CN103208820A - Bidirectional electric energy converter for intelligent power grid - Google Patents
Bidirectional electric energy converter for intelligent power grid Download PDFInfo
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- CN103208820A CN103208820A CN2013101412432A CN201310141243A CN103208820A CN 103208820 A CN103208820 A CN 103208820A CN 2013101412432 A CN2013101412432 A CN 2013101412432A CN 201310141243 A CN201310141243 A CN 201310141243A CN 103208820 A CN103208820 A CN 103208820A
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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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Abstract
The invention relates to a bidirectional electric energy converter for an intelligent power grid. The bidirectional electric energy converter comprises an isolation transformer, a bidirectional alternating current/direct current (AC/DC) unit, a bidirectional DC/DC unit, a switch, a group of photovoltaic battery arrays and a group of storage battery packs. The bidirectional electric energy converter can absorb electric energy from the power grid to be used for charging to the storage battery groups and can also feed the electric energy which is emitted by the photovoltaic battery arrays back to the power grid. In addition, when the power failure of the power grid occurs or the power grid is needed to be powered, the electric energy stored in storage batteries can be fed back to the power grid, so that other important loads on the power grid can operate normally. The bidirectional electric energy converter can integrate power generation and power utilization, so that the cost of equipment is reduced.
Description
Technical field
The present invention relates to the two-way electrical energy transformer of a kind of used for intelligent electric network.
Background technology
Intelligent grid is the inexorable trend of electric power network technique development, also is the emerging field of giving priority to of China's electric power system.In recent years, technology such as communication, computer, automation obtain application extensively and profoundly in electrical network, and organically blend with the conventional electric power technology, have greatly promoted the intelligent level of electrical network.Photovoltaic power generation technology in the intelligent grid and distributed access technology are the present hot research directions in this field, also are the important technology that intelligent grid and photovoltaic generation are pushed practicability to is supported.
One big characteristics of intelligent grid are the accesses that can adapt to a large amount of distributed power sources such as photovoltaic generation, wind power generation.It is one-side to the electrical network conveying capacity that but the combination between intelligent grid and the photovoltaic generation at present only is photovoltaic generating system, absorbs energy from electrical network if desired and be used for charging a battery, and then needs to use the extra equipment that is similar to charger.Can not in an equipment, realize the two-way flow of energy, so just increase the cost of whole system, be unfavorable for development and the popularization of intelligent grid technology.
Summary of the invention
The object of the present invention is to provide the two-way electrical energy transformer of a kind of used for intelligent electric network.
The two-way electrical energy transformer of used for intelligent electric network that the present invention proposes, concrete structure is as follows:
1) isolating transformer 1 is used for isolating being electrically connected between two-way electrical energy transformer and the public electric wire net;
2) two-way AC/DC unit 2, when needs during to the electrical network conveying capacity, two-way AC/DC unit 2 works in the DC-AC pattern, and direct current is converted to and line voltage amplitude, frequency and phase place identical alternating current all; When needs absorbed energy from electrical network, two-way AC/DC unit 2 worked in the AC-DC pattern, with grid alternating current, converts direct current to;
3) two-way DC/DC unit 3, when needs during to the electrical network conveying capacity, two-way DC/DC unit 3 works in the BOOST circuit-mode, and with low-voltage DC, boosting is the 700V high voltage direct current; When needs absorbed energy from electrical network, this cell operation converted the 700V high voltage direct current to the 0-48V low-voltage DC in the BUCK circuit-mode, was used for to battery charging;
4) switch 4 is used for being electrically connected between control photovoltaic battery array 5, batteries 6 and the two-way electrical energy transformer;
5) one group of photovoltaic battery array 5 is used for carrying out photovoltaic generation;
6) a group storage battery group 6 is used for storage of electrical energy;
Wherein: the input of isolating transformer 2 connects public electric wire net, the input of two-way AC/DC unit 2 connects the output of isolating transformer 2, the output of two-way AC/DC unit 2 connects the input of two-way DC/DC unit 3, the output of two-way DC/DC unit 3 connects batteries 6 and switch 4 respectively, and switch 4 links to each other with photovoltaic battery array 5; Described switch 4 is for being electrically connected between control photovoltaic battery array, batteries and the two-way electrical energy transformer.
Among the present invention, described two-way AC/DC is made up of three phase full bridge circuit and LC high frequency filter unit 2.
Among the present invention, described two-way DC/DC is made up of single-phase semi-bridge circuit and LC high frequency filter unit 3.
Among the present invention, described two-way DC/DC unit 3 outputs are provided with switch 4, are used for being electrically connected between control photovoltaic battery array 5, batteries 6 and the two-way electrical energy transformer.
