CN104505839B - Networking system of dynamic voltage restorer - Google Patents
Networking system of dynamic voltage restorer Download PDFInfo
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- CN104505839B CN104505839B CN201410810197.5A CN201410810197A CN104505839B CN 104505839 B CN104505839 B CN 104505839B CN 201410810197 A CN201410810197 A CN 201410810197A CN 104505839 B CN104505839 B CN 104505839B
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- 230000006855 networking Effects 0.000 title abstract description 4
- 238000001514 detection method Methods 0.000 claims description 14
- 238000004146 energy storage Methods 0.000 claims description 12
- 238000007689 inspection Methods 0.000 claims description 11
- 238000011084 recovery Methods 0.000 claims description 11
- 230000008034 disappearance Effects 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 230000007175 bidirectional communication Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001983 electron spin resonance imaging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a networking system of a dynamic voltage restorer. The networking system comprises a DVR (Dynamic Voltage Restorer) switch unit, a DVR host machine and a plurality of DVR slave machines, wherein the DVR switch unit comprises a bypass switch and two repairing switches; the DVR host machine and the DVR slave machines are arranged between the two repairing switches in parallel; a control unit in the DVR host machine respectively performs bidirectional communication with the control unit in each DVR slave machine and is also respectively connected with the bypass switch and the two repairing switches; parallel control adopts that the DVR host machine detects dropping control to output compensation voltage; the DVR slave machines receive a voltage falling instruction and an output current instruction which are transmitted by the DVR host machine and output a control mode of given current. The DVR host machine controls a parallel finished machine system to switch among different states (compensation, bypass and halt states), in the compensation state, the DVR host machine controls the system to output compensation voltage for a voltage source, and the DVR slave machines control the system as a current source to output given compensation current of the host machine.
Description
Technical field
The present invention relates to the dynamic electric voltage recovery device of power system, more specifically, is to be related to a kind of dynamic electric voltage to recover
The group network system of device.
Background technology
In industry such as quasiconductor, petrochemical industry, automobile etc. of many accurate production continuous processings, many equipment have to voltage stabilization
Very high requirement, if voltage falling for (several cycles being in several seconds) in short-term occurs and can all cause equipment downtime damage, work
The consequences such as sequence time-out, material scrap, cause huge directly or indirectly economic loss.
External EPRI statistical results：The U.S. causes hundred million dollars of losses of 1500-1900 because of power failure and the quality of power supply every year, wherein
Voltage Drop causes damage and accounts for more than 90%.And Voltage Drop causes a large amount of losses at home, fall the direct damage brought every time
Lose tens of thousands of units, units up to up to a million, therefore Voltage Drop at least and can cause the society such as production, military affairs, aviation, social activity shadow
Ring.
Dynamic electric voltage recovery device abbreviation DVR is a kind of power electronic equipment being series between sensitive loads and electrical network, is used
Impact of the sensitive loads from Voltage Drop in power distribution network is protected.The load capacity that the configuration capacity of DVR is protected with which is identical,
Existing DVR is run using separate unit mostly, and in the increasing application scenario of sensitive loads capacity, separate unit DVR capacity is
The demand of load cannot be met.
When electrical network is normal, DVR is in bypass condition to current DVR：(solid-state by-pass switch can be the by-pass unit of DVR
The IGBT or IGCT of two-way admittance) ON operation powering load, DVR in hot stand-by duty not output voltage, specifically
As shown in Figure 1.When electrical network occur in short-term when falling, DVR can be detected immediately upon falling, into compensating coefficient：By by-pass unit
Shut-off, and an offset voltage is exported by compensating unit, it is ensured that the voltage stabilization of sensitive loads, specifically as shown in Figure 2.When
When DVR needs to safeguard or break down, DVR enters stopped status：Mechanical bypass switch is closed, and DVR is opened by mechanical by-pass
Close proof load and supply electrically continuous, specifically as shown in Figure 3.
The content of the invention
For defect present in prior art, it is an object of the invention to provide a kind of networking system of dynamic electric voltage recovery device
System.
