CN102624030A - Photovoltaic/storage battery mixed type current inverter-based distributed generation system - Google Patents
Photovoltaic/storage battery mixed type current inverter-based distributed generation system Download PDFInfo
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Abstract
The invention discloses a photovoltaic/storage battery mixed current inverted-based distributed generation system. The system comprises a first voltage/current transducer, or a second voltage/current transducer or a third voltage/current transducer, as well as a storage battery, a two-way power boosting DC/DC converter connected with the storage battery, a photovoltaic panel, a one-way power boosting DC/DC converter connected with the output terminal of the photovoltaic panel, and a current-mode grid-connected inverter, wherein the two-way power boosting DC/DC converter and the one-way power boosting DC/DC converter are connected with the current-mode grid-connected inverter through the first voltage/current transducer or respectively through the second and the third voltage/current transducers. The current-mode grid-connected inverter-based distributed generation system the has the advantages of the current-mode grid-connected inverter, a photovoltaic system and a storage battery system share one current-mode grid-connected inverter, so the cost is saved.
Description
Technical field
The present invention relates to a kind of electricity generation system, be specifically related to the hybrid electric current inverse type of a kind of photovoltaic/storage battery distribution electricity generation system, belong to electrician, power electronics, generation of electricity by new energy technical field.
Background technology
Present high-power combining inverter mainly contains voltage-source type and current source type two big classes.Since the control of constant, the alternating voltage of DC bus-bar voltage directly, and the voltage source type converter switching device be widely used, the generating research that distributes of present most of inverse type all is based on voltage source inverter.The generating of comparison with voltage inverse type, current inversion type distribute to generate electricity and have the characteristics of self: (1) topological structure is simple.(2) the inverter output voltage waveform is good, and dv/dt is little.(3) inverter PWM strategy is simple.(4) the short circuit current protective capability is strong.During the electrical network failed because, the inverter direct-flow side inductance has metering function preferably.(5) because output waveform is approaching sinusoidal wave, the cable length that is incorporated into the power networks of inverter allows longer.(6) current source inverter self has boost function.Can regenerative resource (like photovoltaic cell) output directly be inserted electrical network through inverter, need not the DC/DC booster converter.(7) inductive effect of part dc bus inductance cable capable of using realizes, the dc bus inductance has the long life-span.(8) current inversion type distribution generating dynamic property can satisfy regenerative resource variable power requirements such as wind-force, photovoltaic fully.
Domestic and international most grid-connected photovoltaic systems all are based on voltage source inverter at present, and current inversion type grid-connected system seldom; And the accumulator charging/discharging system based on current source inverter is also considerably less.
Because the power output of renewable energy systems such as photovoltaic has intermittent characteristics, therefore give the transmission of electricity destabilizing factor that electrical network brings, limited being incorporated into the power networks on a large scale based on renewable energy source distribution generating.So need energy-storage system such as battery system to participate in the level and smooth of power output in the reality, compensate the unstable power output of regenerative resource.On the other hand, when main electrical network overhauls or breaks down, break and local load forms the isolated island electrical network together from main electrical network based on the distribution generating meeting of regenerative resource, the generating that at this moment distributes needs to give the locality load in the isolated island electrical network that the energy is provided.And it is unstable based on the distribution generating of regenerative resource owing to its power output; Can not balance with local power load in the isolated island electrical network, therefore must cooperate and fill up the power difference between the local power load in distribution electricity generation system power output and the isolated island electrical network by energy-storage system.
Traditional photovoltaic and battery system link in grid side through combining inverter separately, need at least two cover combining inverters like this, thereby have increased the cost of system.
Summary of the invention
Deficiency to the prior art existence; The object of the invention provides a kind of hybrid electric current inverse type of photovoltaic/storage battery distribution electricity generation system that reduces cost and have current mode combining inverter advantage; The not only smoothly transient output of photovoltaic battery panel output, and under the isolated island electrical network, have the ability that supports line voltage.
