CN107124115A - A kind of method that solid-state transformer starts - Google Patents
A kind of method that solid-state transformer starts Download PDFInfo
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- CN107124115A CN107124115A CN201710458411.9A CN201710458411A CN107124115A CN 107124115 A CN107124115 A CN 107124115A CN 201710458411 A CN201710458411 A CN 201710458411A CN 107124115 A CN107124115 A CN 107124115A
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000000694 effects Effects 0.000 claims description 10
- 230000005611 electricity Effects 0.000 claims description 4
- 239000013307 optical fiber Substances 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 2
- 239000003990 capacitor Substances 0.000 claims 1
- 230000001627 detrimental effect Effects 0.000 abstract description 3
- 230000003116 impacting effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/4807—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode having a high frequency intermediate AC stage
-
- H02J3/383—
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of method that solid-state transformer starts, solid-state transformer high pressure lateral capacitance can be flushed to after rated voltage carry out again it is grid-connected, the steady non-impacting start of solid-state transformer can be achieved, start-up course includes double active bridge operations and high-pressure side is incorporated into the power networks, two links are realized without impact operation, zero dash current can be achieved grid-connected, detrimental impact will not be produced to equipment and power network, whole start-up course will not produce detrimental impact with power network in itself to system, extend the service life of equipment.
Description
Technical field
The invention belongs to electric power electric transformer technical field, it is related to a kind of method that solid-state transformer starts.
Background technology
The present invention relates to the change of electric power electric transformer (PET-PowerElectronic Transformer)/solid-state
Depressor (SST-Solid State Transformer)/electric energy router (EER-Electrical Energy Router) exists
The application in the grid-connected field of high pressure, high pressure photovoltaic combining inverter, alternative biography can be referred to as by being applied to grid-connected field
The grid-connected solution of entirety of system photovoltaic DC-to-AC converter+step-up transformer, with idling consumption is low, system effectiveness is high, intelligent journey
Degree is high, while the advantage such as will not pollute to environment.
Solid-state transformer uses Cascade Topology Structure structure, and module is H bridges+bis- active bridge direct coupled structures.Using low-pressure side simultaneously
Connection, the mode of high-pressure side series connection realizes high pressure direct screening, and the module of solid-state transformer is communicated by optical fiber and master controller.
This cascading topological structure of solid-state transformer is compared similar with flexible DC power transmission and reactive-load compensation SVG.All need
High pressure lateral capacitance is pre-charged.Because flexible DC power transmission and SVG are that module is entered using high-pressure side ac line voltage
Row charging, therefore the grid-connected required capacitance voltage in high-pressure side can not be charged to, it is now grid-connected to have dash current.
The content of the invention
Asked for more than prior art lacking, the present invention provides a kind of method that solid-state transformer starts, realize that solid-state becomes
The steady non-impacting start of depressor, while the start-up course will not also produce impact with power network in itself to system, extends equipment
Service life.
In order to achieve the above object, the present invention uses following scheme：
A kind of method that solid-state transformer starts, solid-state transformer includes 3 phases, per mutually including N number of submodule, submodule by
The direct-connected structure composition of double active bridges and H bridges, each submodule low-pressure side is in parallel, high-pressure side series connection, each module and system master system
Device is by optical fiber connecting communication, per mutually including soft charging resistor, AC circuit breaker QF1, soft contactor KM1 and inductance L；
Photovoltaic array is parallel to solid-state transformer low-pressure side with the one-to-one dc circuit breaker QZ1 that is connected in series through of DC/DC modules,
It is connected after the series inductance L of solid-state transformer high-pressure side with soft charging resistor and soft contactor KM1 in parallel, soft charging electricity
High-voltage fence is accessed by AC circuit breaker QF1 after resistance is in parallel with soft contactor KM1；
The method that solid-state transformer starts is comprised the following steps that：
The first step：Low pressure lateral capacitance Cs of the first closed low side dc circuit breaker QZ1 to each submodule of solid-state transformerL
Charged；
Second step：Closed high top-cross stream circuit breaker Q F1 is high to each submodule by high-tension side soft charging resistor
Press lateral capacitance CHPrecharge, closes soft contactor KM1 after charging complete；
3rd step：Solid-state transformer is set up with master controller per phase submodule and communicated；
4th step：When solid-state transformer low-pressure side voltage reaches startup magnitude of voltage, double active bridge low-pressure sides start small-pulse effect
Give high pressure lateral capacitance CHCharging；
5th step：As high pressure lateral capacitance CHVoltage is charged to after setting value, and double active bridges are entered just by small-pulse effect charge mode
Often hair wave mode, controls high pressure lateral capacitance CHVoltage reaches desired value；
6th step：As high pressure lateral capacitance CHVoltage reaches desired value, and high-pressure side H bridges start to be incorporated into the power networks, now started
Journey terminates.