For reaching above-mentioned purpose, the present invention is adopted the following technical scheme that：
A kind of group network system of dynamic electric voltage recovery device, including DVR switch elements, the DVR switch elements include one
By-pass switch and two inspection switch, also including a DVR main frame and some DVR slaves, the DVR main frames and
DVR slaves are attempted by between described two inspection switch, the control unit in the DVR main frames respectively with every DVR slave
In control unit realize two-way communication, the control unit in the DVR main frames also respectively with by-pass switch and two maintenance
Switch is connected；
Parallel Control falls controlled output offset voltage using DVR Host Detections, and DVR slaves receive what DVR main frames sent
Voltage Drop is instructed and output current is instructed and exports the control model of given electric current.
The Parallel Control is further included：
Control unit detecting system voltage in DVR main frames carries out Voltage Drop detection and judges, when detecting Voltage Drop
When, DVR control main frames turn off its by-pass unit, while detecting the offset voltage and output current of feedback main frame output, DVR controls
Main frame is a voltage-controlled voltage source, exports a given offset voltage；After Voltage Drop disappears, in DVR main frames
Control unit control its by-pass unit and re-close；
Control unit in DVR main frames sends voltage in real time, and whether drop information is to each DVR slaves, while sending each slave
Instruction current, each slave receives the voltage of DVR main frames transmission whether drop information and real-time current-order, once be connected to
The Voltage Drop instruction that DVR main frames send, the control unit in DVR slaves controls its by-pass switch and disconnects, while control is corresponding
DVR slaves be a current control current source, export the given output current of DVR main frames；When the control list in DVR slaves
Unit is received after falling disappearance of signal, and the control unit in DVR slaves re-closes its by-pass unit.
The given electric current of some DVR slaves output is equal.
The DVR main frames include taking energy/energy-storage units, compensating unit, filter unit, by-pass unit and control unit,
Described control unit respectively with take energy/energy-storage units, compensating unit, filter unit, by-pass unit and be connected.
The DVR slaves include taking energy/energy-storage units, compensating unit, filter unit, by-pass unit and control unit,
Described control unit respectively with take energy/energy-storage units, compensating unit, filter unit, by-pass unit and be connected.
Compared with prior art, using a kind of group network system of dynamic electric voltage recovery device of the present invention, it is responsible for by DVR main frames
The state of real-time detecting system, by DVR host computer controls parallel connection machine system different conditions (compensation, bypass, stopped status) it
Between switch, DVR main frames send the instruction that whether compensates and current-order gives DVR slaves, under compensating coefficient DVR host computer controls its be
One voltage source, exports offset voltage, and it is a current source that DVR slaves control which, exports the given compensation electric current of main frame.Pass through
The present invention can also realize that electric currents of the DVR between the multimachine under multi-machine parallel connection pattern flows, and solve DVR unit compensation capacities
Not enough problem.
Description of the drawings
Fig. 1 is principle schematic of the dynamic electric voltage recovery device of the prior art in bypass condition；
Fig. 2 is the principle schematic of dynamic electric voltage recovery device in Fig. 1 in compensating coefficient；
Fig. 3 is the principle schematic of dynamic electric voltage recovery device in Fig. 1 in stopped status；
Fig. 4 is the principle schematic of embodiments of the invention；
Fig. 5 is the control schematic diagram of embodiments of the invention.
Specific embodiment
Technical scheme is further illustrated with reference to the accompanying drawings and examples.
Embodiment
A kind of group network system of the dynamic electric voltage recovery device shown in Fig. 4 is referred to, including following components：DVR is switched
Unit, DVR main frames, DVR slaves 1, DVR 2～n of slave are (according to number n) in parallel.
DVR switch elements include mechanical bypass switch and inspection switch, and mechanical bypass switch can be chopper, and maintenance is opened
Closing can be isolation knife or chopper；
DVR main frames are connected with two inspection switch in DVR switch elements.
DVR main frames include taking energy/energy-storage units, compensating unit, filter unit, by-pass unit and control unit, wherein take
Energy/energy-storage units can be that to take from electrical network can also be stored in power grid energy in super capacitor or battery, and compensation is single
Unit is single-phase or 3 phase inverters, and will take the DC voltage inversion that energy/energy storage unit obtains is an AC compensation electricity
Pressure, and be injected in electrical network by LC filter units leach HF switch subharmonic after (can by transformator inject also can be straight
Inject after connecing filtering), by-pass unit can be the electronic power switch device such as antiparallel IGBT or IGCT.DVR main frames
In control unit control and detect DVR main frames in unit, while control and detect DVR switch elements in machinery open
Close and inspection switch, and controlled quentity controlled variable is passed to into the control unit in DVR slaves.
