CN106505895A - Three level microgrid current transformers - Google Patents
Three level microgrid current transformers Download PDFInfo
- Publication number
- CN106505895A CN106505895A CN201610970607.1A CN201610970607A CN106505895A CN 106505895 A CN106505895 A CN 106505895A CN 201610970607 A CN201610970607 A CN 201610970607A CN 106505895 A CN106505895 A CN 106505895A
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- 239000003990 capacitor Substances 0.000 claims abstract description 22
- 239000003054 catalyst Substances 0.000 claims description 18
- 238000010521 absorption reaction Methods 0.000 claims description 17
- 230000005611 electricity Effects 0.000 claims description 2
- 230000007935 neutral effect Effects 0.000 claims description 2
- 238000001914 filtration Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
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- 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
- H02M7/483—Converters with outputs that each can have more than two voltages levels
-
- H02J3/382—
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/14—District level solutions, i.e. local energy networks
Abstract
The isolating transformer and the simultaneously off-network switching circuit being connected with isolating transformer of the AC filter circuit of a kind of three level microgrid current transformers, the three level bridge circuits connected including DC support circuit and DC support circuit and the connection of three level bridge circuits and the connection of AC filter circuit.Three described level bridge circuits are T-shaped topology, and its DC terminal is connected in parallel with bus Support Capacitor, and which is exchanged end and is connected with AC filter circuit, and output level is more, switching loss is little, the quality of power supply and efficiency of raising system；It is connected with switching switch via isolating transformer again, with four quadrant running function, meets micro-grid system traffic control demand；Isolating transformer is star triangular configuration, possesses the ability with unbalanced load.
Description
Technical field
The present invention relates to a kind of three level microgrid current transformer.
Background technology
Microgrid current transformer can achieve the Two-way energy transfer between AC network electric energy and energy-storage battery electric energy, and which not only may be used
Fast and effeciently to realize the fluctuation for stabilizing the random electric energy of distributed generation system or trend, electrical network is improved to renewable on a large scale
The energy generates electricity, such as the receiving ability of wind energy, photovoltaic, and can receive dispatch command, receives or supplement the peak valley electric energy of electrical network, and
Reactive power is provided, improves power supply quality and the economic benefit of electrical network.
At present, the market application of microgrid current transformer reactor, filter mainly based on two level, in two level current transformer cabinets
Ripple body product is larger, and system effectiveness is low, harmonic content is high, application cost is high.Compared with two level circuits, tri-level circuit has
Series of advantages：Output voltage waveforms are many level, and harmonic wave is little, and required filtering inductance is little, advantageously reduces system cost
And loss；Switching loss is little, efficiency high；Voltage change ratio during switch motion is little, and the EMI for causing is little etc., becomes grinding in the industry
Study carefully focus.
Content of the invention
The purpose of the present invention is the shortcoming for overcoming existing two Level Technology, proposes a kind of based on tri-level circuit topological structure
Microgrid current transformer.The present invention has whole machine change flow module little, high conversion efficiency, low cost and other advantages.
Three level microgrid current transformers of the invention include DC support circuit and the DC support being connected with external dc power
The AC filter circuit and AC filtered electrical of three level bridge circuits of circuit connection and the connection of three level bridge circuits
The isolating transformer of road connection and the simultaneously off-network switching circuit being connected with isolating transformer, and the other end of off-network switching circuit point
It is not connected with external electrical network and load.Described DC support circuit include the preliminary filling electrical circuit being connected in parallel on dc bus and
The bus capacitor for being pre-charged loop-coupled equalizing resistance and being connected with equalizing resistance, the other end of bus capacitor and three level bridges
Formula circuit connects；The suction that three level bridge circuits are included the three-phase bridge arm for being connected in parallel on bus capacitor two ends and are connected with three-phase bridge arm
Electric capacity is received, three-phase phase line is drawn at the midpoint per phase bridge arm；Three-phase phase line is connected with isolating transformer through AC filter circuit,
Switched by switching again and be connected with grid side and load-side respectively.
The present invention also has following technical characteristic：Described DC support circuit busbar electric capacity by two capacitances in series or by
Multiple capacitances in series and compose in parallel, three described level bridge circuits adopt the T-type structure, described AC filter circuit to be
L-type, LC types or LCL type.
