CN104092243A - Power conditioning system and method based on public bus - Google Patents
Power conditioning system and method based on public bus Download PDFInfo
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- CN104092243A CN104092243A CN201410338750.XA CN201410338750A CN104092243A CN 104092243 A CN104092243 A CN 104092243A CN 201410338750 A CN201410338750 A CN 201410338750A CN 104092243 A CN104092243 A CN 104092243A
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- boost
- buck
- lithium battery
- bridge inverter
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/10—Photovoltaic [PV]
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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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- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The invention relates to a power conditioning system and method based on a public bus, and belongs to the field of power conditioning. The power conditioning system comprises a photovoltaic module, a lithium battery, a Boost circuit, a Buck-Boost conversion circuit, a full-bridge inverter circuit, a mains supply network and a load. The public direct-current bus is formed by the photovoltaic module through the Boost circuit, the lithium battery is hung on the public direct-current bus through the Buck-Boost conversion circuit, the direct-current bus is connected into the mains supply network through the full-bridge inverter circuit, and a grid-connected switch is connected between the full-bridge inverter circuit and the mains supply network in series. The direct-current bus is connected with the load through the full-bridge inverter circuit. The system and method provide isolated island operation for a household power system, and photovoltaic power generation is achieved; grid-connected operation is achieved, a grid side converter carries out inversion; isolated island operation and battery power supply are achieved; grid-connected operation is achieved, four power utilization modes are rectified through the grid side converter, photovoltaic power generation and a mains supply can be freely switched, and the structural manufacturing cost is low.
Description
Technical field
The invention belongs to electric power regulating system, be specifically related to electric power regulating system and method based on common bus.
Background technology
The commonplace family green energy resource system of domestic application is generally photovoltaic generating system, mainly comprises solar energy photovoltaic panel, controller, storage battery, inverter.System configuration is generally that solar energy photovoltaic panel is received storage battery by charge controller, then receives inverter by storage battery, and inverter output end is hung load.
This kind of structural energy utilance is low, and working condition is simple, cannot carry out efficient scheduling to whole system.When sunlight is insufficient, can not and receive in electricity network, limited household electricity, bring very large inconvenience.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of electric power regulating system and method based on common bus, make home energy source network have the solar time to be operated in from net photovoltaic generation state, while there is no photovoltaic energy, be operated in powered battery or and net state, realize and a kind ofly can between different operating modes, freely switch and can ensure Electrical Safety, the electrical system architecture public electric wire net not being polluted.
Technical scheme of the present invention is: a kind of electric power regulating system based on common bus, comprise photovoltaic module, lithium battery, Boost booster circuit, Buck-Boost translation circuit, full bridge inverter, electricity network and load, photovoltaic module forms common DC bus by Boost booster circuit, lithium battery is articulated on common DC bus by Buck-Boost translation circuit, DC bus is incorporated to electricity network by full bridge inverter, is connected in series grid-connected switch between full bridge inverter and electricity network; DC bus connects load by full bridge inverter.Described Buck-Boost translation circuit comprises two switching tube (S
2, S
3) and an inductance (L
2) and electric capacity, inductance (L
2) and capacitances in series after be connected to one of them switching tube (S
3) upper, described lithium battery is connected in parallel on electric capacity.A kind of electric adjustment method based on common bus, it is characterized in that: comprise the steps: step 1: photovoltaic module converts solar energy to electric energy, by Boost booster circuit, Buck-Boost translation circuit by electrical power storage in lithium battery, or by full bridge inverter powering load; Step 2: when the electric energy that photovoltaic module converts is not enough to drive load, lithium battery powers to the load by full bridge inverter; Step 3: when photovoltaic module and electric quantity of lithium battery are not enough to drive load, connect electricity network and power to the load.Photovoltaic side Boost booster circuit is operated in MPPT pattern or CV pattern.The two-way Buck-Boost translation circuit of lithium battery side can be operated in Buck pattern or Boost pattern.The control mode of described Buck-Boost translation circuit is independent PWM control mode.Described full bridge inverter adopts unipolarity modulation or unipolarity modulation.