To achieve these goals, the present invention realizes through following technical scheme:
The present invention includes second voltage/current converter and the tertiary voltage/power pack of the first voltage/current converter or series connection, all be used for voltage transitions is become electric current; Storage battery; Bidirectional power voltage boosting dc/DC converter is connected with storage battery, is used for storage battery is discharged and recharged; Photovoltaic battery panel; Unidirectional power voltage boosting dc/DC converter is connected with the photovoltaic battery panel output, is used for sending the energy that photovoltaic battery panel sends to first voltage/current converter or tertiary voltage/power pack; With the current mode combining inverter, be connected with the electrical network input, be used for converting the direct current of the first voltage/current converter or the second voltage/current converter and tertiary voltage/power pack output to alternating current; Bidirectional power voltage boosting dc/DC converter all is connected with current mode combining inverter input through the first voltage/current converter with unidirectional power voltage boosting dc/DC converter output, or bidirectional power voltage boosting dc/DC converter is connected with current mode combining inverter input with tertiary voltage/power pack through the second voltage/current converter respectively with unidirectional power voltage boosting dc/DC converter output.
Two outputs of above-mentioned storage battery, photovoltaic battery panel, bidirectional power voltage boosting dc/DC converter and unidirectional power voltage boosting dc/DC converter all are parallel with electric capacity, are used to reduce voltage ripple.
Above-mentioned current mode combining inverter is connected with electrical network through inductance, is used to reduce the grid-connected current harmonic wave, realizes grid-connected current control.
The said system structure has generality, integrated applicable to other regenerative resource and energy-storage system.Wherein, photovoltaic battery panel can be replaced by fuel cell, and storage battery can be replaced by super capacitor.
Therefore photovoltaic/battery system proposed by the invention has advantages such as current inversion type distributed power generation topological structure is simple, the fault-current protection ability is strong, have boost function, the DC side energy storage device inductance life-span is long based on the current mode combining inverter; The shared current mode combining inverter of photovoltaic system of the present invention and battery system has been practiced thrift cost, and control directly, simply; The present invention with storage battery and photovoltaic system in the DC side effective integration, the not only smoothly transient output of photovoltaic battery panel output, and system is had under the isolated island electrical network, have the ability that supports line voltage; When the electrical network failed because, energy can effectively store in the storage battery in the photovoltaic, has avoided the grid-connected current overcurrent.
Description of drawings
Fig. 1 is photovoltaic/hybrid electric current inverse type distribution power generation system structure sketch map of storage battery parallel connection proposed by the invention;
Fig. 2 is photovoltaic/storage battery series hybrid formula current inversion type distribution power generation system structure sketch map proposed by the invention;
Fig. 3 is the specific embodiments sketch map of the hybrid electric current inverse type of photovoltaic/storage battery distribution electricity generation system proposed by the invention.
Each label among the figure: storage battery 1, bidirectional power voltage boosting dc/DC converter 2, photovoltaic battery panel 3, unidirectional power voltage boosting dc/DC converter 4; The first voltage/current converter 5-1, the second voltage/current converter 5-2, tertiary voltage/power pack 5-3, current mode combining inverter 6; Electrical network 7, current inversion type photovoltaic generating system 8, nonlinear load 9, the photovoltaic/hybrid electric current inverse type distribution electricity generation system 10 of storage battery parallel connection; Current inversion type wind generator system 11, photovoltaic/storage battery series hybrid formula current inversion type distribution electricity generation system 12, the first linear loads 13; First circuit breaker, 14, the second circuit breakers, 15, the second linear loads 16.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect and be easy to understand and understand, below in conjunction with embodiment, further set forth the present invention.
The present invention proposes two kinds of concrete structures: first kind is that photovoltaic/hybrid electric current inverse type distribution electricity generation system of storage battery parallel connection is photovoltaic/storage battery series hybrid formula current inversion type distribution electricity generation system 12 for 10, the second kinds.
