CN216851304U - Unbalanced three-phase voltage treatment device based on voltage dynamic compensation - Google Patents
Unbalanced three-phase voltage treatment device based on voltage dynamic compensation Download PDFInfo
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Abstract
The utility model relates to an unbalanced three-phase voltage administers device based on voltage dynamic compensation. By detecting the voltage information of the three phases of the A phase, the B phase and the C phase, the processor judges that the voltage difference of the three phases exceeds a preset value, the three-phase voltage is judged to be unbalanced, and the processor performs current phase-to-phase transfer according to the unbalanced voltage condition to achieve the voltage balance target of the tail end mounting point. The utility model discloses need not additionally to install current transformer, can solve the dynamic unbalanced problem of terminal mounting point three-phase voltage of circuit among the current distribution network, the three-phase voltage of dynamic adjustment device settlement point under the uninterrupted power condition ensures load reliable operation.
Description
Technical Field
The utility model relates to an unbalanced three-phase voltage administers device based on voltage dynamic compensation.
Background
Three-phase unbalance is a ubiquitous phenomenon in a power distribution network, and a low-voltage power grid system has more single-phase power consumption and different load current and power consumption time, so that the problem of three-phase unbalance is easily caused in a low-voltage distribution area.
The loss of the transformer and the line is increased due to the unbalanced three phases of the power supply area, the output of the transformer is reduced, and the electric energy conversion efficiency is reduced; the three-phase voltage deviation of the user side is large, and the voltage quality cannot be guaranteed; and the problem of low voltage at the tail end is caused, and in severe cases, the electric equipment can be damaged.
Therefore, how to solve the problem of unbalanced three-phase power in the current power distribution network is still a problem to be solved urgently in the industry at present.
Disclosure of Invention
The utility model aims to solve the unbalanced problem of three-phase electricity in the current distribution network, improve distribution network end user's voltage qualification rate, provide an unbalanced three-phase voltage administers device based on voltage dynamic compensation.
In order to achieve the above purpose, the technical scheme of the utility model is that: the utility model provides an unbalanced three-phase voltage administers device based on voltage dynamic compensation installs on the three-phase four-wire system circuit of distribution network for realize the terminal three-phase voltage dynamic balance of circuit, three-phase four-wire system circuit be A looks, B looks, C looks and N line respectively, the device includes:
the device comprises a processor, a driving circuit, a PFC inductor, a change-over switch, an A alternating current voltage measuring circuit, a B alternating current voltage measuring circuit and a C alternating current voltage measuring circuit; the change-over switch comprises an A-phase bridge arm, a B-phase bridge arm, a C-phase bridge arm and an N-line circuit which are connected in parallel;
the A-phase alternating current voltage measuring circuit, the B-phase alternating current voltage measuring circuit and the C-phase alternating current voltage measuring circuit are connected to the power distribution network and used for detecting voltage information of an A phase, a B phase and a C phase;
the A-phase alternating current voltage measuring circuit, the B-phase alternating current voltage measuring circuit and the C-phase alternating current voltage measuring circuit are in communication connection with the processor and used for respectively transmitting voltage information of the A phase, the B phase and the C phase to the processor;
the phase A forms a loop through an A-phase alternating current voltage measuring circuit, a PFC inductor, a C-phase bridge arm, an N-line circuit and an N-line;
the phase B forms a loop through a phase B alternating current voltage measuring circuit, a PFC inductor, a phase B bridge arm, an N-line circuit and an N-line;
the C phase forms a loop through a C-phase alternating current voltage measuring circuit, a PFC inductor, an A-phase bridge arm, an N-line circuit and an N-line;
the processor is connected with the selector switch through the driving circuit.
The utility model discloses an in the embodiment, A looks bridge arm, B looks bridge arm, C looks bridge arm constitute by two IGBT pipe series connection, and two IGBT pipe tie points are connected with A alternating voltage measuring circuit, B alternating voltage measuring circuit, C alternating voltage measuring circuit respectively.
In an embodiment of the present invention, the N-line circuit includes two capacitors connected in series, and a connection point of the two capacitors is connected to the N-line.
In an embodiment of the present invention, the processor is respectively connected to the a-phase bridge arm, the B-phase bridge arm, and the C-phase bridge arm of the switch through the driving circuit to control the switching of the IGBT.
