CN104038049B - The integrated current transformer of non-isolation type three port connection in series-parallel - Google Patents
The integrated current transformer of non-isolation type three port connection in series-parallel Download PDFInfo
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- CN104038049B CN104038049B CN201410134366.8A CN201410134366A CN104038049B CN 104038049 B CN104038049 B CN 104038049B CN 201410134366 A CN201410134366 A CN 201410134366A CN 104038049 B CN104038049 B CN 104038049B
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Abstract
The invention discloses a kind of non-isolation type three integrated converter topology of port connection in series-parallel, belong to power electronics switch technology field, described integrated current transformer includes input dc power potential source Vin1And Vin2, electric capacity of voltage regulation C1And C2, the first switch element, second switch unit, the 3rd switch element, the 4th switch element, output diode DO, inductance L, output capacitance C and load R；At each input side parallel connection storage capacitor, it is simultaneously introduced the 4th switch element and two input sources are connected.When photovoltaic is deactivated, charged for photovoltaic lateral capacitance discontinuously by the switching tube introduced, keep this side stabilized input voltage, and then proof load voltage stabilization；When photovoltaic energy abundance, it is achieved that the DIRECT ENERGY transmission of photovoltaic port and battery port, improve the utilization rate of new forms of energy.The present invention has that volume is little, low cost, integrated level high, realizes power conversion between each port, can flexible compensation, stability of a system high reliability.
Description
Technical field
Technics of Power Electronic Conversion technical field involved in the present invention, a kind of three integrated current transformers of port connection in series-parallel.
Background technology
Along with power demand is gradually increased, the large scale mining of fossil energy and utilization have made world energy sources situation day be becoming tight, and the large quantity of exhaust gas that combustion of fossil fuel produces simultaneously causes serious environmental pollution.Owing to new forms of energy have cleanliness without any pollution, resourceful feature, it is to solve an important channel of contradiction between energy development and environmental protection hence with generation of electricity by new energy.More generation of electricity by new energy form is applied to have wind-power electricity generation, photovoltaic generation, fuel cell power generation, geothermal power generation and tidal power generation etc. at present, but owing to these energy are affected by environment and region limits bigger, its supply of electric power is unstable, discontinuous, so generally being combined by the multiple new forms of energy with complementarity, and it is furnished with energy storage device composition new forms of energy associating electric power system.
In traditional new forms of energy associating electric power system, every kind of energy form typically requires a DC/DC converter, the various energy becomes direct current output, is connected in parallel on public dc bus, supply DC load, but its structure is more complicated, relatively costly.Additionally from the point of view of controlling angle, each converter also to ensure co-ordination between other port while independent control, therefore must be set up the communication network between each port when actual motion, and this can increase the complexity of system.
In order to realize concentrated controling management, new energy system based on multi input converter gets growing concern for and applies.Multi input converter can be divided into isolated form and non-isolation type two class from topology.Isolated form multi input converter many employings high-frequency isolation transformer realizes the electrical isolation of multiple input source and load, realizes the coupling of input source difference electric pressure by adjusting the Transformer Winding number of turn.But, in the application scenario not requiring electrical isolation, non-isolated multi input converter can omit transformer, not only facilitates reduction system bulk, improves system effectiveness, also reduces magnetic cell and uses the electromagnetic interference problem caused.But currently the research to non-isolated multi input converter is only limitted between input source and load can mutually transmit energy, and can not directly transmit energy between input source.It addition, once certain input source is deactivated, or the load of other input sources can be strengthened, or just make the voltage x current in load can not meet safe operation requirement, cause system-down, also can damage equipment time serious.Therefore the stability of this type of topology and flexibility are the strongest, utilization rate to new forms of energy is not the highest, range of application has bigger limitation, therefore seeks a kind of directly transmission energy and possessing that can realize between input source and compensates flexibly and the non-isolation type topology of fault-tolerant networks is significant.
Summary of the invention
Present invention aim at providing a kind of can realization directly transmit energy between input source and possess compensation flexibly and the non-isolation type three integrated current transformer of port connection in series-parallel of fault-tolerant networks.
