CN102223078A - Power electronic transformer aiming at distribution network and control method of power electronic transformer - Google Patents
Power electronic transformer aiming at distribution network and control method of power electronic transformer Download PDFInfo
- Publication number
- CN102223078A CN102223078A CN2011101526951A CN201110152695A CN102223078A CN 102223078 A CN102223078 A CN 102223078A CN 2011101526951 A CN2011101526951 A CN 2011101526951A CN 201110152695 A CN201110152695 A CN 201110152695A CN 102223078 A CN102223078 A CN 102223078A
- Authority
- CN
- China
- Prior art keywords
- voltage
- power
- electric
- transformer
- electronic transformer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Inverter Devices (AREA)
- Ac-Ac Conversion (AREA)
Abstract
The invention discloses a power electronic transformer (PET) aiming at a distribution network in the field of power electronics and a control method of the power electronic transformer. The power electronic transformer comprises an input stage, an isolation stage and an output stage; and sine primary current and constant secondary load voltage are realized by the primary tri-level rectifier circuit of the power electronic transformer, the voltage change and the energy transfer of the high-frequency transformer of the isolation stage and stable direct-current side low-voltage inversion. The invention has the advantages that: the power electronic transformer has small volume, is light and pollution-free and can guarantee that the primary current is controllable and power factor is adjustable; the power electronic transformer can transfer active power to a load and also inject reactive power into a power grid to supply reactive power to the power grid.
Description
Technical field
The invention belongs to electric and electronic technical field, relate in particular to a kind of electric power electric transformer and control method thereof at power distribution network.
Background technology
Traditional power transformer is always as the main tool of transformation and isolation and extensive use in electrical network, and its manufacture craft is simple, the reliability height.But its shortcoming is fairly obvious, and volume, weight, no-load loss are big, and transformer oil exists environment and threatens; Harmonic wave can be produced during core sataration, when dropping into electrical network, also bigger magnetizing inrush current can be caused.During the band nonlinear-load, distortion current causes the harmonic pollution to electrical network by the transformer coupled electrical network that enters; When mains side voltage is interfered, can be delivered to load-side again, produce voltage flicker, even cause influence sensitive load.
Along with the development of high-power electric and electronic technology, electric power electric transformer PET (Power Electronic Transformer) as a kind of novel voltage transformation, energy delivery electrical equipment, is just obtaining increasing concern, has broad application prospects.It is changed and controls the energy in the electric power system by power electronic device and electric electronic current change technology, to substitute the conventional electric power transformer in the distribution system.
Summary of the invention
, weight big at traditional power transformer volume of mentioning in the above-mentioned background technology is big, there are deficiencies such as threat in transformer oil to environment, the present invention proposes a kind of electric power electric transformer and control method thereof at power distribution network.
Technical scheme of the present invention is that a kind of electric power electric transformer at power distribution network is characterized in that this electric power electric transformer comprises input stage, isolation level and output stage;
Described input stage is connected with isolation level; Isolation level is connected with output stage;
Described input stage is the tri-level circuit converter;
Described isolation level is the tri-level half-bridge straight convertor;
Described output stage is two level voltage type inverters.
A kind of control method of the electric power electric transformer at power distribution network is characterized in that this method may further comprise the steps:
Step 1: voltage and the inductive current of gathering input stage net side;
Step 2: the collection capacity of step 1 is delivered to input stage, obtain high direct voltage through adjusting;
Step 3: filter inductance electric current and the output capacitance voltage of gathering isolation level;
Step 4: the high direct voltage of step 2 and the collection capacity of step 3 are input to isolation level, obtain stabilizing low voltage through adjusting;
Step 5: the load three-phase voltage of gathering output stage;
Step 6: the stabilizing low voltage of step 4 and the collection capacity of step 5 are input to output stage, obtain the constant voltage of load-side, the alternating voltage of constant frequency through adjusting.
Described input stage adopts voltage and current double closed-loop control.
Described isolation level adopts the electric current and voltage closed-loop control.
Described output stage adopts the electric current and voltage closed-loop control.
