CN214626368U

CN214626368U - AC voltage regulator

Info

Publication number: CN214626368U
Application number: CN202121157556.3U
Authority: CN
Inventors: 张东胜; 姜淳琳; 许玉林; 成世杰
Original assignee: New Dynamic Beijing Smart Energy Technology Co ltd
Current assignee: New Dynamic Beijing Smart Energy Technology Co ltd
Priority date: 2021-05-27
Filing date: 2021-05-27
Publication date: 2021-11-05
Anticipated expiration: 2031-05-27

Abstract

The utility model discloses an exchange regulator, it is including input (Ui 1, Ui 2), input capacitance (3), upper bridge arm (1), lower bridge arm (2), absorption module (4) and discharge module (14) of connecting the electric wire netting, through adjusting upper bridge arm (1), lower bridge arm (2) in switching device's PWM duty cycle, then steerable Uo1, Uo2 output total voltage to reach a predetermined magnitude of voltage. The utility model discloses an alternating current voltage regulator and control method can realize alternating current power supply's direct steady voltage, compares and has had the technique, is showing and has reduced circuit complexity and device cost, can effectively stabilize electric wire netting supply voltage, and it has response speed fast, and is with low costs, and control method is simple, and the reliability is high, maintains convenient, efficient.

Description

AC voltage regulator

Technical Field

The utility model relates to an exchange regulator for electric wire netting power supply system belongs to the power electronics field.

Background

With the improvement of living standards of people and the popularization of household appliances, the electricity consumption of residential users is greatly increased year by year, however, the updating and transformation speed of distribution lines of factories and mining units, residential districts, shops and the like is relatively delayed, so that the voltage at the tail end of the line is far lower than an allowable range, the voltage fluctuation is large, the overload phenomenon commonly and frequently occurs to a power grid, the non-lighting loads of washing machines, air conditioners, televisions and the like are difficult to work normally, and great damage is caused to electrical equipment. Meanwhile, as the newly added electrical loads adopt a large number of rotating equipment and power electronic devices such as motors and compressors, the reactive power is greatly required, and a large number of higher harmonic currents are generated, the loss of a low-voltage line is remarkably increased, the power factor of the whole power grid is low, and the fluctuation of the power supply voltage is large.

The optimal scheme for solving the problems of low voltage and large voltage fluctuation is to directly install a power supply voltage stabilizing device on the power distribution network. The voltage automatic regulating device is additionally arranged for the low-voltage power grid, 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 transmission capacity of the power distribution network is improved; the operation safety of the power supply transformer is improved; the abnormal conditions such as voltage flicker caused by lightning stroke, instant short circuit, overload and the like of the high-voltage line are greatly improved, and the safety of electric equipment is protected.

Chinese patent CN204360256U discloses a contactless ac voltage stabilizer, which uses a multi-winding transformer and a multi-channel thyristor switch to implement the voltage stabilizing function. The technology is step voltage regulation, simultaneously, in order to realize that the step difference is not too large, a plurality of thyristor switch is needed, the circuit is complex, the cost is high, and simultaneously, because the thyristor switch has low switching speed, the fastest speed is only 10mS, and the technology cannot be applied to the rapid voltage fluctuation of a power grid. Particularly, when the regulated output voltage is in a high level, if the voltage of a power grid rapidly jumps, the output voltage can generate overvoltage due to slow response speed, and the safety of electric equipment is damaged.

Disclosure of Invention

The utility model aims at designing an exchange regulator, can effectively stabilize electric wire netting supply voltage, can realize electric energy bidirectional transmission, it has that response speed is fast, and is with low costs, and the reliability is high, and control is simple, maintains convenient, efficient.

The utility model discloses an exchange regulator, it includes:

the input ends (Ui 1, Ui 2) of the power grid are connected, and the alternating current power grid voltage is accessed;

the input capacitor (3), two end points of the input capacitor (3) are respectively connected with the input ends (Ui 1, Ui 2) and are used for filtering high-frequency components of the voltage and the current of the power grid and stabilizing the input voltage;

one end of the upper bridge arm (1) is connected with an input end (Ui 1), and the other end is connected with an output end (Uo 1), so that voltage and current conversion between input and output can be realized, and bidirectional electric energy flow can be realized;

one end of the lower bridge arm (2) is connected with an output end (UO 1), and the other end of the lower bridge arm is connected with an input end (Ui 2) for voltage and current conversion between input and output and realizing bidirectional electric energy flow;

the absorption module (4) is respectively connected with the midpoint of the upper bridge arm (1), the midpoint of 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 (14) is connected with the absorption module (4) and is used for discharging the electric quantity stored in the absorption module (4).

The utility model discloses an AC voltage regulator, which also comprises an input inductor (5) which is connected in series with the input end of the power grid and is used for filtering the high-frequency component of the power grid current; the device also comprises an output inductor (6) which is connected in series with the output end of the device and is used for filtering high-frequency components of output voltage and current.

