CN117914159A - Alternating current voltage regulating device - Google Patents

Alternating current voltage regulating device Download PDF

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Publication number
CN117914159A
CN117914159A CN202311815654.5A CN202311815654A CN117914159A CN 117914159 A CN117914159 A CN 117914159A CN 202311815654 A CN202311815654 A CN 202311815654A CN 117914159 A CN117914159 A CN 117914159A
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CN
China
Prior art keywords
bridge arm
voltage
capacitor
output
input
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202311815654.5A
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Chinese (zh)
Inventor
杨素梅
蔡卫峰
朱雷
李明
张雪姿
杨丹
楚中锋
梁文超
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shangqiu Power Supply Co of State Grid Henan Electric Power Co Ltd
Original Assignee
Shangqiu Power Supply Co of State Grid Henan Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shangqiu Power Supply Co of State Grid Henan Electric Power Co Ltd filed Critical Shangqiu Power Supply Co of State Grid Henan Electric Power Co Ltd
Priority to CN202311815654.5A priority Critical patent/CN117914159A/en
Publication of CN117914159A publication Critical patent/CN117914159A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/22Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M5/275Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/293Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M5/2932Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage, current or power

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)

Abstract

The invention discloses an alternating current voltage regulating device, which comprises input ends Ui1 and Ui2, wherein the input ends Ui1 and Ui2 are used for accessing alternating current power grid voltage; the upper end capacitor and the lower end capacitor are connected in series, and two end points of the upper end capacitor and the lower end capacitor are respectively connected with the input ends Ui1 and Ui2 and used for stabilizing input voltage; the upper bridge arm is respectively connected with the upper end capacitor in parallel, and the lower bridge arm is connected with the lower end capacitor in parallel and is used for realizing voltage-current conversion and electric energy bidirectional flow between input and output; output ends Uo1 and Uo2 which are connected with the RC buffer circuit in a bridging way are respectively connected with the upper bridge arm and the lower bridge arm; the absorption module is used for absorbing overvoltage and is respectively connected with the midpoint between the upper bridge arm and the lower bridge arm and the input end Ui 2; the discharging module is used for discharging overvoltage and is connected with the absorbing module; the invention can realize direct voltage stabilization of alternating current power supply, obviously reduce the complexity of a circuit and the cost of a device, effectively stabilize the power supply voltage of a power grid, and has the advantages of high response speed, low cost, high reliability, convenient maintenance and high efficiency.