Further, solid-state transformer is by direct current input module, cascade connection type solid-state transformer module and AC output module group
Into；The DC side parallel multichannel photovoltaic array of the cascade connection type solid-state transformer module, solid-state transformer is divided into three-phase, every mutually to adopt
Power network access by AC output module after being connected with multiple submodule high-pressure side H bridges, AC output module by filter inductance with
A.C. contactor is composed in series；Cascade connection type solid-state transformer submodule is double active by the direct-connected structure composition of double active bridge and H bridges
Bridge is connected to form by two H bridges by high frequency transformer and resonant inductance, a high and low pressure side difference electricity in parallel for double active bridges
Hold..
The beneficial effects of the invention are as follows：
High pressure lateral capacitance can be flushed to after rated voltage by the method that the solid-state transformer of the present invention starts, solid-state transformer
Grid-connected, the steady non-impacting start of achievable solid-state transformer is carried out again, and start-up course includes double active bridges operations and high-pressure side
It is incorporated into the power networks, two links realize that, without impact operation, achievable zero dash current is grid-connected, will not have to equipment and power network
Evil impact, whole start-up course will not produce detrimental impact with power network in itself to system, extend the service life of equipment.
The present invention can solve grid-connected start and impact, and can realize steady charging secondary to high pressure lateral capacitance, it is to avoid double
Electric current is larger when active bridge enters normal hair ripple, extension device service life.
Brief description of the drawings
Fig. 1 is the topological diagram of solid-state transformer；
Fig. 2 is the single module topological diagram of solid-state transformer.
Fig. 3 is double active bridge low-side switch pipe action timing diagrams.
Fig. 4 is double active bridge low-pressure side small-pulse effect charging output voltage waveforms.
Fig. 5 is solid-state transformer start-up course flow chart.
Embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with embodiment, it is clear that described implementation
Example is only a part of embodiment of the invention, rather than whole embodiments.Based on the embodiment in the present invention, the common skill in this area
All other embodiment that art personnel are obtained under the premise of creative work is not made, should all belong to the model that the present invention is protected
Enclose.
The solid-state transformer that the present invention is mentioned is applied to the topological structure of photovoltaic generating system by direct current input module, cascade
Type solid-state transformer module, AC output module composition, the DC side parallel multichannel light of the cascade connection type solid-state transformer module
Photovoltaic array, the solid-state transformer is divided into three-phase, and output mould is exchanged per passing through after mutually being connected using multiple submodule high-pressure side H bridges
Block accesses power network, and the AC output module is composed in series by filter inductance and A.C. contactor.
Fig. 1 is the system topological figure of solid-state transformer, is mainly included in system：Photovoltaic array, DC/DC modules, direct current break
The common three-phase of road device QZ1, system, all includes soft charging resistor, AC circuit breaker QF1, soft contactor KM1, inductance L per phase,
Per mutually N number of module.System master controller is communicated with module by optical fiber.Wherein photovoltaic array and DC/DC modules is one-to-one
Be used in series, common n groups, solid-state transformer module low-pressure side be parallel to by QZ1, after the series connection of module high voltage side with it is soft open resistance and
KM1 connections, wherein soft charging resistor is used with KM1 for parallel way, high-voltage fence is accessed by QF1；
Fig. 2 is the topological diagram of solid-state transformer module, and by the structure composition that double active bridge+H bridges are direct-connected, double active bridges are by two
Individual H bridges are connected to form by high frequency transformer and resonant inductance, high-pressure side and the electric capacity C of double active bridgesHIn parallel, low-pressure side and electricity
Hold CLParallel connection, module uses low pressure lateral capacitance C in every phase of systemLParallel connection, the mode of high-pressure side output series connection；
Fig. 3 is double active 4 switching tube action timing diagrams of bridge low-pressure side, and Ton is that pipe opens level, and Toff closes for pipe
Power-off is flat.Tc is the pipe action cycle, and t1 is the small pulse width of final output, and wherein t1+t2=Tc, t3 is that 1 pipe is turned off to 3
Pipe opens interlude and 2 pipes open to the time that 4 pipes hold off interval.