The effect of the present invention：
This circuit has four quadrant running function, can realize the two-way flow of energy and simultaneously the switching between off-network pattern is transported
OK.Membrane capacitance does dc bus support, using precharge loop protection bus capacitor；Equalizing resistance is multiplexed one group with discharge resistance
Resistance, reduces space hold while cost-effective；T-shaped three level bridge circuit output level Multi- Switch is lost little, AC
Filter circuit is used for the switch harmonic for filtering PWM generation, the efficiency and the quality of power supply of lift system；It is provided simultaneously with star triangle
The isolating transformer of connection, meets the ability with unbalanced load.
Description of the drawings
Fig. 1 is the electrical structure diagram of the present invention.
Specific embodiment
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
As shown in figure 1, topological structure of the present invention includes the DC support circuit being connected with external dc power and direct current
The AC filter circuit and AC filtering of three level bridge circuits of support circuit connection and the connection of three level bridge circuits
The isolating transformer of circuit connection and the simultaneously off-network switching circuit being connected with isolating transformer, and the other end of off-network switching circuit
It is connected with external electrical network and load respectively.Preliminary filling electrical circuit that described DC support circuit includes being connected in parallel on dc bus,
The bus capacitor being connected with the loop-coupled equalizing resistance of precharge and with equalizing resistance, the other end of bus capacitor and three level
Bridge circuit connects.Three level bridge circuits are included the three-phase bridge arm for being connected in parallel on bus capacitor two ends and are connected with three-phase bridge arm
Absorption Capacitance, the midpoint per phase bridge arm draw U, V, W three-phase phase line；U, V, W three-phase phase line through AC filter circuit with every
It is connected from transformator T1, then is connected with grid side and load-side by switching to switch respectively.
Described preliminary filling electrical circuit is composed in series by second contactor Q2 and first resistor R1, and preliminary filling electrical circuit is connected across
The two ends of one circuit breaker Q 1, the two ends of the first circuit breaker Q 1 are connected with external dc power and equalizing resistance respectively, for protecting
Bus capacitor, it is to avoid the dash current produced during DC voltage impact bus capacitor.
Described bus capacitor is composed in series by the first electric capacity C1 and the second electric capacity C2, and bus capacitor is connected across dc bus
Two ends, the midpoint of the first electric capacity C1 and the second electric capacity C2 of series connection exported as zero level, can adopt two according to capacity requirement
Individual series connection by multiple capacitances in series and is composed in parallel.
Described equalizing resistance is composed in series by second resistance R2 and 3rd resistor R3, and equalizing resistance is connected across bus capacitor
Two ends.Second resistance R2 of series connection is connected with the midpoint of bus capacitor with the midpoint of 3rd resistor R3, for balanced electric capacity string
The distribution of connection voltage, while the voltage during DC side power-off for bus capacitor of releasing.
Described three-phase bridge arm is T-type structure, and by taking U phase bridge arms as an example, bridge arm is by first switch pipe T1, second switch pipe
T2, the 3rd switch transistor T 3 and the 4th switch transistor T 4 are constituted.First switch pipe T1 is connected across direct current after connecting with the 4th switch transistor T 4
The two ends of bus, second switch pipe T2 be connected across after connecting with the 3rd switch transistor T 3 neutral point of bus and first switch pipe T1,
The midpoint of the 4th switch transistor T 4.Wherein first switch pipe T1 and the 4th switch transistor T 4 as main switch, second switch pipe T2 and
3rd switch transistor T 3 constitute two-way switch, realize clamper function so that per mutually obtain+Udc/2,0, three kinds of level of-Udc/2.Its
The structure of remaining V phases bridge arm and W phase bridge arms is identical with U phase bridge arms.
Described Absorption Capacitance is made up of six electric capacity CU3, CU4, CV3, CV4, CW3, CW4, wherein the first Absorption Capacitance
CU3 is connected across the two ends of U phase bridge arms, the 3rd Absorption Capacitance CV3 and the 4th Absorption Capacitance with the second Absorption Capacitance CU4 after connecting
The two ends of V phase bridge arms are connected across after CV4 series connection, and the 5th Absorption Capacitance CW3 is connected across W phases after connecting with the 6th Absorption Capacitance CW4
The two ends of bridge arm, for the peak voltage that absorption circuit stray inductance causes, it is to avoid switching tube is damaged.
Described AC filter circuit is used for the switch harmonic for filtering PWM generation, it is ensured that the output quality of power supply, can
With using topologys such as L, LC or LCL, it is also possible to which directly the former limit leakage inductance by the use of isolating transformer is used as filter circuit.Shown in Fig. 1
For LC types, it is made up of the first reactor L1 and the 5th electric capacity C5, wherein the 5th electric capacity C5 front ends concatenate three resistance R4, R5, R6,
Can effective damping resonance spikes.