For achieving the above object, have employed techniques below scheme: integrated current transformer of the present invention includes the first input dc power potential source Vin1, the second input dc power potential source Vin2, first input electric capacity of voltage regulation C1, second input electric capacity of voltage regulation C2, the first switch element, second switch unit, the 3rd switch element, the 4th switch element, output diode DO, inductance L, output capacitance C and load R；
Described first switch element includes diode D1With the first main switch S1；First input dc power potential source Vin1With electric capacity C1Parallel connection, electric capacity C1Cathode connecting diode D1Negative electrode, diode D1Anode connect the first main switch S1Colelctor electrode, the first main switch S1Emitter stage connect electric capacity C1Negative pole；
Described second switch unit includes diode D2With the second main switch S2；Second input dc power potential source Vin2With electric capacity C2Parallel connection, electric capacity C2Positive pole and the second main switch S2Colelctor electrode connect, electric capacity C2Negative pole and diode D2Anode connect, diode D2Negative electrode and the second main switch S2Emitter stage connect；Second main switch S2Emitter stage and the first main switch S1Colelctor electrode connect；
Described 3rd switch element includes diode D3With the 3rd main switch S3；3rd main switch S3Emitter stage and diode D3Anode connect, diode D3Negative electrode and second switch unit in the second main switch S2Colelctor electrode connect；3rd main switch S3Colelctor electrode respectively with one end and the output diode D of inductance LOAnode connect, the inductance L other end connects the first input dc power potential source V respectivelyin1Positive pole and diode D1Negative electrode；Output diode DONegative electrode connect respectively output capacitance C positive pole and load R one end, output capacitance C and load R the other end connect the second input dc power potential source V respectivelyin2Negative pole, diode D2Anode, electric capacity C2Negative electrode；
Described 4th switch element includes the 4th main switch S4With diode D4；4th main switch S4Emitter stage connect diode D4Anode, the 4th main switch S4Colelctor electrode connect the first input dc power potential source Vin1Negative pole；Diode D4Negative electrode connect the second input dc power potential source Vin2Negative pole.
Compared with prior art, present invention have the advantage that
1, only one of which magnetic inductive element in topology, effectively reduces system bulk and cost, and integrated level is high, it is possible to realizes the single-stage power conversion between each port, possesses higher system effectiveness；
2, have the series-parallel duty of input source concurrently, adapt to regenerative resource randomness and the feature of intermittent electric power, there is flexible compensation function；
3, the DIRECT ENERGY transmission of photovoltaic port and battery port, it is adaptable to battery tension, less than the occasion of load voltage, is effectively reduced the series connection number of battery, it is to avoid cause the danger of system crash because of single battery damage, be effectively improved system reliability；
4, may utilize in new forms of energy associating electric power system, reduce the unstable impact that load is brought of new energy, also improve the system utilization rate to new forms of energy simultaneously, meet environmental protection and energy saving requirement.
Accompanying drawing explanation
Fig. 1 is the electrical schematic diagram of the present invention；
Fig. 2 is present invention operation mode figure under dual input pattern；
Fig. 3 is present invention working waveform figure under dual input pattern；
Fig. 4 is present invention operation mode figure under dual output pattern；
Fig. 5 is present invention working waveform figure under dual output pattern；
Fig. 6 is present invention process chart under charge mode；
Fig. 7 is present invention working waveform figure under charge mode；
Fig. 8 is the energy management schematic diagram of the present invention.
Detailed description of the invention
The present invention will be further described with detailed description of the invention below in conjunction with the accompanying drawings.
In electrical schematic diagram of the present invention as shown in Figure 1, integrated current transformer of the present invention includes the first input dc power potential source Vin1, the second input dc power potential source Vin2, first input electric capacity of voltage regulation C1, second input electric capacity of voltage regulation C2, the first switch element, second switch unit, the 3rd switch element, the 4th switch element, output diode DO, inductance L, output capacitance C and load R；
Described first switch element includes diode D1With the first main switch S1；First input dc power potential source Vin1With electric capacity C1Parallel connection, electric capacity C1Cathode connecting diode D1Negative electrode, diode D1Anode connect the first main switch S1Colelctor electrode, the first main switch S1Emitter stage connect electric capacity C1Negative pole；
Described second switch unit includes diode D2With the second main switch S2；Second input dc power potential source Vin2With electric capacity C2Parallel connection, electric capacity C2Positive pole and the second main switch S2Colelctor electrode connect, electric capacity C2Negative pole and diode D2Anode connect, diode D2Negative electrode and the second main switch S2Emitter stage connect；Second main switch S2Emitter stage and the first main switch S1Colelctor electrode connect；
Described 3rd switch element includes diode D3With the 3rd main switch S3；3rd main switch S3Emitter stage and diode D3Anode connect, diode D3Negative electrode and second switch unit in the second main switch S2Colelctor electrode connect；3rd main switch S3Colelctor electrode respectively with one end and the output diode D of inductance LOAnode connect, the inductance L other end connects the first input dc power potential source V respectivelyin1Positive pole and diode D1Negative electrode；Output diode DONegative electrode connect respectively output capacitance C positive pole and load R one end, output capacitance C and load R the other end connect the second input dc power potential source V respectivelyin2Negative pole, diode D2Anode, electric capacity C2Negative electrode；
Described 4th switch element includes the 4th main switch S4With diode D4；4th main switch S4Emitter stage connect diode D4Anode, the 4th main switch S4Colelctor electrode connect the first input dc power potential source Vin1Negative pole；Diode D4Negative electrode connect the second input dc power potential source Vin2Negative pole.
