CN205724912U - A kind of rural power grids low-voltage controlling device - Google Patents
A kind of rural power grids low-voltage controlling device Download PDFInfo
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- CN205724912U CN205724912U CN201620330418.3U CN201620330418U CN205724912U CN 205724912 U CN205724912 U CN 205724912U CN 201620330418 U CN201620330418 U CN 201620330418U CN 205724912 U CN205724912 U CN 205724912U
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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
- Y02E40/30—Reactive power compensation
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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
A kind of rural power grids low-voltage controlling device, including dynamic reactive compensation device and dynamic voltage adjustment device, the AC of described dynamic reactive compensation device is connected on the output bus of distribution transformer, DC side connects storage capacitor, described storage capacitor is also as the DC side energy storage link of dynamic voltage adjustment device, DC voltage is converted to adjustable alternating voltage by the inverter bridge of described dynamic voltage adjustment device, and voltage scale is superimposed upon on the output bus of distribution transformer by series transformer.Device of the present utility model just provides different supply voltages for near-end, remote subscriber, dynamically regulates supply voltage according to the change of far-end load current simultaneously, makes remote subscriber voltage stable as far as possible within the scope of standard limits.
Description
Technical field
This utility model low-voltage distribution field, particularly relates to the device that the low-voltage distribution occasion low-voltage of rural power grids is administered.
Background technology
There is user distribution extensively in the rural power grids of China at present, and load, circuit is long, the feature that line loss is big, and the peak interval of time difference of load, seasonal variation are clearly.Such as between daytime, rural power load is the most on the low side, near zero load；During night 18:00-21:00, load is the most heavier, near at full capacity.During slack season, rural power load is on the low side；During busy farming season and the Spring Festival, load is abnormal higher again.This peak valley difference causes the user away from distribution transformer at peak of power consumption period low voltage.Raise the output voltage of transformator for solving this problem, near-end user voltage can be caused again higher, and in load relatively low period, the voltage of all users is the most higher, affects safety and the service life of user side electrical equipment.
Traditional means administering rural power grids low-voltage problem are to use load ratio bridging switch, weight according to load is switched on different transformer tappings, change output voltage, but rural power grids user disperses, simple regulation transformer output voltage, far and near different user is produced different regulating effects, it is difficult to due attention to both short and long-range targets.Or employing reactive power compensator, increases the composition of capacitive reactive power, makes transformer voltage lifting when low voltage, and effect is similar with load ratio bridging switch, it is also difficult to take into account far and near different user；Moreover the low voltage of rural power grids medium and long distance user is substantially the pressure drop that load current causes on long cables, and wherein the component of watt current is heavier, so simple idle being also difficult to of mending receives satisfied effect.And on a large scale the circuit of rural power grids is transformed, increase number transformer and capacity, increase the cross-section of cable, although can obtain preferable effect, but invest huge, and the power consumption of rural power grids itself is the most limited, income of electricity charge is the highest, the most uneconomical.
Therefore, it is badly in need of the device that a kind of distribution occasion low-voltage is administered at present, solves power load distributing in rural power grids uneven, the problem of three-phase imbalance.
Utility model content
The purpose of this utility model is to provide a kind of rural power grids low-voltage controlling device, according to idle in the electric current of user side, harmonic wave, unbalanced degree, compensates dynamically so that transformer output voltage is more stable.
For realizing above-mentioned utility model purpose, the technical scheme that this utility model provides is:
A kind of rural power grids low-voltage controlling device, including dynamic reactive compensation device and dynamic voltage adjustment device, the AC of described dynamic reactive compensation device is connected on the output bus of distribution transformer, DC side connects storage capacitor, described storage capacitor is also as the DC side energy storage link of dynamic voltage adjustment device, DC voltage is converted to adjustable alternating voltage by the inverter bridge of described dynamic voltage adjustment device, and voltage scale is superimposed upon on the output bus of distribution transformer by series transformer；
The branch cable of near-end user is connected to the outfan of distribution power transformation device, and the branch cable of remote subscriber is connected to the outfan of series transformer.
Further, the three-phase IGBT bridge that described dynamic reactive compensation device is made up of 6 insulated gate bipolar transistor IGBTs, AC is connected on the output bus of distribution transformer by 3 reactors, DC side is DC capacitor, the three-phase bridge that described dynamic voltage adjustment device is made up of 6 insulated gate bipolar transistor IGBTs forms, output is connected on series transformer by 3 filter reactors, load current according to remote subscriber, dynamically regulate the SPWM waveform of described dynamic voltage adjustment device audion, export the voltage of series transformer for compensating the pressure drop of loss on the cable of remote subscriber.
