CN213717624U

CN213717624U - Wall-mounted single-phase passive series voltage stabilizer

Info

Publication number: CN213717624U
Application number: CN202022487648.XU
Authority: CN
Inventors: 郭敏; 肖静; 黄金剑
Original assignee: Electric Power Research Institute of Guangxi Power Grid Co Ltd
Current assignee: Electric Power Research Institute of Guangxi Power Grid Co Ltd
Priority date: 2020-11-02
Filing date: 2020-11-02
Publication date: 2021-07-16
Anticipated expiration: 2030-11-02

Abstract

The utility model discloses a wall-mounted single-phase passive series voltage stabilizing device. The wall-mounted single-phase passive series voltage stabilizing device comprises: an autotransformer T, a switching module, a shifting module, a bypass module, a voltage mutual inductance transformer TV1, voltage transformer TV2, current transformer TA1 and current transformer TA2, wherein: the switching module and the shifting module are arranged on the autotransformer T in series, and the bypass module is arranged on the autotransformer T in parallel , the voltage transformer TV1 and the current transformer TA1 are arranged in series at the input end of the wall-mounted single-phase passive series voltage regulator, and the voltage transformer TV2 and the current transformer TA2 are arranged in series at the wall-mounted single-phase passive series regulator. Phase passive series voltage regulator output. The device of the embodiment of the present invention can realize the gear switching to generate the compensation voltage, and perform vector superposition with the input voltage to obtain the output voltage, and there is no problem of voltage interruption during the gear switching process of the traditional line-type voltage regulating device.

Description

Wall-mounted single-phase passive series voltage stabilizer

Technical Field

The utility model relates to the field of electric power technology, specifically be wall-hanging single-phase passive series voltage regulator device.

Background

The number of devices in the low-voltage distribution network is large, and the terminal voltage is low in the daytime and high in the nighttime due to the influence of seasonality, production and life cycles; the voltage is low when the load is heavy in holidays, and the voltage is high when the load is light in other times; the voltage is low in winter and summer and high in spring and autumn. In order to apply the above changes, the power supply office personnel often need to shift the distribution transformer, and a line voltage regulator is preferably adopted for realizing the automatic adjustment of the line transformer area.

The line voltage regulator is mainly applied to low-voltage lines in an electric power system at home and abroad, can automatically regulate the transformation ratio to ensure a device with stable output voltage, is particularly suitable for lines with large voltage fluctuation or lines with large voltage drop, is arranged in the middle of a feed line, regulates the line voltage within a certain range, ensures the supply voltage of users, and reduces the line loss of the lines. At present, the technology of line voltage regulating devices at home and abroad is widely applied to 10kV and 380V systems.

The traditional line type voltage regulating device is simple in topological structure, and as shown in fig. 1, when the device works for compensation, all power needs to pass through the autotransformer, so that the device is high in loss, serious in heating, large in volume and weight, but the device is inevitably high in volume, weight and loss due to the fact that all power passes through the autotransformer.

The power of a load group of the existing line type voltage regulating device is completely coupled and output by the autotransformer, so that the load current is completely output by the autotransformer, and the transformer needs to be designed according to the maximum load group capacity during design; in application, a double-section winding mode is usually adopted, and the number of turns of the winding is large. Therefore, the designed capacity of the transformer is very large, the volume and the weight cannot be reduced, and the iron loss and the copper loss of the transformer are correspondingly very large. The traditional autotransformer adopts a simple control mode of controlling a tap by a contactor or a composite switch, is limited by the service life of a mechanical switch, cannot be frequently switched, influences the response speed and the service life of the autotransformer, and causes the condition that the terminal voltage still has large short-time fluctuation.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the weak point of prior art, for solving traditional line type regulator have the loss of operation big, generate heat seriously, bulky weight is heavy, shift and easily appear voltage interruption, the utility model provides a wall-hanging single-phase passive series voltage regulator device produces offset voltage through the gear switching to carry out the vector stack with input voltage and obtain output voltage, do not have traditional line type regulator and easily appear voltage interruption problem in the gear switching process.