In current transformer, the first input dc power potential source Vin1Meet the regenerative resource such as photovoltaic cell, wind power generation unit, the second input dc power potential source Vin2Meet the energy storage device such as battery, super capacitor, and Vin2<VO<Vin1.Assume that regenerative resource input power is Pin1, bearing power is Po.Assume to work as Pin1<PoTime, photovoltaic cell and battery power to the load jointly, and current transformer is equivalent to dual input converter (DIC).In this mode, the 3rd main switch S3With the 4th main switch S4Turn off, according to the first main switch S always1With the 2nd S2On off state, converter have 4 kinds switch mode.
Each mode equivalent circuit is as shown in Figure 2.
As shown in Figure 2 a, mode I the first main switch S1, the second main switch S2Conducting, now photovoltaic and battery series-fed, inductive current iLLinearly increasing.
As shown in Figure 2 b, mode II the first main switch S1Open-minded, the second main switch S2Turn off, inductive current iLIncrease in photovoltaic effect lower linear.
As shown in Figure 2 c, mode III the second main switch S2Open-minded, the first main switch S1Turn off, inductive current iLReduce in battery effect lower linear.
As shown in Figure 2 d, mode IV the first main switch S1, the second main switch S2It is both off, inductive current iLLinear reduction.
As it is shown on figure 3, the first main switch S1, the second main switch S2Dutycycle under dual input pattern is respectively d1、d2.Work as d1>d2Time, in a switch periods, converter experiences mode 1,2,4 successively；Work as d1<d2Time, in a switch periods, converter experiences mode 1,3,4 successively.Under this pattern, by regulating the first main switch S1Dutycycle d1Control photovoltaic power output, by regulating the second main switch S2Dutycycle d2Control the discharge power of battery, maintain load voltage stable.
Work as Pin1>PoTime, charging a battery while photovoltaic powering load, current transformer is equivalent to dual-output converter (DOC).In this mode, the second main switch S2With the 4th main switch S4Turn off, according to the first main switch S always1With the 3rd main switch S3On off state, converter have 3 kinds switch mode, each mode equivalent circuit is as shown in Figure 4.
As shown in fig. 4 a, mode I the first main switch S1, the 3rd main switch S3Conducting, photovoltaic is battery charging, inductive current iLLinearly increasing.
As shown in Figure 4 b, mode II the first main switch S1Open-minded, the 3rd main switch S3Turning off, photovoltaic is load supplying, inductive current iLLinearly increasing.
As illustrated in fig. 4 c, mode III the first main switch S1, the 3rd main switch S3It is both off, inductive current iLLinear reduction.
As it is shown in figure 5, the first main switch S1, the 3rd main switch S3Dutycycle under dual output pattern is respectively d1、d3.Under this pattern, by regulating the first main switch S1Dutycycle d1Control photovoltaic power output, by regulation the 3rd main switch S3Dutycycle d3Control the charge power of battery, maintain load voltage stable.
Energy, i.e. P can not be exported due to environmental factor or faults itself when photovoltaicin1When=0, battery and electric capacity C1Constitute connection in series-parallel form to power to the load, be the distinctive charge mode of current transformer.In this mode, the 3rd main switch S3Turn off, the second main switch S always2The most open-minded.According to the first main switch S1With the 4th main switch S4On off state, converter have 2 kinds switch mode, each mode equivalent circuit is as shown in Figure 6.
As shown in Figure 6 a, mode I the 4th main switch S4Conducting, the first main switch S1Turning off, battery passes through S while powering to the load2→D1→D4→S4The loop constituted is to electric capacity C1Charging, inductive current iLReduce in battery effect lower linear.
As shown in Figure 6 b, mode II the first main switch S1Conducting, the 4th main switch S4Turn off, battery and electric capacity C1Series connection powers to the load, inductive current iLLinear rise.
As it is shown in fig. 7, the first main switch S1Dutycycle under charge mode is d1.Under this pattern, by regulating the first main switch S1Dutycycle d1Maintain load voltage stable.