Further, according to three-phase imbalance composition, idle composition, the size of harmonic components in the total load electric current detected, control the SPWM waveform of described dynamic reactive compensation device three-phase bridge so that the current waveform injected on distribution transformer output bus by reactor can compensate for three-phase imbalance, idle composition, harmonic components.
Further, described dynamic reactive compensation device is made up of the capacitor of thyristor throw-cut, 6 diodes constitute uncontrollable rectifier bridge and produce DC voltage, connect DC capacitor, the three-phase bridge that described dynamic voltage adjustment device is made up of 6 IGBT forms, output is connected on series transformer by 3 filter reactors, load current according to remote subscriber, dynamically regulate the SPWM waveform of described dynamic voltage adjustment device audion, export the voltage of series transformer for compensating the pressure drop of loss on the cable of remote subscriber.
Further, described dynamic reactive compensation device is made up of the three-phase bridge of three-level structure, each brachium pontis is made up of 4 IGBT and 2 diodes, AC is connected on the output bus of distribution transformer by reactor, DC side is DC capacitor, the three-phase bridge that described dynamic voltage adjustment device is made up of 6 IGBT forms, output is connected on series transformer by 3 filter reactors, load current according to remote subscriber, dynamically regulate the SPWM waveform of described dynamic voltage adjustment device audion, export the voltage of series transformer for compensating the pressure drop of loss on the cable of remote subscriber.
Further, it is made up of parallel three single phase device, the IGBT bridge that dynamic reactive compensation device described in each single phase device is constituted H bridge by 4 audions forms, AC is connected to injecting compensating electric current on the output bus of distribution transformer by reactor, DC side is DC capacitor, described dynamic voltage adjustment device is made up of H bridge and is connected on series transformer by filter reactor as IGBT bridge, output 4 audions.
Using technique scheme, this utility model has the advantages that
First, device of the present utility model is that near-end, remote subscriber provide different supply voltages, dynamically regulates supply voltage according to the change of far-end load current simultaneously, when load is heavier, raises the output voltage of series transformer, the pressure drop on compensated line；Otherwise then reduce the output voltage of series transformer, make remote subscriber voltage stable as far as possible within the scope of standard limits.
Second, device of the present utility model can be according to idle in the electric current of user side, harmonic wave, unbalanced degree, compensate dynamically, make transformer output voltage more stable, neutral line current maintains reduced levels as far as possible, and it is unlikely to produce bigger pressure drop, the problem improving low-voltage further.
3rd, this utility model Capacity design the least when the design of pressure regulation part, even if rectifier bridge can produce certain harmonic wave in running, the deterioration of total harmonic wave is the most inconspicuous, can reduce complexity and the cost of system simultaneously.
Accompanying drawing explanation
Fig. 1 is the structural representation in the first preferred embodiment；
Fig. 2 is the structural representation in the second preferred embodiment；
Fig. 3 is the structural representation in third preferred embodiment；
Fig. 4 is the structural representation in the 4th preferred embodiment；
In figure, the implication of each reference is as follows:
T1 represents that distribution transformer, T2 represent that series transformer, L represent that filter reactance, Q represent that audion, D represent that diode, C represent electric capacity.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with the accompanying drawings and embodiment, this utility model is further elaborated.Should be appreciated that structure chart described herein and specific embodiment, only in order to explain this utility model, are not used to limit this utility model.
This utility model relates to a kind of rural power grids low-voltage controlling device, including dynamic reactive compensation device and dynamic voltage adjustment device, the AC of dynamic reactive compensation device is connected on the output bus of distribution transformer, DC side connects storage capacitor, storage capacitor is also as the DC side energy storage link of dynamic voltage adjustment device, DC voltage is converted to adjustable alternating voltage by the inverter bridge of dynamic voltage adjustment device, and voltage scale is superimposed upon on the output bus of distribution transformer by series transformer；
The branch cable of near-end user is connected to the outfan of distribution power transformation device, and the branch cable of remote subscriber is connected to the outfan of series transformer.
Embodiment
1
Fig. 1 is first preferred structure of the present utility model, as shown in Figure 1, T1 is the distribution transformer of rural power grids, the dynamic passive compensation part of this device is constituted three-phase IGBT bridge by audion Q1 Q6, the AC of IGBT bridge is connected on the output bus of distribution transformer T1 by reactor L1 L3, the DC side of IGBT bridge is the three-phase IGBT bridge that DC capacitor C1, C2, Q7 Q12 constitutes pressure regulation part, and output is connected on series transformer T2 by filter reactance L4 L6.According to the load current of remote subscriber, dynamically regulate the SPWM waveform of Q7 Q12, make output can compensate for the pressure drop of loss on the cable of remote subscriber to the voltage of series transformer, it is ensured that remote subscriber side voltage is in the range of positive and negative the 10% of nominal voltage.Simultaneously according to three-phase imbalance composition, idle composition, the size of harmonic components in the total load electric current detected, control the SPWM waveform of Q1 Q6, the current waveform injected on T1 output bus by L1 L3 is made to can compensate for three-phase imbalance, idle composition, harmonic components so that the output voltage of transformator T1 is the most stable.