Compared with the prior art, the utility model discloses following beneficial effect has: the utility model discloses unbalanced three-phase voltage treatment device based on voltage dynamic compensation can effectively carry out unbalanced current compensation, realizes the three-phase voltage balance of the device mounting point; the current transformer does not need to be additionally installed for analyzing the three-phase current of the load, so that the installation workload of the equipment is greatly reduced, and the overall investment cost of the equipment is saved. And the equipment is connected in parallel to a network, so that the equipment can be installed without power failure, and the treatment cost is saved. The utility model discloses can solve the unbalanced problem of terminal load three-phase voltage in the current distribution network, improve distribution network end user's voltage qualification rate, avoid end user low-voltage.
Drawings
Fig. 1 is the utility model relates to an unbalanced three-phase voltage administers device principle sketch map based on voltage dynamic compensation.
Fig. 2 is a schematic diagram of an embodiment of the present invention.
Fig. 3 is a control block diagram according to an embodiment of the present invention.
Detailed Description
The technical solution of the present invention is specifically explained below with reference to the accompanying drawings.
As shown in fig. 1, the utility model relates to an unbalanced three-phase voltage administers device based on voltage dynamic compensation installs on the three-phase four-wire system circuit of distribution network for realize the terminal three-phase voltage dynamic balance of circuit, three-phase four-wire system circuit be A looks, B looks, C looks and N line respectively, the device includes:
the device comprises a processor, a driving circuit, a PFC inductor, a change-over switch, an A alternating current voltage measuring circuit, a B alternating current voltage measuring circuit and a C alternating current voltage measuring circuit; the change-over switch comprises an A-phase bridge arm, a B-phase bridge arm, a C-phase bridge arm and an N-line circuit which are connected in parallel;
the A-phase alternating current voltage measuring circuit, the B-phase alternating current voltage measuring circuit and the C-phase alternating current voltage measuring circuit are connected to the power distribution network and used for detecting voltage information of an A phase, a B phase and a C phase;
the A-phase alternating current voltage measuring circuit, the B-phase alternating current voltage measuring circuit and the C-phase alternating current voltage measuring circuit are in communication connection with the processor and used for respectively transmitting voltage information of the A phase, the B phase and the C phase to the processor;
the phase A forms a loop through an A-phase alternating current voltage measuring circuit, a PFC inductor, a C-phase bridge arm, an N-line circuit and an N-line;
the phase B forms a loop through a phase B alternating current voltage measuring circuit, a PFC inductor, a phase B bridge arm, an N-line circuit and an N-line;
the C phase forms a loop through a C-phase alternating current voltage measuring circuit, a PFC inductor, an A-phase bridge arm, an N-line circuit and an N-line;
the processor is connected with the selector switch through the driving circuit.
The bridge arm of the A phase, the bridge arm of the B phase and the bridge arm of the C phase are formed by connecting two IGBT tubes in series, and connecting points of the two IGBT tubes are respectively connected with the alternating current voltage measuring circuit of the A phase, the alternating current voltage measuring circuit of the B phase and the alternating current voltage measuring circuit of the C phase. The N-line circuit comprises two capacitors connected in series, and the connecting point of the two capacitors is connected with the N line. The processor is respectively connected with the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm of the change-over switch through the driving circuit so as to control the opening and closing of the IGBT tube.
The utility model discloses the device theory of operation explains as follows:
the utility model discloses the device passes through the voltage information of voltage sampling detection A looks, B looks and C looks (hereinafter for short the three-phase), and the treater judges that the three-phase voltage difference exceeds the default, then judges for three-phase voltage unbalance, then carries out energy transfer between the A, B, C three-phase bridge arms that treater intelligent control is incorporated into the power networks, reaches regulating voltage's purpose. Consider the load as a constant impedance load and the line impedance as shown in fig. 2
Load impedance
For a heavy-load phase, the voltage change on the compensated line is
The voltage change on the compensated load is
Wherein
After compensation, the current of the device changes by the amount of
Therefore, there are:
further, it is possible to prevent the occurrence of,
because the right side of the formula is larger than 0, the variation of the compensated heavy-load phase voltage is larger than 0, and therefore the three-phase unbalance treatment equipment has a certain lifting effect on the voltage of the heavy-load phase.