Fig. 4 is double active bridge small-pulse effect charging output waveforms, is made up of periodic positive pulse and periodic negative pulse,
Wherein t1 is the level width of small-pulse effect, and it is also negative pulse interval time adjacent positive pulse interval time simultaneously that t2, which is, and t3 is just
Negative pulse interval time, Tc is positive pulse cycle and negative pulse cycle；
Implementing process by Fig. 3 to Fig. 4 is：
1st, 4 pipes are turned on, the shut-off of 2,3 pipes, and low-pressure side output voltage VoutL is the double active bridge L of positive level+U.1 pipe passes through t1
Turned off after time, 2 pipes open that 3,4 pipe hold modes are constant by the t1 times excessively, the positive level+U of now VoutL outputs t1 width
It is changed into 0 level after double active bridge L.
Last state continued after the t3 times, the conducting of 3 pipes, the shut-off of 4 pipes, and now 2,3 pipes are simultaneously in opening state, 1,4
Pipe is off state simultaneously, and VoutL is output as the double active bridge L of negative level-U.3 pipes are turned off after the t1 times, and 4 pipes pass through t1
Turned on after time, now VoutL is changed into 0 level after exporting the double active bridge L of negative level-U of t1 width.
Repeat A) and B) process VoutL ends will continue export Fig. 4 small-pulse effect waveform, that is, realize and filled on high-tension side
Electric process.Wherein t1+t2=Tc, t1<t2,t3>0.
Fig. 5 is the complete Booting sequence figure of solid-state transformer.
Specific steps are illustrated below：
The first step：Low pressure lateral capacitance Cs of the first closed low side dc circuit breaker QZ1 to each submodule of solid-state transformerL
Charged；
Second step：Closed high top-cross stream circuit breaker Q F1 is high to each submodule by high-tension side soft charging resistor
Press lateral capacitance CHPrecharge, closes soft by-pass switch KM1 after charging complete；
3rd step：Submodule of the solid-state transformer per phase is set up with master controller to be communicated；
4th step：When solid-state transformer low-pressure side voltage reaches startup magnitude of voltage, double active bridge low-pressure sides start small-pulse effect
Give high pressure lateral capacitance CHCharging；
5th step：As high pressure lateral capacitance CHVoltage is charged to after setting value, and double active bridges are entered just by small-pulse effect charge mode
Often hair wave mode, controls high pressure lateral capacitance CHVoltage reaches desired value；
6th step：As high pressure lateral capacitance CHVoltage reaches desired value, and high-pressure side H bridges start to be incorporated into the power networks, now started
Journey terminates.
So far, the startup method of solid-state transformer proposed by the present invention is fully completed.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to assert
The embodiment of the present invention is only limitted to this, for general technical staff of the technical field of the invention, is not taking off
On the premise of from present inventive concept, some simple deduction or replace can also be made, the present invention should be all considered as belonging to by institute
Claims of submission determine scope of patent protection.