In order to achieve the above object, the utility model provides a following technical scheme:

a wall-mounted single-phase passive series regulator device, comprising: self-coupling transformer T, switching module, shifting module, bypass module, voltage transformer TV1, voltage transformer TV2, current transformer TA1 and current transformer TA2, wherein:

the switching module and the shifting module are arranged on a self-coupling transformer T in series, the bypass module is arranged on the self-coupling transformer T in parallel, the voltage transformer TV1 and the current transformer TA1 are arranged at the input end of the wall-mounted single-phase passive series voltage stabilizer in series, and the voltage transformer TV2 and the current transformer TA2 are arranged at the output end of the wall-mounted single-phase passive series voltage stabilizer in series.

The switching module comprises a plurality of switching units, and the switching units form a parallel circuit and are connected to the self-even transformer T.

Each switching unit of the plurality of switching units comprises a switch subunit S and a switch subunit K, wherein:

the switch subunit S is a mechanical switch, or a power electronic switch, or a compound switch;

the switch subunit K is a mechanical switch, or a power electronic switch, or a compound switch.

The power electronic switch is a thyristor, or a MOSFET, or an IGBT.

The gear shifting module comprises a gear shifting unit QD and a resistor R, and the gear shifting unit QD and the resistor R form a parallel circuit to be connected to the self-coupling transformer T.

The gear shifting unit QD is a thyristor, or a MOSFET, or an IGBT.

The bypass module comprises a quick bypass unit KS and a mechanical bypass unit JS, wherein the quick bypass unit KS and the mechanical bypass unit JS form a parallel circuit connected to the self-coupling transformer T.

The wall-mounted single-phase passive series voltage stabilizing device further comprises a circuit breaker QF, and the circuit breaker QF is arranged at the input end of the wall-mounted single-phase passive series voltage stabilizing device.

Compared with the prior art, the utility model provides a wall-hanging single-phase passive series voltage regulator device possesses following beneficial effect:

the wall-mounted single-phase passive series voltage stabilizing device for voltage monitoring in the embodiment of the utility model is different from the traditional line type voltage regulating device in the past, 1) the device only needs compensating power or voltage to pass through the autotransformer by utilizing the voltage vector superposition principle, so that the operation loss and the heat productivity of the device are greatly reduced; 2) the device only needs to compensate the power to pass through the autotransformer, compared with the full power to pass through, the compensation power to pass through than the full power to pass through the required autotransformer capacity reduction, thus the whole weight volume of the device is further reduced, make the device can mount on the wall; 3) when the device normally operates and is not compensated, the output voltage of the device is almost equal to the input voltage, the device generates compensation voltage through gear switching and carries out vector superposition with the input voltage to obtain the output voltage, and the problem that the traditional line type voltage regulating device is easy to have voltage interruption in the gear switching process is solved.

Drawings

FIG. 1 is a schematic circuit diagram of a prior art line-type voltage regulator;

fig. 2 is a schematic structural diagram of a wall-mounted single-phase passive series voltage regulator of the present invention;

fig. 3 is a schematic diagram of an equivalent circuit structure of a wall-mounted single-phase passive series voltage regulator in a complex frequency domain form according to the present invention;

fig. 4 is a control schematic block diagram based on wall-mounted single-phase passive series voltage stabilization in the invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Fig. 2 shows the utility model provides a wall-hanging single-phase passive series voltage regulator device schematic structure, this wall-hanging single-phase passive series voltage regulator device includes: self-coupling transformer T, switching module, shifting module, bypass module, voltage transformer TV1, voltage transformer TV2, current transformer TA1 and current transformer TA2, wherein: the switching module and the shifting module are arranged on a self-coupling transformer T in series, the bypass module is arranged on the self-coupling transformer T in parallel, the voltage transformer TV1 and the current transformer TA1 are arranged at the input end of the wall-mounted single-phase passive series voltage stabilizer in series, and the voltage transformer TV2 and the current transformer TA2 are arranged at the output end of the wall-mounted single-phase passive series voltage stabilizer in series. The switching module comprises a plurality of switching units, and the switching units form a parallel circuit and are connected to the self-even transformer T.

Each switching unit of the plurality of switching units comprises a switch subunit S and a switch subunit K, wherein: the switch subunit S is a mechanical switch, or a power electronic switch, or a compound switch; the switch subunit K is a mechanical switch, or a power electronic switch, or a compound switch. The power electronic switch is a thyristor, or a MOSFET, or an IGBT.