Two-way electrical energy transformer of the present invention can be realized the two-way flow of energy.The electric energy input electrical network that photovoltaic battery array can either be sent can absorb electric energy from electrical network again, is used for charge in batteries.Simultaneously when grid cut-off, or electrical network be need support the time, and storage battery can feed back to electrical network with the electric energy of its storage again, guarantees that other important load on the electrical network can operate as normal.The present invention combines closely intelligent grid and photovoltaic generation, realizes generating, with electrical integrated, has reduced equipment cost.
Description of drawings
Fig. 1 is system architecture diagram of the present invention.
Fig. 2 is electrical schematic diagram of the present invention.
Number in the figure: 1 is isolating transformer, and 2 is two-way AC/DC unit, and 3 is two-way DC/DC unit, and 4 is switch, and 5 is photovoltaic battery array, and 6 is batteries.
Embodiment
Below in conjunction with accompanying drawing and example, the present invention is described in further detail.
Embodiment 1: referring to Fig. 1～2, the present invention is made up of isolating transformer 1, two-way AC/DC unit 2, two-way DC/DC unit 3, switch 4, photovoltaic battery array 5 and batteries 6.The conversion that two-way AC/DC unit 2 is realized between alternating current and the direct current, its input connects public electric wire net, and output connects the input of two-way DC/DC unit 3; The conversion that two-way DC/DC unit 3 is realized between the high and low pressure direct current, its output connects batteries 6 and switch 4 respectively; Photovoltaic battery array 5 is by K switch 1(as shown in Figure 2) be connected with two-way DC/DC unit 3.
Two-way AC/DC unit 2 comprises, net side inductance L 1, filter capacitor C1 and the three phase full bridge circuit of being made up of six power devices.Three phase controlled rectifier circuit in conjunction with phase locked algorithm, is exported corresponding PWM ripple according to the SVPWM control algolithm, controls six power devices and turns on and off according to certain rule.When needs absorb energy from electrical network, carry out the unity power factor rectification, convert grid alternating current to direct current; When needs during to the electrical network feedback energy, carry out the unity power factor inversion, direct current is converted to and line voltage amplitude, frequency, phase place identical alternating current all.Power device adopts insulated gate bipolar transistor IGBT and corresponding drive circuit thereof, also can adopt power transistor GTR or Metal-oxide-semicondutor type field effect transistor M OSFET or gate turn off thyristor GTO.
Two-way DC/DC unit 3 comprises, the single-phase semi-bridge circuit of being made up of two power devices and the high-frequency filter circuit of being made up of L2 and C2.When needs during to battery charging, work in the BUCK circuit-mode, convert high voltage direct current to low-voltage DC; When needs feed back electric energy to electrical network, work in the BOOST circuit-mode, convert low-voltage DC to high voltage direct current.
Concrete operation principle of the present invention is:
When needs absorb energy from electrical network, when being used for charging a battery, two-way AC/DC cell operation is in the AC-DC pattern, and the three phase full bridge circuit is realized the unity power factor rectification, converts grid alternating current to the 700V direct current.Two-way DC/DC cell operation is formed the BUCK circuit in the BUCK circuit-mode by T1, D2, L2, C2, and the 700V direct current is depressurized to the 0-48V low-voltage DC, is used for the charging of accumulators group.This moment, K switch 1 was allocated to b, and batteries is connected with two-way electrical energy transformer.
When needs fed back to electrical network with electric energy, K switch 1 was allocated to a, photovoltaic battery array was connected with two-way electrical energy transformer or switch is allocated to b, and batteries is connected with two-way electrical energy transformer.This moment, two-way DC/DC cell operation was in the BOOST circuit-mode, formed the BOOST circuit by C2, L2, T2, D1, and the low-voltage DC that photovoltaic battery array or storage battery are exported converts the 700V high voltage direct current to.Two-way AC/DC cell operation is in the DC-AC pattern, and the three phase full bridge circuit is realized the unity power factor inversion, and the 700V direct current is converted to and line voltage amplitude, frequency, phase place identical alternating current all.
The present invention combines closely intelligent grid and photovoltaic generation, by two-way electrical energy transformer, realizes generating, with electrical integrated, has reduced equipment cost.
