CN207200284U - A kind of seven level dynamic voltage recovery devices based on active-clamp current transformer - Google Patents
A kind of seven level dynamic voltage recovery devices based on active-clamp current transformer Download PDFInfo
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- CN207200284U CN207200284U CN201721129656.9U CN201721129656U CN207200284U CN 207200284 U CN207200284 U CN 207200284U CN 201721129656 U CN201721129656 U CN 201721129656U CN 207200284 U CN207200284 U CN 207200284U
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- 238000011084 recovery Methods 0.000 title claims abstract description 25
- 239000003990 capacitor Substances 0.000 claims abstract description 17
- 238000004146 energy storage Methods 0.000 claims abstract description 16
- 230000008878 coupling Effects 0.000 claims abstract description 15
- 238000010168 coupling process Methods 0.000 claims abstract description 15
- 238000005859 coupling reaction Methods 0.000 claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 7
- 238000001914 filtration Methods 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims description 3
- 238000013459 approach Methods 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 238000009826 distribution Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000010181 polygamy Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
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Abstract
The utility model discloses a kind of seven level dynamic voltage recovery devices based on active-clamp current transformer, including 10kV/380V transformers, soft unit, the first wave filter, rectification unit, energy storage inversion unit, the second wave filter, coupling transformer, bypass breaker and detection control unit.It is connected between rectification unit and 10kV power networks by 10kV/380V transformers, soft unit and the first wave filter, the whole DC voltage obtained charges to the DC capacitor of energy storage inversion unit；DC capacitor is three electric capacity cascaded structures, and energy is provided for seven level active neutral-point-clamped current transformers of energy storage inversion unit；Seven level active neutral-point-clamped current transformers produce offset voltage by the inversion to DC voltage, and offset voltage passes through the second filter filtering, and filtered offset voltage is coupled to three-phase 10kV power networks by coupling transformer, and coupling transformer is in parallel with bypass breaker；Rectification unit and seven level active neutral-point-clamped current transformers are respectively connected with the modulated signal for being used to adjust output voltage of detection control unit output.
Description
Technical field
The utility model discloses a kind of seven level dynamic voltage recovery devices based on active-clamp current transformer, belong to
10kV electrical equipment technical fields.
Background technology
To meet that Industry Structure upgrades the requirement to 10kV distribution quality of voltage, ensure high and new technology equipment numerical control machine
The sensitive loads such as bed are safely and efficiently run, and improve 10Kv distributions quality of voltage has turned into the emphasis of power supply department work.Dynamically
Voltage recovery device (Dynamic Voltage Restorer, DVR) is used as a kind of serially connected electrical energy quality compensation device, with it
The features such as operational efficiency is high, dynamic property is good and real-Time Compensation ability is strong, be guarantee quality of voltage at present effective means it
One.
Dynamic electric voltage recovery device improves output voltage waveforms, typically can all use more level to improve compensation range
Structure.Traditional cascaded multilevel structure easily coordinates because each module DC bus capacitor is independent with rectification unit, extensively should
For in more level dynamic voltage recovery devices.But cascading multiple electrical level structure, output voltage often improve two level, just must
Palpus one rectification unit of polygamy, rectification unit can be diode uncontrollable rectifier or IGBT full-control type rectifications, and economic benefit is low, control
System complex processed.
Inversion unit of the active-clamp current transformer as dynamic electric voltage recovery device is studied, is improving inverter output level
While number is 7, a rectification unit is only needed per phase, reduces rectification unit number, simplifies the design and control of rectification unit
System, improve the economic benefit of dynamic electric voltage recovery device.
Utility model content
Technical problem：The utility model provides a kind of seven level dynamic voltages based on active-clamp current transformer and recovers dress
Put, the purpose is to solve current cascading multiple electrical level dynamic electric voltage recovery device, output voltage often improves two level numbers, just must
Must one rectification unit of polygamy, the problem of economic benefit is low, control system is complicated, dynamic response is not high.
The technical solution of the utility model is as follows：
A kind of seven level dynamic voltage recovery devices based on active-clamp current transformer, including rectification unit, the rectification
It is connected between unit 4 and 10kV power networks by 10kV/380V transformers 1, the soft wave filter 3 of unit 2 and first, the whole direct current obtained
Voltage charges to the DC capacitor of energy storage inversion unit 5；The DC capacitor is three electric capacity cascaded structures, is energy storage inversion unit
5 seven level active neutral-point-clamped current transformers provide energy；The seven level actives neutral-point-clamped current transformer passes through to direct current
The inversion of pressure produces offset voltage, and offset voltage filters by the second wave filter 6, and filtered offset voltage is by coupling transformation
Device is coupled to three-phase 10kV power networks, and coupling transformer is in parallel with bypass breaker；The level active midpoint of rectification unit 4 and seven
Clamper current transformer is respectively connected with the modulated signal for being used to adjust output voltage of the output of detection control unit 9.