Description

Alternating current voltage regulating device
Technical Field
The invention belongs to the technical field of alternating current voltage regulation of power grid power supply systems, and particularly relates to an alternating current voltage regulation device.
Background
With the improvement of the living standard of people and the popularization of household appliances, particularly the electricity consumption of residential users is greatly increased year by year, however, the update and transformation speeds of distribution lines of factories and mining units, residential communities, shops and the like are relatively delayed, so that the voltage at the tail end of the line is far lower than the allowable range, meanwhile, the voltage fluctuation is large, the overload phenomenon frequently occurs in a power grid, and huge damage is caused to electrical equipment. Meanwhile, as the newly added electric load adopts a large amount of rotating equipment such as a motor, a compressor and the like and power electronic devices, the reactive power demand is very large, and a large amount of higher harmonic current is generated, the loss of a low-voltage line is obviously increased, the power factor of the whole power grid is low, and the fluctuation of the power supply voltage is very large.
The common technical scheme for solving the problems of low voltage and large voltage fluctuation is that a power supply voltage stabilizing device is directly added on a power distribution network, and a voltage automatic regulating device is added on the power distribution network, so that the power supply voltage can be automatically regulated in real time and stabilized at a standard value, reactive power can be directly provided for electric equipment, and the actual power transmission capacity of a power distribution network is improved; the operation safety of the power supply transformer is improved; the abnormal conditions such as voltage flicker and the like caused by lightning strike, instantaneous short circuit, overload and the like of the high-voltage line are greatly improved, and the safety of electric equipment is protected.
For example, chinese patent CN204360256U discloses a contactless ac voltage stabilizer which adopts a multi-winding transformer and a multi-path thyristor switching switch to realize a voltage stabilizing function. However, the existing technology is step voltage regulation, meanwhile, in order to realize the step difference not to be too large, a plurality of paths of thyristor switching switches are needed, the circuit is complex, the cost is high, and meanwhile, the fast voltage fluctuation of a power grid cannot be realized because the thyristor switching speed is low, and the maximum speed is only 10 mS. Especially, when the regulated output voltage is at a high level, if the power grid voltage is rapidly increased, the output voltage can generate overvoltage due to low response speed, so that the safety of electric equipment is endangered.
In order to solve the above problems, it is necessary to develop an ac voltage regulator.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the alternating current voltage regulating device which has the advantages of high response speed, low cost, high reliability, convenience in maintenance and high efficiency.
The purpose of the invention is realized in the following way: an ac voltage regulating device comprising:
Input ends Ui1 and Ui2 connected with the power grid are used for accessing alternating current power grid voltage;
The upper end capacitor and the lower end capacitor are connected in series, and two end points of the upper end capacitor are respectively connected with the input ends Ui1 and Ui2 and are used for filtering high-frequency components of the voltage and the current of the power grid and stabilizing the input voltage;
the upper bridge arm is connected with the upper end capacitor in parallel and is used for realizing voltage-current conversion between input and output and realizing bidirectional flow of electric energy;
the lower bridge arm is connected with the lower end capacitor in parallel and is used for realizing voltage-current conversion between input and output and realizing bidirectional flow of electric energy;
the output ends Uo1 and Uo2 are respectively connected with the upper bridge arm and the lower bridge arm and serve as voltage output ports of the device, and an RC buffer circuit is connected between the output ends Uo1 and Uo2 in a bridging mode and used for eliminating peak voltage;
The absorption module is respectively connected with the midpoint between the upper bridge arm and the lower bridge arm and the input end Ui2 and is used for absorbing overvoltage generated in the working process of the circuit of the device;
and the discharging module is connected with the absorbing module and used for discharging the electric quantity stored in the absorbing module.
Preferably, the method further comprises:
the input inductor is connected in series with the input end Ui1 and is used for filtering out high-frequency components of the power grid current;
The output inductor is connected in series with the output end Uo1 of the device and is used for filtering out high-frequency components of output voltage and current.
Preferably, the midpoints of the upper bridge arm and the lower bridge arm are respectively used as two output ends Uo1 and Uo2 of the device, or are output through the output inductor.
Preferably, the upper bridge arm comprises a first upper pipe and a first lower pipe which are connected in series in the forward direction, the lower bridge arm comprises a second upper pipe and a second lower pipe which are connected in series in the forward direction, two bridge arms formed by semiconductor switching devices are respectively formed, two end points of the upper bridge arm are connected with the upper end capacitor in parallel, and two end points of the lower bridge arm are connected with the lower end capacitor in parallel.
Preferably, the semiconductor switching devices adopted by the first upper tube, the first lower tube, the second upper tube and the second lower tube are one of reverse conduction type IGBT, MOSFET, IGCT power semiconductors.
Preferably, the absorption module comprises a diode and a capacitor with one end connected with the cathode of the diode, the other end of the capacitor is connected with the input end Ui2, and the anode of the diode is connected with the midpoint between the upper bridge arm and the lower bridge arm; when the circuit of the device generates overvoltage, the current can charge the capacitor through the diode, so that the purpose of absorbing the overvoltage is achieved.
Preferably, the discharging module comprises a circuit in which a semiconductor switching device is connected in series with a discharging resistor, two ends of the series circuit are respectively connected with two ends of a capacitor in the absorbing module, and when the voltage of two ends of the capacitor exceeds a preset value, the semiconductor switching device is turned on to discharge the electric energy stored in the capacitor through the discharging resistor, so that the capacitor voltage is maintained in a set range.
Preferably, the RC snubber circuit includes a snubber resistor and a snubber capacitor connected in series, and two ends of the snubber resistor and the snubber capacitor are respectively connected with the output terminals Uo1 and Uo 2.
