CN114243733A - Three-phase voltage unbalance treatment device and method based on voltage dynamic compensation - Google Patents
Three-phase voltage unbalance treatment device and method based on voltage dynamic compensation Download PDFInfo
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- CN114243733A CN114243733A CN202111490200.6A CN202111490200A CN114243733A CN 114243733 A CN114243733 A CN 114243733A CN 202111490200 A CN202111490200 A CN 202111490200A CN 114243733 A CN114243733 A CN 114243733A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The invention relates to a three-phase voltage unbalance treatment device and method 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 intelligent control device of 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. According to the invention, an additional current transformer is not required to be installed, the problem of dynamic unbalance of three-phase voltages at the installation point of the tail end of a circuit in the current power distribution network can be solved, the three-phase voltage of the installation point of the device is dynamically adjusted under the condition of no power outage, and the reliable operation of a load is ensured.
Description
Technical Field
The invention relates to a three-phase voltage unbalance treatment device and method 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 invention aims to solve the problem of unbalance of tail end three-phase voltage in a current power distribution network, improve the voltage qualification rate of a power distribution network tail end user, and provide a three-phase voltage unbalance management device and method based on voltage dynamic compensation.
In order to achieve the purpose, the technical scheme of the invention is as follows: the utility model provides a device is administered to unbalanced three-phase voltage based on voltage dynamic compensation installs on the three-phase four-wire system circuit of distribution network, gathers distribution network operation information, calculates the unbalanced degree of three-phase voltage, opens at random to circuit monophase load and causes the terminal unbalanced three-phase voltage of circuit to carry out dynamic voltage balance compensation, and the 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.
In an embodiment of the present invention, the a-phase bridge arm, the B-phase bridge arm, and the C-phase bridge arm are each formed by connecting two IGBT tubes in series, and a connection point of the two IGBT tubes is connected to 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, 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 on/off of the IGBT.
The invention also provides a three-phase unbalance treatment method based on voltage dynamic compensation, which comprises the following steps:
s1, detecting the voltage information of the three phases of A phase, B phase and C phase,
and S2, if the processor judges that the voltage difference of the three phases exceeds the preset value, the processor judges that the three phases are 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.
In an embodiment of the present invention, the method is based on any one of the above-mentioned apparatuses, and can effectively perform unbalanced current compensation; 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.
Compared with the prior art, the invention has the following beneficial effects: the three-phase voltage unbalance treatment device based on voltage dynamic compensation can effectively compensate unbalanced current and realize three-phase voltage balance of a 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 invention can solve the problem of unbalanced three-phase voltage of the terminal load in the current power distribution network, improve the voltage qualification rate of the terminal users of the power distribution network and avoid the low voltage of the terminal users.
Drawings
Fig. 1 is a schematic diagram of a three-phase voltage unbalance treatment device based on voltage dynamic compensation according to the present invention.
Fig. 2 is a schematic diagram of an embodiment of the present invention.
Fig. 3 is a control block diagram of an embodiment of the invention.
Detailed Description
The technical scheme of the invention is specifically explained below with reference to the accompanying drawings.
The invention relates to a three-phase voltage unbalance management device based on voltage dynamic compensation, which is arranged on a three-phase four-wire system circuit of a power distribution network, collects the operation information of the power distribution network, calculates the unbalance degree of the three-phase voltage, randomly starts a single-phase load of the circuit to cause the unbalance of the three-phase voltage at the tail end of the circuit to carry out dynamic voltage balance compensation, and the three-phase four-wire system circuit is respectively an A phase, a B phase, a C phase and an N phase, and the device comprises:
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 invention also provides a three-phase voltage unbalance treatment method based on voltage dynamic compensation, which comprises the following steps:
s1, detecting the voltage information of the three phases of A phase, B phase and C phase,
and S2, if the processor judges that the voltage difference of the three phases exceeds the preset value, the processor judges that the three phases are 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 following is a specific implementation process of the present invention.
