the input filter inductances are equal and unequal. The elimination of the zero-point distortion of the input current fully considers the influence of the filterinductor on the relative position of the voltage vector and the current vector. The effect of the input current zero-crossing distortion is better than that in a conventional method, and the total harmonic distortion rate of the input current is reduced.

The present invention discloses a seven-level inverter, consisting of a direct current power supply, two switch capacitor banks and a full-bridge switch group, wherein each switch capacitor bank is composed of a switch capacitor, two power switch tubes and three uncontrollable diodes; and the full-bridge switch group is provided with a traditional full-bridge structure. The seven-level inverter disclosed by the invention has ten main switch states, can be used for outputting seven voltage levels namely 3E, 2E, E, 0, -E, -2E and -3E, is only provided with one direct current power supply, and can be used for boosting the input direct current power supply without using a transformer; and compared with a seven-level inverter with a traditional structure, the complexity of devices can be greatly reduced, the manufacturing cost can be effectively reduced, and the inverting efficiency can also be improved.

The invention discloses a carrier offset-based control method for the mid-point voltage balance of a multilevel inverter. The method comprises the following steps: detecting a capacitance transient voltage between the midpoint and the anode and a capacitance transient voltage between the midpoint and the cathode of a direct-current bus of the multilevel inverter by a sampling unit of a digital processing control module, and determining the bias of the two capacitance transient voltages; regulating the carrier offset of the current moment through a carrier offset control regulating unit; outputting a control regulating signal of the carrier offset control regulating unit to an SVPWM (space vector pulse width modulation) vector control unit; outputting a PWM signal through a drive circuit to control the working condition of the multilevel inverter, and meanwhile, controlling the mid-point voltage balance of a multilevel inverter. According to the carrier offset-based control method disclosed by the invention, on the basis that an original SVPWM control method is kept, the mid-point voltage balance is controlled only by changing the carrier offset without increasing the complexity of the control method, so that output voltage and current harmonics can be reduced, and the output waveform quality is increased. The carrier offset-based control method has the advantages that the real-time performance is good, the processing procedure is simple and realization is easy.

The invention discloses a predictive control system and a method for reducing the common-mode voltage of a three-level VIENNA rectifier system, which are used for solving the problems of high common-mode voltage of the three-level VIENNA rectifier system in a wind power generation system, zero-crossing point distortion of an AC side current and unbalance of a DC side neutral point voltage. The algorithm limits the common-mode voltage of the system to a very low range. The coupling problem of current zero-crossing distortion and DC neutral-point voltage imbalance control is solved. By classifying the space voltage vectors, the computational complexity is greatly reduced. The algorithm does not need current inner loop controller and PWM modulation module, and avoids the design of complex controller and the selection of complex parameters. The system and method have characteristics of simpleness, directness and effectiveness, which makes the algorithm has high application value.

The invention discloses an enhanced VSVPWM (virtual space vector pulse-width modulation) method. The method comprises steps as follows: space vectors are converted into virtual vectors through PWM, and the action time duty ratio of each virtual vector is calculated; duration per unit values of three-phase output voltage at states P and N are figured out according to the correspondence between the virtual vectors and actual space vectors; the duration per unit values of the three-phase output voltage at the states P and N are used as modulating waves respectively, and a three-phase switch state is obtained; small vector action time is adjusted according to the difference between voltage of two direct-current capacitors or the fluctuation magnitude of midpoint potential, and PWM output of an inverter is obtained. With the adoption of the method, the problem of virtual vector PWM midpoint potential cumulative deviation is solved, midpoint potential balance control can be realized within any modulation degrees, the low-frequency fluctuation of the midpoint potential can be completely eliminated, the anti-interference performance of a system is improved, sizes of the direct-current capacitors are reduced, and the output waveform quality is improved.