The present invention has following good effect: this electrical design pattern can make system works exist: islet operation, photovoltaic generation; Be incorporated into the power networks, grid side converter inversion; Islet operation, powered battery; Be incorporated into the power networks, grid side converter rectification.Four kinds of operating mode patterns.In conjunction with suitable energy management strategy, can, according to the reasonable switched system operating mode of output power of photovoltaic module, lithium battery SOC, loading condition and DC bus-bar voltage situation of change, guarantee whole system stable operation.Buck-Boost translation circuit, Boost booster circuit, full bridge inverter form T-shaped structure, and electrical structure is simple, can between several operating modes, switch flexibly according to energy management strategy, and structural cost cost is low.
Accompanying drawing explanation
Fig. 1 is specific embodiment of the invention electric power regulating system structure chart;
Fig. 2 is specific embodiment of the invention Boost voltage booster circuit topological structure figure;
Fig. 3 is the equivalent circuit diagram of specific embodiment of the invention Buck-Boost translation circuit while being operated in Boost pattern;
Fig. 4 is the equivalent circuit diagram of specific embodiment of the invention Buck-Boost translation circuit while being operated in Buck pattern;
Fig. 5 is specific embodiment of the invention full bridge inverter topology diagram;
Fig. 6 (a) is specific embodiment of the invention full bridge inverter unipolarity modulation system;
Fig. 6 (b) is specific embodiment of the invention full bridge inverter bipolarity modulation system;
In figure, 1. electricity network, 2. load, 3. photovoltaic module, 4. lithium battery, 5.Boost booster circuit, 6. full bridge inverter, 7.Buck-Boost translation circuit.
Embodiment
Contrast accompanying drawing below, by the description to embodiment, the specific embodiment of the present invention is as the effect of the mutual alignment between the shape of each related member, structure, each several part and annexation, each several part and operation principle, manufacturing process and operation using method etc., be described in further detail, to help those skilled in the art to have more complete, accurate and deep understanding to inventive concept of the present invention, technical scheme.
Electric power regulating system based on common bus provided by the invention as shown in Figure 1.Whole system is comprised of photovoltaic module 3, lithium battery 4, electricity network 1, load 2 and power inverter, photovoltaic module 3 forms common DC bus by Boost booster circuit 5, lithium battery 4 is articulated on common DC bus by Buck-Boost translation circuit 7, and DC bus is incorporated to electricity network 1 by full bridge inverter 6 or is independently reverse into alternating voltage to load 2 power supplies.As can be seen from the figure, three converters are all connected on common DC bus, thereby form a typical direct current microgrid.By controlling DC bus-bar voltage, can be easy to control the flow of power in direct current microgrid.
Buck-Boost translation circuit 7 comprises two switching tube S
2, S
3with an inductance L
2and electric capacity, inductance L
2with after capacitances in series, be connected to switching tube S
3upper, lithium battery 4 is connected in parallel on electric capacity.
Boost booster circuit 5 principle Analysis: the single-phase DC/DC converter of photovoltaic side has a variety of selections on circuit topology, wherein Boost booster circuit 5 is because following advantage is suitable as the single-phase DC/DC converter of photovoltaic side:
(1) continuous input current;
(2) self diode can stop electric current to flow into photovoltaic module 3;
(3) drive and input altogether, drive circuit simplicity of design.
For photovoltaic side Boost booster circuit 5, photovoltaic module 3 is equivalent to voltage source V pv, and DC bus part below replaces with ohmic load 2R, therefore photovoltaic side Boost booster circuit 5 equivalent circuit diagrams as shown in Figure 2.
Buck-Boost translation circuit 7 principle Analysis: Buck-Boost translation circuit 7 can be operated in Buck pattern and Boost pattern.When it is operated in Buck pattern, control low-pressure side voltage; When it is operated in Boost pattern, control high side voltage.Buck-Boost translation circuit 7 can be divided into following two kinds of control modes in control mode:
(1) independent PWM control mode
(2) complementary PWM control mode
When independent PWM controls, work when upper and lower two switching tubes are different,, when a switching tube job, another one is blocked and is driven, and just utilizes anti-paralleled diode afterflow.With regard to the circuit in Fig. 3, when two-way DC/DC is operated in Boost pattern, S2 drives blockade; When being operated in Buck pattern, S3 drives blockade.Therefore under this control mode, Buck-Boost translation circuit 7 is equivalent to the inverse parallel combination of unidirectional Buck circuit and unidirectional Boost circuit on circuit structure.Its advantage is to control upper fairly simple, only need to control a switching tube.But in the occasion of the frequent switching working mode of needs, moment generation impact may switched.