The rectification unit 4 is the three phase full bridge rectification unit of IGBT10 compositions；The rectification unit 4 and three phase network it
Between connected by 10kV/380V transformers 1, soft unit 2 and wave filter 3；The soft unit 2 be resistant series relay it
It is formed in parallel again with relay afterwards；First wave filter 3 is single inductance filter.
The DC capacitor of the energy storage inversion unit 5 is three capacitor bank cascaded structures, series capacitor group it is overall with
The rectification unit 4 is in parallel.
The seven level actives neutral-point-clamped current transformer is made up of 8 IGBT, two half-bridge PEBB (power electronics building blocks
Block) respectively symmetrically it is embedded on the both positive and negative polarity bus of H bridge three-level current transformer H bridges.
The second wave filter 6 has been sequentially connected in series between the seven level actives neutral-point-clamped current transformer and three phase network and has been coupled
Transformer；Second wave filter 6 is LCL filter；The coupling transformer 7 is single-phase transformer；The bypass breaker 8
For 10kV breakers.
The rectification unit 4 uses SPWM modulator approaches；The seven level actives neutral-point-clamped current transformer is adjusted using SVPWM
Method processed.
Beneficial effect
High financial profit：Seven level dynamic voltages provided by the utility model based on active-clamp current transformer recover dress
Put, inverter side uses active-clamp current transformer, when output level number brings up to 7, a rectification unit is only needed per phase, than tradition
The dynamic electric voltage recovery device based on the level of cascade connection type seven, per mutually reducing two rectification units, high financial profit.
Dynamic property is good：Because seven level dynamic voltages provided by the utility model based on active-clamp current transformer recover
Device only needs a rectification unit per phase, and rectification control algolithm is greatly easy, and DC voltage response speed and stability are more preferable.
The offset voltage that dynamic electric voltage recovery device inverter side is sent is influenceed by DC voltage, and DC voltage is more stable, inverter side
The offset voltage waveform sent is also more stable.
Brief description of the drawings
Fig. 1 is seven level dynamic voltage recovery device structural representations of the utility model based on active-clamp current transformer.
Fig. 2 is energy storage inversion unit structural representation in the utility model.
Fig. 3 is active-clamp current transformer working state schematic representation in the utility model.
In figure：1-10kV/380V transformers；Soft unit of 2-；3-the first wave filter；4-- rectification units；5-- energy storage is inverse
Become unit；6-the second wave filter 2；7-- coupling transformers, 8-- bypass breakers；9-- detection control units；10--IGBT.
Specific embodiment
The technical solution of the utility model is described in detail below in conjunction with the accompanying drawings：
Fig. 1 is seven level dynamic voltage recovery device structural representations of the utility model based on active-clamp current transformer.
As shown in figure 1, the seven level dynamic voltage recovery devices of the present utility model based on active-clamp current transformer include 10kV/380V
Transformer 1, soft unit 2, the first wave filter 3, rectification unit 4, energy storage inversion unit 5, coupling transformer 7 and bypass breaker
8.Rectification unit 4 is the three-phase full-bridge rectifier of IGBT10 compositions, by the device of 10kV/380V transformations 1, soft between 10kV power networks
The wave filter 3 of unit 2 and first is played to connect.Wherein, the soft unit 2 that opens is formed in parallel with relay again for resistant series relay, fills
When putting startup, relay in series with a resistor closure, resistance limitation current break, after start-up course terminates, no series resistance
Relay is closed, and resistance is bypassed, and to realize smooth startup, is reduced starting current, is avoided starting overcurrent tripping, plays protection dress
The effect of circuits.First wave filter 3 is an inductance element, plays a part of filtering.Rectification unit is by three-phase alternating current repoussage
Into DC voltage, the DC capacitor to energy storage inversion unit 5 charges, and DC capacitor is three electric capacity cascaded structures.Energy storage inversion list
The active-clamp current transformer of member by the voltage on DC capacitor by being reverse into current 10kV line voltages and normal voltage
Difference, after filtering device 2 filter, filtered offset voltage is coupled to three phase network by coupling transformer.Second wave filter 6
For LCL filter, for reducing the burr of output voltage, play a part of filtering.Coupling transformer 7 is single-phase transformer, coupling
Close in parallel the 10kV bypass breakers for being used for protection device on transformer 7.