The invention discloses a two-stage nine-level inverter based on a bridge type multi-level switched capacitor module. The bridge type multi-level switched capacitor module is applied to a DC-DC converter link, so that a voltage of which the peak is 4 times of that of an input voltage is output, high-efficiency and high power density of a boost link are ensured, and the problem of bus-bar voltage imbalance existing during multi-level inversion is solved; bilateral switch asymmetrical H bridges are applied to a DC-AC converter link, an unequal carrier stacked PWM (Pulse-Width Modulation) controlstrategy is combined, nine-level AC output is realized, the DC bus-bar voltage utilization rate is improved, and the output waveform quality is optimized.

The invention provides a multilevel inverter based on a bridge modular switched capacitor. The multilevel inverter comprises a bridge modular multilevel switched capacitor module and an inverting module. During running of a system, the bridge modular multilevel switched capacitor module performs a conversion process of output voltage U, 2U, 4U and U through DC-DC conversion and performs DC-AC conversion through the inverting module. The multilevel inverter allows DC-DC conversion to be performed under high efficiency, high power density and high-voltage conversion ratio, a unipolar multi-frequency SPWM (sinusoidal PWM) method in the DC-AC conversion is optimized, the number of switch tubes is less than that of the traditional multilevel inverter module, and high-quality output waveform and low-harmonic content are achieved.

The invention discloses a five-level self-balanced inverter based on a bridge switched capacitor module and relates to a multi-level inverter. The five-level self-balanced inverter is provided with the bridge switched capacitor module and two half-bridge circuits. The bridge switched capacitor module is provided with an H bridge and a switched capacitor module. The H bridge is provided with four high-frequency switches S1, S2, S3, and S4. The switched capacitor module is provided with a first capacitor C1a and a second capacitor C1b which are in series connection with a first capacitor network, a third capacitor C2a and a fourth capacitor C2b which are in series connection with a second capacitor network, and four full-controlled devices MOSFET switching tubes S1a, S1b, S2a, and S2b. The two half-bridge circuits are formed by four full-controlled devices MOSFET switching tubes S5, S6, S7, and S8. The five-level self-balanced inverter based on the bridge switched capacitor module may output five levels including 0, +- / 2Ui, and + / -4Ui by controlling switch operating state, and achieves boosted output while outputting the multiple levels.

The invention discloses a control method of a hybrid-control cascaded multilevel inverter and a multilevel inverter. The controlling method comprises the following steps: obtaining output voltages of N groups of photovoltaic cells to get 1st, 2nd,..., ith,..., Nth output voltages; counting conduction angles theta1', theta2',..., thetai',...,thetaN' of the 1st, 2nd,..., ith,..., Nth output voltages; ceiling to obtain theta1, theta2, theta(i),..., theta(N); controlling the conductions of the 1st, 2nd,..., ith,..., Nth output voltages respectively by utilizing the conduction angles theta1, theta2, thetai,..., thetaN; obtaining step wave output voltages by utilizing a step wave algorithm; obtaining the output voltages of m groups of photovoltaic cells; utilizing an instantaneous value feedback algorithm to get instantaneous value feedback output voltages; and serially overlapping the step wave output voltages with the instantaneous value feedback output voltages to form a total output voltage, thus implementing the change from the DC (direct current) multilevel input into the AC (alternating current) level output. By using the scheme provided by the invention, the work frequency can be decreased, the conversion efficiency of the inverter is improved, the electromagnetic interference is reduced and the system structure is simplified.

The invention discloses a parallel variable frequency power supply for a high power and high voltage test, and belongs to the technical field of electric systems. The parallel variable frequency power supply comprises two or more parallel variable frequency power supply parts with current limiting reactors. The parallel variable frequency power supply solves the problem that a main variable frequency power supply controller decodes falsely due to the fact that the signal transmission quantity of optical fiber communication is large when two or more power supplies run in parallel; the parallel variable frequency power supply ensures that asynchronism of output voltage of the parallel variable frequency power supplies is controlled within 1 microsecond; the output synchronism of the variable frequency power supplies is improved; and circular current of output among the power supply parts is realized. In addition, as guard signals are arranged among a main variable frequency power supply and slave variable frequency power supplies, the deficiency in the prior art that when remedial operation cannot be conducted when the variable frequency power supplies fail is overcome.