When complementary PWM controls, upper and lower two switching tubes are complementary work simultaneously.Complementary PWM control mode still can be subdivided into two types in fact.Under complementary PWM control mode, the mode of operation of Buck-Boost translation circuit 7 determines by power flow direction, and along with power flow direction changes and changes.Be power while flowing to high-pressure side from low-pressure side, high side voltage is as controlled device; When power flows to low-pressure side from high-pressure side, controlled device just becomes low-pressure side voltage.In fact this control mode there is no difference in essence with independent PWM control mode under continuous current mode pattern, but can obtain soft Switching Condition under discontinous mode (Discontinuous Current Mode, DCM).
In the present invention, Buck-Boost translation circuit 7 is for controlling battery charging and discharging.Can, by certain restriction threshold values that discharges and recharges is set, guarantee that Buck-Boost translation circuit 7 can not switch continually between charging and discharging state.In sum, Buck-Boost bidirectional DC-DC converter is herein selected independent PWM control mode in control mode.
Fig. 3 has provided equivalent circuit diagram when battery side Buck-Boost translation circuit 7 is operated in Boost pattern.Now to discharge to maintain DC bus-bar voltage constant for lithium battery 4, gives load 2 power supplies.Lithium battery 4 is equivalent to voltage source Ubat.DC bus part below replaces with resistance.The pulse of switching tube S2 is blocked all the time, only independent control switch pipe S3.Buck-Boost translation circuit 7 is now equivalent to unidirectional Boost booster circuit 5.
Suppose that D3 is the conducting duty ratio of switching tube S3, the stable state input/output relation when Buck-Boost translation circuit 7 is operated in Boost pattern is:
Inductive current ripple Δ iL2 (peak-to-peak value) is:
Fig. 4 has provided equivalent circuit diagram when battery side Buck-Boost translation circuit 7 is operated in Buck pattern.Now power flows to lithium battery 4 from DC bus, gives lithium battery 4 chargings.Intermediate dc bus is equivalent to voltage source, with Udc, represents; Lithium battery 4 is equivalent to load 2, with ideal voltage source and resistance series connection, represents, wherein series resistance ro is the internal resistance of lithium battery 4.The pulse of switching tube S3 is blocked all the time, only independent control switch pipe S2.Buck-Boost translation circuit 7 is now equivalent to unidirectional Buck circuit.
In general, lithium battery 4 charging processes can be divided into constant current charge and two stages of constant voltage floating charge.In the constant current charge stage, lithium battery 4 continues charging according to certain charging current, until lithium battery 4 terminal voltages reach rated voltage after charging current sharply decline, thereby be switched to the constant voltage floating charge stage, make up the self discharge of lithium battery 4.
Full-bridge inverting principle Analysis: the equivalent circuit diagram of full bridge inverter 6 as shown in Figure 5.DC bus is connected on a full bridge inverter being comprised of 4 switching tubes 6, and the pulse voltage that inversion produces is through LC filter access load 2.
In single-phase inversion system, sinusoidal pulse width modulation (Sinusoidal Pulse Width Modulation, SPWM) mode with its control algolithm simple and be easy to realize, output harmonic wave is easy to the features such as control and is subject to extensive use.SPWM modulation system comprises unipolarity modulation and bipolarity modulation, and its modulation principle as shown in Figure 6.