DVR slaves comprising with DVR main frame identical units, the input and output of DVR slaves are defeated with DVR host machine parts respectively
Enter and be connected with output, and be connected with two inspection switch of DVR switch elements.Slave number in parallel can be for 1 or more
It is individual.
DVR control method for parallel proposed by the present invention is as shown in Figure 5：
DVR Parallel Controls fall controlled output offset voltage using Host Detection, and slave receives host voltage and falls instruction
The control model of the given electric current of output is instructed with output current.
Control unit detecting system voltage in DVR main frames carries out Voltage Drop detection and judges, once detect voltage fall
Fall, control main frame turns off its by-pass unit, while detecting the offset voltage and output current of feedback main frame output, DVR main frames are
One voltage-controlled voltage source, exports a given offset voltage.After disappearance is fallen, its bypass of DVR host computer controls is single
Unit re-closes.When a failure occurs, console controller controlling switch unit closure.
There are two-way communication connection, DVR main frames between the control unit in control unit and DVR slaves in DVR main frames
In control unit send voltage in real time whether drop information be to each DVR slaves, while send the instruction current of each slave, respectively
DVER slaves receive the voltage of DVR main frames transmission whether drop information and real-time current-order.Once it is connected to main frame transmission
Voltage Drop is instructed, and the control unit in DVR slaves controls its by-pass unit and disconnects, while controlling slave for a current control
Current source, export the given output current of main frame.Once the control unit in DVR slaves receives Voltage Drop disappearance of signal
Afterwards, the control unit in DVR slaves re-closes its by-pass unit.
DVR main frames be responsible for whole system coordination control, including fall detection, state switching control, voltage compensation,
Man-machine interaction etc..
The method of wherein Voltage Drop detection has various, can be divided into single-phase detection and two class of three-phase detection, per class method
In again have several different detection algorithms.Three-phase detection method is managed according to symmetrical components by detecting three-phase power grid voltage signal
By three-phase voltage signal is resolved into positive-sequence component, negative sequence component and zero-sequence component.Voltage Drop detection side based on three-phase
Method, different detection methods focus primarily upon the positive-sequence component for how quickly and to effectively calculating three-phase voltage in real time, Yi Jihe
On the criterion of reason.When three-phase voltage signal occurs three-phase symmetrical to be fallen, three-phase voltage signal comprises only positive-sequence component, inspection
The amplitude of positive-sequence component is surveyed, when the amplitude of positive-sequence component threshold value certain less than three-phase voltage amplitude rated value, judges that voltage falls
The failure that falls occurs；And when three-phase voltage signal occur asymmetrical three-phase fall when, in three-phase voltage signal will containing positive-sequence component,
Negative sequence component and zero-sequence component, this causes to judge that unbalanced network voltage falls becomes complicated.For asymmetric three-phase voltage, Jing
After crossing general dq conversion, contain the AC compounent (negative sequence component) of DC component (positive-sequence component) and 2 frequencys multiplication in dq components,
And other high-order components (harmonic component), whether can fall less than three-phase voltage amplitude nominal threshold value according to positive-sequence component
Criterion is judging, it is also possible to judged with reference to the size of negative sequence component jointly.
Detecting and falling rear DVR main frames and drop signal is sent to DVR slaves rapidly, DVR main frames and DVR slaves are synchronous from side
Line state (by-pass unit conducting) is switched to compensating coefficient (by-pass unit is turned off, compensating unit work), under compensating coefficient, DVR
Main frame is controlled as a voltage-controlled voltage source, passes through voltage close loop controlled output one according to the drop-off voltage for detecting
Offset voltage, it is ensured that load voltage is stablized, and the current-order that DVR slaves are issued according to DVR main frames, by current closed-loop control
System is controlled as the current source of a current control, shares fractional load electric current, so as to realize electric current DVR main frames and DVR from
Reasonable distribution between machine.After falling disappearance, DVR main frames send to slave and fall disappearance information, and DVR main frames and DVR slaves are same
Step is switched to bypass condition from compensating coefficient.
Those of ordinary skill in the art is it should be appreciated that the embodiment of the above is intended merely to illustrate the present invention's
Purpose, and limitation of the invention is not used as, as long as in the essential scope of the present invention, the change to embodiment described above
Change, modification will all fall in the range of the claim of the present invention.