Described isolating transformer T1 is coupled for Dyn, plays a part of to suppress harmonic wave and with unbalanced load.
Described and off-network switching circuit is by the 3rd catalyst Q3, the 4th catalyst Q4, the 5, the 6th open circuit of the 5th circuit breaker Q
Device Q6 is constituted；One end connection isolating transformer T1 of wherein the 3rd catalyst Q3, the other end are connected with the 4th catalyst Q4's, the
The other end of four catalyst Q4 is connected with the 5th circuit breaker Q 5, and the other end of the 5th circuit breaker Q 5 is used as electrical network incoming end；6th
One end of circuit breaker Q 6 is connected to the midpoint of connecting of the 3rd catalyst Q3 and the 4th catalyst Q4, and the other end of the 6th circuit breaker Q 6 is made
For loading incoming end.5th circuit breaker Q 5 and the 6th circuit breaker Q 6 as panel switches, the 3rd catalyst Q3 and the 4th catalyst
Q4 realizes the switching of circuit under different working modes as controlling switch.
The course of work of the present invention is as follows：Microgrid current transformer is first started with voltage source mode, and whether detection line voltage is full
Sufficient grid-connected conditions, as met, close grid-connected switching circuit and run on grid-connect mode；Parallel network circuit operation is disconnected if not meeting
In off-network pattern, while the dispatch command according to system realizes discharge and recharge, charging modes are according to current accumulator battery condition selecting
Suitable charging curve operation.
Claims (5)
1. a kind of three level microgrid current transformer, it is characterised in that：Three described level microgrid current transformers include and external dc electricity
The three level bridge circuits and the connection of three level bridge circuits of the DC support circuit of source connection and the connection of DC support circuit
AC filter circuit and AC filter circuit connection isolating transformer and be connected with isolating transformer and off-network cut
Circuit is changed, and the other end of off-network switching circuit is connected with external electrical network and load respectively.
2. three level microgrid current transformer according to claim 1, it is characterised in that：Described DC support circuit is included simultaneously
The preliminary filling electrical circuit being associated on dc bus and the loop-coupled bus capacitor of precharge and the equal piezoelectricity being connected with bus capacitor
Resistance；Described preliminary filling electrical circuit is composed in series by second contactor (Q2) and first resistor (R1), and preliminary filling electrical circuit is connected across
The two ends of one chopper (Q1), the two ends of the first chopper (Q1) are connected with external dc power and equalizing resistance respectively；Described
Bus capacitor be composed in series by the first electric capacity (C1) and the second electric capacity (C2), bus capacitor is connected across the two ends of dc bus,
The midpoint of the first electric capacity C1 and the second electric capacity C2 of series connection is exported as zero level；Described equalizing resistance is by second resistance (R2)
It is composed in series with 3rd resistor (R3), equalizing resistance is connected across the two ends of bus capacitor；The second resistance (R2) of series connection and the 3rd
The midpoint of resistance (R3) is connected with the midpoint of bus capacitor.
3. three level microgrid current transformer according to claim 1, it is characterised in that：Three described level bridge circuits include
The three-phase bridge arm and the Absorption Capacitance being connected with three-phase bridge arm at bus capacitor two ends is connected in parallel on, three-phase is drawn at the midpoint per phase bridge arm
Phase line；Three-phase phase line is connected with isolating transformer through AC filter circuit, then by switching switch respectively with grid side and
Load-side connects；
Described three-phase bridge arm is T-type structure；U phases bridge arm is by first switch pipe (T1), second switch pipe (T2), the 3rd switching tube
(T3) constitute with the 4th switching tube (T4)；First switch pipe (T1) is connected across dc bus after connecting with the 4th switching tube (T4)
Two ends, second switch pipe (T2) be connected across after connecting with the 3rd switching tube (T3) neutral point of bus and first switch pipe (T1),
The midpoint of the 4th switching tube (T4)；First switch pipe (T1) and the 4th switching tube (T4) are used as main switch, second switch pipe
(T2) and the 3rd switching tube (T3) composition two-way switch；The structure of remaining V phases bridge arm and W phase bridge arms is identical with U phases；
Described Absorption Capacitance is made up of six electric capacity (CU3, CU4, CV3, CV4, CW3, CW4)；First Absorption Capacitance (CU3) with
The two ends of U phase bridge arms, the 3rd Absorption Capacitance (CV3) and the 4th Absorption Capacitance is connected across after second Absorption Capacitance (CU4) series connection
(CV4) two ends of V phase bridge arms are connected across after connecting, and the 5th Absorption Capacitance (CW3) is bridged after being connected with the 6th Absorption Capacitance (CW4)
Two ends in W phase bridge arms.