When adopting unipolarity modulation, at modulating wave positive half period, S4 often opens, and S6 often closes, the complementary conducting of S5 and S7; At modulating wave negative half-cycle, S5 often opens, and S7 often closes, the complementary conducting of S4 and S6.In a power frequency period, always there are two switching tube low frequency actions, two switching tube high frequency actions.For the sake of simplicity, suppose at the positive half cycle of a certain modulating wave that the duty ratio function that d7 (t) is S7 adopts the inverter switching device side output voltage of unipolarity modulation to be:
V
i＝d
7(t)·V
dc (4)
When adopting bipolarity modulation, no matter at modulating wave positive half period or negative half-cycle, S4 and S7 be action simultaneously all the time, and S5 and S6 be action simultaneously all the time, the complementary conducting of S4 and S6.The duty ratio of supposing S4, S7 is d4 (t), and the duty ratio of S5, S6 is 1-d4 (t) so, adopts the inverter output voltage of bipolarity modulation to be:
V
i＝d
4(t)·V
dc-(1-d
4(t)·V
dc＝(2d
4(t)-1)·V
dc (5)
Two kinds of modulation systems have pluses and minuses separately: unipolarity modulation system is because two switching tubes wherein work in high frequency mode, and other two pipes work in power frequency pattern, so with respect to bipolarity modulation system, its switching loss is lower, the electromagnetic interference producing is less, and the shortcoming of bringing is thus that control mode is more complicated compared with bipolarity modulation, output harmonic wave content greatly, zero crossing voltage distortion, stability be relatively poor etc.
The principle of " generating power for their own use " according to photovoltaic module 3 output energy, determines that the power supply priority order of three micro-power supplys in direct current microgrid is: photovoltaic module 3, lithium battery 4, electrical network.That is: photovoltaic module 3 power outputs preferentially meet self electricity needs of user; The in the situation that of photovoltaic generation quantity not sufficient, first by lithium battery 4, realize power-balance; When photovoltaic module 3 and lithium battery 4 are when all electric weight is all not enough, then as supporting, guarantee power supply by public electric wire net.By controlling grid-connected switch S, can selective system be operated in be incorporated into the power networks operating mode or islet operation operating mode.Adopt public full bridge inverter 6, not only improved inverter utilance, and simplified system configuration, reduced cost.
Different according to the actual conditions of photovoltaic module 3 power outputs, lithium battery 4SOC and load 2, it is constant to control intermediate dc busbar voltage to realize photovoltaic module 3 power outputs maximizations or CV pattern that photovoltaic side Boost booster circuit 5 can be operated in MPPT pattern; It is constant to maintain intermediate dc busbar voltage to realize lithium battery 4 charging controls or Boost pattern that the two-way Buck-Boost translation circuit 7 of lithium battery 4 side can be operated in Buck pattern; Load 2 side full bridge inverters 6 can be operated in grid-connected pattern or independent inverter mode.Which kind of operating mode the present invention should operate according to the actual conditions judgement system of photovoltaic module 3, lithium battery 4 and load 2, controls each converter be operated in correct pattern by cooperation, guarantees that whole system is reasonable, stable operation.
By reference to the accompanying drawings the present invention is exemplarily described above; obviously specific implementation of the present invention is not subject to the restrictions described above; as long as adopted the improvement of the various unsubstantialities that method of the present invention design and technical scheme carry out; or without improving, design of the present invention and technical scheme are directly applied to other occasion, all within protection scope of the present invention.
Claims (7)
1. the electric power regulating system based on common bus, it is characterized in that: comprise photovoltaic module (3), lithium battery (4), Boost booster circuit (5), Buck-Boost translation circuit (7), full bridge inverter (6), electricity network (1) and load (2), photovoltaic module (3) forms common DC bus by Boost booster circuit (5), lithium battery (4) is articulated on common DC bus by Buck-Boost translation circuit (7), DC bus is incorporated to electricity network (1) by full bridge inverter (6), between full bridge inverter (6) and electricity network (1), be connected in series grid-connected switch, DC bus connects load (2) by full bridge inverter (6).
2. the electric power regulating system based on common bus according to claim 1, is characterized in that: described Buck-Boost translation circuit (7) comprises two switching tube (S
2, S
3) and an inductance (L
2) and electric capacity, inductance (L
2) and capacitances in series after be connected to one of them switching tube (S
3) upper, described lithium battery (4) is connected in parallel on electric capacity.