Such as, the impedance of the cable of remote subscriber is 0.3 Europe, when remote subscriber load current is 100A, the pressure drop of 30V is added up on cable, therefore Q7-Q12 needs to export the SPWM waveform of certain amplitude, make the output end voltage 30V higher than input of series transformer, the droop loss on compensating cable so that the voltage stabilization of user side is at about 220V.Power load distributing in rural power grids is uneven, and three-phase imbalance is relatively conventional, by the regulation of Q1-Q6 so that the outfan of distribution transformer T1, and three-phase current looks like balance, it is possible to reduce the loss of transformator to greatest extent, the output voltage of stabilizing transformer.
Embodiment
2
Fig. 2 is second preferred structure of the present utility model, as in figure 2 it is shown, dynamic reactive compensation device is made up of the capacitor of thyristor throw-cut, can carry out idle and unbalanced classification switching and administer；The uncontrollable rectifier bridge relying on diode D1 D6 to constitute carries out rectification and produces direct current, the IGBT bridge of the pressure regulation part that Q7 Q12 is constituted, identical with the scheme shown in embodiment 1, rectifier bridge can produce certain harmonic wave in running, but because the capacity of pressure regulation part is the least, therefore the deterioration of total harmonic wave inconspicuous, but complexity and the cost of system can be reduced.
Embodiment
3
Fig. 3 is the 3rd preferred structure of the present utility model, as shown in Figure 3, dynamic reactive compensation device can use the three-phase bridge of three-level structure, the most each brachium pontis can be made up of Q1 Q4 and D1, D2, take such measure, the electric pressure of semiconductor device can be reduced, improve switching frequency, thus reduce capacity and the reactor cost of L1 L3, dynamic voltage adjustment device is as embodiment 1 and 2, the IGBT bridge of the pressure regulation part that Q7 Q12 is constituted, because its output capacity is less, can maintain the scheme of three half-bridges.
Embodiment
4
Fig. 4 is the 4th preferred structure of the present utility model, as shown in Figure 4, three single-phase devices can be used to combine, as a example by a wherein phase, the H bridge that Q1 Q4 is constituted, as the IGBT bridge of dynamic passive compensation part, exports injecting compensating electric current on bus by L1 to the transformator of T1, and the voltage of DC side can be controlled in about 400V, the H bridge that Q7 Q10 is constituted is as the IGBT bridge of pressure regulation part, by L4 to T2 output regulation voltage.The advantage of the structure of the present embodiment is the device that all of semiconductor device can use 600V grade, and cheap and switching frequency can improve；Three-phase is all identical structure, therefore can carry out modularized design, it is simple to safeguard.
Embodiment described above only have expressed embodiment of the present utility model, and it describes more concrete and detailed, but therefore can not be interpreted as the restriction to this utility model the scope of the claims.It should be pointed out that, for the person of ordinary skill of the art, without departing from the concept of the premise utility, it is also possible to make some deformation and improvement, these broadly fall into protection domain of the present utility model.Therefore, the protection domain of this utility model patent should be as the criterion with claims.
Claims (6)
1. a rural power grids low-voltage controlling device, including dynamic reactive compensation device and dynamic voltage adjustment device, it is characterized in that: the AC of described dynamic reactive compensation device is connected on the output bus of distribution transformer, DC side connects storage capacitor, described storage capacitor is also as the DC side energy storage link of dynamic voltage adjustment device, DC voltage is converted to adjustable alternating voltage by the inverter bridge of described dynamic voltage adjustment device, and voltage scale is superimposed upon on the output bus of distribution transformer by series transformer；
The branch cable of near-end user is connected to the outfan of distribution power transformation device, and the branch cable of remote subscriber is connected to the outfan of series transformer.
Rural power grids low-voltage controlling device the most according to claim 1, it is characterized in that: the three-phase IGBT bridge that described dynamic reactive compensation device is made up of 6 insulated gate bipolar transistor IGBTs, AC is connected on the output bus of distribution transformer by 3 reactors, DC side is DC capacitor, the three-phase bridge that described dynamic voltage adjustment device is made up of 6 insulated gate bipolar transistor IGBTs forms, output is connected on series transformer by 3 filter reactors, load current according to remote subscriber, dynamically regulate the SPWM waveform of described dynamic voltage adjustment device audion, export the voltage of series transformer for compensating the pressure drop of loss on the cable of remote subscriber.
