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CN-224233346-U - Power supply voltage adjusting device based on inverter circuit

CN224233346UCN 224233346 UCN224233346 UCN 224233346UCN-224233346-U

Abstract

The embodiment of the application provides a power supply voltage regulating device based on an inverter circuit, which comprises an input circuit, a voltage regulating circuit, an inverter circuit and a follow current circuit, wherein the input circuit carries out filtering treatment on input alternating current and outputs the input alternating current through an output end of the input circuit, the voltage regulating circuit regulates the input alternating current through the modulation of the working states of switching devices in a first switching device group and a second switching device group, the output end of the voltage regulating circuit outputs voltage and simultaneously supplies power to a load as an output end of the power supply voltage regulating device based on the inverter circuit, the inverter circuit is configured to regulate reactive current and harmonic current of the input alternating current or the output end of the power supply voltage regulating device, and the follow current circuit is configured to enable the voltage regulating circuit and the inverter circuit to form a follow current path to absorb overvoltage and spike voltage generated by the voltage regulating circuit. The embodiment of the application has the advantages of simple structure, effective guarantee of the stability of the power grid voltage, quick response, low cost, simple and convenient control, high reliability and the like.

Inventors

  • ZHANG DONGSHENG
  • HAN YONG
  • JIANG CHUNLIN
  • ZHANG ZHENHUA
  • WANG LIPING
  • WANG YU
  • LI DENGHONG

Assignees

  • 新能动力（北京）电气科技有限公司

Dates

Publication Date
20260512
Application Date
20250528

Claims (17)

