621 results about "Isolation transformer" patented technology

The invention relates to the technical field of hybrid inverters, and discloses a hybrid inverter supporting reactive compensation and a control method thereof, and the hybrid inverter comprises a DC input unit, a three-phase full-bridge inversion unit, a grid-connected switching unit, a signal acquisition unit and a digital control unit. The direct current input unit comprises a photovoltaic interface, a battery interface and a direct current bus and is used for converging photovoltaic and energy storage electric energy; the three-phase full-bridge inversion unit is composed of a power device and an LCL filter and converts direct current into alternating current. The grid-connected switching unit comprises a static switch and an isolation transformer and is used for controlling power grid connection; the signal acquisition unit detects voltage and current signals; and the digital control unit judges a grid-connected mode or an off-grid mode according to the signal, calculates a reactive current reference value and generates a PWM (Pulse Width Modulation) control signal so as to realize reactive compensation control in the grid-connected mode and the off-grid mode. According to the invention, reactive power compensation capability is provided in both grid-connected and off-grid operation modes, and stable operation of the inverter in various working conditions is ensured.

The present disclosure relates to circuits for connecting components of a hydrogen plant to a power grid to power the components in an efficient manner. In one implementation, power-side alternate current (AC) to direct current (DC) converters may be connected to a source power grid without the need for an isolation transformer by providing separate buses between the power-side AC-DC converters and load-side DC-DC converters instead of a shared DC bus between the converters. Other implementations for connecting components of a hydrogen plant to a power grid may include an adjustable transformer, such as a tappable transformer or an autotransformer, to connect any number of auxiliary loads of the plant to the power grid. The adjustable transformer may provide for various types of auxiliary load devices to connect to the power provided by the transformer at the same time, including both three-phase devices and one-phase devices.

The invention belongs to the field of power transmission line parameter measurement, and discloses a live-line testing device and method for mutual inductance line parameters and zero-sequence impedance parameters. The device comprises a double-circuit line simulation module, a pilot frequency excitation module, a power frequency simulation module, a synchronous acquisition module and a signal processing module. The isolation transformer simulates a double-circuit line, the pilot-frequency power supply provides pilot-frequency excitation signals, the measurement unit realizes synchronous acquisition, and the signal processing module performs anti-interference and amplification processing. The method comprises the steps of line simulation wiring, synchronous time synchronization, pilot frequency signal acquisition, parameter calculation and error verification, and pilot frequency parameters are converted into power frequency parameters by using a frequency conversion formula. According to the invention, power frequency interference can be effectively suppressed in a charged environment, high-precision measurement of zero-sequence impedance and mutual inductance parameters of a mutual inductance line is realized by using pilot frequency excitation and Beidou synchronization technologies, the measurement error is remarkably reduced, the safety and reliability are remarkably improved, and powerful technical support is provided for safe and stable operation of a power system.

The invention discloses a multi-energy micro-grid power supply system based on a hydrogen fuel cell and a control method. The micro-grid power supply system comprises an intelligent grid-connected switch, an electrical load, an isolation transformer, an energy storage converter, a hydrogen fuel cell system, an energy storage lithium battery system and a local energy management system. The control method comprises the steps that when a power grid loses power or a PCC switch is switched off, an energy storage converter PCS is automatically switched to an off-grid operation mode or is switched to an off-grid operation mode according to an off-grid command, and stored electric energy is continuously used for on-load operation; when the power grid recovers or is converted into grid connection in a planned manner, the PCS is automatically synchronized to a state which is synchronous with the power grid or according to a grid connection command, and the intelligent static switch is closed to be converted into grid connection operation. According to a coordination control strategy among the PCS converter, the intelligent grid-connected switch and the energy storage battery and an SOC grading strategy between the fuel battery and the energy storage battery, functions of millisecond-level fast switching of grid-connected and off-grid operation, variable load fast energy scheduling control of a load and the like are realized.

