CN101572413A - Low-voltage line voltage compensating device and compensating method thereof - Google Patents
Low-voltage line voltage compensating device and compensating method thereof Download PDFInfo
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- CN101572413A CN101572413A CNA2009100625223A CN200910062522A CN101572413A CN 101572413 A CN101572413 A CN 101572413A CN A2009100625223 A CNA2009100625223 A CN A2009100625223A CN 200910062522 A CN200910062522 A CN 200910062522A CN 101572413 A CN101572413 A CN 101572413A
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Abstract
The invention relates to a low-voltage line voltage compensating device and a compensating method thereof. The device comprises an isolating transformer, an alternating current chopper module, a voltage measuring module, a voltage series module and a by-pass switch; the connection relation comprises that a low-voltage line, the isolating transformer and the alternating current chopper module are electrically connected in turn; the alternating current chopper module is electrically connected with the voltage measuring module and the voltage series module respectively; the voltage series module and the by-pass switch are connected in parallel and then are electrically connected with a load respectively; and the voltage measuring module is connected with the low-voltage line. By taking electricity from the low-voltage line through the isolating transformer, the voltage value of the alternating current chopper module measured by the voltage measuring module generates a compensating voltage, and then the compensating voltage is sent to the voltage series module so as to ensure the voltage acquired by the load in a range of standard value. The method adopts power-electronics alternating current chopper technology and voltage series compensating modes to control and stabilize the voltage at the tail end of the low-voltage line in the standard range, and solves the problem of low and unstable voltage of the low-voltage line due to long-distance power transmission.
Description
Technical field
The present invention relates to a kind of low-voltage line voltage compensating device and compensation method thereof, be applicable in the power distribution network, solve 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 object of the present invention is to provide a kind of low-voltage line voltage compensating device and compensation method thereof, 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.
Technical scheme of the present invention is: a kind of 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.
A kind of compensation method of low-voltage line voltage compensating device, it is characterized in that: adopt power electronics AC wave chopping technology and Voltage Series compensation technique, by isolating transformer to the low-voltage circuit power taking, the magnitude of voltage that the AC chopping module records by voltage measurement module, produce bucking voltage and deliver to the Voltage Series module, the voltage that guarantees the load acquisition is in standard value range.
The compensation method of aforesaid low-voltage line voltage compensating device is characterized in that: the incomplementarity control mode that adopts no current to detect, the on off state of 4 IGBT in the positive and negative half period of front end line voltage in the AC chopping module is asymmetric.
The compensation method of aforesaid low-voltage line voltage compensating device is characterized in that: adopt open loop control mode, the voltage at the load place after the compensation that need not to sample detects the front end line voltage, produces corresponding compensation voltage.
The compensation method of aforesaid low-voltage line voltage compensating device, it is characterized in that: 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.
The invention has the beneficial effects as follows: 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 present invention introduces 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 present invention 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 present invention utilizes 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 present invention 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 present invention 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 present invention 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 present invention 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 embodiment of the invention apparatus structure schematic diagram.
Fig. 2 embodiment of the invention device circuit schematic diagram.
Embodiment
Below in conjunction with drawings and Examples the present invention 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, embodiment of the invention 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 embodiment of the invention 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 embodiment of the invention 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 embodiment of the invention 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 embodiment of the invention 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 embodiment of the invention 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 embodiment of the invention 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 embodiment of the invention 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 embodiment of the invention, 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 (8)
1, a kind of 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.
5, a kind of compensation method of low-voltage line voltage compensating device, it is characterized in that: adopt power electronics AC wave chopping technology and Voltage Series compensation technique, by isolating transformer to the low-voltage circuit power taking, the magnitude of voltage that the AC chopping module records by voltage measurement module, produce bucking voltage and deliver to the Voltage Series module, the voltage that guarantees the load acquisition is in standard value range.
6, the compensation method of low-voltage line voltage compensating device according to claim 5, it is characterized in that: the incomplementarity control mode that adopts no current to detect, the on off state of 4 IGBT in the positive and negative half period of front end line voltage in the AC chopping module is asymmetric.
7, the compensation method of low-voltage line voltage compensating device according to claim 5 is characterized in that: adopt open loop control mode, the voltage at the load place after the compensation that need not to sample detects the front end line voltage, produces corresponding compensation voltage.
8, the compensation method of low-voltage line voltage compensating device according to claim 5, it is characterized in that: 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910062522.3A CN101572413B (en) | 2009-06-05 | 2009-06-05 | Low-voltage line voltage compensating device and compensating method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910062522.3A CN101572413B (en) | 2009-06-05 | 2009-06-05 | Low-voltage line voltage compensating device and compensating method thereof |
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| CN101572413A true CN101572413A (en) | 2009-11-04 |
| CN101572413B CN101572413B (en) | 2015-01-14 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106684876A (en) * | 2017-01-21 | 2017-05-17 | 河北郎尊电力科技有限公司 | Tail-end low-voltage compensation device of rural power grid |
| CN107425711A (en) * | 2017-03-30 | 2017-12-01 | 苏州市职业大学 | A kind of high efficiency energy two-way DC converter and control method |
| CN108365605A (en) * | 2018-03-08 | 2018-08-03 | 西安爱科赛博电气股份有限公司 | A kind of low-voltage network three-phase line low-voltage governing system and method |
| CN112035784A (en) * | 2020-07-16 | 2020-12-04 | 中国电力科学研究院有限公司 | Method and system for determining loss of low-voltage transformer area based on power consumption acquisition data |
-
2009
- 2009-06-05 CN CN200910062522.3A patent/CN101572413B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106684876A (en) * | 2017-01-21 | 2017-05-17 | 河北郎尊电力科技有限公司 | Tail-end low-voltage compensation device of rural power grid |
| CN107425711A (en) * | 2017-03-30 | 2017-12-01 | 苏州市职业大学 | A kind of high efficiency energy two-way DC converter and control method |
| CN108365605A (en) * | 2018-03-08 | 2018-08-03 | 西安爱科赛博电气股份有限公司 | A kind of low-voltage network three-phase line low-voltage governing system and method |
| CN112035784A (en) * | 2020-07-16 | 2020-12-04 | 中国电力科学研究院有限公司 | Method and system for determining loss of low-voltage transformer area based on power consumption acquisition data |
| CN112035784B (en) * | 2020-07-16 | 2024-04-09 | 中国电力科学研究院有限公司 | Method and system for determining loss of low-voltage transformer area based on electricity consumption acquisition data |
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| CN101572413B (en) | 2015-01-14 |
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