CN106300397A - A kind of load unbalanced controlling device of three-phase power - Google Patents
A kind of load unbalanced controlling device of three-phase power Download PDFInfo
- Publication number
- CN106300397A CN106300397A CN201610768702.3A CN201610768702A CN106300397A CN 106300397 A CN106300397 A CN 106300397A CN 201610768702 A CN201610768702 A CN 201610768702A CN 106300397 A CN106300397 A CN 106300397A
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- China
- Prior art keywords
- circuit
- current
- controlling device
- phase
- phase power
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Classifications
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- 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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
-
- 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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Abstract
The invention discloses a kind of load unbalanced controlling device of three-phase power, this device includes one or more change-over circuit being connected in parallel on three-phase alternating current, direct current output interface and exchanges output interface；Change-over circuit includes chopper, current-limiting resistance, catalyst, rectification circuit and inverter circuit, chopper connects the ac bus of distribution transformer low-pressure side, it is connected with chopper after current-limiting resistance and catalyst parallel connection, after current-limiting resistance and catalyst, is sequentially connected with rectification circuit and inverter circuit.The load unbalanced controlling device of three-phase power of the present invention utilizes change-over circuit that three-phase alternating current is rectified into unidirectional current, then by DC inverter be single-phase alternating current be that the single-phase load in electrical network is powered, be inherently eliminated the load unbalanced problem of three-phase power.
Description
Technical field
The present invention relates to field of electrical equipment, the device load unbalanced particularly for administering three-phase power.
Background technology
Low voltage electric network be China town and country common be mixed with three-phase productive power and the supply network of single-phase load electricity consumption.One
In the case of as, low voltage electric network be after 10/0.4kV transformer pressure-reducing in the way of three-phase four-wire system to customer power supply.Power supply
Department is when attaching single-phase load, it should be connected on what single-phase load equalized on A, B, C three-phase.But it is in actual electricity consumption, low
The three-phase power load of voltage electric grid is easy to imbalance occur, and its main cause includes: (1) power supply unit rule to accessing load
Drawing not accurate enough, it is unbalanced that load accesses distribution line；(2) during life-time service, power load is continuously increased, but respectively
Phase power consumption Non-balanced Growth；(3) part power load has seasonality and Temporal changes；(4) power load accesses three-phase
The power factor of circuit is different.The unbalanced electric energy loss not only resulting in circuit and distribution transformer of this three-phase power load
Increase, and can make distribution transforming exert oneself minimizings, distribution transforming produce zero-sequence current increase and each phase voltage inequality.
In prior art, the solution for three-phase load unbalance mainly has: (1) increases the conductor cross-section of zero line, carries
The ability of high uneven power supply；(2) the zero line multipoint earthing in three-phase and four-line；(3) adjust in time according to the change of three-phase load
Each phase load is distributed；(4) single-phase change is used to power.These solutions can only moderate reduction three-phase load unbalance, it is impossible to from
The problem fundamentally solving three-phase load unbalance, lacks motility, the strongest to the change of load and the reply of extension.
Summary of the invention
The technical problem to be solved in the present invention is that in prior art, solution for three-phase load unbalance cannot be from
Fundamentally solve problem, the very flexible of measure itself is the strongest to the change of load and the reply of extension.
For solving above-mentioned technical problem, the technical solution used in the present invention is: the arrival end at low voltage electric network installs three-phase
Electric load imbalance controlling device, this device includes one or more conversion being connected in parallel on three-phase alternating current electricity
Road, direct current output interface and exchange output interface；Change-over circuit includes chopper, current-limiting resistance, catalyst, rectification circuit and inverse
Power transformation road, chopper connects the ac bus of distribution transformer low-pressure side, after current-limiting resistance and catalyst parallel connection with chopper even
Connect, after current-limiting resistance and catalyst, be sequentially connected with rectification circuit and inverter circuit；Direct current output interface is arranged on rectification circuit
Outlet side, exchange output interface is arranged on the outlet side of inverter circuit.
Further, described rectification circuit and inverter circuit are that modular construction, rectification module and inversion module are plugged on
On change-over circuit, the quantity of rectification module and inversion module is one or more, is connected in parallel between each rectification module, each inverse
Become and be connected in parallel between module.
Further, described inverter circuit is provided with reactive power compensation circuit and wave filter.
Further, the load unbalanced controlling device of three-phase power also includes power monitoring equipment, and power monitoring equipment is surveyed
The DC side of amount change-over circuit and the current value of AC, magnitude of voltage, and component temperature value, and will measure and result of calculation biography
It is handed to background client terminal.
Further, the load unbalanced controlling device of three-phase power also includes protection circuit, according to power monitoring equipment
Measurement result, when the fault of stream, overvoltage, under-voltage and excess temperature occurred in circuit, protection circuit interrupts electrical network output.