A bidirectional high voltage AC-DC converter includes a primary three-phase three-level T-type power factor correction circuit, a full-bridge switching circuit connected to the primary three-phase three-level T-type power factor correction circuit output, an isolated capacitor-inductor-inductor-capacitor (CLLC) resonant tank connected to the full-bridge switching circuit, a T-type full-bridge output topology circuit connected to the CLLC resonant circuit, and a controller that controls one or more of the components of the bidirectional isolated high voltage AC-DC converter. The primary three-phase three-level T-type power factor correction circuit and the secondary three-level circuit include a split DC-link bus with respective voltages that are actively controlled by the controller. The CLLC resonant converter circuit includes an isolation transformer that electrically isolates the primary side from the secondary side of the bidirectional isolated high voltage AC-DC converter. A control method includes synthesizing, via a modified space vector pulse width modulation (SVPWM) scheme or a variable-amplitude double-carrier sine-triangle PWM with capacitor bank middle point voltage control, one or more output voltages of the front end three-phase three-level T-type PFC circuit, wherein the modified SVPWM scheme is based, at least in part on a nearest four vectors technique.

The utility model discloses a soft start system based on excitation current reduction, which is characterized in that a time relay mainly controls the switching of a live wire between a power resistor and an alternating current contactor, the power resistor magnetizes a transformer at the moment of electrification, and the alternating current contactor is connected into a circuit by the time relay after the magnetization is completed; and after the power resistor is short-circuited, the circuit is cut out, so that the purpose of suppressing the excitation inrush current is finally achieved, the excitation effect caused by voltage abrupt change at the power-on moment of the isolation transformer can be avoided, and the excitation abrupt change of the isolation transformer during power-on is effectively reduced.

The invention discloses an efficient new energy transformer and an electric energy control system, and relates to the technical field of transformers, an input power conversion module is used for converting a direct current or alternating current variable voltage source into high-frequency alternating current for output, and a high-frequency isolation transformer module adopts a nanocrystalline-amorphous alloy mixed magnetic core. The windings are arranged in a three-layer staggered mode and provided with an oil dual-cooling system, and the output rectification inversion module is used for converting high-frequency alternating current into needed direct current or alternating current to be output and integrates the multi-phase synchronous rectification function and the active filtering function. By designing the nanocrystalline-amorphous alloy mixed magnetic core and the three-layer staggered winding, leakage inductance is reduced, the coupling coefficient is increased, the problems of leakage inductance and nonuniform magnetic flux caused by serious iron loss, large leakage inductance and unreasonable coil arrangement of a traditional single-material low-frequency iron core at medium and high frequencies are solved, hysteresis and eddy-current loss are effectively inhibited, and the service life of the low-frequency iron core is prolonged. The leakage inductance is minimized, the high-frequency transformation efficiency is improved, and the size and the weight are reduced.

The present disclosure relates to circuits for connecting components of a hydrogen plant to a power grid to power the components in an efficient manner. In one implementation, power-side alternate current (AC) to direct current (DC) converters may be connected to a source power grid without the need for an isolation transformer by providing separate buses between the power-side AC-DC converters and load-side DC-DC converters instead of a shared DC bus between the converters. Other implementations for connecting components of a hydrogen plant to a power grid may include an adjustable transformer, such as a tappable transformer or an autotransformer, to connect any number of auxiliary loads of the plant to the power grid. The adjustable transformer may provide for various types of auxiliary load devices to connect to the power provided by the transformer at the same time, including both three-phase devices and one-phase devices.

An apparatus for transferring power includes a first power converter coupled to a first power interface, an isolation transformer having a first transformer coil coupled to the first power converter and a second transformer coil magnetically coupled to and galvanically isolated from the first transformer coil, a second power converter coupled to the second coil of the isolation transformer and to a second power interface, a third transformer coil magnetically coupled to and galvanically isolated from the first transformer coil and magnetically coupled to the second transformer coil, and a third power interface for connecting the third transformer coil to a wireless power transmission (WPT) resonator.

The invention discloses an FMQL20S-based navigation computer system and a software and hardware collaborative architecture, and relates to the field of computer systems. Comprising a programmable fusion chip JFMQL20S4841, a 1553B transceiver and isolation transformer 6, an ARINC429 transceiver 7, a self-isolation RS422 chip 8, a self-isolation RS232 chip 9, an RC resistance-capacitance filter 10, an RS422 first interface chip 11, an RS422 second interface chip 15, an RS422 third interface chip 16 and an RS422 fourth interface chip 17. The method is used for solving the prominent defects of high design cost, poor universality, time-consuming calculation, incapability of miniaturization and the like due to the fact that various performance indexes such as fusion of different sensors and calculation of a large amount of data need to be realized in the current navigation computer system design.