The invention discloses an indirect matrix transformation type multi-phase multi-level permanent magnet motor system. The indirect matrix transformation type multi-phase multi-level permanent magnet motor system includes a double-stator multi-phase composite permanent magnet synchronous motor, wherein two independent five-phase three-level inverters supplies power for stator winding ports of the motor respectively; an independent controllable rectifier supplies power for each five-phase three-level inverter; the two controllable rectifiers can share one set of LC filter at the power grid side; the LC filter includes a three-phase grid-connected inductor and a three-phase filter capacitor which is connected with the three-phase grid-connected inductor in parallel; and the first five-phase three-level inverter and the second five-phase three-level inverter are respectively connected with the two stator winding ports of the double-stator multi-phase composite permanent magnet synchronous motor. The invention also discloses a control method of the indirect matrix transformation type multi-phase multi-level permanent magnet motor system. The indirect matrix transformation type multi-phase multi-level permanent magnet motor system and the control method thereof can significantly improve reliability, power density, torque smoothness and operation efficiency of the motor driving system, and can lay the foundation of solving the technical difficulty that a high capacity motor traction driving system requires compact designs, reliable operation and energy-efficient aspects.

The invention discloses a neutral-point voltage control system for parameter on-line tuning and a neutral-point voltage control method for parameter on-line tuning. The neutral-point voltage control system comprises a three-level inverter and a digital processing control module, wherein the digital processing control module comprises a sampling unit, a digital phase-locked loop unit, an output loop-closed control unit, a PI parameter online tuning unit, a neutral-point voltage PI control unit and an SVPWM (Space Vector Pulse Width Modulation) vector control unit; the output end of the SVPWM vector control unit is connected with each phase bridge arm of the three-level inverter through a driving circuit. The direct-current bias of the neutral-point voltage and the neutral-point voltage fluctuation can be restrained by the system and the method, so that the neutral-point voltage balance control can be realized.

The invention provides a control system for an all-digital single-pulse electroplating power supply, and relates to the technical field of an electronic circuit. The control system comprises an EEROM (electrically erasable read-only memory), a power amplifier board, a secondary temperature detection and protective module, a communication port, an analog amplifier, a PWM (pulse width modulation) signal drive transformer and a display module, wherein the EEROM is connected with a digital signal processing module and used for storing the working parameters of the power supply and storing the control parameters in power failure, the communication port is used for completing communication, the analog amplifier is used for amplifying the feedback voltage and a telecommunication signal, and the display module is used for a power supply state indicator lamp and a buzzer. The control system for the all-digital single-pulse electroplating power supply is high in pulse width precision, and the consistency of products in the metal surface processing and the product quality can be guaranteed.

The invention provides a circuit structure of a single-level single-phase large-step-up-ratio cascade connection voltage type convertor of a quasi impedance source. The circuit structure of the single-level single-phase large-step-up-ratio cascade connection voltage type convertor of the quasi impedance source is composed of an input direct-current power source or a single-phase alternating current power source, a high frequency combination modulation switch, a filter, a single-phase alternating current load or a direct-current load, wherein the input direct-current power source or the single-phase alternating current power source, the high frequency combination modulation switch, the filter, the single-phase alternating current load or the direct-current load are connected in a cascading mode in sequence. A large-step-up-ratio impedance network is connected between the input power source and the high frequency combination modulation switch. The large-step-up-ratio impedance network is formed by series connection of an energy storage inductor and n SLCC type two-port impedance network units, wherein the n SLCC type two-port impedance network units are the same and are connected in a cascading mode in sequence. The n is a natural number larger than one. Each SLCC type two-port impedance network unit is composed of a power diode or a four-quadrant power switch, an energy storage inductor and two energy storage capacitors. The high frequency combination modulation switch is composed of a two-quadrant power switch or a four-quadrant power switch. The convertor can effectively convert an unstable low-voltage direct current with a wide changing ranged or a single-phase alternating current into a stable and high-quality single-phase sinusoidal alternating current or direct current in a single-level mode and can be applied to occasions of electrical energy conversion with medium and small capacity.