Claims (2)
1. a kind of method that solid-state transformer starts, it is characterised in that：Solid-state transformer includes 3 phases, per mutually including N number of submodule
Block, submodule is by the direct-connected structure composition of double active bridge and H bridges, and each submodule low-pressure side is in parallel, high-pressure side series connection, each submodule
With system master controller by optical fiber connecting communication, per mutually including soft charging resistor, AC circuit breaker QF1, soft contactor
KM1 and inductance L；
Photovoltaic array is parallel to solid-state transformer low-pressure side, solid-state with the one-to-one dc circuit breaker QZ1 that is connected in series through of DC/DC modules
Be connected after high voltage side of transformer series inductance L with parallel soft charging resistor and soft contactor KM1, soft charging resistor and
High-voltage fence is accessed by AC circuit breaker QF1 after soft contactor KM1 is in parallel；
The method that solid-state transformer starts is comprised the following steps that：
The first step：Low pressure lateral capacitance Cs of the first closed low side dc circuit breaker QZ1 to each submodule of solid-state transformerLFilled
Electricity；
Second step：Closed high top-cross stream circuit breaker Q F1, by high-tension side soft charging resistor to each submodule high-pressure side
Electric capacity CHPrecharge, closes soft contactor KM1 after charging complete；
3rd step：Solid-state transformer is set up with master controller per phase submodule and communicated；
4th step：When solid-state transformer low-pressure side voltage reaches startup magnitude of voltage, double active bridge low-pressure sides start small-pulse effect to height
Press lateral capacitance CHCharging；
5th step：As high pressure lateral capacitance CHVoltage is charged to after setting value, and double active bridges enter normal hair ripple by small-pulse effect charge mode
Pattern, control high pressure lateral capacitance CHVoltage reaches desired value；
6th step：As high pressure lateral capacitance CHVoltage reaches desired value, and high-pressure side H bridges start to be incorporated into the power networks, now start-up course knot
Beam.
2. the method that solid-state transformer according to claim 1 starts, it is characterised in that：Solid-state transformer is inputted by direct current
Module, cascade connection type solid-state transformer module and AC output module composition；The DC side of the cascade connection type solid-state transformer module
Parallel multiplex photovoltaic array, solid-state transformer is divided into three-phase, is exchanged per passing through after mutually being connected using multiple submodule high-pressure side H bridges
Output module accesses power network, and AC output module is composed in series by filter inductance and A.C. contactor；Cascade connection type solid-state transformer
Submodule passes through high frequency transformer and resonant inductance by the direct-connected structure composition of double active bridge and H bridges, double active bridges by two H bridges
It is connected to form, the high and low pressure side of double active bridges is connected in parallel with a capacitor respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710458411.9A CN107124115A (en) | 2017-06-16 | 2017-06-16 | A kind of method that solid-state transformer starts |
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| CN201710458411.9A CN107124115A (en) | 2017-06-16 | 2017-06-16 | A kind of method that solid-state transformer starts |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109103921A (en) * | 2018-07-09 | 2018-12-28 | 许继集团有限公司 | A kind of boosting of photovoltaic DC collects system and its starting control method |
| CN109660117A (en) * | 2018-12-26 | 2019-04-19 | 国网江苏省电力有限公司电力科学研究院 | A kind of electric power electric transformer starting control method |
| CN110138240A (en) * | 2019-05-21 | 2019-08-16 | 中国科学院电工研究所 | Electric power electric transformer high-pressure side dc-link capacitance pre-charge method |
| CN110336325A (en) * | 2019-07-18 | 2019-10-15 | 福建师范大学福清分校 | A kind of control method and device based on the grid-connected topology of New single-phase |
| CN110456198A (en) * | 2019-08-14 | 2019-11-15 | 国网湖南省电力有限公司 | Soft powering method under chain type SVG two and a string of test patterns |
| CN110556815A (en) * | 2019-08-23 | 2019-12-10 | 广东电网有限责任公司珠海供电局 | Quick starting method for direct-current power distribution system |