Beneficial effect: the load unbalanced controlling device of (1) three-phase power of the present invention utilizes change-over circuit by three-phase alternating current
Be rectified into unidirectional current, then by DC inverter be single-phase alternating current be that the single-phase load in electrical network is powered, be inherently eliminated
The load unbalanced problem of three-phase power.(2) in the change-over circuit of the load unbalanced controlling device of three-phase power of the present invention, connection has
Direct current output interface so that electrical network can directly be powered for direct-flow current consumer.(3) the load unbalanced improvement of three-phase power of the present invention
The rectification circuit of device and inverter circuit are modularized design, and between rectification module and inversion module and change-over circuit, plug is even
Connect, easy for installation；In change-over circuit can multiple rectification modules in parallel and inversion module, the redundancy of device is high.(4) present invention three
The inverter circuit of phase electric load imbalance controlling device realizes reactive-load compensation and harmonic filtration.(5) three-phase power of the present invention is born
Lotus imbalance controlling device realizes on-line monitoring function, passes data to background server by communication network, carries out in real time
Monitoring.
Accompanying drawing explanation
Fig. 1 is embodiment 1 three-phase power load unbalanced controlling device application state schematic diagram.
Fig. 2 is the converting circuit structure schematic diagram of embodiment 1.
Fig. 3 is the rectification circuit schematic diagram of embodiment 1.
Fig. 4 is the inverter circuit schematic diagram of embodiment 1.
Fig. 5 is embodiment 1 three-phase power load unbalanced controlling device operation principle block diagram.
Fig. 6 is embodiment 1 three-phase power load unbalanced controlling device workflow diagram.
Detailed description of the invention
With detailed description of the invention, the present invention is described in further detail below in conjunction with the accompanying drawings.
As shown in Figures 1 to 5, the load unbalanced controlling device of the present embodiment three-phase power includes multiple (this quantity foundation
Network load situation determines) change-over circuit that is connected in parallel on three-phase alternating current, direct current output interface with exchange output interface；
Change-over circuit includes chopper, current-limiting resistance, catalyst, rectification circuit and inverter circuit, and chopper is connected to distribution transformer
On the 380V ac bus of low-pressure side, it is connected with chopper after current-limiting resistance and catalyst parallel connection, after current-limiting resistance and catalyst
It is sequentially connected with rectification circuit and inverter circuit.
The load unbalanced controlling device of the present embodiment three-phase power, after close circuit breaker electrifying startup, first passes through current limliting electricity
Hinder and charge to rectification circuit；After being charged to certain level, close catalyst, short circuit current-limiting resistance, inverter circuit work subsequently
Making and export 220V single phase alternating current power supply, three-phase power load unbalanced controlling device workflow is as shown in Figure 6.
Direct current output interface is arranged on the outlet side of rectification circuit, direct current output interface output 400V unidirectional current；Exchange defeated
Outgoing interface is arranged on the outlet side of inverter circuit, exchange output interface output 220V single-phase alternating current.
In order to increase the redundancy of the load unbalanced controlling device of the present embodiment three-phase power, electric company is facilitated to adjust at any time
Whole, rectification circuit and inverter circuit in change-over circuit are designed to modular construction, rectification module and inversion module and are plugged on
On change-over circuit.Multiple rectification module slot being connected in parallel, equally, the base of change-over circuit it is provided with on the substrate of change-over circuit
Multiple inversion module slot being connected in parallel it is also equipped with on plate.
In order to make the present embodiment distribution transformer high and low pressure side have the good quality of power supply, the present embodiment three-phase power is born
It is provided with reactive power compensation circuit and wave filter on the inverter circuit of lotus imbalance controlling device.
The load unbalanced controlling device of three-phase power of the present embodiment realizes system by the controller of power monitoring equipment
Monitoring, power monitoring equipment measures system dc side and the voltage of AC, electric current and temperature, by computational analysis,
When system generation voltage, electric current or temperature anomaly, respective modules is opened from grid disruption, do not affect the work of other modules.
The power monitoring equipment of the load unbalanced controlling device of the present embodiment three-phase power is by measured system dc side
It is transferred to background client terminal with voltage, electric current and the temperature value of AC shown, facilitates administration of power networks personnel to exist in real time
Line monitors.
Although in description being illustrated embodiments of the present invention, but these embodiments are intended only as prompting,
Should not limit protection scope of the present invention.Carry out various omission without departing from the spirit and scope of the present invention, replace and change all
Should comprise within the scope of the present invention.