The gear shifting module comprises a gear shifting unit QD and a resistor R, and the gear shifting unit QD and the resistor R form a parallel circuit to be connected to the self-coupling transformer T. The gear shifting unit QD is a thyristor, or a MOSFET, or an IGBT. The bypass module comprises a quick bypass unit KS and a mechanical bypass unit JS, wherein the quick bypass unit KS and the mechanical bypass unit JS form a parallel circuit connected to the self-coupling transformer T. The wall-mounted single-phase passive series voltage stabilizing device further comprises a circuit breaker QF, and the circuit breaker QF is arranged at the input end of the wall-mounted single-phase passive series voltage stabilizing device.

Specifically, the wall-mounted single-phase passive series voltage stabilizing device comprises an autotransformer T, switching units S1, S2.. Sn, K1 and K2... Kn, a shifting unit QD, a resistor R, bypass units (a quick bypass unit KS and a mechanical bypass unit JS), a breaker QF, voltage transformers TV1 and TV2 and current transformers TA1 and TA 2. As for the S1, S2.. Sn, K1, K2... Kn, QD, and KS selection types, comprehensive consideration can be given in terms of performance and production cost, and the design unit can be selected from a mechanical switch, a power electronic switch, and a composite switch (a composite of a power electronic switch and a mechanical switch), and the power electronic switch can be selected from a thyristor, a MOSFET, an IGBT, and the like. The number of the gears of the autotransformer can be specifically designed according to the actual application requirement.

Based on the wall-mounted single-phase passive series voltage stabilizing device with the voltage monitoring shown in fig. 2, which is different from the traditional line type voltage regulating device, 1) the device only needs to compensate power or voltage to pass through an autotransformer by using a voltage vector superposition principle, so that the operation loss and the heat productivity of the device are greatly reduced; 2) the device only needs to compensate the power to pass through the autotransformer, compared with the full power to pass through, the compensation power to pass through than the full power to pass through the required autotransformer capacity reduction, thus the whole weight volume of the device is further reduced, make the device can mount on the wall; 3) when the device normally operates and is not compensated, the output voltage of the device is almost equal to the input voltage, compensation voltage is generated through gear switching, vector superposition is carried out on the compensation voltage and the input voltage to obtain output voltage, and the problem that the traditional line type voltage regulating device is easy to have voltage interruption in the gear switching process is solved.

Wall-mounted single-phase passive series voltage stabilizing device based on fig. 2, and equivalent circuit structure thereof in complex frequency domain formIt is intended that as shown in FIG. 3, U_iIs the input terminal voltage, U_oIs the output terminal voltage, U₁And U₂Respectively representing the input and output voltages, U, of the autotransformer₁₀And U₂₀Respectively representing the excitation voltages of the primary and secondary sides of the autotransformer, R₁And R₂Respectively representing the resistances of the primary and secondary windings of the autotransformer, L₁And L₂Respectively representing leakage inductance of primary and secondary windings of the autotransformer, n is the transformation ratio of the autotransformer, R_mAnd L_mRepresenting the excitation resistance and the excitation inductance of the transformer core, respectively, and δ is expressed as a function of the bypass switch.

In FIG. 3, the network equation is shown as

The formula (2) and (1) can be used for obtaining:

U₂₀(s)＝U₁₀(s)/n (3)

U₂(s)＝(R₂+sL₂)I₂(s)+U₂₀(s) (4)

substituting formula (3) for formula (4) to obtain:

U₂(s)＝(R₂+sL₂)I₂(s)+U₁₀(s)/n (5)

to satisfy the formula (2) in the equivalent circuit

I₂(s)＝-n*I₁(s) (6)

Further obtained by substituting formula (6) for formula (5):

nU₂(s)＝-n²(R₂+sL₂)I₁(s)+U₁₀(s) (7)

is modified by the formula (1)

U₁(s)＝(R₁+sL₁)I₁(s)+U₁₀(s) (8)

Elimination of U from formulae (7) and (8)₁₀(s) obtaining

In order to conveniently control the device in engineering, copper loss of the autotransformer is further ignored, the formula (9) can be changed into the formula (10), and the output voltage and the input voltage form a linear relation

U₂(s)≈U₁(s)/n (10)

Obtaining the output voltage of the device as a function of the bypass switch according to the voltage vector superposition principle

U₀(s)＝U_i(s)+δ(U₂(s)，0)＝U_i(s)+δ(U₁(s)/n，0) (10)

The control principle analysis of the wall-mounted single-phase passive series regulator device with voltage monitoring is performed according to the formula (10), and the following explanation of the control mode is based on the effective voltage value of the input power supply.