The utility model discloses an alternating current voltage regulator, upper bridge arm (1) and lower bridge arm (2) include two semiconductor switch device top tubes (7) and low tube (8), top tube (10) and low tube (9) that reverse series connection respectively, form two bridge arms of constituteing by semiconductor switch device, the mid point of two bridge arms connects output inductance (6), perhaps as the output (UO 1) of this device; the semiconductor switch device is one of power semiconductors such as reverse conducting IGBT, MOSFET, IGCT and the like.

The utility model relates to an alternating current voltage regulating device, the upper bridge arm (1) and the lower bridge arm (2) respectively comprise two semiconductor switch device upper tubes (7) and lower tubes (8), upper tubes (10) and lower tubes (9) which are connected in series reversely, so as to form two bridge arms consisting of semiconductor switch devices; the common drain electrode of the upper tube (7) and the common drain electrode of the lower tube (8) are connected in series, and the upper tube (10) and the common source electrode of the lower tube (9) are connected in series, or the common source electrode of the upper tube (7) and the lower tube (8) are connected in series, and the common drain electrode of the upper tube (10) and the common drain electrode of the lower tube (9) are connected in series; the semiconductor switch device is one of power semiconductors such as reverse conducting IGBT, MOSFET, IGCT and the like.

An exchange voltage regulator, absorption module (4) include: the diode (11) and the diode (12) are connected with the common cathode, wherein the anode of the diode (11) is connected with the midpoint of the upper bridge arm (1), and the anode of the diode (12) is connected with the input end (Ui 2);

one end of the capacitor (13) is connected with the common end of the diode (11) and the diode (12), and the other end of the capacitor is connected with the midpoint of the lower bridge arm (2); when the circuit of the device generates overvoltage, the current can charge the capacitor (13) through the diode (11) or the diode (12), thereby achieving the purpose of absorbing the overvoltage.

An exchange regulator, module (14) of discharging include the circuit of semiconductor switch device and discharge resistance series connection, series circuit's both ends are respectively with capacitor (13) both ends in absorption module (4) are connected, when capacitor both ends voltage surpassed the default, open semiconductor switch device, make the electric energy of capacitor (13) storage pass through discharge resistance discharges to make electric capacity voltage maintain a settlement scope.

The utility model adopts the above technical scheme, can produce following profitable technological effect:

the utility model discloses can realize alternating current power supply's direct steady voltage and bidirectional transmission, compare the technique that has, show and reduce circuit complexity and device cost, can effectively stabilize electric wire netting supply voltage, it has that response speed is fast, and is with low costs, and control is simple, and the reliability is high, maintains convenient, efficient.

Drawings

Fig. 1 is an electrical block diagram of an ac voltage regulator according to the present invention.

Fig. 2 is another electrical block diagram of an ac voltage regulator according to the present invention.

Fig. 3 is an electrical schematic diagram of the absorption module (4) of the present invention.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "comprising" and "having," and any variations thereof, as referred to in the embodiments of the present application, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Fig. 1 is an electrical block diagram of an ac voltage regulator according to the present invention. The network voltage is connected to the device through input terminals (Ui 1, Ui 2) as shown in the figure. In fig. 1, two terminals of the input capacitor (3) are respectively connected with the input terminals (Ui 1, Ui 2) for filtering the high-frequency components of the network voltage and current and stabilizing the input voltage;

the utility model discloses the upper bridge arm (1) of device, its an endpoint is connected with input (Ui 1), and another endpoint is connected with output (Uo 1), and a endpoint of lower bridge arm (2) is connected with output (Uo 1), and another endpoint is connected with input (Ui 2), and this connected mode forms a bipolar step-down circuit to can realize the electric energy both-way flow;

the absorption module (4) of the device is respectively connected with the middle point of the upper bridge arm (1), the middle point of 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;

if Uo1, Uo2 are used as input and Ui1, Ui2 are used as output, the boosting function can be realized, and the bidirectional transmission of electric energy can be realized.

The utility model discloses discharge module (14) of device, its with absorption module (4) are connected for the electric quantity of storage in the absorption module (4) of releasing.

The upper bridge arm (1) and the lower bridge arm (2) of the device of the utility model respectively comprise two semiconductor switch device upper tubes (7) and lower tubes (8), upper tubes (10) and lower tubes (9) which are connected in series in the reverse direction to form two bridge arms consisting of the semiconductor switch devices, the middle points of the two bridge arms are used as the output end (UO 1) of the device, and the output inductor (6) can also be connected; the semiconductor switch device is one of power semiconductors such as reverse conducting IGBT, MOSFET, IGCT and the like. Through the utility model discloses an upper tube and low tube coordinate and carry out the PWM modulation, then can realize exchanging the function of pressure regulating and energy bidirectional transfer.

