CN104038049A - Non-isolated three-port serial-parallel integrated converter - Google Patents
Non-isolated three-port serial-parallel integrated converter Download PDFInfo
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- CN104038049A CN104038049A CN201410134366.8A CN201410134366A CN104038049A CN 104038049 A CN104038049 A CN 104038049A CN 201410134366 A CN201410134366 A CN 201410134366A CN 104038049 A CN104038049 A CN 104038049A
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- main switch
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- capacitor
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Abstract
The invention discloses a non-isolated three-port serial-parallel integrated converter topology, which belongs to the field of power electronic conversion technologies. The integrated converter comprises input DC voltage sources Vin1 and Vin2, voltage-stabilizing capacitors C1 and C2, a first switch unit, a second switch unit, a third switch unit, a fourth switch unit, an output diode DO, an inductor L, an output capacitor C and a load R, wherein each input side is connected to an energy-storage capacitor in parallel, and meanwhile, two input sources are connected through introduction of the fourth switch unit. When photovoltaic energy quits working, the capacitor at the photovoltaic side is discontinuously charged through an introduced switch tube, and the input voltage at the side remains stable, so that stability of the load voltage is guaranteed; and when the photovoltaic energy is sufficient, the direct energy transfer between a photovoltaic port and a port of a storage battery is implemented, so that the utilization rate of the new energy is improved. The non-isolated three-port serial-parallel integrated converter has the advantages of small volume, low cost, high integration level, capabilities of implementing power conversion between the ports and flexibly compensating, high system stability and reliability and the like.
Description
Technical field
Technics of Power Electronic Conversion technical field involved in the present invention, the integrated current transformer of especially a kind of three port connection in series-parallel.
Background technology
Along with power demand increases gradually, 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 has simultaneously caused serious environmental pollution.Because new forms of energy have cleanliness without any pollution, resourceful feature, therefore utilizing generation of electricity by new energy is an important channel that solves contradiction between energy development and environmental protection.The more generation of electricity by new energy form of application has wind power generation, photovoltaic generation, fuel cell power generation, geothermal power generation and tidal power generation etc. at present, but because these energy are affected by environment and regional limits is larger, its supply of electric power is unstable, discontinuous, so conventionally combine thering are complementary multiple new forms of energy, and be 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 needs a DC/DC converter conventionally, and the various energy is become to direct current output, is connected in parallel on public DC bus, supply with DC load, but its structure is more complicated, and cost is higher.In addition from control angle, each converter in independent control, also to guarantee and other port between co-ordination, therefore when actual motion, must set up the communication network between each port, this can increase the complexity of system.
In order to realize concentrated controling management, the new energy system based on many input translators is more and more paid close attention to and is applied.Many input translators can be divided into isolated form and non-isolation type two classes topology.The high-frequency isolation transformer that adopts the many input translators of isolated form realizes the electrical isolation of a plurality of input sources and load more, realizes the coupling of the different electric pressures of input source by adjusting the Transformer Winding number of turn.Yet in the application scenario that does not require electrical isolation, the many input translators of non-isolation can omit transformer, not only contribute to reduce system bulk, improve system effectiveness, also reduce magnetic cell and used the electromagnetic interference problem causing.But the current research to the many input translators of non-isolation only limits between input source and load transferring energy mutually, and direct transferring energy between input source.In addition, once certain input source is deactivated, or can strengthen the load of other input sources, or just make the electric current and voltage in load can not meet safe operation requirement, cause system-down, also can damage equipment when serious.So the stability of class topology and flexibility are not strong, to the utilance of new forms of energy, not very high, range of application has larger limitation, therefore seek a kind of can realize between input source direct transferring energy and possess the non-isolation type topology of compensation flexibly and fault-tolerant networks significant.
Summary of the invention
The object of the invention is to provide a kind of integrated current transformer of non-isolation type three port connection in series-parallel that can realize between input source direct transferring energy and possess compensation flexibly and fault-tolerant networks.
For achieving the above object, adopted following technical scheme: integrated current transformer of the present invention comprises the first input dc power potential source V
in1, the second input dc power potential source V
in2, the first input electric capacity of voltage regulation C
1, the second input electric capacity of voltage regulation C
2, the first switch element, second switch unit, the 3rd switch element, the 4th switch element, output diode D
o, inductance L, output capacitance C and load R;
Described the first switch element comprises diode D
1with the first main switch S
1; The first input dc power potential source V
in1with capacitor C
1parallel connection, capacitor C
1cathode connecting diode D
1negative electrode, diode D
1anodic bonding the first main switch S
1collector electrode, the first main switch S
1emitter connect capacitor C
1negative pole;
Described second switch unit comprises diode D
2with the second main switch S
2; The second input dc power potential source V
in2with capacitor C
2parallel connection, capacitor C
2positive pole and the second main switch S
2collector electrode connect, capacitor C
2negative pole and diode D
2anodic bonding, diode D
2negative electrode and the second main switch S
2emitter connect; The second main switch S
2emitter and the first main switch S
1collector electrode connect;
Described the 3rd switch element comprises diode D
3with the 3rd main switch S
3; The 3rd main switch S
3emitter and diode D
3anodic bonding, diode D
3negative electrode and second switch unit in the second main switch S
2collector electrode connect; The 3rd main switch S
3collector electrode respectively with one end and the output diode D of inductance L
oanodic bonding, the inductance L other end connects respectively the first input dc power potential source V
in1positive pole and diode D
1negative electrode; Output diode D
onegative electrode connect respectively one end of positive pole and the load R of output capacitance C, the other end of output capacitance C and load R is connected respectively the second input dc power potential source V
in2negative pole, diode D
2anode, capacitor C
2negative electrode;
Described the 4th switch element comprises the 4th main switch S
4with diode D
4; The 4th main switch S
4emitter connect diode D
4anode, the 4th main switch S
4collector electrode connect the first input dc power potential source V
in1negative pole; Diode D
4negative electrode connect the second input dc power potential source V
in2negative pole.