4. three level microgrid current transformer according to claim 1, it is characterised in that：Described and off-network switching circuit is by the
Three catalysts (Q3), the 4th catalyst (Q4), the 5th chopper (Q5), the 6th chopper (Q6) composition；3rd catalyst (Q3)
One end connection isolating transformer (T1), the other end of the 3rd catalyst (Q3) connects with the 4th catalyst (Q4), and the 4th contacts
Device (Q4) other end is connected with the 5th chopper (Q5), and the other end of the 5th chopper (Q5) is used as electrical network incoming end；6th breaks
One end of road device (Q6) is connected to the midpoint of connecting of the 3rd catalyst (Q3) and the 4th catalyst (Q4), the 6th chopper (Q6)
The other end is used as load incoming end；5th chopper (Q5) and the 6th chopper (Q6) as panel switches, the 3rd catalyst
And the 4th catalyst (Q4) is used as controlling switch (Q3).
5. three level microgrid current transformer according to claim 1, it is characterised in that：Described AC filter circuit is L
Type, LC types or LCL type filter circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610970607.1A CN106505895A (en) | 2016-10-28 | 2016-10-28 | Three level microgrid current transformers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610970607.1A CN106505895A (en) | 2016-10-28 | 2016-10-28 | Three level microgrid current transformers |
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| CN106505895A true CN106505895A (en) | 2017-03-15 |
Family
ID=58322830
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| CN201610970607.1A Pending CN106505895A (en) | 2016-10-28 | 2016-10-28 | Three level microgrid current transformers |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108512407A (en) * | 2018-04-25 | 2018-09-07 | 北京天诚同创电气有限公司 | Pre-charge circuit and its control method and current transformer |
| CN111490678A (en) * | 2019-01-29 | 2020-08-04 | 维谛技术有限公司 | Voltage conversion circuit and electronic equipment |
| EP3654480A4 (en) * | 2017-07-10 | 2021-02-17 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | Power conditioner, power system, and reactive power supressing method for power system |
| CN116365890A (en) * | 2023-05-04 | 2023-06-30 | 西南交通大学 | Three-phase staggered T-shaped three-level LLC converter and wide voltage transformation control method thereof |
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| US20110245990A1 (en) * | 2008-10-28 | 2011-10-06 | Technical University Of Denmark | System and method for connecting a converter to a utility grid |
| CN103312210A (en) * | 2013-03-08 | 2013-09-18 | 卧龙电气集团股份有限公司 | Three-phase four-wire type three-level photovoltaic grid-connected inverter |
| CN203457066U (en) * | 2013-08-14 | 2014-02-26 | 北京京仪绿能电力系统工程有限公司 | T-type three-level photovoltaic grid-connected inverter |
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| CN105305553A (en) * | 2015-11-12 | 2016-02-03 | 广东技术师范学院 | Online uninterruptible power supply and power quality management method using same |
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| CN1578077A (en) * | 2003-07-24 | 2005-02-09 | 哈曼国际工业有限公司 | Opposed current converter power factor correcting power supply |
| US20110245990A1 (en) * | 2008-10-28 | 2011-10-06 | Technical University Of Denmark | System and method for connecting a converter to a utility grid |
| CN103312210A (en) * | 2013-03-08 | 2013-09-18 | 卧龙电气集团股份有限公司 | Three-phase four-wire type three-level photovoltaic grid-connected inverter |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3654480A4 (en) * | 2017-07-10 | 2021-02-17 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | Power conditioner, power system, and reactive power supressing method for power system |
| CN108512407A (en) * | 2018-04-25 | 2018-09-07 | 北京天诚同创电气有限公司 | Pre-charge circuit and its control method and current transformer |
| CN111490678A (en) * | 2019-01-29 | 2020-08-04 | 维谛技术有限公司 | Voltage conversion circuit and electronic equipment |
| CN116365890A (en) * | 2023-05-04 | 2023-06-30 | 西南交通大学 | Three-phase staggered T-shaped three-level LLC converter and wide voltage transformation control method thereof |
| CN116365890B (en) * | 2023-05-04 | 2023-11-24 | 西南交通大学 | Three-phase staggered T-shaped three-level LLC converter and wide voltage transformation control method thereof |
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Application publication date: 20170315 |