Wherein, photovoltaic/hybrid electric current inverse type distribution electricity generation system 10 of storage battery parallel connection comprises the first voltage/current converter 5-1, storage battery 1, the bidirectional power voltage boosting dc/DC converter 2 that is connected with storage battery 1, photovoltaic battery panel 3, unidirectional power voltage boosting dc/DC converter 4 that is connected with photovoltaic battery panel 3 outputs and the current mode combining inverter 6 that is connected with electrical network 7 inputs; Bidirectional power voltage boosting dc/DC converter 2 all is connected with current mode combining inverter 6 inputs through the first voltage/current converter 5-1 with unidirectional power voltage boosting dc/DC converter 4 outputs.
In this system; Photovoltaic system is parallelly connected at the direct current voltage bus place through bidirectional power voltage boosting dc/DC converter 2 through unidirectional power voltage boosting dc/DC converter 4, battery system; This direct current voltage bus links through the public first voltage/current converter 5-1 and a direct current bus, and this direct current bus inserts electrical network 7 through current mode combining inverter 6 again.
Referring to Fig. 1, storage battery 1 links through the bidirectional power voltage boosting dc/DC converter 2 and the first voltage/current converter 5-1, and bidirectional power voltage boosting dc/DC converter 2 is used for storage battery 1 is discharged and recharged.Photovoltaic battery panel 3 links through the unidirectional power voltage boosting dc/DC converter 4 and the first voltage/current converter 5-1, is used for sending the energy that photovoltaic battery panel 3 sends to first voltage/current converter 5-1.Unidirectional power voltage boosting dc/DC converter 4 is parallelly connected at outlet side with bidirectional power voltage boosting dc/DC converter 2.The first voltage/current converter 5-1 changes into electric current with the output voltage of bidirectional power voltage boosting dc/DC converter 2 and unidirectional power voltage boosting dc/DC converter 4, and links with current mode combining inverter 6.Direct current is changed into the interchange grid-connected current to current mode combining inverter 6 and electrical network 7 links.
Wherein, photovoltaic/storage battery series hybrid formula current inversion type distribution electricity generation system 12 comprises the second voltage/current converter 5-2 and tertiary voltage/power pack 5-3, storage battery 1, the bidirectional power voltage boosting dc/DC converter 2 that is connected with storage battery 1, photovoltaic battery panel 3, unidirectional power voltage boosting dc/DC converter 4 that is connected with photovoltaic battery panel 3 outputs and the current mode combining inverter 6 that is connected with electrical network 7 inputs of series connection; Bidirectional power voltage boosting dc/DC converter 2 is connected with current mode combining inverter 6 inputs with tertiary voltage/power pack 5-3 through the second voltage/current converter 5-2 respectively with unidirectional power voltage boosting dc/DC converter 4 outputs.
In this system, photovoltaic system and battery system are respectively through independently voltage/current converter (the second voltage/current converter 5-2, tertiary voltage/power pack 5-3) and public current mode combining inverter 6 direct current buses link.Like this, the voltage/current converter of photovoltaic system and battery system will form series connection at direct current bus place.
Referring to Fig. 2, storage battery 1 links through the bidirectional power voltage boosting dc/DC converter 2 and the second voltage/current converter 5-2, and bidirectional power voltage boosting dc/DC converter 2 is used for storage battery 1 is discharged and recharged.Photovoltaic battery panel 3 links through unidirectional power voltage boosting dc/DC converter 4 and tertiary voltage/power pack 5-3, and the energy that photovoltaic battery panel 3 is sent sends tertiary voltage/power pack 5-3 to.The second voltage/current converter 5-2 changes into electric current with the output voltage of bidirectional power voltage boosting dc/DC converter 2, and tertiary voltage/power pack 5-3 changes into electric current with the output voltage of unidirectional power voltage boosting dc/DC converter 4.The output of the output of the second voltage/current converter 5-2 and tertiary voltage/power pack 5-3 series connection, and link with the dc bus of current mode combining inverter 6.Direct current is changed into the interchange grid-connected current to current mode combining inverter 6 and electrical network 7 links.
