CN211830214U - Active compensation device controlled by fundamental wave active current - Google Patents
Active compensation device controlled by fundamental wave active current Download PDFInfo
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- CN211830214U CN211830214U CN202020215425.5U CN202020215425U CN211830214U CN 211830214 U CN211830214 U CN 211830214U CN 202020215425 U CN202020215425 U CN 202020215425U CN 211830214 U CN211830214 U CN 211830214U
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- synchronous compensator
- static synchronous
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- 230000003068 static effect Effects 0.000 claims abstract description 15
- 230000001360 synchronised effect Effects 0.000 claims abstract description 14
- 239000003990 capacitor Substances 0.000 claims abstract description 13
- 230000007935 neutral effect Effects 0.000 claims abstract description 6
- 230000002457 bidirectional effect Effects 0.000 claims description 2
- 239000004065 semiconductor Substances 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 4
- 238000009826 distribution Methods 0.000 description 10
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
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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
- Y02E40/10—Flexible AC transmission systems [FACTS]
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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
- Y02E40/40—Arrangements for reducing harmonics
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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
An active compensation device controlled by fundamental wave active current comprises a static synchronous compensator, a filter reactor and a series capacitor; the input end of the static synchronous compensator is respectively connected with three phases of a three-phase four-wire system power supply through a reactor; the output end of the static synchronous compensator is connected with a capacitor; the neutral point of the direct current side capacitor is connected with the zero line of the three-phase four-wire system power supply. The utility model discloses the device compares with traditional power electronic equipment and has saved complicated harmonic and idle detection structure part and corresponding hardware circuit, and detection method calculated amount is less relatively, and dynamic tracking ability is stronger.
Description
Technical Field
The utility model relates to an active compensation arrangement of fundamental wave active current control belongs to electric wire netting technical field.
Background
In a low-voltage distribution network system, along with the diversity of industrial power utilization loads, impact reactive loads and harmonic loads are increasingly applied to industrial production, meanwhile, along with the increase of residential electricity consumption, single-phase loads are also increasingly more, so that reactive power, harmonic waves and three-phase imbalance of partial distribution areas are serious, especially, three-phase asymmetry causes the deviation of three-phase voltage neutral points of the distribution system, the outstanding problems of low user, high voltage, overlarge zero-sequence current and the like which are concerned at present are caused, the loss of circuits and transformers is increased, and the safe operation and normal use of a distribution network and electrical equipment are seriously threatened.
The active compensation device of the power distribution network can effectively compensate harmonic, reactive, negative sequence and zero sequence currents of the power grid, realizes the purification of the power grid and becomes one of effective means for solving the problem of low-voltage power distribution networks. In a power distribution network, active compensation devices with medium and small capacity are installed in certain power distribution areas with serious power quality problems, so that the power quality of a load and a public power grid connection point can be obviously improved, the power factor is improved, harmonic waves are treated, three-phase current is balanced, and the problems of high voltage, low voltage and the like are solved.
However, most of the power electronic devices are experimental research and demonstration staying in the aspects of theory or harmonic wave and reactive compensation, the effectiveness of the compensation of three-phase imbalance is not researched and verified, and meanwhile, most of the power electronic devices are applied indoors, such as APF (active power filter) and SVG (static var generator) and the like, and the requirements on temperature are high.
Disclosure of Invention
The utility model aims at solving low-voltage distribution network three-phase four-wire system at harmonic, idle, especially arouse the unbalanced electric energy quality problem of three-phase current because of unbalanced load, disclose an active compensation arrangement of fundamental wave active current control.
The technical scheme of the utility model is that the active compensation device controlled by the fundamental wave active current comprises a static synchronous compensator, a filter reactor and a series capacitor; the input end of the static synchronous compensator is respectively connected with three phases of a three-phase four-wire system power supply through a reactor; the output end of the static synchronous compensator is connected with a capacitor; the neutral point of the direct current side capacitor is connected with the zero line of the three-phase four-wire system power supply.
The fundamental active current controlled active compensation device is based on the principle that for an active compensation device, the instantaneous reactive power does not cause an energy exchange between the dc side and the ac side. If the loss of the device is not considered, the instantaneous active power of the direct current side is totally received from the active current of the fundamental wave of the direct current side, so that the energy exchange between the direct current side and the alternating current side depends on the magnitude of the instantaneous active power of the fundamental wave. When the three-phase load is unbalanced, the three-phase currents a, b and c contain positive sequence, negative sequence and zero sequence current components; zero sequence current component passes through zero line major loop and adopts the active compensation arrangement who splits the electric capacity structure, the utility model discloses the neutral point of device direct current side electric capacity links to each other with the zero line to this eliminates zero sequence current.
The beneficial effects of the utility model are that, compare with traditional power electronic equipment and saved complicated harmonic and idle detection structure part and corresponding hardware circuit, detection method calculated amount is less relatively, and dynamic tracking ability is stronger.
Drawings
Fig. 1 is a circuit diagram of the topology structure of the main loop of the active compensation device of the present invention.
Detailed Description
The specific embodiment of the present invention is shown in fig. 1.
The active compensation device for controlling the fundamental wave active current comprises a static synchronous compensator, a filter reactor and a series capacitor; the input end of the static synchronous compensator is respectively connected with three phases of a three-phase four-wire system power supply through a reactor; the output end of the static synchronous compensator is connected with a capacitor; the neutral point of the direct current side capacitor is connected with the zero line of the three-phase four-wire system power supply.
In the embodiment, the static synchronous compensator adopts an FF450R17ME4 module, and is a novel bidirectional IGBT power semiconductor device. 10000uF/450V and 750V of direct-current side voltage are adopted for electrolytic capacitors C1 and C2. The filter reactor L is 2 mH.
When three-phase loads are inconsistent, the voltage at the outlet of the transformer is easily inconsistent, so that the condition of low voltage of single-phase heavy loads occurs, the active power compensation device compensates the negative sequence, zero sequence and reactive current in the load current to realize the basic consistency of the three-phase voltages, the zero sequence current is reduced to 10.6A from the original 88.1A, the unbalance degree is reduced to 2.9% from the original 50.9%, and the requirement of 15% of the unbalance degree of the three-phase loads of the distribution transformer in the standard is met.
Claims (2)
1. An active compensation device controlled by fundamental wave active current is characterized in that the compensation device comprises a static synchronous compensator, a filter reactor and a series capacitor; the input end of the static synchronous compensator is respectively connected with three phases of a three-phase four-wire system power supply through a reactor; the output end of the static synchronous compensator is connected with a capacitor; the neutral point of the direct current side capacitor is connected with the zero line of the three-phase four-wire system power supply.
2. The active compensation device of claim 1, wherein the static synchronous compensator is a bidirectional IGBT power semiconductor device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020215425.5U CN211830214U (en) | 2020-02-27 | 2020-02-27 | Active compensation device controlled by fundamental wave active current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020215425.5U CN211830214U (en) | 2020-02-27 | 2020-02-27 | Active compensation device controlled by fundamental wave active current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211830214U true CN211830214U (en) | 2020-10-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020215425.5U Active CN211830214U (en) | 2020-02-27 | 2020-02-27 | Active compensation device controlled by fundamental wave active current |
Country Status (1)
| Country | Link |
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| CN (1) | CN211830214U (en) |
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2020
- 2020-02-27 CN CN202020215425.5U patent/CN211830214U/en active Active
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