The invention relates to a cascaded multi-mode photovoltaic grid-connected inverter and a modulation method thereof, belonging to the field of power conversion and new energy distributed grid-connected power generation. The modulation strategy can be adjusted and the working state of the switch can be adjusted to a nine-level, five-level or three-level mode according to the actual working condition, so as to optimize the quality of output waveform and reduce the overall loss. When the input power of the DC side is low, a nine-level or five-level output mode is adopted to improve the waveform quality of the grid-connection current and widen the grid-connection range. When the input power of the DC side is high, a three-level output mode is adopted to reduce the loss of the inverter and improve the efficiency of the system. Both the waveform quality of the current injected by the photovoltaic grid-connected inverter into the grid and the loss of the inverter are taken into account, whichis beneficial to improving the quality of the grid-connected power of the system and reducing the loss in the inverting process.

The invention discloses an ANPC five-level inverter and a model prediction control method thereof. The inverter includes three phases of bridge arms connected in parallel. Each phase of bridge arm includes eight IGBTs. Four IGBTs connected in series are connected with positive, negative and neutral points of a direct current bus, and the other four IGBTs connected in series are connected to outputof IGBT tubes one and three. An input end of each bridge arm is connected with a direct current voltage source. According to the ANPC five-level inverter and the model prediction control method thereof, novel model prediction control does not need to adjust PI parameters and positive and negative sequence separation as compared with traditional PI control methods, control is simple, the amount ofcalculation is greatly reduced, DSP realization is facilitated, a zero common mode voltage vector is selected for the leakage current problem existing in five-level photovoltaic grid-connected inverters, leakage currents can be completely eliminated, a redundant switch is selected for the neutral point potential imbalance problem existing in five-level ANPC inverters, neutral point potential balance control is realized, and flying capacitor equality control is realized. The inverter and the method can be applied to the field of renewable energy power generation such as photovoltaic power generation systems.

The invention relates to a nine-level inverter by adopting an asymmetric voltage source. The inverter comprises a direct-current power supply group and a full-bridge switch group. The direct-current power supply group is composed of two direct-current power supplies, four unidirectional power switch tubes, a bidirectional power switch tube and six uncontrollable diodes, the full-bridge switch group is of a traditional full-bridge structure, the direct-current power supply group is connected with the input end of the full-bridge switch group, and the midpoint of a first bridge arm and the midpoint of a second bridge arm of the full-bridge switch group are output ends of the inverter. According to the nine-level inverter, an asymmetric voltage is used as a direct-current power supply, compared with a multi-level inverter of a traditional structure, under the same output voltage level, the number of power switch devices and the complexity of the device are greatly reduced, the manufacturing and maintaining cost of the inverter is effectively reduced, and meanwhile the efficiency of the inverter and the reliability of the system are improved.

The invention provides submarine optical cable burial depth detection equipment. The submarine optical cable burial depth detection equipment comprises a transmitter, a submarine optical cable, a probe and a signal processing and displaying device. The transmitter is electrically connected with the submarine optical cable and outputs low-frequency sine waves to the submarine optical cable. The probe comprises a first coil, a second coil and a third coil, the first coil and the third coil are symmetrically arranged at the two ends of the probe, the second coil is located in the center of the probe, and the centers of the three coils are located on the same straight line. The second coil and the probe are coaxially arranged, and the axis of the first coil and the axis of the third coil are perpendicular to the axis of the probe. The probe wire moves in an area where a submarine optical cable to be detected is located. The first coil, the second coil and the third coil feed back measured induction electric signals to the signal processing and displaying device respectively. The signal processing and displaying device determines the route of the submarine optical cable and the distance between the probe and the submarine optical cable according to the three paths of induction electric signals. According to the invention, the burial depth of the submarine optical cable can be accurately determined.