Fig. 2 is the energy storage inversion unit structural representation in the utility model.As shown in Fig. 2 the storage in the utility model
Energy inversion unit 5 is seven level active clamping current transformers.Seven level active clamping current transformers are made up of 8 IGBT, two half-bridges
PEBB (power electronics building block) is respectively symmetrically on the both positive and negative polarity bus of embedded H bridge three-level current transformer H bridges.The topology is not only
Meet the working rules of traditional neutral-point-clamped Multilevel Inverters, and commutation and output electricity are completed by the switching network of H bridges
Flat multiplication, therefore the active neutral-point-clamped type current transformer of referred to as seven level H-bridge commutations.
Fig. 3 is active-clamp current transformer working state schematic representation in the utility model.The active-clamp current transformer shares 10
Kind working condition：
State 1：As shown in Fig. 3 (a), switching tube VT3, VT5 are in the conduction state, and other switching tubes are closed,
Output voltage Vo=0；
State 2：As shown in Fig. 3 (b), switching tube VT2, VT4, VT5, VT7 are in the conduction state, and other switching tubes are in and closed
Conjunction state, output voltage Vo=E；
State 3：As shown in Fig. 3 (c), switching tube VT2, VT4, VT5, VT8 are in the conduction state, and other switching tubes are in and closed
Conjunction state, output voltage Vo=2E；
State 4：As shown in Fig. 3 (d), switching tube VT1, VT4, VT5, VT7 are in the conduction state, and other switching tubes are in and closed
Conjunction state, output voltage Vo=2E；
State 5：As shown in Fig. 3 (e), switching tube VT1, VT4, VT5, VT8 are in the conduction state, and other switching tubes are in and closed
Conjunction state, output voltage Vo=3E；
State 6：As shown in Fig. 3 (f), switching tube VT4, VT6 are in the conduction state, and other switching tubes are closed,
Output voltage Vo=0；
State 7：As shown in Fig. 3 (g), switching tube VT2, VT3, VT6, VT7 are in the conduction state, and other switching tubes are in and closed
Conjunction state, output voltage Vo=-E；
State 8：As shown in Fig. 3 (h), switching tube VT2, VT3, VT6, VT8 are in the conduction state, and other switching tubes are in and closed
Conjunction state, output voltage Vo=-2E；
State 9：As shown in Fig. 3 (i), switching tube VT1, VT3, VT6, VT7 are in the conduction state, and other switching tubes are in and closed
Conjunction state, output voltage Vo=-2E；
State 10：As shown in Fig. 3 (j), switching tube VT1, VT3, VT6, VT8 are in the conduction state, and other switching tubes are in
Closure state, output voltage Vo=-3E；
The active-clamp current transformer is modulated by SVPWM, you can 7 level of output, meet that 10kV dynamic electric voltages are extensive
The level demand of apparatus for coating.
Detection control unit 9 mainly has two effects, sends control signal first for the voltage stabilization of rectification unit 4, secondly
Detect current electric grid voltage, load side voltage and dynamic electric voltage recovery device output voltage, by calculate current electric grid voltage with
Difference between normal voltage, generates modulated signal, and modulated signal controls IGBT10 after overdrive circuit (not marked in figure)
Break-make, control active-clamp current transformer send offset voltage, and offset voltage is coupled in line voltage, improves quality of voltage.When
When line voltage falls, the seven level dynamic voltage recovery devices based on active-clamp current transformer send same with line voltage
The offset voltage of phase, the two addition, load voltage is set to keep normal voltage constant；It is when line voltage rises sharply, based on having
Seven level dynamic voltage recovery devices of source clamping current transformer send the offset voltage anti-phase with line voltage, and the two mutually offsets
Disappear, make load voltage keep normal voltage constant.
