CN201466725U - Voltage compensation device for low-voltage lines - Google Patents
Voltage compensation device for low-voltage lines Download PDFInfo
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- CN201466725U CN201466725U CN2009200862915U CN200920086291U CN201466725U CN 201466725 U CN201466725 U CN 201466725U CN 2009200862915 U CN2009200862915 U CN 2009200862915U CN 200920086291 U CN200920086291 U CN 200920086291U CN 201466725 U CN201466725 U CN 201466725U
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Abstract
The utility model relates to a voltage compensation device for low-voltage lines, which comprises an isolation transformer, an alternating current chopping module, a voltage measuring module, a voltage series module and a bypass switch. The connecting relations are that a low-voltage line, the isolation transformer and the alternating current chopping module are sequentially electrically connected; the alternating chopping module is also respectively electrically connected to the voltage measuring module and the voltage series module; after being connected in parallel, the voltage series module and the bypass switch are respectively electrically connected to a load; and the voltage measuring module is electrically connected to the low-voltage line. The voltage compensation device for low-voltage lines is powered by the low-voltage line via the isolation transformer, compensation voltage is produced by the alternating current chopping module according to voltage value measured by the voltage measuring module and transmitted to the voltage series module, thereby the voltage acquired by the load is assured to be within the standard value range. The voltage compensation device for low-voltage lines employs technology of power electronic alternating current chopping and method of voltage series compensation to control and stabilize the terminal voltage of the low-voltage line within a standard range, thereby resolving problems of relatively low voltage and instability of the low-voltage line caused by long distance electricity transmission.
Description
Technical field
The utility model relates to a kind of low-voltage line voltage compensating device, is applicable in the power distribution network, solves the low-voltage circuit process than the problem on the low side of the voltage behind the long distance power delivery.
Background technology
" rural area low-voltage power technical regulation " regulation: low radius of electricity supply of presenting a theatrical performance as the last item on a programme district's electrical network generally is no more than 500 meters.Yet in the rural power distribution net, because the dispersiveness that power consumer distributes, unavoidable existence is loaded less and radius of electricity supply surpasses 500 meters situation.Because load is less, be difficult to give the user with electric power from the consideration of economic benefit, so selection is powered with low-voltage circuit with the 10kV medium-voltage line; But low-voltage circuit is through the electricity that send of long distance, and terminal voltage can fluctuate on a large scale along with the change of customer charge, can not satisfy the normal electricity consumption needs of user.
At present more existing devices that low-voltage network voltage is compensated, to improve the rural power grids power supply quality and to reduce investment, but still have its weak point, comprise voltage detection department, compensating circuit, control part, circuit breaker and short switch as patent CN200410083143.X " voltage compensating device ", this device is superimposed on the supply voltage bucking voltage of compensating circuit output and compensating load, when the circuit breaker of being located at the upstream disconnected, fast detecting also stopped unwanted voltage compensation action; The voltage detection department that detects supply voltage possesses the device of the phase place that detects supply voltage, and detection supply voltage phase place surpasses ormal weight than reference phase and changes in compensating movement, judges that then upstream circuit breaker is disconnection, finishes compensating movement.The voltage generator of this patented technology mainly is to carry out inversion by DC power supply to be converted to alternating current, is loaded into line voltage then, the sport technique segment complexity, and cost is higher.This patent is to judge whether this end of compensation by the variation that the phase place that detects supply voltage surpasses ormal weight than the phase place of reference voltage, and whether the effective value of line voltage is not lower than national standard as criterion.
And among the patent CN200620036663.X " digital low-voltage compensation arrangement ", behind the indirect energy-storage units of main circuit voltage input and output side, parallel IGBT boost chopper module, series IGBT afterflow module and output filter circuit again; Establish in the control loop and contain sampling, comparison, adjustable feedback unit, single-chip microcomputer is made control circuit, IGBT drive circuit, connects the G utmost point of each IGBT switch element of major loop at last.Voltage compensating device in this patent need be born customer charge fully, so less relatively, the required installed capacity of device institute's on-load is relatively large, equipment cost and fail safe certainly will be subjected to very big influence; Device need hang between grid side and the user side always, has strengthened the loss of electrical network to a certain extent, in case device breaks down, power supply stops, so power supply reliability is relatively poor.