The invention discloses a cascading type six-switch multilevel inverter. The cascading type six-switch multilevel inverter comprises multiple power units, wherein each power unit consists of a main switch group and a switch capacitor group, wherein the main switch group adopts a conventional full-bridge structure; the switch capacitor group comprises a switch capacitor, two power switch tubes and three uncontrollable diodes; a first bridge arm midpoint and a second bridge arm midpoint of each main switch group are used as output positive and negative ends of each power unit; and the inverter comprises the multiple power units in a cascading manner in sequence. According to the inverter, each power unit can generate five-level output voltage; when an output voltage of the same number of levels is realized, the number of the power switching devices is greatly reduced; the complexity of the device is lowered as well; and in addition, the cascading type six-switch multilevel inverter has the characteristics of high inversion efficiency and high reliability.

The invention discloses a method for active power filter self-adaption repetition and deadbeat compound control. An active power filter is formed by a voltage and current detection circuit, a master control circuit, a drive circuit and a main circuit. By utilizing a new self-adaption harmonic detection algorithm, and applying repetition and deadbeat soft start control technology, a compensation current, of which the value is the same with that of a harmonic current and the direction is opposite with that of the harmonic current. With the method, parameter variation in a grid can be adjusted, and the system is guaranteed to have relatively-fast dynamic response speed and relatively-high output waveform quality.

The invention relates to a clamping-type three-phase voltage-source type inverter and a control method thereof and belongs to the technical field of three-phase voltage-source type inverters. The clamping-type three-phase voltage-source type inverter comprises a direct-current power source, a three-phase three-level inverter bridge, a three-phase LC filter and a three-phase load. In order to control output voltage waveforms, a mathematical model of the three-level inverter is established, an instantaneous value control system of the output voltage is put forward, a scheme combining a fundamental-wave disturbance instantaneous value controlled internal model with a harmonic disturbance repetitive controlled internal model under rotating coordinates is adopted, disturbance of the internal models is realized to acquire voltage output waveforms high in quality by adopting structural controllers in parallel, and a control method for fixing resultant vectors is adopted with an aim to solve problems about voltage jump of the three-level inverter and neutral voltage potential balance. The clamping-type three-phase voltage-source type inverter is ideal in comprehensive output voltage performance and good in output waveform quality, and meanwhile, the problems about voltage jump and neutral voltage potential balance are solved.

The invention discloses a single carrier PWM method for achieving a stacked carrier effect and belongs to the technical field of electric system control. According to the technical scheme, a reference carrier signal and a modulating wave are generated at first; an instantaneous value of the modulating wave in each moment is divided by a reference carrier amplitude value to obtain a round number, the serial number of the carrier which has an intersection point with the modulating wave during equivalent adopting of stacked carriers is obtained, then instantaneous values of the carriers are made to be equivalent through longitudinal horizontal movement of a reference carrier and are compared with the instantaneous value of the modulating wave, and an output signal is obtained. According to the single carrier PWM method, the modulating effect of the stacked carriers with any number can be achieved conveniently with only one reference carrier, only one time of comparison operation between the carrier and the modulating wave needs to be executed for every moment, computation delay of a controller is effectively reduced, and output waveform quality and the response speed of a device are improved.

The invention discloses a small and efficient high-power solid-state modulator and belongs to the technical field of pulse power. The modulator comprises a solid-state modulator component and a pulse transformer (T), wherein the solid-state modulator component comprises a direct-current power supply (E1), an energy storage capacitor (C1) and a solid-state switch (V1). The direct-current power supply (E1) is used for charging the energy storage capacitor (C1). Output pulses of the modulator are obtained through the pulse transformer (T) after the energy storage capacitor (C1), the solid-state switch (V1) and the pulse transformer (T) form a discharge circuit. According to the small and efficient high-power solid-state modulator, the single solid-state switch is used, the equalization voltage and the connection consistency of the solid-state switch are not required to be considered, the voltage is low, insulation design can be achieved easily, the output waveform quality of the modulator is greatly improved, the circuit topological structure is simple, the size is small, the efficiency is high, modularization can be achieved easily, and the modulator is applicable to various platforms.