CN208369219U - A kind of cascade connection multi-level dynamic electric voltage recovery device - Google Patents
A kind of cascade connection multi-level dynamic electric voltage recovery device Download PDFInfo
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- CN208369219U CN208369219U CN201820138092.3U CN201820138092U CN208369219U CN 208369219 U CN208369219 U CN 208369219U CN 201820138092 U CN201820138092 U CN 201820138092U CN 208369219 U CN208369219 U CN 208369219U
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- phase
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- filter
- coupling transformer
- side winding
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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
Abstract
The utility model relates to a kind of cascade connection multi-level dynamic electric voltage recovery devices, are related to a kind of device compensated for Voltage Drop.A phase cascaded H-bridges inverter output end is connect with a phase LC filter, and the capacitor of a phase LC filter and a primary side winding of coupling transformer that is connected in series are in parallel, and the be connected in series vice-side winding of coupling transformer of a is connected between power grid and load；B phase cascaded H-bridges inverter output end is connect with b phase LC filter, and the capacitor of b phase LC filter and the b primary side winding of coupling transformer that is connected in series are in parallel, and the be connected in series vice-side winding of coupling transformer of b is connected between power grid and load；C phase cascaded H-bridges inverter output end is connect with c phase LC filter, and the capacitor of c phase LC filter and the c primary side winding of coupling transformer that is connected in series are in parallel, and the be connected in series vice-side winding of coupling transformer of c is connected between power grid and load.Advantage is that control is simple, and harmonic wave of output voltage is few, is conveniently replaceable.
Description
Technical field
The utility model relates to a kind of devices compensated for Voltage Drop, refer in particular to a kind of dynamic electric voltage recovery
Device.
Background technique
Dynamic electric voltage recovery device, which is connected between power supply and load, is equivalent to a controlled voltage source, it passes through injection one
Voltage compensates the part of falling of supply voltage, and maintains the sensitive loads not influenced by Voltage Drop.
Dynamic electric voltage recovery device main circuit is mainly by: DC energy storage unit, voltage source inverter, output filter branch, coupling
It closes unit and by-pass switch system forms.Dynamic electric voltage recovery device detects network voltage in real time, when the network voltage detected
When being distorted, control unit calculates the voltage for needing to compensate according to the voltage characteristic meter after falling, and will by inverter
DC energy storage unit voltage is converted into the controllable alternating voltage of amplitude, phase, and passes through output filter branch and series transformer
It is injected into system, the superimposed completion of voltage fallen with system compensates.Therefore, as viewed from load side, supply voltage is not
Excessive disturbance occurs, therefore dynamic electric voltage recovery device can greatly improve the power supply reliability and power supply quality of sensitive load, guarantee
The normal operation of sensitive load.
When dynamic electric voltage recovery device is used for high-power occasion, due to being limited by all many conditions, inverter topology
Structure is mostly more level blocks.In diode-clamped multi-electrical level inverter, striding capacitance Clamp multi-electrical level inverter, directly
The voltage-sharing that stream surveys capacitance voltage is difficult to overcome, and can only solve this problem with system optimizing control.
Summary of the invention
The utility model provides a kind of cascade connection multi-level dynamic electric voltage recovery device, is applied to high-power occasion, with
Offset voltage is fallen.
The technical scheme adopted by the utility model is that:
A phase cascaded H-bridges inverter output end is connect with a phase LC filter, and the capacitor C1 and a of a phase LC filter is connected in series
The primary side winding of coupling transformer is in parallel, and the be connected in series vice-side winding of coupling transformer of a is connected between power grid and load；
B phase cascaded H-bridges inverter output end is connect with b phase LC filter, and the capacitor C2 and b of b phase LC filter is connected in series
The primary side winding of coupling transformer is in parallel, and the be connected in series vice-side winding of coupling transformer of b is connected between power grid and load；
C phase cascaded H-bridges inverter output end is connect with c phase LC filter, and the capacitor C3 and c of c phase LC filter is connected in series
The primary side winding of coupling transformer is in parallel, and the be connected in series vice-side winding of coupling transformer of c is connected between power grid and load,
Each series coupled transformer voltage ratio is 2:1.