3. according to the electric adjustment method based on common bus described in claim 1-2 any one, it is characterized in that: comprise the steps:
Step 1: photovoltaic module (3) converts solar energy to electric energy, by Buck-Boost translation circuit (7) by electrical power storage in lithium battery (4), or give load (2) power supply by full bridge inverter (6);
Step 2: when the electric energy that photovoltaic module (3) converts is not enough to drive load (2), lithium battery (4) is powered to load (2) by full bridge inverter (6);
Step 3: when photovoltaic module (3) and lithium battery (4) electric weight are not enough to drive load (2), connect electricity network (1) to load (2) power supply.
4. the electric adjustment method based on common bus according to claim 3, is characterized in that: photovoltaic side Boost booster circuit (5) is operated in MPPT pattern or CV pattern.
5. the electric adjustment method based on common bus according to claim 3, is characterized in that: the two-way Buck-Boost translation circuit of lithium battery (4) side can be operated in Buck pattern or Boost pattern.
6. the electric adjustment method based on common bus according to claim 3, is characterized in that: the control mode of described Buck-Boost translation circuit (7) is independent PWM control mode.
7. the electric adjustment method based on common bus according to claim 3, is characterized in that: described full bridge inverter (6) adopts unipolarity modulation or unipolarity modulation.
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| CN201410338750.XA CN104092243A (en) | 2014-07-16 | 2014-07-16 | Power conditioning system and method based on public bus |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104467017A (en) * | 2014-12-24 | 2015-03-25 | 国家电网公司 | Multiport photovoltaic energy storage hybrid power generation system based on high frequency magnetic coupling |
| CN104983144A (en) * | 2015-07-22 | 2015-10-21 | 郑州航空工业管理学院 | Dedusting necklace |
| CN105048854A (en) * | 2015-07-21 | 2015-11-11 | 珠海格力电器股份有限公司 | Three-phase non-isolated grid connection converter and air-conditioning system |
| CN105186919A (en) * | 2015-07-24 | 2015-12-23 | 珠海格力电器股份有限公司 | Non-isolated grid-connected converter, air-conditioning system and converter control method |
| CN105471369A (en) * | 2014-11-17 | 2016-04-06 | 浙江万向太阳能有限公司 | Off-grid PV power generation system and power supply method thereof |
| CN105610231A (en) * | 2014-11-11 | 2016-05-25 | 珠海兴业绿色建筑科技有限公司 | Implementation method of direct-current power system |
| CN105978386A (en) * | 2015-11-26 | 2016-09-28 | 浙江昱能科技有限公司 | Direct current and alternating current power conversion device and photovoltaic power generation system |
| CN106049945A (en) * | 2016-06-30 | 2016-10-26 | 尚诚德 | Stereo garage with intelligent charging function |
| CN110149051A (en) * | 2019-06-25 | 2019-08-20 | 阿特拉斯·科普柯(无锡)压缩机有限公司 | DC-DC converter and its control method |
| CN110768562A (en) * | 2019-11-06 | 2020-02-07 | 南方电网科学研究院有限责任公司 | Topological structure of single-phase inverter, modulation method and device, and storage medium |
| CN115622134A (en) * | 2022-11-29 | 2023-01-17 | 广东高斯宝电气技术有限公司 | MPPT (maximum power point tracking) scheduling control method of photovoltaic power generation system |
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| CN106049945A (en) * | 2016-06-30 | 2016-10-26 | 尚诚德 | Stereo garage with intelligent charging function |
| CN110149051A (en) * | 2019-06-25 | 2019-08-20 | 阿特拉斯·科普柯(无锡)压缩机有限公司 | DC-DC converter and its control method |
| CN110768562A (en) * | 2019-11-06 | 2020-02-07 | 南方电网科学研究院有限责任公司 | Topological structure of single-phase inverter, modulation method and device, and storage medium |
| CN115622134A (en) * | 2022-11-29 | 2023-01-17 | 广东高斯宝电气技术有限公司 | MPPT (maximum power point tracking) scheduling control method of photovoltaic power generation system |
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