  1. 1. A power supply voltage regulating device based on an inverter circuit is characterized by comprising an input circuit, a voltage regulating circuit, an inverter circuit and a follow current circuit, The input circuit comprises an input end, an output end and a common end, wherein the input end is coupled with one end of input alternating current, the common end is coupled with the other end of the input alternating current or a zero line, and the input circuit carries out filtering treatment on the input alternating current and outputs the input alternating current through the output end of the input circuit; The voltage regulating circuit comprises a first switching device group and a second switching device group, wherein the first switching device group and the second switching device group are coupled in series to form a series circuit, one end point of the series circuit is coupled with the output end of the input circuit, the other end point of the series circuit is coupled with the other end or a zero line of input alternating current, and the midpoint of the series circuit is used as the output end of the voltage regulating circuit; The inverter circuit comprises two alternating current ports and two direct current ports, the two direct current ports of the inverter circuit are respectively coupled with the two direct current ports of the follow current circuit, and the inverter circuit is configured to adjust direct current voltage input into the inverter circuit, reactive current input into alternating current or harmonic current at the output end of the power supply voltage adjusting device; The freewheeling circuit comprises an input port and two direct current ports, the input port of the freewheeling circuit is coupled with the voltage regulating circuit, the two direct current ports of the freewheeling circuit are coupled with the two direct current ports of the inverting circuit, and the freewheeling circuit is configured to enable the voltage regulating circuit and the inverting circuit to form a freewheeling path so as to absorb overvoltage and spike voltage generated by the voltage regulating circuit.
  2. 2. The inverter circuit-based supply voltage regulating device of claim 1, wherein the first switching device group of the voltage regulating circuit comprises a first transistor and a second transistor in series, and the second switching device group comprises a third transistor and a fourth transistor in series.
  3. 3. The inverter circuit-based power supply voltage adjusting device according to claim 1, wherein the freewheel circuit comprises an input port, the freewheel circuit comprises two diodes, the two diodes are connected in series in the same direction, two end points formed after the connection are respectively used as two direct current ports of the freewheel circuit, and a node between the two diodes is used as one input port of the freewheel circuit and is coupled with a node between a first switching device group and a second switching device group of the voltage adjusting circuit.
  4. 4. The inverter-based supply voltage regulating device of claim 2, wherein the freewheel circuit comprises two input ports, the freewheel circuit comprises two diodes, wherein the cathode of one diode is coupled to the anode of the dc port of the inverter circuit, the anode of the other diode is coupled to the cathode of the dc port of the inverter circuit, the anode of the one diode and the cathode of the other diode serve as the two input ports of the freewheel circuit, and are respectively coupled to the intermediate node of the two transistors in the first switching device group and the intermediate node of the two transistors in series in the second switching device group.
  5. 5. The inverter-based power supply voltage regulating device of claim 1, wherein one ac port of the inverter circuit is coupled to an output of the input circuit, or an output of the voltage regulating circuit, or an output of the inverter-based power supply voltage regulating device, and the other ac port of the inverter circuit is coupled to the other end of the input ac or a zero line, the inverter circuit comprises an inverter bridge arm, two dc supporting capacitors, a first inductor, The inverter bridge arm consists of an upper transistor and a lower transistor which are connected in series, and the anode and the cathode of the inverter bridge arm form two direct current ports of the inverter circuit; The two direct current support capacitors are connected in series, two end points formed after the two direct current support capacitors are respectively coupled with the positive electrode and the negative electrode of the inverter bridge arm, and a node between the two direct current support capacitors is used as the other alternating current port of the inverter circuit; One end of the first inductor is coupled with the middle point of the inversion bridge arm, the other end of the first inductor is used as an alternating current port of the inversion circuit, and the first inductor is used for filtering out high-frequency pulsating current of output current of the inversion circuit.
  6. 6. The inverter-based power supply voltage regulating device of claim 1, wherein one ac port of the inverter circuit is coupled to an output of the input circuit, or an output of the voltage regulating circuit, or an output of the inverter-based power supply voltage regulating device, and the other ac port of the inverter circuit is coupled to the other end of the input ac or a zero line, the inverter circuit comprises two inverter legs, a dc supporting capacitor, a second inductor, Each inverter bridge arm is formed by connecting an upper transistor and a lower transistor in series, the anodes of the two inverter bridge arms are coupled to form one direct current port of the inverter circuit, and the cathodes of the two inverter bridge arms are coupled to form the other direct current port of the inverter circuit; the direct current support capacitor is connected with the two inversion bridge arms in parallel; One end of the second inductor is coupled with the middle point of one inversion bridge arm, the other end of the second inductor is used as one alternating current port of the inversion circuit, and the middle point of the other inversion bridge arm is used as the other alternating current port of the inversion circuit.
  7. 7. The inverter-based power supply voltage regulating device of claim 1, wherein said input circuit comprises a first capacitor, One end of the first capacitor is coupled with the input end of the input circuit and serves as the output end of the input circuit, and the other end of the first capacitor serves as the common end of the input circuit and is coupled with the other end of the input alternating current or a zero line.
  8. 8. The inverter-based power supply voltage regulating device of claim 1, wherein the input circuit comprises a third inductor, a second capacitor, One end of the third inductor is coupled with the input end of the input circuit, and the other end of the third inductor is coupled with one end of the second capacitor and is simultaneously used as the output end of the input circuit; The other end of the second capacitor is used as a common end of the input circuit and is coupled with the other end of the input alternating current or a zero line.
  9. 9. The inverter-based power supply voltage regulating device of claim 1, further comprising an output circuit comprising a fourth inductor, a third capacitor, One end of the fourth inductor is coupled with the output end of the voltage regulating circuit, and the other end of the fourth inductor is coupled with one end of the third capacitor and is simultaneously used as an output port of the power supply voltage regulating device based on the inverter circuit; the other end of the third capacitor is coupled with the other end of the input alternating current or a zero line; The fourth inductor and the third capacitor are used for eliminating voltage ripple and current ripple of the output end of the voltage regulating circuit and are coupled to a load.