In the photovoltaic/storage battery hybrid electric current inverse type distribution electricity generation system 10 of parallel connection and the photovoltaic/storage battery series hybrid formula current inversion type distribution electricity generation system 12, all be parallel with electric capacity at two outputs of storage battery 1, photovoltaic battery panel 3, bidirectional power voltage boosting dc/DC converter 2 and unidirectional power voltage boosting dc/DC converter 4; Current mode combining inverter 6 is connected with electrical network 7 through inductance; Photovoltaic battery panel 3 can be replaced by fuel cell, and storage battery 1 can be replaced by super capacitor.And two kinds of systems all form widenable to a plurality of photovoltaic passage and a plurality of accumulator channels that are made up of storage battery 1 and bidirectional power voltage boosting dc/DC converter 2 that are made up of photovoltaic battery panel 3 and unidirectional power voltage boosting dc/DC converter 4.
Bidirectional power voltage boosting dc/DC converter 2 of mentioning among the present invention; Unidirectional power voltage boosting dc/DC converter 4; The first voltage/current converter 5-1; The second voltage/current converter 5-2, tertiary voltage/power pack 5-3 and current mode combining inverter 6 are existing device, repeat no more here.
Referring to Fig. 3; The hybrid electric current inverse type distribution electricity generation system of current inversion type photovoltaic generating system 8, photovoltaic/storage battery parallel connection 10, current inversion type wind generator system 11, photovoltaic/storage battery series hybrid formula current inversion type distribution electricity generation system 12 be in the parallel connection of electrical network 7 sides, and also connected nonlinear load 9, first linear load 13 and second linear load 16 in the electrical network 7.
When first circuit breaker 14 and second circuit breaker, 15 equal closures, all systems all are incorporated into the power networks among Fig. 3.The AC side output of the hybrid electric current inverse type distribution electricity generation system of current inversion type photovoltaic generating system 8, photovoltaic/storage battery parallel connection 10, current inversion type wind generator system 11, photovoltaic/storage battery series hybrid formula current inversion type distribution electricity generation system 12 is meritorious, and reactive power is by combining inverter control separately.
When first circuit breaker 14 was broken off, the hybrid electric current inverse type distribution electricity generation system of current inversion type photovoltaic generating system 8 among Fig. 3, nonlinear load 9, photovoltaic/storage battery parallel connection 10, current inversion type wind generator system 11, photovoltaic/storage battery series hybrid formula current inversion type distribution electricity generation system 12, second linear load 16 formed the isolated island electrical networks.At this moment, photovoltaic/storage battery hybrid electric current inverse type distribution electricity generation system 10 of parallel connection and photovoltaic/storage battery series hybrid formula current inversion type distribution electricity generation system 12 will realize respective output voltages control, coordinate control.Because these the two kinds of hybrid electric current inverse type of photovoltaic/storage battery distribution power generation system structures both can inject electric energy in electrical network; Also can from electrical network, absorb electric energy; Therefore can compensate the difference between generating and power load in the isolated island electrical network, can be used for supporting the voltage of isolated island electrical network.
More than show and described basic principle of the present invention and principal character and advantage of the present invention.The technical staff of the industry should understand; The present invention is not restricted to the described embodiments; That describes in the foregoing description and the specification just explains principle of the present invention; Under the prerequisite that does not break away from spirit and scope of the invention, the present invention also has various changes and modifications, and these variations and improvement all fall in the scope of the invention that requires protection.The present invention requires protection range to be defined by appending claims and equivalent thereof.
Claims (4)
1. the hybrid electric current inverse type of a photovoltaic/storage battery distribution electricity generation system is characterized in that, comprises
The second voltage/current converter (5-2) of the first voltage/current converter (5-1) or series connection and tertiary voltage/power pack (5-3) all are used for voltage transitions is become electric current;
Storage battery (1);
Bidirectional power voltage boosting dc/DC converter (2) is connected with storage battery (1), is used for storage battery (1) is discharged and recharged;
Photovoltaic battery panel (3);
Unidirectional power voltage boosting dc/DC converter (4) is connected with photovoltaic battery panel (3) output, is used for sending the energy that photovoltaic battery panel (3) sends to the first voltage/current converter (5-1) or tertiary voltage/power pack (5-3);
With current mode combining inverter (6), be connected with electrical network (7) input, be used for converting the direct current of the first voltage/current converter (5-1) or the second voltage/current converter (5-2) and tertiary voltage/power pack (5-3) output to alternating current;
Said bidirectional power voltage boosting dc/DC converter (2) all is connected with current mode combining inverter (6) input through the first voltage/current converter (5-1) with unidirectional power voltage boosting dc/DC converter (4) output, or said bidirectional power voltage boosting dc/DC converter (2) is connected with current mode combining inverter (6) input with tertiary voltage/power pack (5-3) through the second voltage/current converter (5-2) respectively with unidirectional power voltage boosting dc/DC converter (4) output.