Claims (4)
1. a kind of group network system of dynamic electric voltage recovery device, including DVR switch elements, the DVR switch elements include a side
Way switch and two inspection switch, it is characterised in that
Also include that a DVR main frame and some DVR slaves, the DVR main frames and DVR slaves are attempted by described two
Between inspection switch, DVR main frames and every DVR slave are including the by-pass unit being connected between two inspection switch, institute
State the control unit in DVR main frames two-way communication is realized with the control unit in every DVR slave respectively, the DVR main frames,
Control unit in DVR slaves is also connected with respective by-pass unit and two inspection switch respectively；
Parallel Control adopts DVR Host Detection Voltage Drop controlled output offset voltages, DVR slaves to receive what DVR main frames sent
Voltage Drop is instructed and the current-order for exporting the control model for exporting given electric current；
The Parallel Control is further included：
Control unit detecting system voltage in DVR main frames carries out Voltage Drop detection and judges, when Voltage Drop is detected,
DVR main frames turn off its by-pass unit, while detecting the offset voltage and output current of feedback DVR main frame outputs, DVR main frames are one
Individual voltage-controlled voltage source, exports a given offset voltage；Control list after Voltage Drop disappears, in DVR main frames
Unit controls its by-pass unit and re-closes；
Control unit in DVR main frames sends voltage in real time, and whether drop information is to each DVR slaves, while sending each DVR slaves
Current-order, each DVR slaves receive the voltage of DVR main frames transmission whether drop information and real-time current-order, once connect
To the Voltage Drop instruction that DVR main frames send, the control unit in DVR slaves controls its by-pass unit and disconnects, while controlling phase
The DVR slaves answered are the current source of a current control, export the given output current of DVR main frames；Control in DVR slaves
After unit receives Voltage Drop disappearance of signal, the control unit in DVR slaves re-closes its by-pass unit.
2. group network system according to claim 1, it is characterised in that
The given electric current of some DVR slaves output is equal.
3. group network system according to claim 1, it is characterised in that
The DVR main frames include taking energy/energy-storage units, compensating unit, filter unit, by-pass unit and control unit, DVR master
Control unit in machine takes energy/energy-storage units, compensating unit, filter unit, by-pass unit with which respectively and is connected.
4. group network system according to claim 1, it is characterised in that
The DVR slaves include taking energy/energy-storage units, compensating unit, filter unit, by-pass unit and control unit, DVR from
Control unit in machine takes energy/energy-storage units, compensating unit, filter unit, by-pass unit with which respectively and is connected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410810197.5A CN104505839B (en) | 2014-12-19 | 2014-12-19 | Networking system of dynamic voltage restorer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410810197.5A CN104505839B (en) | 2014-12-19 | 2014-12-19 | Networking system of dynamic voltage restorer |
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| CN104505839A CN104505839A (en) | 2015-04-08 |
| CN104505839B true CN104505839B (en) | 2017-03-22 |
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| CN110518592B (en) * | 2019-07-10 | 2021-03-16 | 广东电网有限责任公司广州供电局 | Parallel control method and device for voltage sag treatment equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5261967B2 (en) * | 2007-04-17 | 2013-08-14 | 富士電機株式会社 | Voltage fluctuation compensator control method |
| CN101403780B (en) * | 2008-11-13 | 2011-06-01 | 中国电力科学研究院 | Laboratory test device and method for dynamic electric voltage recovery device |
| CN101873459A (en) * | 2010-03-15 | 2010-10-27 | 杭州海康威视数字技术股份有限公司 | Cascade network based DVR (Digital Video Recorder) operation method, system and DVR device |
| CN102394499B (en) * | 2011-11-03 | 2014-08-27 | 东南大学 | Multi-machine graded type complete active control device for low-voltage heavy-current harmonic waves |
| CN103580028A (en) * | 2013-11-13 | 2014-02-12 | 丽水职业技术学院 | Dynamic voltage recovery system based on IOT (Internet of Things) technology |
| CN104052062B (en) * | 2014-06-10 | 2016-01-20 | 江苏大学 | Based on the dynamic electric voltage recovery device compensating control method that minimum active power is injected |
| CN104135009B (en) * | 2014-07-16 | 2016-06-29 | 清华大学 | A kind of parallel connection type Unified Power Quality Controller and progress control method thereof |
| CN104218584B (en) * | 2014-09-16 | 2016-04-06 | 东南大学 | A kind of active harmonic control device multi-machine parallel connection capacity optimum allocation method |
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