The a phase Cascade H bridge inverter, b phase Cascade H bridge inverter are identical with c phase cascaded H-bridges inverter structure, in which:
The structure of a phase Cascade H bridge inverter is: by H abutment this inversion unit H1, H abutment this inversion unit H2, H abutment
This inversion unit H3, H abutment this inversion unit H4, H this inversion unit of abutment H5 is cascaded, this inversion unit of each H abutment
It is made of 4 power devices and antiparallel diode, each H this inversion unit of abutment has independent energy-storage capacitor.
The utility model has the advantages that structure novel, using cascade connection multi-level inverter structure, step-up transformer coupled modes,
Using the H bridge with independent DC power supply as basic inversion unit, each basic inversion unit is concatenated together, due to each
A inversion unit module is mutually indepedent, does not contact directly between them, therefore voltage-sharing is not present；It is more relative to Clamp
Electrical level inverter control is upper simple many, improves power factor, harmonic wave of output voltage is small；Applied to 10kV voltage class high pressure
Large-power occasions, control is simple, and harmonic wave of output voltage is few；Each inversion unit and driving circuit use modularized encapsulation, knot
Structure is the same, is conveniently replaceable, and brings conveniently to the application in engineering.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model；
Fig. 2 is the circuit diagram of the utility model Cascade H bridge inverter.
Specific embodiment
7 output end of a phase Cascade H bridge inverter is connect with a phase LC filter 4, and the capacitor C1 and a phase of a phase LC filter 4 is gone here and there
The primary side winding for joining coupling transformer 1 is in parallel, and the be connected in series vice-side winding of coupling transformer 1 of a is connected between power grid and load；
8 output end of b phase Cascade H bridge inverter is connect with b phase LC filter 5, and the capacitor C2 and b phase of b phase LC filter 5 is gone here and there
The primary side winding for joining coupling transformer 2 is in parallel, and the be connected in series vice-side winding of coupling transformer 2 of b is connected between power grid and load；
9 output end of c phase Cascade H bridge inverter is connect with c phase LC filter 6, and the capacitor C3 and c phase of c phase LC filter 6 is gone here and there
The primary side winding for joining coupling transformer 3 is in parallel, and the be connected in series vice-side winding of coupling transformer 3 of c is connected between power grid and load,
Each series coupled transformer voltage ratio is 2:1.
The a phase Cascade H bridge inverter 7, b phase Cascade H bridge inverter 8 and c phase Cascade H 9 structures of bridge inverter are identical,
In:
The structure of a phase Cascade H bridge inverter 7 is: by H abutment this inversion unit H1, H abutment this inversion unit H2, H abutment
This inversion unit H3, H abutment this inversion unit H4, H this inversion unit of abutment H5 is cascaded, this inversion unit of each H abutment
It is made of 4 power devices and antiparallel diode, each H this inversion unit of abutment has independent energy-storage capacitor.