Seven level dynamic voltage recovery devices of the utility model based on active-clamp current transformer, for solving line voltage
Temporarily drop, voltage swells or voltage fall for a long time, and its course of work can be divided into two stages.1st, commutation phase：Device is stood after starting
Enter commutation phase, detection control unit 9 exports SPWM modulating waves, control rectification unit 4 gives direct current by closed-loop control
Capacity charge.2nd, the stabilizing compensation stage：After DC capacitor total voltage is increased to 600V, controller control rectification side voltage stabilizing, by direct current
Electric capacity total voltage is stable constant in 600V；Meanwhile controller calculates the difference of 10kV circuits current voltage value and normal voltage, with
And three balance of voltage degree between each electric capacity of capacitor DC energy-storage units, pass through SVPWM selecting switch pipe on off states, control
Active-clamp current transformer produces offset voltage, compensates the difference of current electric grid voltage and normal voltage.When line voltage falls
When falling, the seven level dynamic voltage recovery devices based on active-clamp current transformer send the offset voltage with line voltage with phase,
The two is added, and makes load voltage keep normal voltage constant；It is when line voltage rises sharply, based on active-clamp current transformer
Seven level dynamic voltage recovery devices send the offset voltage anti-phase with line voltage, and the two cancels each other, and protects load voltage
It is constant to hold normal voltage.
The seven level dynamic voltage recovery devices of the present utility model based on active-clamp current transformer are applied to voltage matter
Amount requires higher 10kV distributions, can solve the problem that the problems such as common voltage dip, voltage swells and voltage fall for a long time, improves
Grid voltage quality, ensure that the safe and stable operation of precision equipment.Compared to traditional cascading multiple electrical level dynamic electric voltage
Recovery device, the utility model only need a rectification module while output-voltage levels number is brought up into 7, per phase, simplified
The volume design and control of rectification unit, improve the dynamic property and economy of device.
Claims (10)
1. a kind of seven level dynamic voltage recovery devices based on active-clamp current transformer, it is characterised in that including rectification unit
(4) 10kV/380V transformers (1), soft unit (2) and the first filtering, are passed through between the rectification unit (4) and 10kV power networks
Device (3) is connected, and the whole DC voltage obtained charges to the DC capacitor of energy storage inversion unit (5)；The DC capacitor is three electric capacity
Cascaded structure, energy is provided for seven level active neutral-point-clamped current transformers of energy storage inversion unit (5)；In seven level active
Point clamper current transformer produces offset voltage by the inversion to DC voltage, and offset voltage filters by the second wave filter (6), filter
Offset voltage after ripple is coupled to three-phase 10kV power networks by coupling transformer, and coupling transformer is in parallel with bypass breaker；Institute
State rectification unit (4) and seven level active neutral-point-clamped current transformers are respectively connected with detection control unit (9) output and are used to adjusting
The modulated signal of output voltage.
2. device as claimed in claim 1, it is characterised in that rectification unit (4) is that the three phase full bridge of IGBT (10) compositions is whole
Flow unit；The rectification unit (4) passes through 10kV/380V transformers (1), soft unit (2) and filtering between three phase network
Device (3) connects.
3. device as claimed in claim 1, it is characterised in that the soft unit (2) be resistant series relay after again
It is formed in parallel with relay.
4. device as claimed in claim 1, it is characterised in that first wave filter (3) is single inductance filter.
5. device as claimed in claim 1, it is characterised in that the DC capacitor of the energy storage inversion unit (5) is three electricity
Container group cascaded structure, series capacitor group are overall in parallel with the rectification unit (4).
6. device as claimed in claim 1, it is characterised in that the seven level actives neutral-point-clamped current transformer is by 8 IGBT
(10) form, the both positive and negative polarity that two half-bridge PEBB power electronics building blocks respectively symmetrically are embedded in H bridge three-level current transformer H bridges is female
On line.
7. device as claimed in claim 1, it is characterised in that the seven level actives neutral-point-clamped current transformer and three phase network
Between be sequentially connected in series the second wave filter (6) and coupling transformer.
8. device as claimed in claim 1, it is characterised in that second wave filter (6) is LCL filter.
9. device as claimed in claim 1, it is characterised in that the coupling transformer (7) is single-phase transformer；The bypass
Breaker (8) is 10kV breakers.
10. device as claimed in claim 1, it is characterised in that the rectification unit (4) uses SPWM modulator approaches；It is described
Seven level active neutral-point-clamped current transformers use SVPWM method.
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| CN107453367A (en) * | 2017-09-04 | 2017-12-08 | 国网江苏省电力公司扬州供电公司 | A kind of seven level dynamic voltage recovery devices based on active-clamp current transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107453367A (en) * | 2017-09-04 | 2017-12-08 | 国网江苏省电力公司扬州供电公司 | A kind of seven level dynamic voltage recovery devices based on active-clamp current transformer |
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