Summary of the invention
The purpose of this utility model is to provide a kind of low-voltage line voltage compensating device, it has solved low-voltage circuit because the on the low side and instability problem of voltage that long distance power delivery causes, both satisfied the economy requirement that electric power is carried, satisfied the requirement of user again quality of voltage.
The technical solution of the utility model is: low-voltage line voltage compensating device, comprise by-pass switch, and it is characterized in that: also comprise isolating transformer, AC chopping module, voltage measurement module, Voltage Series module; Its annexation is: low-voltage circuit, isolating transformer and AC chopping module are electrically connected successively, the AC chopping module also is electrically connected voltage measurement module and Voltage Series module respectively, be electrically connected with load respectively after Voltage Series module and the by-pass switch parallel connection, voltage measurement module is electrically connected low-voltage circuit.
Aforesaid low-voltage line voltage compensating device is characterized in that: adopt 16 single-chip microcomputers of MSP430 series in the AC chopping module.
Aforesaid low-voltage line voltage compensating device is characterized in that: the AC chopping module adopts the IGBT of 4 band fly-wheel diodes, constitutes two two-way power switch; Each IGBT buffer circuit all in parallel.
Aforesaid low-voltage line voltage compensating device is characterized in that: isolating transformer is a step-down transformer, its secondary ac capacitor in parallel.
The beneficial effects of the utility model are: employing power electronics AC wave chopping technology and Voltage Series compensation way in critical field, solve low-voltage circuit because the on the low side and instability problem of voltage that long distance power delivery causes with low-voltage circuit terminal voltage control stabilization.
1, the utility model at first is to introduce line voltage by step-down isolation transformer, by the AC chopping module electric capacity is discharged and recharged then, at last the electric capacity both end voltage is connected in series on the electrical network to reach the purpose of booster tension, and is simple in structure.Utilization power electronics AC wave chopping technology.
2, whether the utility model mainly is lower than national standard by the effective value of detection of grid voltage and judges whether this end of compensation, and criterion is clear and definite.
3, the utility model mainly is to utilize to be connected on the electrical network after the capacitance energy storage, thereby reaches the purpose that promotes line voltage, and patent CN200620036663.X is then simple passes through IGBT boost chopper lifting system voltage.
2, the utility model just provides the voltage of a very little part for the user, and most voltage is still taken from system side, so this device institute on-load is bigger.
3, the utility model is with the foundation of line voltage as voltage compensation, the low more then voltage by the AC chopping module for compensating of line voltage is also just high more, patent CN200620036663.X then is according to user side voltage foundation by way of compensation, controls cut-offfing of IGBT boost chopper module by feedback unit.
4, the utility model carries intelligent voltage and detects control, when line voltage just often, device can be automatically by dropping into the bypass operation, the AC chopping module quits work, cross when low when detecting line voltage, then disconnect bypass, promote line voltage through AC chopping module and Voltage Series module, during the user can not have a power failure.
5, the utlity model has the self check error correction, when breaking down, device inside can jump to the bypass operation automatically, device is stopped transport or is restarted, can guarantee that the user does not have a power failure, and the compensation arrangement among the patent CN200620036663.X directly is connected on electrical network and the subscriber's line, and user's power supply is certain to receive influence during plant failure.
Description of drawings
Fig. 1 the utility model embodiment device structural representation.
Fig. 2 the utility model embodiment device circuit theory diagrams.
Embodiment
Below in conjunction with drawings and Examples the utility model is further described.
The explanation of mark among Fig. 1: 1-low-voltage circuit, 2-isolating transformer, 3-AC chopping module, 4-voltage measurement module, 5-Voltage Series module, 6-by-pass switch, 7-load.