2. the hybrid electric current inverse type of photovoltaic/storage battery according to claim 1 distribution electricity generation system is characterized in that,
Two outputs of said storage battery (1), photovoltaic battery panel (3), bidirectional power voltage boosting dc/DC converter (2) and unidirectional power voltage boosting dc/DC converter (4) all are parallel with electric capacity.
3. the hybrid electric current inverse type of photovoltaic/storage battery according to claim 1 distribution electricity generation system is characterized in that,
Said current mode combining inverter (6) is connected with electrical network (7) through inductance.
4. according to any hybrid electric current inverse type of the described photovoltaic/storage battery distribution electricity generation system of claim 1 to 3, it is characterized in that,
Said photovoltaic battery panel (3) can be replaced by fuel cell, and said storage battery (1) can be replaced by super capacitor.
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| CN102738885A (en) * | 2012-07-10 | 2012-10-17 | 上海市电力公司 | Storage battery energy storage and photovoltaic power generation hybrid system |
| CN103009989A (en) * | 2012-12-14 | 2013-04-03 | 东南大学 | Mixed current source type energy transmitting and driving equipment |
| CN103475014A (en) * | 2013-08-22 | 2013-12-25 | 国家电网公司 | Electric energy quality controller of wind driven generator based on battery energy storage and control method |
| WO2015192813A1 (en) * | 2014-06-20 | 2015-12-23 | 郑州大学 | Dual-power photovoltaic inverter and control method thereof |
| CN105471238A (en) * | 2015-12-23 | 2016-04-06 | 厦门科华恒盛股份有限公司 | Direct current bus voltage ripple compensating method and photovoltaic inverter |
| CN105811448A (en) * | 2016-05-16 | 2016-07-27 | 山东大学 | Switching theory-based wind electricity DC bus voltage control system and method |
| CN108233420A (en) * | 2018-02-01 | 2018-06-29 | 中车株洲电力机车有限公司 | A kind of photovoltaic solar system and its control method |
| CN110620377A (en) * | 2019-09-16 | 2019-12-27 | 哈尔滨工程大学 | Three-port DC-DC converter applied to efficient energy transmission of photovoltaic power generation system and control method thereof |
| CN110994993A (en) * | 2019-12-30 | 2020-04-10 | 施耐德电气（中国）有限公司 | Multichannel bidirectional buck-boost circuit |
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| CN102738885A (en) * | 2012-07-10 | 2012-10-17 | 上海市电力公司 | Storage battery energy storage and photovoltaic power generation hybrid system |
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| CN108233420A (en) * | 2018-02-01 | 2018-06-29 | 中车株洲电力机车有限公司 | A kind of photovoltaic solar system and its control method |
| CN110620377A (en) * | 2019-09-16 | 2019-12-27 | 哈尔滨工程大学 | Three-port DC-DC converter applied to efficient energy transmission of photovoltaic power generation system and control method thereof |
| CN110620377B (en) * | 2019-09-16 | 2023-06-09 | 哈尔滨工程大学 | Three-port DC-DC converter for energy efficient transmission and control method thereof |
| CN110994993A (en) * | 2019-12-30 | 2020-04-10 | 施耐德电气（中国）有限公司 | Multichannel bidirectional buck-boost circuit |
| CN110994993B (en) * | 2019-12-30 | 2021-01-29 | 施耐德电气（中国）有限公司 | Multichannel bidirectional buck-boost circuit |
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