Rural power grids low-voltage controlling device the most according to claim 2, it is characterized in that: according to three-phase imbalance composition, idle composition, the size of harmonic components in the total load electric current detected, control the SPWM waveform of described dynamic reactive compensation device three-phase bridge so that the current waveform injected on distribution transformer output bus by reactor can compensate for three-phase imbalance, idle composition, harmonic components.
Rural power grids low-voltage controlling device the most according to claim 1, it is characterized in that: described dynamic reactive compensation device is made up of the capacitor of thyristor throw-cut, 6 diodes constitute uncontrollable rectifier bridge and produce DC voltage, connect DC capacitor, the three-phase bridge that described dynamic voltage adjustment device is made up of 6 IGBT forms, output is connected on series transformer by 3 filter reactors, load current according to remote subscriber, dynamically regulate the SPWM waveform of described dynamic voltage adjustment device audion, export the voltage of series transformer for compensating the pressure drop of loss on the cable of remote subscriber.
Rural power grids low-voltage controlling device the most according to claim 1, it is characterized in that: described dynamic reactive compensation device is made up of the three-phase bridge of three-level structure, each brachium pontis is made up of 4 IGBT and 2 diodes, AC is connected on the output bus of distribution transformer by reactor, DC side is DC capacitor, the three-phase bridge that described dynamic voltage adjustment device is made up of 6 IGBT forms, output is connected on series transformer by 3 filter reactors, load current according to remote subscriber, dynamically regulate the SPWM waveform of described dynamic voltage adjustment device audion, export the voltage of series transformer for compensating the pressure drop of loss on the cable of remote subscriber.
Rural power grids low-voltage controlling device the most according to claim 1, it is characterized in that: be made up of parallel three single phase device, the IGBT bridge that dynamic reactive compensation device described in each single phase device is constituted H bridge by 4 audions forms, AC is connected to injecting compensating electric current on the output bus of distribution transformer by reactor, DC side is DC capacitor, described dynamic voltage adjustment device is made up of H bridge and is connected on series transformer by filter reactor as IGBT bridge, output 4 audions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620330418.3U CN205724912U (en) | 2016-04-19 | 2016-04-19 | A kind of rural power grids low-voltage controlling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620330418.3U CN205724912U (en) | 2016-04-19 | 2016-04-19 | A kind of rural power grids low-voltage controlling device |
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| CN205724912U true CN205724912U (en) | 2016-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620330418.3U Withdrawn - After Issue CN205724912U (en) | 2016-04-19 | 2016-04-19 | A kind of rural power grids low-voltage controlling device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105703380A (en) * | 2016-04-19 | 2016-06-22 | 北京英博电气股份有限公司 | Low voltage control device for rural power grid |
| CN107086669A (en) * | 2017-06-13 | 2017-08-22 | 深圳国电粤能节能科技有限公司 | A kind of intelligence relaying supply unit |
| CN113675829A (en) * | 2021-09-01 | 2021-11-19 | 青岛鼎信通讯股份有限公司 | Direct-current short-circuit fault current-limiting circuit of low-voltage treatment device and control method thereof |
| CN114024319A (en) * | 2021-11-16 | 2022-02-08 | 国网湖南省电力有限公司 | Three-phase voltage treatment method and system |
-
2016
- 2016-04-19 CN CN201620330418.3U patent/CN205724912U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105703380A (en) * | 2016-04-19 | 2016-06-22 | 北京英博电气股份有限公司 | Low voltage control device for rural power grid |
| CN105703380B (en) * | 2016-04-19 | 2018-01-12 | 北京英博电气股份有限公司 | A kind of rural power grids low-voltage controlling device |
| CN107086669A (en) * | 2017-06-13 | 2017-08-22 | 深圳国电粤能节能科技有限公司 | A kind of intelligence relaying supply unit |
| CN113675829A (en) * | 2021-09-01 | 2021-11-19 | 青岛鼎信通讯股份有限公司 | Direct-current short-circuit fault current-limiting circuit of low-voltage treatment device and control method thereof |
| CN113675829B (en) * | 2021-09-01 | 2024-01-12 | 青岛鼎信通讯股份有限公司 | Direct-current short-circuit fault current limiting circuit of low-voltage treatment device and control method thereof |
| CN114024319A (en) * | 2021-11-16 | 2022-02-08 | 国网湖南省电力有限公司 | Three-phase voltage treatment method and system |
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Legal Events
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20161123 Effective date of abandoning: 20180112 |