| CN111146951A (en) * | 2020-01-20 | 2020-05-12 | 特变电工西安电气科技有限公司 | Power electronic transformer capable of being started in two directions and control strategy thereof |
| CN111181374A (en) * | 2020-02-19 | 2020-05-19 | 南京工程学院 | Starting control method of MMC type multi-port solid-state transformer |
| CN113794378A (en) * | 2018-09-26 | 2021-12-14 | 台达电子工业股份有限公司 | Conversion device |
| CN116979589A (en) * | 2023-09-20 | 2023-10-31 | 广东电网有限责任公司珠海供电局 | Starting method and related device for CHB (common bus) branch of flexible interconnection device |
| CN117805690A (en) * | 2024-02-28 | 2024-04-02 | 西安为光能源科技有限公司 | Method for detecting polarity reversal of double-active-bridge topological isolation transformer |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103916019A (en) * | 2014-04-22 | 2014-07-09 | 扬州大学 | Direct-current bus voltage buildup device based on double-active-bridge convertor and starting method thereof |
| CN105846458A (en) * | 2016-04-11 | 2016-08-10 | 特变电工新疆新能源股份有限公司 | Electronic power transformer array based high voltage photovoltaic grid-connected power generation system |
-
2017
- 2017-06-16 CN CN201710458411.9A patent/CN107124115A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103916019A (en) * | 2014-04-22 | 2014-07-09 | 扬州大学 | Direct-current bus voltage buildup device based on double-active-bridge convertor and starting method thereof |
| CN105846458A (en) * | 2016-04-11 | 2016-08-10 | 特变电工新疆新能源股份有限公司 | Electronic power transformer array based high voltage photovoltaic grid-connected power generation system |
Non-Patent Citations (2)
| Title |
|---|
| 吴思文等: "单-双极运行方式转换直流电力电子变压器的启动策略研究", 《电工电能新技术》 * |
| 朱忠虎等: "基于双有源桥体二极管的母线建压启动方法", 《电力电子技术》 * |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109103921A (en) * | 2018-07-09 | 2018-12-28 | 许继集团有限公司 | A kind of boosting of photovoltaic DC collects system and its starting control method |
| CN113794378B (en) * | 2018-09-26 | 2023-11-24 | 台达电子工业股份有限公司 | conversion device |
| CN113794378A (en) * | 2018-09-26 | 2021-12-14 | 台达电子工业股份有限公司 | Conversion device |
| CN109660117B (en) * | 2018-12-26 | 2021-06-08 | 国网江苏省电力有限公司电力科学研究院 | Power electronic transformer starting control method |
| CN109660117A (en) * | 2018-12-26 | 2019-04-19 | 国网江苏省电力有限公司电力科学研究院 | A kind of electric power electric transformer starting control method |
| CN110138240A (en) * | 2019-05-21 | 2019-08-16 | 中国科学院电工研究所 | Electric power electric transformer high-pressure side dc-link capacitance pre-charge method |
| CN110336325B (en) * | 2019-07-18 | 2022-12-02 | 福建师范大学福清分校 | Control method and device based on novel single-phase photovoltaic grid-connected topology |
| CN110336325A (en) * | 2019-07-18 | 2019-10-15 | 福建师范大学福清分校 | A kind of control method and device based on the grid-connected topology of New single-phase |
| CN110456198B (en) * | 2019-08-14 | 2021-09-28 | 国网湖南省电力有限公司 | Soft power-on method in chain type SVG two-in-one-string test mode |
| CN110456198A (en) * | 2019-08-14 | 2019-11-15 | 国网湖南省电力有限公司 | Soft powering method under chain type SVG two and a string of test patterns |
| CN110556815A (en) * | 2019-08-23 | 2019-12-10 | 广东电网有限责任公司珠海供电局 | Quick starting method for direct-current power distribution system |
| CN111146951B (en) * | 2020-01-20 | 2021-08-17 | 特变电工西安电气科技有限公司 | Power electronic transformer capable of being started in two directions and control method thereof |
| CN111146951A (en) * | 2020-01-20 | 2020-05-12 | 特变电工西安电气科技有限公司 | Power electronic transformer capable of being started in two directions and control strategy thereof |
| CN111181374B (en) * | 2020-02-19 | 2021-06-11 | 南京工程学院 | Starting control method of MMC type multi-port solid-state transformer |
| CN111181374A (en) * | 2020-02-19 | 2020-05-19 | 南京工程学院 | Starting control method of MMC type multi-port solid-state transformer |
| CN116979589A (en) * | 2023-09-20 | 2023-10-31 | 广东电网有限责任公司珠海供电局 | Starting method and related device for CHB (common bus) branch of flexible interconnection device |
| CN116979589B (en) * | 2023-09-20 | 2024-01-26 | 广东电网有限责任公司珠海供电局 | Starting method and related device for CHB (common bus) branch of flexible interconnection device |
| CN117805690A (en) * | 2024-02-28 | 2024-04-02 | 西安为光能源科技有限公司 | Method for detecting polarity reversal of double-active-bridge topological isolation transformer |
| CN117805690B (en) * | 2024-02-28 | 2024-05-03 | 西安为光能源科技有限公司 | Method for detecting polarity reversal of double-active-bridge topological isolation transformer |
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