As shown in Figure 8, according to the energy management schematic diagram of the present invention, in the non-isolation type three integrated current transformer of port connection in series-parallel, master-slave control method is used to realize the input Power Distribution of two-way input source:
(1) when photovoltaic provide energy be insufficient for load need time, it is ensured that the photovoltaic energy that sends as much as possible, dump energy is supplemented by battery.Now, output terminals A o of multidiameter option switch MUX1 with MUX2, Bo, Co are connected with AX, BX, CX respectively.Current regulator is used for controlling S1Dutycycle d1, and then controlling photovoltaic power output, voltage regulator is used for controlling S2Dutycycle d2, thus regulated output voltage.
(2) when the energy that photovoltaic provides needs more than load, photovoltaic individually powers to the load, and dump energy is transmitted to battery.Now, output terminals A o of multidiameter option switch MUX1 with MUX2, Bo, Co are connected with AY, BY, CY respectively.Current regulator is used for controlling S1Dutycycle d1, and then controlling photovoltaic power output, voltage regulator is used for controlling S3Dutycycle d3, thus regulated output voltage.
(3) when photovoltaic can not export energy due to environmental factor or faults itself, bearing power is provided by battery completely, and electric capacity coordinates with power supply and powers to the load.Now, output terminals A o of multidiameter option switch MUX1 with MUX2, Bo, Co are connected with AZ, BZ, CZ respectively.Under this pattern, current regulator quits work, and is only made up of single closed-loop system voltage regulator.Now control S2Normal open, regulates S1Dutycycle to ensure output voltage stabilization, S4Driving signal produced by logic circuit.
Claims (1)
1. the non-isolation type three integrated current transformer of port connection in series-parallel, it is characterised in that: described integrated current transformer
Including the first input dc power potential source Vin1, the second input dc power potential source Vin2, first input electric capacity of voltage regulation C1、
Second input electric capacity of voltage regulation C2, the first switch element, second switch unit, the 3rd switch element, the 4th open
Close unit, output diode DO, inductance L, output capacitance C and load R；
Described first switch element includes diode D1With the first main switch S1；First input dc power potential source
Vin1With electric capacity C1Parallel connection, electric capacity C1Cathode connecting diode D1Negative electrode, diode D1Anode even
Meet the first main switch S1Colelctor electrode, the first main switch S1Emitter stage connect electric capacity C1Negative pole；
Described second switch unit includes diode D2With the second main switch S2；Second input dc power potential source
Vin2With electric capacity C2Parallel connection, electric capacity C2Positive pole and the second main switch S2Colelctor electrode connect, electric capacity C2's
Negative pole and diode D2Anode connect, diode D2Negative electrode and the second main switch S2Emitter stage connect；
Second main switch S2Emitter stage and the first main switch S1Colelctor electrode connect；
Described 3rd switch element includes diode D3With the 3rd main switch S3；3rd main switch S3Emitter stage
With diode D3Anode connect, diode D3Negative electrode and second switch unit in the second main switch S2's
Colelctor electrode connects；3rd main switch S3Colelctor electrode respectively with one end and the output diode D of inductance LOSun
Pole connects, and the inductance L other end connects the first input dc power potential source V respectivelyin1Positive pole and diode D1's
Negative electrode；Output diode DONegative electrode connect respectively output capacitance C positive pole and load R one end, output
The other end of the negative pole of electric capacity C and load R connects the second input dc power potential source V respectivelyin2Negative pole, two
Pole pipe D2Anode, electric capacity C2Negative pole；
Described 4th switch element includes the 4th main switch S4With diode D4；4th main switch S4Emitter stage
Connect diode D4Anode, the 4th main switch S4Colelctor electrode connect the first input dc power potential source Vin1's
Negative pole；Diode D4Negative electrode connect the second input dc power potential source Vin2Negative pole.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106026646B (en) * | 2016-07-23 | 2019-03-08 | 河北工业大学 | One kind non-isolated three port DC-DC converter and its application method |
| CN110855145B (en) * | 2019-11-19 | 2021-03-23 | 西南交通大学 | Three-port direct current converter and control method and circuit thereof |
| CN110838791B (en) * | 2019-11-19 | 2021-03-23 | 西南交通大学 | Two-switch three-port direct current converter and control method and circuit thereof |
| CN114274826A (en) * | 2021-12-24 | 2022-04-05 | 阳光电源股份有限公司 | Direct-current voltage output switching circuit, switching method and charging pile power module |
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| US8189351B2 (en) * | 2007-02-23 | 2012-05-29 | Astec International Limited | Multi-input DC/DC converters with zero-current switching |
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