  10. 10. A power supply voltage regulating device based on an inverter circuit is characterized by comprising three input circuits, three voltage regulating circuits, an inverter circuit and a follow current circuit, Each input circuit comprises an input end, an output end and a common end, wherein the input end is coupled with one phase of three-phase input alternating current, the common end is coupled with a zero line of the three-phase input alternating current, and the three input circuits are used for carrying out filtering treatment on the three-phase input alternating current and outputting the three-phase input alternating current through the output ends of the three input circuits; Each voltage regulating circuit comprises a first switching device group and a second switching device group, wherein the first switching device group and the second switching device group are coupled in series to form a series circuit, one end point of the series circuit is coupled with the output end of one input circuit, the other end point of the series circuit is coupled with a zero line of three-phase input alternating current, and the midpoint of the series circuit is used as the output end of the voltage regulating circuit; The inverter circuit comprises three alternating current ports and two direct current ports, and is configured to regulate direct current voltage input into the inverter circuit, regulate reactive current and harmonic current of three-phase input alternating current or the output end of the power supply voltage regulating device; The freewheeling circuit comprises an input port and two direct current ports, the input ports of the freewheeling circuit are respectively coupled with the three voltage regulating circuits, the two direct current ports of the freewheeling circuit are coupled with the two direct current ports of the inverter circuit, and the freewheeling circuit is configured to enable the three voltage regulating circuits and the inverter circuit to form a freewheeling path so as to absorb overvoltage and spike voltage generated by the three voltage regulating circuits.
  11. 11. The inverter-based power supply voltage adjusting device as claimed in claim 10, wherein, The first switching device group comprises a first transistor and a second transistor which are connected in series, and the second switching device group comprises a third transistor and a fourth transistor which are connected in series.
  12. 12. The inverter-based power supply voltage regulating device of claim 10, wherein the freewheel circuit comprises three input ports, the freewheel circuit comprises three sets of diodes connected in parallel in pairs, Each group of diodes connected in parallel form two endpoints, a first endpoint of each group of diodes connected in parallel is coupled to serve as one direct current port of the follow current circuit, and a second endpoint of each group of diodes connected in parallel is coupled to serve as the other direct current port of the follow current circuit; And the three intermediate nodes of the diodes which are connected in series in the same direction form three input ports of the follow current circuit and are respectively coupled with the nodes in the middle of the first switching device group and the second switching device group of the three voltage regulating circuits.
  13. 13. The inverter circuit-based supply voltage regulation device of claim 11 wherein the freewheel circuit includes six input ports, the freewheel circuit including a first set of diodes, a second set of diodes, The first group of diodes comprises three diodes, wherein cathodes of the three diodes are coupled with each other and with anodes of direct current ports of the inverter circuit, anodes of the three diodes form three input ports of the freewheel circuit and are coupled with intermediate nodes of two transistors connected in series of a first switching device group or a second switching device group of the three voltage regulating circuits respectively; The second group of diodes comprises three other diodes, wherein anodes of the three other diodes are coupled with each other and with cathodes of direct current ports of the inverter circuit, cathodes of the three other diodes form three other input ports of the freewheel circuit and are coupled with intermediate nodes of two transistors connected in series of the second switching device group or the first switching device group of the three voltage regulating circuits respectively.
  14. 14. The inverter-based power supply voltage regulating device of claim 10, wherein three ac ports of the inverter circuit are coupled to the output terminals of the three input circuits, or the output terminals of the three voltage regulating circuits, or the output terminals of the inverter-based power supply voltage regulating device, respectively, two dc ports of the inverter circuit are coupled to two dc ports of the freewheel circuit, respectively, the inverter circuit comprises three inverter legs, a dc supporting capacitor, and three inductors, Each inverter bridge arm is formed by connecting an upper transistor and a lower transistor in series, the anodes of the three inverter bridge arms are coupled to form one direct current port of the inverter circuit, and the cathodes of the three inverter bridge arms are coupled to form the other direct current port of the inverter circuit; The direct current support capacitor is connected with the three inversion bridge arms in parallel; And three ends of the three inductors are respectively coupled with three midpoints of the three inverter bridge arms, and three other ends of the three inductors are respectively used as three alternating current ports of the inverter circuit.
  15. 15. The inverter circuit-based power supply voltage adjusting device according to claim 14, wherein the dc supporting capacitor of the inverter circuit comprises an upper capacitor group and a lower capacitor group, the two capacitor groups are connected in series, two end points formed after the series connection are respectively coupled with the positive pole and the negative pole of the inverter bridge arm, and a node in the middle of the two capacitor groups is used as a fourth ac port of the inverter circuit and is coupled with a zero line of the three-phase input ac.
  16. 16. The inverter-based power supply voltage regulating device of claim 10 wherein said input circuit comprises a first capacitor, One end of the first capacitor is coupled with the input end of the input circuit and serves as the output end of the input circuit, and the other end of the first capacitor serves as the common end of the input circuit and is coupled with a zero line of three-phase input alternating current.
  17. 17. The inverter-based power supply voltage regulating device of claim 10 further comprising three output circuits, each output circuit comprising a fourth inductor, a third capacitor, One end of the fourth inductor is coupled with the output end of the corresponding voltage regulating circuit, and the other end of the fourth inductor is coupled with one end of the third capacitor and is simultaneously used as an output port of the power supply voltage regulating device based on the inverter circuit; The other end of the third capacitor is coupled with a zero line of the three-phase input alternating current; The fourth inductor and the third capacitor are used for eliminating voltage ripple and current ripple of the output ends of the three voltage regulating circuits and are coupled to a load.