The invention discloses an auxiliary power supply and an energy storage system. The auxiliary power supply comprises an input interface, at least two switch modules, an isolation transformer, an output module, a control module and a driving module. The input interface is configured to access a power supply module, the output module is configured to access a load, and working voltages of different switch modules are different; the isolation transformer comprises at least two primary sides and a secondary side coupled with the primary sides, different primary sides have different inductance values, each primary side is connected with the input interface through one switch module, the secondary side is electrically connected with the output module, and the control module is connected with the input interface and each switch module and is configured to detect the power supply voltage of the input interface; the control module is connected with each switch module and outputs a target control signal according to the power supply voltage, the driving module is connected with the control module and each switch module and is used for driving the target switch module to work according to the target control signal, and the target switch module is one of the switch modules. Therefore, the auxiliary power supply can stably and efficiently work in a wide working voltage range.

The invention relates to an expandable distributed voltage controller, and relates to the technical field of power grid electric energy management, the expandable distributed voltage controller comprises a series-parallel module comprising a parallel converter, a first series converter, a first DC capacitor and an isolation transformer, the DC side of the parallel converter is connected with the DC side of the first series converter through the first DC capacitor, and the DC side of the first series converter is connected with the isolation transformer through the isolation transformer; the alternating current side of the series converter is connected in series to the power grid side through the isolation transformer; and the series connection module comprises a second series connection converter, a second direct current capacitor and an isolation transformer, the second direct current capacitor is arranged on the direct current side of the second series connection converter, and the second series connection converter is connected to the load and / or the grid connection position in series through the isolation transformer. A plurality of problems can be solved while the power quality problem of the power grid is governed, so that the application range is wider.

A motor power source regulation circuit, a control method and an electronic device are provided. The motor power source regulation circuit includes a power factor correction circuit, an isolation circuit, a first power source conversion circuit, a second power source conversion circuit and a control circuit. The isolation circuit includes a first switch sub-circuit and an isolation transformer. The power factor correction circuit regulates an AC input signal to a first DC signal. The first switch sub-circuit converts the first DC signal to a first AC signal. The isolation transformer converts the first AC signal to two or more second AC signals. The first power source conversion circuit converts the second AC signal to a DC drive signal and outputs it to a DC motor. The second power source conversion circuit converts the second AC signal to an AC drive signal and outputs it to an AC motor.

The present invention belongs to the technical field of power electronic converters and discloses a medium-voltage distribution network flexible interconnection switch topology and control method. The medium-voltage distribution network flexible interconnection switch topology provided by the present invention includes three connected reactors L1, three connected reactors L3, two chain-type STATCOMs, two three-phase isolation transformers, two three-phase LC filters, two three-phase inverter circuits, and a DC port. Back-to-back three-phase converters are introduced at the ends of the chain-type STATCOMs of two feeders. Through the back-to-back three-phase converters, active power flow mutualization between the two medium-voltage chain-type STATCOMs, that is, between two different feeders, can be achieved. The present invention can achieve DC capacitor voltage balancing of the chain-type STATCOM submodules of the two feeders. Compared with the BTB-VSC commonly used in existing medium-voltage distribution network flexible interconnection demonstration projects, this solution has lower cost, simpler topology, easier control, and does not need to consider the active and reactive power decoupling issues between interconnected feeders, making it easy to promote and apply on a large scale.

The present disclosure relates to circuits for connecting components of a hydrogen plant to a power grid to power the components in an efficient manner. In one implementation, a power-side alternating current (AC) / direct current (DC) converter can be connected to a source power grid without the need for an isolation transformer by providing a separate bus between the power-side AC / DC converter and the load-side DC / DC converter, instead of a DC bus shared between the converters. Other implementations for connecting components of a hydrogen plant to a power grid may include an adjustable transformer, such as a tap-changing transformer or an autotransformer, for connecting any number of auxiliary loads of the plant to the power grid. The adjustable transformer may accommodate various types of auxiliary load devices for connecting to the power provided simultaneously by the transformer, including both three-phase and one-phase devices.

The invention discloses a hybrid distributed power flow controller topological structure and a control method thereof. The topological structure comprises a distribution network Sen transformer DST and a distributed static synchronous series compensator DSSC. The distribution network Sen transformer DST comprises a three-phase double-winding transformer and an on-load tap changer group; each phase of the three-phase double-winding transformer comprises a main winding and a secondary winding, the high-voltage end of the three-phase main winding is connected with the head end of the three-phase distribution line, the low-voltage end of the three-phase main winding is in star connection, and the neutral point of the three-phase main winding is grounded; the on-load voltage regulation switch group comprises six on-load voltage regulation switches which are respectively configured on the low-voltage side of the three-phase main winding and the three-phase secondary winding and provide three-phase first compensation voltage in a cross series connection mode; a distributed static synchronous series compensator DSSC provides a three-phase second compensation voltage; and the three-phase first compensation voltage and the three-phase second compensation voltage are superposed to synthesize a three-phase compensation voltage, and the three-phase compensation voltage is injected into a three-phase distribution line through a three-phase isolation transformer. The invention provides a series hybrid topology consisting of a DST (Digital Subscriber Terminal) and a DSSC (Digital Subscriber Subscriber Center).