The present invention adopts high frequency transformer, and volume is little, in light weight, pollution-free; Can guarantee former side's controlled current, power factor is adjustable; Load side voltage is constant, not with load variations; Device for high-power power electronic can instantaneous (us level) turn-off the big electric current of fault.What it was the most outstanding is exactly that its primary current, secondary voltage and power factor are controlled.
Description of drawings
Fig. 1 is an electric power electric transformer system construction drawing in the embodiment of the invention;
Fig. 2 is input stage three level rectifier control principle figure in the embodiment of the invention;
Fig. 3 is an isolation level convertor controls schematic diagram in the embodiment of the invention;
Fig. 4 is load-side inverter control principle figure in the embodiment of the invention;
Fig. 5 is electric power electric transformer control simulation result figure in the embodiment of the invention;
Figure a is the three-phase phase voltage of input stage net side; Figure b is the three-phase input current of input stage net side; Figure c is the high-pressure side direct voltage; Figure d is the reactive power that electric power electric transformer PET absorbs from electrical network; Figure e is former side's high frequency square wave; Figure f is the waveform of former side's high frequency square wave after the high frequency transformer conversion; Figure g obtains stable DC voltage for the low-voltage direct side; Figure h is the load-side burning voltage; Figure i is the load three-phase current.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment is elaborated.Should be emphasized that following explanation only is exemplary, rather than in order to limit the scope of the invention and to use.
Below in conjunction with accompanying drawing principle of the present invention and concrete execution mode are described.
The electric power electric transformer PET (Power Electronic Transformer) that uses at power distribution network as shown in Figure 1.Wherein, input stage is the tri-level circuit converter; Isolation level is the tri-level half-bridge straight convertor; Output stage is two level voltage type inverters.
Fig. 2 is the control principle figure of the input stage of electric power electric transformer PET.Input stage adopts voltage and current double closed-loop control.
Gather electric power electric transformer PET input stage voltage on line side and three-phase input current, control input stage, to realize the high-pressure side direct voltage by the voltage and current double closed-loop control method.
In the outer voltage, the direct voltage of feedback and given voltage reference value relatively back form deviation, and via controller is regulated the back as d axle reference current d
*Output; The current reference value q of q shaft current
*Put 0, the power factor operation of tri-level circuit converter office;
In the current inner loop, the three-phase input current of collection forms d axle and q axle component through coordinate transform, respectively with d
*, q
*Relatively, after the controller adjusting, form modulation wave signal, modulation wave signal forms tri-level circuit converter pulses signal through modulation.
Fig. 3 is the control principle figure of the isolation level of electric power electric transformer PET.Isolation level adopts the electric current and voltage closed-loop control.
Gather output stage capacitance voltage V
0, filter inductance current instantaneous value I
Lf, adopt the electric current and voltage closed loop control method to obtain stabilizing low voltage, i.e. the low-pressure side direct voltage.In the outer voltage, output stage capacitance voltage V
0With reference voltage signal V
0 *Compare, the deviation signal of gained is regulated the current reference set-point I of back as current inner loop through controller
Lf *High frequency transformer secondary inductance current instantaneous value I
LfWith the given reference value I of electric current
Lf *Relatively, obtain the control signal of isolation level tri-level half-bridge switching device after via controller is regulated.
Fig. 4 is the control principle figure of the output stage of electric power electric transformer PET.Output stage adopts the electric current and voltage closed-loop control.
Gather the load three-phase voltage, adopt constant voltage, constant frequency control, steady load voltage and frequency.The three-phase voltage of gathering obtains d axle component Ud and q axle component Uq after through the conversion of d-q rotating coordinate system, they respectively with separately reference value Ud
*, Uq
*Relatively, form modulation wave signal through behind the adjuster, modulation wave signal is through the alternating voltage of modulation formation constant voltage, constant frequency, i.e. two level voltage type inverter pulse signals.
10 kilovolt/380 volt electric power electric transformer PET system model steady state operating condition figures of Fig. 5 for setting up, wherein input stage direct voltage reference value is set 15 kilovolts, isolation level output current voltage reference value is set at 600 volts, high frequency transformer no-load voltage ratio 10: 1, load three-phase voltage reference value is set at 380 volts.System injects to electrical network and idlely is set at 100 kilovars, has 40 kilowatts of workloads, 50 hertz of frequencies.