Due to the adoption of the technical scheme, the invention has the beneficial effects that: the invention adopts the upper bridge arm and the lower bridge arm which are respectively connected in parallel with the upper end capacitor and the lower end capacitor, and meanwhile, an RC buffer circuit is arranged at the output end, so that the total output voltage of Uo1 and Uo2 can be controlled by adjusting the PWM duty ratio of the switching devices of the upper bridge arm and the lower bridge arm, thereby reaching a preset voltage value, realizing direct voltage stabilization and bidirectional transmission of alternating current power supply; the invention adopts the absorption module and the discharge module, can absorb overvoltage generated in the working process of the circuit and discharge the overvoltage in time, and further effectively ensures the stability and reliability of power supply voltage transmission.
Drawings
Fig. 1 is a schematic electrical structure of an embodiment of the present invention.
Fig. 2 is a schematic electrical structure of another implementation of the invention.
Fig. 3 is a schematic diagram of the electrical principle of the absorption module of the present invention.
Description of the embodiments
The technical scheme of the invention is further specifically described below through examples and with reference to the accompanying drawings.
As shown in fig. 1, the present invention provides an ac voltage regulating device according to an embodiment, which includes: the input ends Ui1, ui2 of the power grid are connected for accessing the alternating current power grid voltage.
It comprises the following steps: the upper end capacitor 3 and the lower end capacitor 4 are connected in series, and two end points of the upper end capacitor 3 are respectively connected with the input ends Ui1 and Ui2 and are used for filtering high-frequency components of the voltage and the current of the power grid and stabilizing the input voltage.
It comprises the following steps: the upper bridge arm 1 is connected with the upper end capacitor 3 in parallel and is used for realizing voltage-current conversion between input and output and realizing bidirectional flow of electric energy; the lower bridge arm 2 is connected with the lower end capacitor 4 in parallel and is used for realizing voltage-current conversion between input and output and realizing bidirectional flow of electric energy; the voltages at two ends of the parallel capacitors are subjected to pwm modulation through the upper bridge arm 1 and the lower bridge arm 2, and a controllable voltage is output at the output ends Uo1 and Uo2, so that the purpose of voltage regulation is achieved; if Uo1, uo2 are used as inputs and Ui1, ui2 are used as outputs, reverse transmission of electric energy can be achieved.
It comprises the following steps: and the output ends Uo1 and Uo2 are respectively connected with the upper bridge arm 1 and the lower bridge arm 2 and serve as voltage output ports of the device, and an RC buffer circuit is bridged between the output ends Uo1 and Uo2 and used for eliminating spike voltage.
It comprises the following steps: the absorption module 5 is respectively connected with the midpoint between the upper bridge arm 1 and the lower bridge arm 2 and the input end Ui2 and is used for absorbing overvoltage generated in the working process of the circuit of the device; and a discharging module 6 connected with the absorbing module 5 for discharging the electric quantity stored in the absorbing module 5.
The midpoints of the upper bridge arm 1 and the lower bridge arm 2 are respectively used as two output ends Uo1 and Uo2 of the device, or are output through the output inductor 14.
The upper bridge arm 1 comprises a first upper pipe 7 and a first lower pipe 8 which are connected in series in the forward direction, the lower bridge arm 2 comprises a second upper pipe 9 and a second lower pipe 10 which are connected in series in the forward direction, two bridge arms which are formed by semiconductor switching devices are respectively formed, two end points of the upper bridge arm 1 are connected with the upper end capacitor 3 in parallel, and two end points of the lower bridge arm 2 are connected with the lower end capacitor 4 in parallel.
The semiconductor switching devices adopted by the first upper tube 7, the first lower tube 8, the second upper tube 9 and the second lower tube 10 are one of reverse conduction type IGBT, MOSFET, IGCT power semiconductors.
Specifically, as shown in fig. 3, the absorption module 5 includes a diode 15 and a capacitor 16 with one end connected to a cathode of the diode 15, the other end of the capacitor 16 is connected to the input end Ui2, and an anode of the diode 15 is connected to a midpoint between the upper bridge arm 1 and the lower bridge arm 2; when the device circuit generates overvoltage, current can charge the capacitor 16 through the diode 15, so that the purpose of absorbing the overvoltage is achieved.
The discharging module 6 comprises a circuit in which a semiconductor switching device and a discharging resistor are connected in series, wherein two ends of the series circuit are respectively connected with two ends of a capacitor 16 in the absorbing module 5, and when the voltage of the two ends of the capacitor 16 exceeds a preset value, the semiconductor switching device is turned on to discharge the electric energy stored in the capacitor 16 through the discharging resistor, so that the capacitor voltage is maintained in a set range.
The RC buffer circuit comprises a buffer resistor 11 and a buffer capacitor 12 which are connected in series, and two ends of the RC buffer circuit are respectively connected with the output ends Uo1 and Uo2 for eliminating peak voltage.
In the embodiment, PWM modulation is performed through coordination of an upper pipe and a lower pipe, so that the alternating current voltage regulation function and the energy bidirectional transmission function can be realized; the elimination of peak voltage can be realized through the RC capacitor; the absorption module and the discharge module can eliminate overvoltage; compared with the prior art, the invention obviously reduces the complexity of the circuit and the cost of the device, can effectively stabilize the power supply voltage of the power grid, and has the advantages of high response speed, low cost, high reliability, convenient maintenance and high efficiency.
As shown in fig. 2, the present invention provides another embodiment of an ac voltage regulating device, further including: an input inductor 13 connected in series with the input end Ui1 for filtering out high frequency components of the grid current; an output inductor 14 is connected in series with the output end Uo1 of the device and is used for filtering out high-frequency components of output voltage and current.
In this embodiment, by further arranging the inductors at the input end and the output end, high-frequency components of the output voltage and the output current can be further filtered, so that stability and safety of the circuit are improved.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same, and although the present invention has been described in detail with reference to the above-mentioned embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made to the specific embodiments of the present invention without departing from the spirit and scope of the present invention, and any modifications and equivalents are intended to be encompassed in the scope of the claims of the present invention.