The explanation of mark: S1-input circuit breaker among Fig. 2, S2-bypass breaker (being 6 among Fig. 1), S3-exports circuit breaker, C1-electric capacity, L1-inductance.
As depicted in figs. 1 and 2, the utility model embodiment low-voltage line voltage compensating device comprises isolating transformer 2, AC chopping module 3, voltage measurement module 4, Voltage Series module 5, by-pass switch 6, input circuit breaker S1 and output circuit breaker S3; Its annexation is: low-voltage circuit 1, isolating transformer 2 and AC chopping module 3 are electrically connected successively; AC chopping module 3 also is electrically connected voltage measurement module 4 and Voltage Series module 5 respectively; Voltage Series module 5 other ends are electrically connected load 7 and by-pass switch 6 respectively by output circuit breaker S3, and wherein by-pass switch 6 is in parallel with Voltage Series module 5; Low-voltage circuit 1 is electrically connected isolating transformer 2 and voltage measurement module 4. respectively by input circuit breaker S1
To low-voltage circuit 1 power taking, the magnitude of voltage that AC chopping module 3 records by voltage measurement module 4 produces bucking voltage and delivers to Voltage Series module 5 the utility model embodiment by isolating transformer 2, and the voltage that guarantees load 7 acquisitions is in standard value range.When Voltage Series module 5 upside line voltage distributions in standard value range or during plant failure, AC chopping module 3 is sent instruction and is made its closure for by-pass switch 6, embodiment of the invention device (stopping bucking voltage) out of service, circuit to load 7 power supplies, guarantee that load 7 does not have a power failure through by-pass switch 6.
Power just often, closes bypass switch 6, the bucking voltage that stops; When voltage measurement module 4 detected supply voltage decline, AC chopping module 3 was sent instruction and it is disconnected for by-pass switch 6, switches to the bucking voltage supply capability by Voltage Series module 5; AC chopping module 3 output bucking voltages, this bucking voltage is superimposed upon on the supply voltage, supplies with load 7.
The utility model embodiment is based on power electronic technology, and along with the fast development of power electronic technology, the increase of IGBT device capacity and the reduction of cost can realize the purpose of AC voltage adjusting with less switching device based on the voltage compensation of power electronic technology.
The utility model embodiment is series at electrical network, when electric voltage dropping, only the part of compensation network electric voltage dropping is kept the load voltage value of the preceding terminal voltage of load at 220V, and do not need to provide to load fully the voltage of 220V, so the power of the embodiment of the invention is less than bearing power.
The utility model embodiment has by-pass switch 6, and during the normal or plant failure of line voltage distribution, electrical network to load 7 power supplies, keeps that load is not tripped, not power down through bypass.
Therefore the output voltage of the utility model embodiment and line voltage install input and isolate by isolating transformer 2 and electrical network end not altogether.Isolating transformer 2 is a step-down transformer, can reduce the electric pressure requirement of IGBT in the device.Isolating transformer 2 secondary ac capacitor C1 in parallel, the reactive power consumption of compensation arrangement.Input passes through isolating transformer 2 to the power taking of circuit upside, and isolates with the upside circuit.
The incomplementarity control mode that the control mode of the utility model embodiment adopts no current to detect; the on off state of 4 IGBT in the positive and negative half period of embodiment of the invention front end line voltage in the AC chopping module 3 is asymmetric; this mode provides safe and effective continuous current circuit for the filter inductance L1 in the Voltage Series module 5, can effectively protect the safety in utilization of IGBT.
The utility model embodiment adopts open loop control mode, and the voltage at load 7 places after the compensation that need not to sample detects embodiment of the invention front end line voltage, produces corresponding compensation voltage, and this control mode is simple.
The control mode of IGBT adopts the pulse-width modulation circuit of duty ratio modulation.The cycle of each control impuls is fixed, and duty ratio is adjusted according to the bucking voltage of device output and the ratio of line voltage distribution.This mode response speed is fast, and the output voltage fluctuation is little.