The invention provides a vehicle-mounted charging circuit, a charging method and a charging system for an electric vehicle facing a 800V power battery, and relates to the field of manufacturing of related facilities of the electric vehicle, the circuit comprises a power factor correction module, a primary side power conversion module, a high-frequency isolation transformer, a bipolar charging module and a power battery equalization module; the input side of the power factor correction module is connected with an alternating current power grid, and the power factor correction module is used for rectifying alternating current into direct current; the primary side power conversion module is used for converting the direct current output by the power factor correction module into high-frequency alternating current; the high-frequency isolation transformer comprises at least two windings, and the two windings are connected with the primary side power conversion module and the bipolar charging module respectively; the bipolar charging module is connected with a 800V power battery, and the 800V power battery comprises two groups of 400V battery packs; the power battery equalization module is used for equalization management of two groups of 400V battery packs, and has the advantages of improving charging speed and efficiency of 800V power batteries and reducing equalization difficulty and cost.

The invention discloses an intelligent switching control electrician practical training identification device, which belongs to the technical field of electrical detection and comprises a practical training platform, an operation panel, an electrical carrier plate and a built-in PLC (Programmable Logic Controller), the system integrates power input, a first conversion unit composed of a first isolation transformer and a first contactor, a second conversion unit composed of a second isolation transformer and a second contactor, a control unit, a data storage module, an operation input unit, a feedback unit and a load output unit. A dual-safety interlocking structure combining software interlocking and contactor hardware interlocking is realized through a PLC, and two paths of power outputs cannot be switched on at the same time. The device has the functions of intelligent mode switching, real-time voltage monitoring, fusing and sudden stop dual protection, operation state feedback and practical training data storage, meets industrial-grade and safety-grade practical training requirements, is compact in structure and high in safety, supports closed-loop control and data tracing, and is suitable for modern electrician skill training and intelligent examination and identification.

The invention discloses a high-power modular radio frequency power amplifier capable of realizing wide-range power regulation. The high-power modular radio frequency power amplifier comprises a radio frequency load RL and m power amplification modules, the m power amplification modules are connected in parallel at a direct current side and are connected with an adjustable direct current bus voltage source; and the m power amplification modules are connected in parallel at the alternating current side and are superposed at the alternating current side. The output current of all the power amplification modules is transmitted to the radio frequency load RL; each power amplification module comprises a high-frequency switch power amplification unit, an LCL resonance network and an isolation transformer. According to the invention, through the configuration of the number of the power amplification modules and the adjustable cooperative control of the DC bus voltage source, the continuous adjustment of the output power is realized, meanwhile, the stable operation of each power amplification module under the resonance condition is ensured, the zero-voltage switching state is maintained, and the overall operation efficiency of the architecture and the adaptability of the radio frequency load are effectively improved.

The utility model discloses a power supply and a system used for nuclear fusion field anti-configuration. The power supply comprises a DC power supply, an inverter, a multi-output isolation transformer and N resonant branches. The direct-current power supply is electrically connected with the inverter; the inverter is used for converting the direct current into alternating current; the inverter is connected with the input end of the multi-output isolation transformer; and a plurality of output ends of the multi-output isolation transformer are respectively connected with one resonant branch. Structural improvement is carried out on the basis of a traditional field inversion configuration power supply technology, the charging function of capacitors of all branches of a coil is achieved through a transformer, all the branches are isolated from one another in the charging process, and mutual interference and influence are avoided; and meanwhile, the safety of other branches is not influenced when a single branch fails or is damaged in the working process.