Description

Power supply voltage adjusting device based on inverter circuit Technical Field The embodiment of the application relates to the technical field of power generation, transformation or power distribution, in particular to a power supply voltage regulating device based on an inverter circuit. Background With the continuous development of economy, the social electricity consumption increases year by year, especially for residential users. However, distribution lines in factories, mines, residential communities and shops are updated and remodelled later, resulting in line end voltages below standard, large voltage fluctuations, and frequent grid overload. This makes it difficult for some electrical devices to function properly, which is prone to damage. In addition, the newly added equipment such as a motor, a compressor and the like has high reactive power requirements, and generates a large amount of higher harmonic current, so that the loss of a low-voltage line is increased, the power factor of a power grid is reduced, and the fluctuation of the power supply voltage is aggravated. In order to solve the problems of low voltage and voltage fluctuation, the related technical solution is to add a power supply voltage stabilizing device on a power distribution network. The automatic voltage regulating device can regulate the power supply voltage in real time, so that the power supply voltage is stabilized at a standard value, reactive power is directly supplied to electric equipment, the power transmission capacity of a power distribution network is improved, the operation safety of a power supply transformer is enhanced, abnormal conditions such as voltage flicker caused by lightning stroke, short circuit and the like are remarkably improved, and the safety of the electric equipment is protected. However, in the process of adjusting power supply in real time through the voltage automatic adjusting device in the related art, there are often situations of unmatched circuit impedance, ripple, clutter and the like, and the related art has not yet proposed an effective technical solution, so that improvement is needed. Disclosure of utility model The embodiment of the application mainly aims to provide a power supply voltage regulating device based on an inverter circuit, which is used for solving the problems of ripple waves, clutter and the like existing in the prior art of real-time regulation of circuit impedance mismatch in power supply. According to a first aspect of an embodiment of the present application, there is provided a supply voltage adjusting device based on an inverter circuit, the device including an input circuit, a voltage adjusting circuit, an inverter circuit, and a freewheel circuit; the input circuit comprises an input end, an output end and a common end, wherein the input end is coupled with one end of input alternating current, the common end is coupled with the other end of the input alternating current or a zero line, and the input circuit carries out filtering treatment on the input alternating current and outputs the input alternating current through the output end of the input circuit; the voltage regulating circuit comprises a first switching device group and a second switching device group, wherein the first switching device group and the second switching device group are coupled in series to form a series circuit, one end point of the series circuit is coupled with the output end of the input circuit, the other end point of the series circuit is coupled with the other end or a zero line of the input alternating current, the middle point of the series circuit is used as the output end of the voltage regulating circuit, the voltage regulating circuit regulates the input alternating current through modulating the working states of the switching devices in the first switching device group and the second switching device group, and outputs voltage through the output end of the voltage regulating circuit, and simultaneously, the voltage regulating circuit is used as the output end of the power supply voltage regulating device based on the inverter circuit to supply power to a load, the inverter circuit comprises two alternating current ports and two direct current ports, the two direct current ports of the inverter circuit are respectively coupled with the two direct current ports of the inverter circuit, the inverter circuit is configured to regulate the direct current voltage input into the inverter circuit, regulate the input voltage of the input voltage regulating the input device or the output end of the power supply voltage regulating device, the reactive current input from the harmonic circuit comprises the input port of the harmonic circuit, and two direct current ports, the input port of the follow current circuit is coupled with the voltage regulating circuit, the two direct current ports of the follow current circuit are coupled with the two direct current ports of the inverter