Claims (3)
1. two-way electrical energy transformer of used for intelligent electric network is characterized in that being made up of following structure:
1) isolating transformer (1) is used for isolating being electrically connected between two-way electrical energy transformer and the public electric wire net;
2) a two-way AC/DC unit (2), when needs during to the electrical network conveying capacity, two-way AC/DC unit (2) works in the DC-AC pattern, and direct current is converted to and line voltage amplitude, frequency and phase place identical alternating current all; When needs absorbed energy from electrical network, two-way AC/DC unit (2) worked in the AC-DC pattern, with grid alternating current, converts direct current to;
3) a two-way DC/DC unit (3), when needs during to the electrical network conveying capacity, two-way DC/DC unit (3) works in the BOOST circuit-mode, and with low-voltage DC, boosting is the 700V high voltage direct current; When needs absorbed energy from electrical network, this cell operation converted the 700V high voltage direct current to the 0-48V low-voltage DC in the BUCK circuit-mode, was used for to battery charging;
4) switch (4) is used for being electrically connected between control photovoltaic battery array (5), batteries (6) and the two-way electrical energy transformer;
5) one group of photovoltaic battery array (5) is used for carrying out photovoltaic generation;
6) a group storage battery group (6) is used for storage of electrical energy;
Wherein: the input of isolating transformer (2) connects public electric wire net, the input of two-way AC/DC unit (2) connects the output of isolating transformer (2), the output of two-way AC/DC unit (2) connects the input of two-way DC/DC unit (3), the output of two-way DC/DC unit (3) connects batteries (6) and switch (4) respectively, switch (4) links to each other with photovoltaic battery array (5), and described switch (4) is used for being electrically connected between control photovoltaic battery array, batteries and the two-way electrical energy transformer.
2. the two-way electrical energy transformer of used for intelligent electric network according to claim 1 is characterized in that, described two-way AC/DC unit (2) is made up of LC filter and three phase full bridge circuit.
3. the two-way electrical energy transformer of used for intelligent electric network according to claim 1 is characterized in that, described two-way DC/DC unit (3) is made up of single-phase semi-bridge circuit and LC high frequency filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2013101412432A CN103208820A (en) | 2013-04-23 | 2013-04-23 | Bidirectional electric energy converter for intelligent power grid |
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| CN2013101412432A CN103208820A (en) | 2013-04-23 | 2013-04-23 | Bidirectional electric energy converter for intelligent power grid |
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| CN103208820A true CN103208820A (en) | 2013-07-17 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683473A (en) * | 2013-12-11 | 2014-03-26 | 华为技术有限公司 | Three-bridge-arm topology circuit, control method and uninterrupted power supply system |
| CN106549434A (en) * | 2015-09-17 | 2017-03-29 | 传导控股有限责任公司 | Integrated bidirectional battery charger is generated with rechargeable energy |
| CN106961151A (en) * | 2017-03-28 | 2017-07-18 | 易事特集团股份有限公司 | The coordination control strategy of two-stage type DC converter based on efficiency optimization |
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| CN1835332A (en) * | 2006-03-25 | 2006-09-20 | 合肥工业大学 | Photovoltaic converter with functions of disconnecting net, connecting net, charging control and regulating power |
| CN101931238A (en) * | 2010-04-29 | 2010-12-29 | 浙江省电力试验研究院 | Master-slave strategy-based microgrid system coordination control method |
| JP2012196023A (en) * | 2011-03-15 | 2012-10-11 | Omron Corp | Electric power controller and electric power control method |
| CN203219201U (en) * | 2013-04-23 | 2013-09-25 | 上海为恒新能源科技有限公司 | Bidirectional electrical energy converter used for intelligent power grid |
-
2013
- 2013-04-23 CN CN2013101412432A patent/CN103208820A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1835332A (en) * | 2006-03-25 | 2006-09-20 | 合肥工业大学 | Photovoltaic converter with functions of disconnecting net, connecting net, charging control and regulating power |
| CN101931238A (en) * | 2010-04-29 | 2010-12-29 | 浙江省电力试验研究院 | Master-slave strategy-based microgrid system coordination control method |
| JP2012196023A (en) * | 2011-03-15 | 2012-10-11 | Omron Corp | Electric power controller and electric power control method |
| CN203219201U (en) * | 2013-04-23 | 2013-09-25 | 上海为恒新能源科技有限公司 | Bidirectional electrical energy converter used for intelligent power grid |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683473A (en) * | 2013-12-11 | 2014-03-26 | 华为技术有限公司 | Three-bridge-arm topology circuit, control method and uninterrupted power supply system |
| CN103683473B (en) * | 2013-12-11 | 2015-11-25 | 华为技术有限公司 | A kind of three bridge arm topological circuits and control method, uninterruptible power system |
| CN106549434A (en) * | 2015-09-17 | 2017-03-29 | 传导控股有限责任公司 | Integrated bidirectional battery charger is generated with rechargeable energy |
| CN106549434B (en) * | 2015-09-17 | 2021-07-27 | 传导控股有限责任公司 | Bi-directional battery charger integrated with renewable energy generation |
| CN106961151A (en) * | 2017-03-28 | 2017-07-18 | 易事特集团股份有限公司 | The coordination control strategy of two-stage type DC converter based on efficiency optimization |
| CN106961151B (en) * | 2017-03-28 | 2019-05-17 | 易事特集团股份有限公司 | The coordination control strategy of two-stage type DC converter based on efficiency optimization |
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Application publication date: 20130717 |