As shown in fig. 1, the three-phase voltage unbalance management device based on voltage dynamic compensation of the present invention is installed on a three-phase four-wire system line of a power distribution network, collects power distribution network operation information, calculates a three-phase voltage unbalance degree, performs dynamic voltage balance compensation on a line end three-phase voltage unbalance caused by randomly starting a line single-phase load, and the three-phase four-wire system line is an a-phase line, a B-phase line, a C-phase line and an N-phase line, and 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 working principle of the device of the invention is explained as follows:
the device detects voltage information of an A phase, a B phase and a C phase (hereinafter referred to as three phases) through voltage sampling, 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 intelligently controls A, B, C three-phase bridge arms which are connected to the grid to carry out energy transfer, so that the purpose of regulating the voltage is achieved. 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 variation on the compensated line is
The voltage change on the compensated load is
Wherein
After compensation, the current variation of the equipment is
Thus, 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.
The control block diagram 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.
The above are preferred embodiments of the present invention, and all changes made according to the technical scheme of the present invention that produce functional effects do not exceed the scope of the technical scheme of the present invention belong to the protection scope of the present invention.
Claims (6)
1. The utility model provides a device is administered to unbalanced three-phase voltage based on voltage dynamic compensation, its characterized in that installs on the three-phase four-wire system circuit of distribution network, gathers distribution network operation information, calculates the unbalanced three-phase voltage degree, opens at random to circuit monophase load and causes the terminal unbalanced three-phase voltage of circuit to carry out dynamic voltage balance compensation, and the 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.
5. A three-phase voltage unbalance treatment method based on voltage dynamic compensation is characterized by comprising the following steps:
s1, detecting the voltage information of the three phases of A phase, B phase and C phase,
and S2, if the processor judges that the voltage difference of the three phases exceeds the preset value, the processor judges that the three phases are 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.
6. The three-phase voltage unbalance treatment method based on voltage dynamic compensation according to claim 5, characterized in that the method is based on the device of any one of claims 1-4, and can effectively compensate the unbalance current; 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.
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| CN202111490200.6A CN114243733A (en) | 2021-12-08 | 2021-12-08 | Three-phase voltage unbalance treatment device and method based on voltage dynamic compensation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104362655A (en) * | 2014-12-10 | 2015-02-18 | 国家电网公司 | Unbalanced load compensation device and compensation method |
| CN104779620A (en) * | 2015-03-23 | 2015-07-15 | 国家电网公司 | Voltage control device of power distribution network |
| CN106385041A (en) * | 2016-11-09 | 2017-02-08 | 株洲变流技术国家工程研究中心有限公司 | Three-grade low-voltage power distribution network voltage control device and control method thereof |
| CN206878474U (en) * | 2017-05-27 | 2018-01-12 | 浙江中新电力发展集团有限公司萧山科技分公司 | The uneven regulation terminal of 400V power distribution networks threephase load |
| CN209823429U (en) * | 2018-07-24 | 2019-12-20 | 国网青海省电力公司黄化供电公司 | Three-phase unbalance compensation device |
| CN110797887A (en) * | 2019-09-23 | 2020-02-14 | 南京软核科技有限公司 | Low-voltage transformer area three-phase unbalance management self-decision control method |
| CN216851304U (en) * | 2021-12-08 | 2022-06-28 | 国网福建省电力有限公司晋江市供电公司 | Unbalanced three-phase voltage treatment device based on voltage dynamic compensation |
-
2021
- 2021-12-08 CN CN202111490200.6A patent/CN114243733A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104362655A (en) * | 2014-12-10 | 2015-02-18 | 国家电网公司 | Unbalanced load compensation device and compensation method |
| CN104779620A (en) * | 2015-03-23 | 2015-07-15 | 国家电网公司 | Voltage control device of power distribution network |
| CN106385041A (en) * | 2016-11-09 | 2017-02-08 | 株洲变流技术国家工程研究中心有限公司 | Three-grade low-voltage power distribution network voltage control device and control method thereof |
| CN206878474U (en) * | 2017-05-27 | 2018-01-12 | 浙江中新电力发展集团有限公司萧山科技分公司 | The uneven regulation terminal of 400V power distribution networks threephase load |
| CN209823429U (en) * | 2018-07-24 | 2019-12-20 | 国网青海省电力公司黄化供电公司 | Three-phase unbalance compensation device |
| CN110797887A (en) * | 2019-09-23 | 2020-02-14 | 南京软核科技有限公司 | Low-voltage transformer area three-phase unbalance management self-decision control method |
| CN216851304U (en) * | 2021-12-08 | 2022-06-28 | 国网福建省电力有限公司晋江市供电公司 | Unbalanced three-phase voltage treatment device based on voltage dynamic compensation |
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