In the input stage of electric power electric transformer PET, net side input voltage input current obtains high pressure through the tri-level circuit converter on dc bus capacitor, but the flexible power factor.Fig. 5 a is the three-phase phase voltage of input stage net side; Fig. 5 b is the three-phase input current of input stage net side, realizes the input current sineization; Fig. 5 c mesohigh side direct voltage is 15 kilovolts, reaches the expection controlled target; Fig. 5 d reactive power-100 that to be PET absorb from electrical network kilovar, promptly to electrical network inject 100 kilovars idle, flexible transmission is meritorious idle.
In the isolation level of electric power electric transformer PET, isolation level tri-level half-bridge converter is modulated into former side's high frequency square wave with the input stage high direct voltage, shown in Fig. 5 e.Former side's high frequency square wave is changed through high frequency transformer, shown in Fig. 5 f.The isolation level straight convertor obtains 600 volts of outputs of stable DC voltage in the low-voltage direct side, shown in Fig. 5 g by control.
In the output stage of electric power electric transformer PET, dc low-voltage adopts voltage constant control through two level voltage type inverters, obtains burning voltage in load-side.The load three-phase voltage is 380 volts among Fig. 5 h, reaches expection control.Fig. 5 i is the load three-phase current.
Fig. 5 shows: this electric power electric transformer PET system has realized the input current sine, load-side constant voltage, constant frequency, and sent need idle to electrical network, power controlled has superiority than traditional transformer.
Control method concrete steps of the present invention are as follows:
Step 1: voltage and the inductive current of gathering input stage net side;
Step 2: the collection capacity of step 1 is delivered to input stage, obtain high direct voltage through adjusting;
Step 3: filter inductance electric current and the output capacitance voltage of gathering isolation level;
Step 4: the high direct voltage of step 2 and the collection capacity of step 3 are input to isolation level, obtain stabilizing low voltage through adjusting;
Step 5: the load three-phase voltage of gathering output stage;
Step 6: the stabilizing low voltage of step 4 and the collection capacity of step 5 are input to output stage, obtain the constant voltage of load-side, the alternating voltage of constant frequency through adjusting.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (5)
1. the electric power electric transformer at power distribution network is characterized in that this electric power electric transformer comprises input stage, isolation level and output stage;
Described input stage is connected with isolation level; Isolation level is connected with output stage;
Described input stage is the tri-level circuit converter;
Described isolation level is the tri-level half-bridge straight convertor;
Described output stage is two level voltage type inverters.
2. control method at the electric power electric transformer of power distribution network is characterized in that this method may further comprise the steps:
Step 1: voltage and the inductive current of gathering input stage net side;
Step 2: the collection capacity of step 1 is delivered to input stage, obtain high direct voltage through adjusting;
Step 3: filter inductance electric current and the output capacitance voltage of gathering isolation level;
Step 4: the high direct voltage of step 2 and the collection capacity of step 3 are input to isolation level, obtain stabilizing low voltage through adjusting;
Step 5: the load three-phase voltage of gathering output stage;
Step 6: the stabilizing low voltage of step 4 and the collection capacity of step 5 are input to output stage, obtain the constant voltage of load-side, the alternating voltage of constant frequency through adjusting.
3. the control method of a kind of electric power electric transformer at power distribution network according to claim 2 is characterized in that described input stage adopts voltage and current double closed-loop control.
4. the control method of a kind of electric power electric transformer at power distribution network according to claim 2 is characterized in that described isolation level adopts the electric current and voltage closed-loop control.