Compared with prior art, tool of the present invention has the following advantages:
1, in topology, only have a magnetic inductance element, effectively reduce system bulk and cost, integrated level is high, can realize the single-stage power conversion between each port, possesses higher system effectiveness;
2, have the series-parallel operating state of input source concurrently, adapt to the feature of regenerative resource randomness and intermittent generating, there is flexible compensation function;
3, the DIRECT ENERGY transmission of photovoltaic port and storage battery port, be applicable to the occasion that battery tension is less than load voltage, can effectively reduce the series connection number of storage battery, avoid causing because of single battery damage the danger of system crash, effectively improve system reliability;
4, can utilize in new forms of energy associating electric power system, reduce the unstable impact that load is brought of new energy, also improve the utilance of system to new forms of energy, meet environmental protection and energy saving requirement simultaneously.
Accompanying drawing explanation
Fig. 1 is electrical schematic diagram of the present invention;
Fig. 2 is the operation mode figure of the present invention under dual input pattern;
Fig. 3 is the working waveform figure of the present invention under dual input pattern;
Fig. 4 is the operation mode figure of the present invention under dual output pattern;
Fig. 5 is the working waveform figure of the present invention under dual output pattern;
Fig. 6 is the process chart of the present invention under charge mode;
Fig. 7 is the working waveform figure of the present invention under charge mode;
Fig. 8 is energy management schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention will be further described.
In electrical schematic diagram of the present invention as shown in Figure 1, integrated current transformer of the present invention comprises the first input dc power potential source V
in1, the second input dc power potential source V
in2, the first input electric capacity of voltage regulation C
1, the second input electric capacity of voltage regulation C
2, the first switch element, second switch unit, the 3rd switch element, the 4th switch element, output diode D
o, inductance L, output capacitance C and load R;
Described the first switch element comprises diode D
1with the first main switch S
1; The first input dc power potential source V
in1with capacitor C
1parallel connection, capacitor C
1cathode connecting diode D
1negative electrode, diode D
1anodic bonding the first main switch S
1collector electrode, the first main switch S
1emitter connect capacitor C
1negative pole;
Described second switch unit comprises diode D
2with the second main switch S
2; The second input dc power potential source V
in2with capacitor C
2parallel connection, capacitor C
2positive pole and the second main switch S
2collector electrode connect, capacitor C
2negative pole and diode D
2anodic bonding, diode D
2negative electrode and the second main switch S
2emitter connect; The second main switch S
2emitter and the first main switch S
1collector electrode connect;
Described the 3rd switch element comprises diode D
3with the 3rd main switch S
3; The 3rd main switch S
3emitter and diode D
3anodic bonding, diode D
3negative electrode and second switch unit in the second main switch S
2collector electrode connect; The 3rd main switch S
3collector electrode respectively with one end and the output diode D of inductance L
oanodic bonding, the inductance L other end connects respectively the first input dc power potential source V
in1positive pole and diode D
1negative electrode; Output diode D
onegative electrode connect respectively one end of positive pole and the load R of output capacitance C, the other end of output capacitance C and load R is connected respectively the second input dc power potential source V
in2negative pole, diode D
2anode, capacitor C
2negative electrode;
Described the 4th switch element comprises the 4th main switch S
4with diode D
4; The 4th main switch S
4emitter connect diode D
4anode, the 4th main switch S
4collector electrode connect the first input dc power potential source V
in1negative pole; Diode D
4negative electrode connect the second input dc power potential source V
in2negative pole.
In current transformer, the first input dc power potential source V
in1connect the regenerative resources such as photovoltaic cell, wind power generation unit, the second input dc power potential source V
in2connect the energy storage devices such as storage battery, super capacitor, and V
in2<V
o<V
in1.Suppose that regenerative resource input power is P
in1, bearing power is P
o.Suppose to work as P
in1<P
otime, photovoltaic cell and storage battery power to the load jointly, and current transformer is equivalent to dual input converter (DIC).Under this pattern, the 3rd main switch S
3with the 4th main switch S
4turn-off, according to the first main switch S always
1with the 2nd S
2on off state, converter has 4 kinds of switch mode.