The invention discloses a DCAC power conversion device and a power conversion method thereof, and the device comprises a full-bridge inverter which is used for converting an input DC voltage into a high-frequency AC voltage; the LCL resonance network is connected to the output end of the full-bridge inverter and is used for being equivalent to a current source in a target frequency range to realize zero voltage switching ZVS and harmonic suppression; the primary side of the high-frequency isolation transformer is connected with the LCL resonance network, and the secondary side of the high-frequency isolation transformer is connected with a load to realize electrical isolation of input and output; and the load phase angle detection module is used for detecting current and voltage signals of a load in real time, calculating a load phase angle # imgabs0 # hybrid control unit and dynamically switching control modes according to the numerical relationship between the load phase angle # imgabs1 # and a preset threshold # imgabs2 # so as to control the output current, and the control modes comprise pulse frequency modulation (PFM) and phase shift pulse width modulation (PS-PWM). According to the device and the method, through the cooperative operation of the LCL resonance network and the hybrid control unit, the problems of large switching loss, low constant current precision and difficulty in EMI suppression in high-frequency application are solved.

The application discloses a novel lung lobe-shaped magnetic shielding partial discharge detection device and a detection method. The device comprises an isolation transformer, a bushing, a detection electrode and a partial discharge instrument. A single-phase power supply is connected with a reactor in parallel, and then connected with an input end of the isolation transformer. One end of an output end of the isolation transformer is connected with the bushing, and then connected with the detection electrode. The other end of the output end of the isolation transformer is grounded. A grounding end of a to-be-detected lung lobe-shaped magnetic shielding is grounded, and the grounding end of the to-be-detected lung lobe-shaped magnetic shielding is connected with the partial discharge instrument. The to-be-detected lung lobe-shaped magnetic shielding and the detection electrode are correspondingly arranged to form an equivalent capacitor and are coupled and connected. The application can be used to determine whether there is a defect in the lung lobe-shaped magnetic shielding by performing a partial discharge test on the lung lobe-shaped magnetic shielding before the lung lobe-shaped magnetic shielding is assembled into a transformer. The application has the characteristics of high test efficiency and low applied voltage, and greatly improves the first-time pass rate of the transformer product provided with the lung lobe-shaped magnetic shielding.

The utility model provides a control circuit of a capsule endoscope system, which comprises a protection unit and a working unit, two ends of the protection unit are respectively connected with a power supply and the working unit, and the protection unit comprises a fuse, a leakage protection switch, a reactor, a filter and an isolation transformer which are connected in series. The reactor is closer to the power supply than the isolation transformer. According to the control circuit of the capsule endoscope system, the safety of the control circuit can be improved.

In the DAB converter, the control circuit (13) controls in a manner including a first period in which the first DC portion (E1, Ca) is conducted with the primary winding (n1) of the isolation transformer (TR1), and a second period in which both ends of the primary winding (n1) of the isolation transformer (TR1) are short-circuited within the first bridge circuit (11), in the case of step-down transmission of electric power from the first DC portion (E1, Ca) to the second DC portion (E2, Cb). The control circuit (13) generates: a first mode in which the fourth switching element (Q4) is off, and the first period is switched to the second period; a second mode in which the second switching element (Q2) is off, and the first period is switched to the second period; a third mode in which the first switching element (Q1) is off, and the first period is switched to the second period; and a fourth mode in which the third switching element (Q3) is off, and the first period is switched to the second period.

The invention discloses a large-capacity energy storage converter based on a DAB-ANPC cascade architecture, which comprises a pre-stage DC-DC converter and a post-stage DC-AC inverter which are cascaded, the pre-stage DC-DC converter adopts a dual active bridge (DAB) circuit and comprises a primary and secondary full bridge, a high-frequency isolation transformer, a series inductor and a blocking capacitor, and electrical isolation and wide voltage input are realized; the back-stage DC-AC inverter is a three-phase three-level active neutral point clamp (ANPC) topology, each phase of bridge arm comprises six full-control switches, loss is balanced through the clamp switches, and the output end of the back-stage DC-AC inverter is connected with the LCL filter. According to the invention, DAB power transmission is controlled and adjusted through single phase shift, and an ANPC switch tube conduction time sequence is dynamically allocated by adopting stacked carrier SPWM modulation, so that the problems of electrical isolation and wide voltage can be solved, and a new energy fluctuation scene is compatible; the device loss is balanced, local overheating is avoided, and the system efficiency and reliability are improved; soft switching and LCL filtering are cooperated, so that the switching loss and harmonic interference are reduced, and the cost is reduced; bidirectional energy flow is supported, and the charging and discharging requirements of an energy storage power station are met.