5. the control method of a kind of electric power electric transformer at power distribution network according to claim 2 is characterized in that described output stage adopts the electric current and voltage closed-loop control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101526951A CN102223078A (en) | 2011-06-08 | 2011-06-08 | Power electronic transformer aiming at distribution network and control method of power electronic transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101526951A CN102223078A (en) | 2011-06-08 | 2011-06-08 | Power electronic transformer aiming at distribution network and control method of power electronic transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102223078A true CN102223078A (en) | 2011-10-19 |
Family
ID=44779526
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101526951A Pending CN102223078A (en) | 2011-06-08 | 2011-06-08 | Power electronic transformer aiming at distribution network and control method of power electronic transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102223078A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102710156A (en) * | 2012-06-11 | 2012-10-03 | 清华大学 | Input-stage circuit for intelligent transformer |
| CN102780400A (en) * | 2012-06-11 | 2012-11-14 | 清华大学 | Isolation level circuit for smart transformer |
| CN103259445A (en) * | 2012-02-16 | 2013-08-21 | 阳光电源股份有限公司 | Inverter power source device |
| CN104600813A (en) * | 2015-02-11 | 2015-05-06 | 南京矽力杰半导体技术有限公司 | Adaptive input current limitation charger and control method thereof |
| CN104868762A (en) * | 2015-06-04 | 2015-08-26 | 广西电网有限责任公司电力科学研究院 | DES (distributed energy storage) power electronic transformer, and control method therefor |
| CN106992546A (en) * | 2017-05-10 | 2017-07-28 | 三峡大学 | A kind of optimal energy allocation system of flexible direct current power distribution network |
| CN110165898A (en) * | 2019-05-29 | 2019-08-23 | 河北工程大学 | A kind of electric power electric transformer energy flow control method and system |
| CN110445389A (en) * | 2019-07-16 | 2019-11-12 | 上海交通大学 | The solid-state transformer device and its control method for having true bipolar low-pressure DC port |
| CN110442042A (en) * | 2019-08-13 | 2019-11-12 | 华北电力大学 | Electric car accesses electric power electric transformer number physical mixed real-time emulation system |
| CN110912428A (en) * | 2019-11-14 | 2020-03-24 | 东北大学 | Multi-output multi-voltage grade-transplantable multilevel power electronic converter topological structure |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101494425A (en) * | 2009-01-19 | 2009-07-29 | 上海海事大学 | Three-phase mixing multi-level inverter circuit |
| CN101572495A (en) * | 2009-03-10 | 2009-11-04 | 东南大学 | Multifunctional power electric transformer |
| CN201369679Y (en) * | 2009-03-10 | 2009-12-23 | 东南大学 | Electronic transformer for electric power line |
| CN101621254A (en) * | 2009-08-06 | 2010-01-06 | 东南大学 | Power electronic transformer applied to distribution network |
| CN101795080A (en) * | 2010-03-03 | 2010-08-04 | 中国科学院电工研究所 | Three-phase power electronics transformer for power distribution |
| CN102064712A (en) * | 2010-12-24 | 2011-05-18 | 东南大学 | Power electronic transformer based on simple PFC (Power Factor Correction) |
-
2011
- 2011-06-08 CN CN2011101526951A patent/CN102223078A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101494425A (en) * | 2009-01-19 | 2009-07-29 | 上海海事大学 | Three-phase mixing multi-level inverter circuit |
| CN101572495A (en) * | 2009-03-10 | 2009-11-04 | 东南大学 | Multifunctional power electric transformer |
| CN201369679Y (en) * | 2009-03-10 | 2009-12-23 | 东南大学 | Electronic transformer for electric power line |
| CN101621254A (en) * | 2009-08-06 | 2010-01-06 | 东南大学 | Power electronic transformer applied to distribution network |
| CN101795080A (en) * | 2010-03-03 | 2010-08-04 | 中国科学院电工研究所 | Three-phase power electronics transformer for power distribution |
| CN102064712A (en) * | 2010-12-24 | 2011-05-18 | 东南大学 | Power electronic transformer based on simple PFC (Power Factor Correction) |
Non-Patent Citations (1)
| Title |
|---|
| 王丹等: "基于电子电力变压器的电能质量调节方法", 《高电压技术》, vol. 31, no. 08, 31 August 2005 (2005-08-31) * |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103259445A (en) * | 2012-02-16 | 2013-08-21 | 阳光电源股份有限公司 | Inverter power source device |
| CN102710156A (en) * | 2012-06-11 | 2012-10-03 | 清华大学 | Input-stage circuit for intelligent transformer |
| CN102780400A (en) * | 2012-06-11 | 2012-11-14 | 清华大学 | Isolation level circuit for smart transformer |