Claims (8)

1. An ac voltage regulator, comprising:
input terminals (Ui 1, ui 2) connected to the power network for switching in an ac power network voltage;
The upper end capacitor (3) and the lower end capacitor (4), wherein the upper end capacitor (3) is connected with the lower end capacitor (4) in series, and two end points of the upper end capacitor are respectively connected with the input ends (Ui 1 and Ui 2) and are used for filtering high-frequency components of the voltage and the current of a power grid and stabilizing the input voltage;
the upper bridge arm (1) is connected with the upper end capacitor (3) in parallel and is used for realizing voltage-current conversion between input and output and realizing bidirectional flow of electric energy;
the lower bridge arm (2) is connected with the lower end capacitor (4) in parallel and is used for realizing voltage-current conversion between input and output and realizing bidirectional flow of electric energy;
Output ends (Uo 1, uo 2) which are respectively connected with the upper bridge arm (1) and the lower bridge arm (2) and are used as voltage output ports of the device, and RC buffer circuits are connected between the output ends (Uo 1, uo 2) in a bridging way and are used for eliminating peak voltages;
the absorption module (5) is respectively connected with the middle point between the upper bridge arm (1) and the lower bridge arm (2) and the input end (Ui 2) and is used for absorbing overvoltage generated in the working process of the circuit of the device;
And the discharging module (6) is connected with the absorbing module (5) and is used for discharging the electric quantity stored in the absorbing module (5).
2. The ac voltage regulator according to claim 1, further comprising:
an input inductor (13) connected in series with the input end (Ui 1) and used for filtering out high-frequency components of the power grid current;
And the output inductor (14) is connected in series with the output end (Uo 1) of the device and is used for filtering out high-frequency components of output voltage and current.
3. The ac voltage regulator according to claim 2, wherein: the midpoints of the upper bridge arm (1) and the lower bridge arm (2) are respectively used as two output ends (Uo 1, uo 2) of the device, or are output through the output inductor (14).
4. The ac voltage regulator according to claim 1, wherein: the upper bridge arm (1) comprises a first upper pipe (7) and a first lower pipe (8) which are connected in series in the forward direction, the lower bridge arm (2) comprises a second upper pipe (9) and a second lower pipe (10) which are connected in series in the forward direction, two bridge arms which are composed of semiconductor switching devices are respectively formed, two end points of the upper bridge arm (1) are connected with the upper end capacitor (3) in parallel, and two end points of the lower bridge arm (2) are connected with the lower end capacitor (4) in parallel.
5. The ac voltage regulator according to claim 4, wherein: the semiconductor switching devices adopted by the first upper tube (7), the first lower tube (8), the second upper tube (9) and the second lower tube (10) are one of reverse conduction type IGBT, MOSFET, IGCT power semiconductors.
6. The ac voltage regulator according to claim 1, wherein: the absorption module (5) comprises a diode (15) and a capacitor (16) with one end connected with the cathode of the diode (15), the other end of the capacitor (16) is connected with the input end (Ui 2), and the anode of the diode (15) is connected with the middle point between the upper bridge arm (1) and the lower bridge arm (2); when overvoltage is generated by the circuit of the device, current can charge the capacitor (16) through the diode (15), so that the purpose of absorbing the overvoltage is achieved.
7. The ac voltage regulator according to claim 6, wherein: the discharging module (6) comprises a circuit formed by serially connecting a semiconductor switching device and a discharging resistor, wherein two ends of the serial circuit are respectively connected with two ends of a capacitor (16) in the absorbing module (5), when the voltage of the two ends of the capacitor (16) exceeds a preset value, the semiconductor switching device is turned on, so that the electric energy stored in the capacitor (16) is discharged through the discharging resistor, and the capacitor voltage is maintained in a set range.
8. The ac voltage regulator according to claim 1, wherein: the RC buffer circuit comprises a buffer resistor (11) and a buffer capacitor (12) which are connected in series, and two ends of the RC buffer circuit are respectively connected with the output ends (Uo 1 and Uo 2).
CN202311815654.5A 2023-12-27 2023-12-27 Alternating current voltage regulating device Pending CN117914159A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311815654.5A CN117914159A (en) 2023-12-27 2023-12-27 Alternating current voltage regulating device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311815654.5A CN117914159A (en) 2023-12-27 2023-12-27 Alternating current voltage regulating device

Publications (1)

Publication Number Publication Date
CN117914159A true CN117914159A (en) 2024-04-19

Family

ID=90688908

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311815654.5A Pending CN117914159A (en) 2023-12-27 2023-12-27 Alternating current voltage regulating device

Country Status (1)

Country Link
CN (1) CN117914159A (en)

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