Each IGBT buffer circuit all in parallel absorbs the due to voltage spikes that produces when IGBT turn-offs, for IGBT provides protection more fully.
Adopt 16 single-chip microcomputers of MSP430 series in the AC chopping module 3 of the utility model embodiment, this single-chip microcomputer adopts reduced instruction set computer, have abundant addressing system, succinct core instructions, instruction execution speed is fast, chip integration has become more interrupt source and peripheral module, the save design cost provides desin speed.And this single-chip microcomputer has power consumption considerably.
Claims (4)
1. low-voltage line voltage compensating device comprises by-pass switch, it is characterized in that: also comprise isolating transformer, AC chopping module, voltage measurement module, Voltage Series module; Its annexation is: low-voltage circuit, isolating transformer and AC chopping module are electrically connected successively, the AC chopping module also is electrically connected voltage measurement module and Voltage Series module respectively, be electrically connected with load respectively after Voltage Series module and the by-pass switch parallel connection, voltage measurement module is electrically connected low-voltage circuit.
2. low-voltage line voltage compensating device according to claim 1 is characterized in that: adopt 16 single-chip microcomputers of MSP430 series in the AC chopping module.
3. low-voltage line voltage compensating device according to claim 1 is characterized in that: the AC chopping module adopts the IGBT of 4 band fly-wheel diodes, constitutes two two-way power switch; Each IGBT buffer circuit in parallel.
4. low-voltage line voltage compensating device according to claim 1 is characterized in that: isolating transformer is a step-down transformer, its secondary ac capacitor in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200862915U CN201466725U (en) | 2009-06-05 | 2009-06-05 | Voltage compensation device for low-voltage lines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200862915U CN201466725U (en) | 2009-06-05 | 2009-06-05 | Voltage compensation device for low-voltage lines |
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| Publication Number | Publication Date |
|---|---|
| CN201466725U true CN201466725U (en) | 2010-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200862915U Expired - Fee Related CN201466725U (en) | 2009-06-05 | 2009-06-05 | Voltage compensation device for low-voltage lines |
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| CN (1) | CN201466725U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101859157A (en) * | 2010-07-20 | 2010-10-13 | 哈尔滨威瀚电气设备股份有限公司 | Current compensation type alternating-current voltage stabilizer |
| CN106229989A (en) * | 2016-04-22 | 2016-12-14 | 金陵科技学院 | A kind of method improving rural power grids voltage |
-
2009
- 2009-06-05 CN CN2009200862915U patent/CN201466725U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101859157A (en) * | 2010-07-20 | 2010-10-13 | 哈尔滨威瀚电气设备股份有限公司 | Current compensation type alternating-current voltage stabilizer |
| CN101859157B (en) * | 2010-07-20 | 2013-01-02 | 哈尔滨威瀚电气设备股份有限公司 | Current compensation type alternating-current voltage stabilizer |
| CN106229989A (en) * | 2016-04-22 | 2016-12-14 | 金陵科技学院 | A kind of method improving rural power grids voltage |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: WUHAN JIAMING KAIER ELETRIC POWER TECHNOLOGY DEVEL Free format text: FORMER OWNER: WUHAN YUGA TIANMING ELECTRIC TECHNOLOGY CO., LTD. Effective date: 20140320 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 430072 WUHAN, HUBEI PROVINCE TO: 430074 WUHAN, HUBEI PROVINCE |
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| TR01 | Transfer of patent right |
Effective date of registration: 20140320 Address after: 430074 Hubei city in Wuhan Province, Wuhan University of science and Technology Park of East Lake Development Zone National Geospatial Information Industry base two South building two unit four floor No. 2 Patentee after: WUHAN JIAMI KAIER ELECTRIC TECHNOLOGY DEVELOPMENT CO., LTD. Address before: Study on new technology of electrical 430072 Hubei city of Wuhan province Wuchang LUOJIASHAN Electrical Engineering College of Wuhan University Patentee before: Wuhan Yuga Tianming Electric Technology Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100512 Termination date: 20170605 |