Based on the equivalent schematic diagram shown in fig. 3, fig. 4 shows the control schematic diagram of the wall-mounted single-phase passive series voltage stabilizer of the present invention, which is specifically as follows:

(1) when the bypass switch is closed, that is, the output δ (-) of the bypass switch is zero, the device output voltage is the input voltage, and simultaneously, S1, S2.. Sn, K1, K2... Kn, and QD need to be turned off, so that the output side of the autotransformer is prevented from being short-circuited to burn the whole device, as shown in the mode 1 in fig. 4.

(2) The bypass switch is turned off, i.e. the output delta (-) of the bypass switch is U₁(s)/n, the device output voltage being a vector superposition of the input voltage and the autotransformer output voltage. The low voltage and the high voltage can be controlled by controlling the change of the homonymous end of the autotransformer under the same transformation ratio n, and the input voltage is U when K1 and S2 are closed as shown in figure 1₁Low voltage remediation can be achieved, as shown in mode 2 of fig. 4; that when S1 and K2 are closed, the input voltage is-U₁And can realize high voltage treatment, such as the die shown in FIG. 4And (3) formula. That low or high voltage abatement capability may be controlled by different transformation ratios n, e.g. 1 and 2 being one n ₁₂1 and 3 are n₁₃2 and 3 are n₂₃。

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. a wall-mounted single-phase passive series voltage stabilizer, is characterized in that, described wall-mounted single-phase passive series voltage stabilizer comprises: autotransformer T, switching module, shifting module, bypass module, voltage Transformer TV1, Voltage Transformer TV2, Current Transformer TA1 and Current Transformer TA2, of which:

The switching module and the shifting module are arranged in series on the auto-transformer T, the bypass module is arranged in parallel on the auto-transformer T, and the voltage transformer TV1 and the current transformer TA1 are arranged in series on the wall-mounted unit. The input end of the phase passive series voltage stabilizer, the voltage transformer TV2 and the current transformer TA2 are arranged in series at the output end of the wall-mounted single-phase passive series voltage stabilizer.

2 . The wall-mounted single-phase passive series voltage regulator according to claim 1 , wherein the switching module comprises several switching units, and the several switching units form a parallel circuit and are connected to the autotransformer T 2 . superior.

3. The wall-mounted single-phase passive series voltage regulator according to claim 2, wherein each switching unit in the plurality of switching units comprises a switching subunit S and a switching subunit K, wherein:

The switch subunit S is a mechanical switch, or a power electronic switch, or a composite switch;

The switch subunit K is a mechanical switch, or a power electronic switch, or a composite switch.

4 . The wall-mounted single-phase passive series voltage regulator according to claim 3 , wherein the power electronic switch is a thyristor, or a MOSFET, or an IGBT. 5 .

5 . The wall-mounted single-phase passive series voltage regulator according to claim 1 , wherein the shift module comprises a shift unit QD and a resistor R, and the shift unit QD and the resistor R form The parallel circuit is connected to the autotransformer T.

6 . The wall-mounted single-phase passive series voltage regulator according to claim 5 , wherein the shifting unit QD is a thyristor, or a MOSFET or an IGBT. 7 .

7. The wall-mounted single-phase passive series voltage regulator according to claim 1, wherein the bypass module comprises a fast bypass unit KS and a mechanical bypass unit JS, and the fast bypass unit KS and The mechanical bypass unit JS forms a parallel circuit and is connected to the autotransformer T.

8. The wall-mounted single-phase passive series voltage stabilizer according to any one of claims 1 to 7, wherein the wall-mounted single-phase passive series voltage stabilizer further comprises a circuit breaker QF, and the circuit breaker The device QF is arranged at the input end of the wall-mounted single-phase passive series voltage regulator.