Cascade H bridge inverter is required DC inverter according to control into the alternating current of required amplitude and phase；Cascade H
Bridge inverter output port installs LC filter, the design principle of LC filter be biggish decaying is generated to higher hamonic wave, but
It is as small as possible to the decaying of low frequency (especially 50Hz frequency), select 0.126mH inductance, 200 μ F capacitors, the resonance of LC filter
Frequency can produce 100 times of decaying in 1kHz or so, to 10kHz harmonic wave；The capacitor of LC filter and series coupled transformer
Primary side is in parallel, and the cascaded H-bridges inverter output voltage for filtering higher hamonic wave is coupled to transformer secondary winding, coupling transformer
Vice-side winding is connected between power grid and load 10, and secondary voltage is added in load after being superimposed with network voltage, compensates power grid
Voltage falls part, and load is maintained not influenced by Voltage Drop；Coupling transformer no-load voltage ratio is 2:1, is reduced to inverter
The requirement of DC voltage；The requirement to the stress levels of controllable devices is reduced, cascade basic inversion unit is decreased
Number, it is easy to accomplish to keep output voltage wave modulation simple；
Each H this inversion unit of abutment is made of 4 power devices and antiparallel diode, and power device selects Mitsubishi
The IGBT of company, voltage rating 1200V, each H this inversion unit of abutment has independent energy-storage capacitor, due to dynamic electric voltage
Restorer is applied to 10kV voltage class high-power occasion, need to compensate 40% Voltage Drop, and the former secondary side of series transformer becomes
Than for 2:1, DC bus-bar voltage is set to 500V, and each H this inversion unit of abutment and driving circuit use modularized encapsulation,
Structure is the same, is conveniently replaceable, and brings conveniently to the application in engineering.
Claims (3)
1. a kind of cascade connection multi-level dynamic electric voltage recovery device, it is characterised in that: a phase cascaded H-bridges inverter output end and a phase LC
Filter connection, the capacitor C1 and a of a phase LC filter are connected in series, and the primary side winding of coupling transformer is in parallel, and a is connected in series to couple becomes
The vice-side winding of depressor is connected between power grid and load；B phase cascaded H-bridges inverter output end is connect with b phase LC filter, b
The capacitor C2 and b of phase LC the filter primary side winding of coupling transformer that is connected in series are in parallel, b be connected in series coupling transformer secondary side around
Group is connected between power grid and load；C phase cascaded H-bridges inverter output end is connect with c phase LC filter, c phase LC filter
Capacitor C3 and the c primary side winding of coupling transformer that is connected in series are in parallel, and the be connected in series vice-side winding of coupling transformer of c is connected on power grid
Between load.
2. a kind of cascade connection multi-level dynamic electric voltage recovery device according to claim 1, it is characterised in that: each series connection
Coupling transformer no-load voltage ratio is 2:1.
3. a kind of cascade connection multi-level dynamic electric voltage recovery device according to claim 1, it is characterised in that: a phase grade
It is identical with c phase cascaded H-bridges inverter structure to join H bridge inverter, b phase Cascade H bridge inverter, in which: a phase Cascade H bridge inverter
Structure be: by this inversion of H abutment this inversion unit H1, H abutment this inversion unit H2, H abutment this inversion unit H3, H abutment
Unit H4, H this inversion unit of abutment H5 is cascaded, and each H this inversion unit of abutment is by 4 power devices and antiparallel two
Pole pipe is constituted, and each H this inversion unit of abutment has independent energy-storage capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820138092.3U CN208369219U (en) | 2018-01-26 | 2018-01-26 | A kind of cascade connection multi-level dynamic electric voltage recovery device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820138092.3U CN208369219U (en) | 2018-01-26 | 2018-01-26 | A kind of cascade connection multi-level dynamic electric voltage recovery device |
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| Publication Number | Publication Date |
|---|---|
| CN208369219U true CN208369219U (en) | 2019-01-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820138092.3U Expired - Fee Related CN208369219U (en) | 2018-01-26 | 2018-01-26 | A kind of cascade connection multi-level dynamic electric voltage recovery device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111106609A (en) * | 2020-02-06 | 2020-05-05 | 云南电网有限责任公司电力科学研究院 | Phase voltage drop calculation method for self-produced power supply |
-
2018
- 2018-01-26 CN CN201820138092.3U patent/CN208369219U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111106609A (en) * | 2020-02-06 | 2020-05-05 | 云南电网有限责任公司电力科学研究院 | Phase voltage drop calculation method for self-produced power supply |
| CN111106609B (en) * | 2020-02-06 | 2023-09-22 | 云南电网有限责任公司电力科学研究院 | Self-generated power supply phase voltage drop calculation method |
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Granted publication date: 20190111 Termination date: 20200126 |