Furthermore, the upper bridge arm (1) and the lower bridge arm (2) of the device of the utility model respectively comprise two semiconductor switch device upper tubes (7) and lower tubes (8), upper tubes (10) and lower tubes (9) which are connected in series in the reverse direction, so as to form two bridge arms consisting of the semiconductor switch devices; the common drain electrode of the upper tube (7) and the common drain electrode of the lower tube (8) are connected in series, and the upper tube (10) and the common source electrode of the lower tube (9) are connected in series, or the common source electrode of the upper tube (7) and the lower tube (8) are connected in series, and the common drain electrode of the upper tube (10) and the common drain electrode of the lower tube (9) are connected in series; the semiconductor switch device is one of power semiconductors such as reverse conducting IGBT, MOSFET, IGCT and the like.

Fig. 2 is another electrical block diagram of an ac voltage regulator according to the present invention. The device comprises an input inductor (5) connected in series with the input end of a power grid and an output inductor (6) connected in series with the output end of the device, wherein the two inductors are respectively used for filtering high-frequency components of input voltage, output voltage and current and eliminating electromagnetic interference.

Fig. 3 shows an absorption module (4) of the device of the invention, comprising two diodes (11) connected in common cathode, and a diode (12), wherein the anode of the diode (11) is connected to the midpoint of the upper arm (1), and the anode of the diode (12) is connected to the input (Ui 2); the circuit also comprises a capacitor (13), one end of the capacitor is connected with the common end of the diode (11) and the diode (12), and the other end of the capacitor is connected with the midpoint of the lower bridge arm (2); when the circuit of the device generates overvoltage, the current can charge the capacitor (13) through the diode (11) or the diode (12), thereby achieving the purpose of absorbing the overvoltage.

The utility model discloses the circuit that module (14) of discharging of device includes semiconductor switch device and discharge resistance series connection, series circuit's both ends are respectively with absorb condenser (13) both ends in module (4) and be connected, when condenser both ends voltage surpassed the default, open semiconductor switch device, make the electric energy of condenser (13) storage pass through discharge resistance discharges to make electric capacity voltage maintain a settlement scope. The switch device in the discharging module (14) can be one of power semiconductors such as IGBT, MOSFET, IGCT and the like, and the resistance value and the power of the discharging resistor are calculated and set according to the voltage and the power of a specific device.

The above is only a preferred embodiment of the present invention, and it should be noted that the present invention is not limited to the above embodiment, and various changes can be made without departing from the spirit of the present invention within the knowledge scope possessed by a person skilled in the art, and the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the spirit and scope of the invention, and such modifications and enhancements are intended to be within the scope of the invention.

Claims

1. An AC voltage regulator, comprising:

2. An exchange voltage regulator, its characterized in that, it still includes:

an input inductor (5) connected in series with the input end of the power grid and used for filtering high-frequency components of the power grid current;

and the output inductor (6) is connected in series with the output end of the device and is used for filtering high-frequency components of output voltage and current.

3. The alternating current voltage regulating device according to claim 1 or 2, wherein the upper bridge arm (1) and the lower bridge arm (2) respectively comprise an upper semiconductor switching device (7) and a lower semiconductor switching device (8) which are connected in series in an opposite direction, an upper semiconductor switching device (10) and a lower semiconductor switching device (9) which form two bridge arms consisting of the semiconductor switching devices, and the middle points of the two bridge arms are connected with an output inductor (6) or used as an output end (UO 1) of the device; the semiconductor switch device is one of power semiconductors such as reverse conducting IGBT, MOSFET, IGCT and the like.

4. The alternating current voltage regulating device according to claim 1 or 2, wherein the upper bridge arm (1) and the lower bridge arm (2) respectively comprise an upper semiconductor switching device tube (7) and a lower semiconductor switching device tube (8) which are connected in series in an opposite direction, and an upper semiconductor switching device tube (10) and a lower semiconductor switching device tube (9) which form two bridge arms consisting of semiconductor switching devices; the common drain electrode of the upper tube (7) and the common drain electrode of the lower tube (8) are connected in series, and the upper tube (10) and the common source electrode of the lower tube (9) are connected in series, or the common source electrode of the upper tube (7) and the lower tube (8) are connected in series, and the common drain electrode of the upper tube (10) and the common drain electrode of the lower tube (9) are connected in series; the semiconductor switch device is one of power semiconductors such as reverse conducting IGBT, MOSFET, IGCT and the like.

5. An ac voltage regulation device according to claim 1 or 2, characterized in that the absorption module (4) comprises: the diode (11) and the diode (12) are connected with the common cathode, wherein the anode of the diode (11) is connected with the midpoint of the upper bridge arm (1), and the anode of the diode (12) is connected with the input end (Ui 2);

6. An ac voltage regulator according to claim 1 or 2, wherein the discharging module (14) comprises a circuit of a semiconductor switching device and a discharging resistor connected in series, and both ends of the series circuit are respectively connected to both ends of the capacitor (13) in the absorption module (4), when the voltage across the capacitor exceeds a preset value, the semiconductor switching device is turned on, so that the electric energy stored in the capacitor (13) is discharged through the discharging resistor, thereby maintaining the capacitor voltage within a set range.