Claims (5)
1. the load unbalanced controlling device of three-phase power, it is characterised in that: include that one or more is connected in three in parallel
Change-over circuit on cross streams electricity, direct current output interface with exchange output interface；Change-over circuit include chopper, current-limiting resistance,
Catalyst, rectification circuit and inverter circuit, chopper connect distribution transformer low-pressure side ac bus, current-limiting resistance with contact
It is connected with chopper after device parallel connection, after current-limiting resistance and catalyst, is sequentially connected with rectification circuit and inverter circuit；Direct current output connects
Mouth is arranged on the outlet side of rectification circuit, and exchange output interface is arranged on the outlet side of inverter circuit.
The load unbalanced controlling device of three-phase power the most according to claim 1, it is characterised in that: described rectification circuit and
Inverter circuit is that modular construction, rectification module and inversion module are plugged on change-over circuit, rectification module and inversion module
Quantity is one or more, is connected in parallel between each rectification module, is connected in parallel between each inversion module.
3. according to the arbitrary described load unbalanced controlling device of three-phase power of claim 1 or 2, it is characterised in that: described inverse
Power transformation road is provided with reactive power compensation circuit and wave filter.
The load unbalanced controlling device of three-phase power the most according to claim 3, it is characterised in that: also include electric power monitoring
Device, the DC side of power monitoring equipment measurement change-over circuit and the current value of AC, magnitude of voltage, and component temperature value,
And measurement and result of calculation are transferred to background client terminal.
The load unbalanced controlling device of three-phase power the most according to claim 4, it is characterised in that: also include protection electricity
Road, according to the measurement result of power monitoring equipment, when there is the fault of stream, overvoltage, under-voltage and excess temperature in circuit, protection
Circuit Interrupt electrical network exports.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610768702.3A CN106300397A (en) | 2016-08-30 | 2016-08-30 | A kind of load unbalanced controlling device of three-phase power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610768702.3A CN106300397A (en) | 2016-08-30 | 2016-08-30 | A kind of load unbalanced controlling device of three-phase power |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106300397A true CN106300397A (en) | 2017-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610768702.3A Pending CN106300397A (en) | 2016-08-30 | 2016-08-30 | A kind of load unbalanced controlling device of three-phase power |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109921444A (en) * | 2019-03-29 | 2019-06-21 | 西安理工大学 | A kind of power distribution network method of supplying power to and device for eliminating three-phase imbalance |
| CN113224777A (en) * | 2021-06-18 | 2021-08-06 | 广东新电电力科技有限公司 | Three-phase imbalance automatic adjusting platform and method based on MEC |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005348563A (en) * | 2004-06-04 | 2005-12-15 | Sanken Electric Co Ltd | Ac power supply apparatus |
| CN101403780A (en) * | 2008-11-13 | 2009-04-08 | 中国电力科学研究院 | Laboratory test device and method for dynamic electric voltage recovery device |
| CN103475032A (en) * | 2013-10-09 | 2013-12-25 | 国家电网公司 | Intelligent power distribution and utilization flexible control system |
| CN203800608U (en) * | 2014-04-30 | 2014-08-27 | 国家电网公司 | Low-pressure dynamic reactive power compensator |
| US20160065089A1 (en) * | 2014-08-29 | 2016-03-03 | National Tsing Hua University | Three-phase current converter with varied inductances and three-phase d-sigma control method thereof |
| CN206041513U (en) * | 2016-08-30 | 2017-03-22 | 南京相量电气有限公司 | Three -phase power unbalanced load administers device |
-
2016
- 2016-08-30 CN CN201610768702.3A patent/CN106300397A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005348563A (en) * | 2004-06-04 | 2005-12-15 | Sanken Electric Co Ltd | Ac power supply apparatus |
| CN101403780A (en) * | 2008-11-13 | 2009-04-08 | 中国电力科学研究院 | Laboratory test device and method for dynamic electric voltage recovery device |
| CN103475032A (en) * | 2013-10-09 | 2013-12-25 | 国家电网公司 | Intelligent power distribution and utilization flexible control system |
| CN203800608U (en) * | 2014-04-30 | 2014-08-27 | 国家电网公司 | Low-pressure dynamic reactive power compensator |
| US20160065089A1 (en) * | 2014-08-29 | 2016-03-03 | National Tsing Hua University | Three-phase current converter with varied inductances and three-phase d-sigma control method thereof |
| CN206041513U (en) * | 2016-08-30 | 2017-03-22 | 南京相量电气有限公司 | Three -phase power unbalanced load administers device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109921444A (en) * | 2019-03-29 | 2019-06-21 | 西安理工大学 | A kind of power distribution network method of supplying power to and device for eliminating three-phase imbalance |
| CN113224777A (en) * | 2021-06-18 | 2021-08-06 | 广东新电电力科技有限公司 | Three-phase imbalance automatic adjusting platform and method based on MEC |
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