An example control block diagram of the present invention is shown in fig. 3. And comparing the detected value of the three-phase voltage of the power grid with a target set value, and generating a current value to be compensated through PI control.
For example: when the three-phase voltage is unbalanced, the phase voltage A is larger than the phase voltage B and is larger than the phase voltage C, the voltage of the original phase C is lower due to overweight of the load, and when the processor judges that the three-phase voltage is unbalanced, the processor extracts current from the phase A to compensate the phase C, so that the current of a phase C line is reduced to achieve the aim of lifting the phase voltage C, the three-phase voltage balance is finally realized, and the problem of the condition that a certain phase voltage is too low due to unbalanced three-phase load is solved.
Above is the utility model discloses a preferred embodiment, all rely on the utility model discloses the change that technical scheme made, produced functional action does not surpass the utility model discloses during technical scheme's scope, all belong to the utility model discloses a protection scope.
Claims (4)
1. The utility model provides a three-phase voltage unbalance management device based on voltage dynamic compensation which characterized in that installs on the three-phase four-wire system circuit of distribution network for realize the terminal three-phase voltage dynamic balance of circuit, three-phase four-wire system circuit is A looks, B looks, C looks and N line respectively, the device includes:
the device comprises a processor, a driving circuit, a PFC inductor, a change-over switch, an A alternating current voltage measuring circuit, a B alternating current voltage measuring circuit and a C alternating current voltage measuring circuit; the change-over switch comprises an A-phase bridge arm, a B-phase bridge arm, a C-phase bridge arm and an N-line circuit which are connected in parallel;
the A-phase alternating current voltage measuring circuit, the B-phase alternating current voltage measuring circuit and the C-phase alternating current voltage measuring circuit are connected to the power distribution network and used for detecting voltage information of an A phase, a B phase and a C phase;
the A-phase alternating current voltage measuring circuit, the B-phase alternating current voltage measuring circuit and the C-phase alternating current voltage measuring circuit are in communication connection with the processor and used for respectively transmitting voltage information of the A phase, the B phase and the C phase to the processor;
the phase A forms a loop through an A-phase alternating current voltage measuring circuit, a PFC inductor, a C-phase bridge arm, an N-line circuit and an N-line;
the phase B forms a loop through a phase B alternating current voltage measuring circuit, a PFC inductor, a phase B bridge arm, an N-line circuit and an N-line;
the C phase forms a loop through a C-phase alternating current voltage measuring circuit, a PFC inductor, an A-phase bridge arm, an N-line circuit and an N-line;
the processor is connected with the selector switch through the driving circuit.
2. The three-phase voltage unbalance treatment device based on voltage dynamic compensation according to claim 1, wherein the a-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm are formed by connecting two IGBT tubes in series, and the two IGBT tube connection points are respectively connected with the a-phase alternating voltage measurement circuit, the B-phase alternating voltage measurement circuit and the C-phase alternating voltage measurement circuit.
3. The three-phase voltage unbalance treatment device based on voltage dynamic compensation of claim 1, wherein the N-line circuit comprises two capacitors connected in series, and a connection point of the two capacitors is connected with the N-line.
4. The three-phase voltage unbalance treatment device based on voltage dynamic compensation of claim 1, wherein the processor is respectively connected with an A-phase bridge arm, a B-phase bridge arm and a C-phase bridge arm of the switch through a driving circuit to control the opening and closing of the IGBT tube.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123064919.1U CN216851304U (en) | 2021-12-08 | 2021-12-08 | Unbalanced three-phase voltage treatment device based on voltage dynamic compensation |
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| CN202123064919.1U CN216851304U (en) | 2021-12-08 | 2021-12-08 | Unbalanced three-phase voltage treatment device based on voltage dynamic compensation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114243733A (en) * | 2021-12-08 | 2022-03-25 | 国网福建省电力有限公司晋江市供电公司 | Three-phase voltage unbalance treatment device and method based on voltage dynamic compensation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114243733A (en) * | 2021-12-08 | 2022-03-25 | 国网福建省电力有限公司晋江市供电公司 | Three-phase voltage unbalance treatment device and method based on voltage dynamic compensation |
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