| US10128679B2 (en) | 2015-02-11 | 2018-11-13 | Silergy Semiconductor Technology (Hangzhou) Ltd | Adaptive charger with input current limitation and controlling method for the same |
| CN104600813A (en) * | 2015-02-11 | 2015-05-06 | 南京矽力杰半导体技术有限公司 | Adaptive input current limitation charger and control method thereof |
| US10951050B2 (en) | 2015-02-11 | 2021-03-16 | Silergy Semiconductor Technology (Hangzhou) Ltd | Adaptive charger with input current limitation and controlling method for the same |
| CN104868762A (en) * | 2015-06-04 | 2015-08-26 | 广西电网有限责任公司电力科学研究院 | DES (distributed energy storage) power electronic transformer, and control method therefor |
| CN106992546A (en) * | 2017-05-10 | 2017-07-28 | 三峡大学 | A kind of optimal energy allocation system of flexible direct current power distribution network |
| CN110165898A (en) * | 2019-05-29 | 2019-08-23 | 河北工程大学 | A kind of electric power electric transformer energy flow control method and system |
| CN110165898B (en) * | 2019-05-29 | 2020-07-10 | 河北工程大学 | Power electronic transformer energy flow control method and system |
| CN110445389A (en) * | 2019-07-16 | 2019-11-12 | 上海交通大学 | The solid-state transformer device and its control method for having true bipolar low-pressure DC port |
| CN110442042A (en) * | 2019-08-13 | 2019-11-12 | 华北电力大学 | Electric car accesses electric power electric transformer number physical mixed real-time emulation system |
| CN110442042B (en) * | 2019-08-13 | 2021-01-15 | 华北电力大学 | Digital physical hybrid real-time simulation system for electric vehicle to be connected with power electronic transformer |
| CN110912428A (en) * | 2019-11-14 | 2020-03-24 | 东北大学 | Multi-output multi-voltage grade-transplantable multilevel power electronic converter topological structure |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102223078A (en) | Power electronic transformer aiming at distribution network and control method of power electronic transformer | |
| CN108111030B (en) | Hybrid offshore wind field direct current converter | |
| CN102157956B (en) | Virtual-impedance-based inverter parallel running method | |
| US9859714B2 (en) | Multiple input three-phase inverter with independent MPPT and high efficiency | |
| CN102255586B (en) | Constant power wide speed regulation control method for permanent magnet synchronous motor | |
| CN103107551B (en) | Topology circuit used for offshore wind power electric energy delivery | |
| CN104953605A (en) | Interphase unbalance management circuit, system and method for three-phase network | |
| CN202488205U (en) | Novel serial-parallel conversion-type UPS | |
| CN104377699A (en) | Hybrid induction type active power filter and reactive compensation system and method for wind power plant | |
| CN103311951B (en) | Wind power plant power transmission method based on voltage transformation of middle frequency or high frequency transformer | |
| CN103094918B (en) | A kind of single-phase grid-connected device improving the quality of power supply | |
| CN106602918A (en) | 32KV electron gun pulse modulation power supply | |
| CN114123268A (en) | Concentrated conversion high-frequency boosting thermal power energy storage system | |
| CN105305853A (en) | Multi-pulse wave rectifier using active power factor correction technology and design method thereof | |
| CN105958808A (en) | Control method of photovoltaic grid-connected inverter | |
| CN105071416A (en) | Subsynchronous oscillation inhibition apparatus and method for inhibiting flickering of power network | |
| CN204928177U (en) | Subsynchronous oscillation suppression device who restraines electric wire netting flickering | |
| CN205141694U (en) | Circuit is administered to alternate disequilibrium of three -phase grid | |
| CN101795004A (en) | Alternating current active power factor correction compensation circuit | |
| Yan et al. | An efficient isolated bi-directional half bridge resonant DC/DC converter | |
| CN203827195U (en) | Single phase power electronic transformer | |
| Yaqoob et al. | Photovoltaic flyback micro-inverter with power decoupling | |
| CN204928171U (en) | Idle generating device of subharmonic | |
| Meral | Using active power factor correction (PFC) boost rectifiers for an improved topology of static series compensators with no energy storage | |
| CN109921450A (en) | A kind of four end VSC-MTDC containing wind-powered electricity generation and DC-DC energy-storage system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20111019 |