The invention provides a heating and heat preservation system and a temperature control method for a suspension type monorail turnout in a cold region, and the system is provided with a plurality of temperature detection devices, a temperature controller, an operation interface, an isolation transformer, a heating control box and a heating device, the temperature controller is interactively and electrically connected with the operation interface and the heating control box; the input end of the heating control box is connected with the isolation transformer, and the output end is connected with the heating device. The temperature control method comprises two processes: an active special processing process and an automatic temperature control process. The mode of multiple temperature control points, multiple temperature sections and multiple control processes is adopted, the usability, reliability and safety of the suspension type monorail turnout system in the cold environment are improved, and the method is suitable for popularization.

A flexible loop-closing device and its active power control method are disclosed. The device includes a power electronic transformer and distribution networks connected to both sides. Each phase of the power electronic transformer includes several power modules symmetrically arranged on both sides. Each power module includes an H-bridge section composed of power electronic switching devices T1-T4 and a DAB section composed of power electronic switching devices T5-T8. The power modules on both sides are connected through a resonant inductor Lr and an isolation transformer T. The H-bridge sections of the power modules on the same side are connected in series to the high-voltage AC bus of the distribution network on the same side. The active power control method is as follows: the AC side of the loop-closing device is controlled by a cascaded H-bridge, and the DC side is controlled by a DAB. When there is no active power flow control requirement, the DAB section does not need to work, and the DC bus voltage of the power modules on both sides is controlled by their respective cascaded H-bridges. This method can simplify the operation complexity of the loop-closing device to the greatest extent, ensure the stable operation of the loop itself and the reliability of the system power supply, and greatly reduce the system losses when there is no active power flow control requirement. The active power control strategy proposed in this invention can avoid frequent switching of the cascaded H-bridge control mode, ensure the stable operation of the flexible loop-closing system, and improve the dynamic response speed.

This utility model relates to an electric shock protection safety isolation distribution box, belonging to the technical field of distribution boxes. The electric shock protection safety isolation distribution box includes a distribution box, an air switch installed on the inner wall of the distribution box, an isolation transformer installed on the inner wall of the distribution box, a fixing component installed at the bottom of the isolation transformer, and a branch sealing component installed on the inner wall of the distribution box. This utility model allows adjustment of the distance between two L-shaped brackets by unscrewing a screw on one side and pulling a slider. The slider's sliding distance is adjusted according to the bottom hole position of the replacement isolation transformer. The screws are then tightened to fix the L-shaped brackets to the inner wall of the distribution box. Finally, the new isolation transformer is installed in the corresponding square slot. This improves versatility and flexibility, eliminating the need for custom-made enclosures for different transformers, reducing equipment replacement or upgrade costs, adapting to different power and model requirements, and broadening the applicable scenarios.

The application discloses a kind of transformer intelligent enclosed neutral point protection devices, including maintenance switch, lightning arrester, capacitive voltage divider, filter module, isolation transformer, charge-discharge module, voltage detection module, gap discharge unit, digital control unit;Filter module is used to filter the voltage signal of capacitive voltage divider after voltage division flows into isolation transformer, removes high-frequency signal, retains power frequency or its multiple frequency signal, realizes the distinction of transient overvoltage signal and steady overvoltage signal;Voltage detection module is used to detect the voltage amplitude of four capacitors in charge-discharge module, duration, and real-time transmission detection data to digital control unit, and digital control unit real-time uploads detection data to main control background, control pulse trigger controllable switch opens or closes, control discharge of enclosed discharge gap.The application realizes the accurate identification of transformer neutral point overvoltage type, solves the problem of high misoperation rate of existing device, damage transformer.

The present invention discloses a grid voltage regulator and a method for controlling high and low voltages in a grid, and relates to the field of power supply. The grid voltage regulator includes a high-frequency isolation transformer, two AC / AC modules, a first filter inductor, a second filter inductor, an AC grid equivalent power supply, a grid capacitor, and a load; wherein the first AC / AC module includes four switching tubes and the second AC / AC module includes four capacitors respectively. The primary side voltage Vp of the high-frequency isolation transformer is controlled by the first AC / AC module; the secondary side voltage Vq is obtained by induction of the secondary side of the high-frequency isolation transformer, and then the voltage Vs of the grid capacitor is controlled by the second AC / AC module; by superimposing the voltage Vs and the grid voltage Vg, the high and low voltage control of the grid voltage Vg can be achieved. The present invention adopts an AC to AC energy one-stage conversion architecture to achieve the control of voltage too low and too high problems, which greatly reduces the cost while improving work efficiency and reducing the size of the device.