Each mode equivalent electric circuit as shown in Figure 2.
Mode I: as shown in Figure 2 a, the first main switch S
1, the second main switch S
2conducting, now photovoltaic and storage battery series-fed, inductive current i
llinear increasing.
Mode II: as shown in Figure 2 b, the first main switch S
1open-minded, the second main switch S
2turn-off inductive current i
lin photovoltaic effect lower linear, increase.
Mode III: as shown in Figure 2 c, the second main switch S
2open-minded, the first main switch S
1turn-off inductive current i
lin storage battery effect lower linear, reduce.
Mode IV: as shown in Figure 2 d, the first main switch S
1, the second main switch S
2all turn-off inductive current i
llinearity reduces.
As shown in Figure 3, the first main switch S
1, the second main switch S
2duty ratio under dual input pattern is respectively d
1, d
2.Work as d
1>d
2time, in a switch periods, converter experiences mode 1,2,4 successively; Work as d
1<d
2time, in a switch periods, converter experiences mode 1,3,4 successively.Under this pattern, by regulating the first main switch S
1duty ratio d
1control photovoltaic power output, by regulating the second main switch S
2duty ratio d
2control the discharge power of storage battery, maintain load voltage stable.
Work as P
in1>P
otime, in the time of photovoltaic powering load, charging a battery, current transformer is equivalent to dual-output converter (DOC).Under this pattern, the second main switch S
2with the 4th main switch S
4turn-off, according to the first main switch S always
1with the 3rd main switch S
3on off state, converter has 3 kinds of switch mode, each mode equivalent electric circuit as shown in Figure 4.
Mode I: as shown in Fig. 4 a, the first main switch S
1, the 3rd main switch S
3conducting, photovoltaic is charge in batteries, inductive current i
llinear increasing.
Mode II: as shown in Figure 4 b, the first main switch S
1open-minded, the 3rd main switch S
3turn-off, photovoltaic is load supplying, inductive current i
llinear increasing.
Mode III: as shown in Fig. 4 c, the first main switch S
1, the 3rd main switch S
3all turn-off inductive current i
llinearity reduces.
As shown in Figure 5, the first main switch S
1, the 3rd main switch S
3duty ratio under dual output pattern is respectively d
1, d
3.Under this pattern, by regulating the first main switch S
1duty ratio d
1control photovoltaic power output, by regulating the 3rd main switch S
3duty ratio d
3control the charge power of storage battery, maintain load voltage stable.
When photovoltaic is because environmental factor or faults itself can not be exported energy, i.e. P
in1=0 o'clock, storage battery and capacitor C
1forming connection in series-parallel form and power to the load, is the distinctive charge mode of current transformer.Under this pattern, the 3rd main switch S
3turn-off the second main switch S always
2always open-minded.According to the first main switch S
1with the 4th main switch S
4on off state, converter has 2 kinds of switch mode, each mode equivalent electric circuit as shown in Figure 6.
Mode I: as shown in Figure 6 a, the 4th main switch S
4conducting, the first main switch S
1turn-off, when storage battery powers to the load, pass through S
2→ D
1→ D
4→ S
4the loop forming is to capacitor C
1charging, inductive current i
lin storage battery effect lower linear, reduce.
Mode II: as shown in Figure 6 b, the first main switch S
1conducting, the 4th main switch S
4turn-off storage battery and capacitor C
1series connection powers to the load, inductive current i
llinear rising.
As shown in Figure 7, the first main switch S
1duty ratio under charge mode is d
1.Under this pattern, by regulating the first main switch S
1duty ratio d
1maintain load voltage stable.
As shown in Figure 8, according to energy management schematic diagram of the present invention, in the integrated current transformer of non-isolation type three port connection in series-parallel, adopt master-slave control method to realize the input Power Distribution of two-way input source:
(1) energy shortage providing when photovoltaic when meeting load needs, guarantees the photovoltaic energy that sends as much as possible, and dump energy is supplemented by storage battery.Now, the output terminals A of multidiameter option switch MUX1 and MUX2
o, B
o, C
obe connected with AX, BX, CX respectively.Current regulator is used for controlling S
1duty ratio d
1, and then control photovoltaic power output, voltage regulator is used for controlling S
2duty ratio d
2thereby, regulated output voltage.
(2) when the energy providing when photovoltaic is greater than load and needs, photovoltaic powers to the load separately, and dump energy is to storage battery transmission.Now, the output terminals A of multidiameter option switch MUX1 and MUX2
o, B
o, C
obe connected with AY, BY, CY respectively.Current regulator is used for controlling S
1duty ratio d
1, and then control photovoltaic power output, voltage regulator is used for controlling S
3duty ratio d
3thereby, regulated output voltage.
(3) when photovoltaic can not be exported energy due to environmental factor or faults itself, bearing power is provided by storage battery completely, and electric capacity coordinates and powers to the load with power supply.Now, the output terminals A of multidiameter option switch MUX1 and MUX2
o, B
o, C
obe connected with AZ, BZ, CZ respectively.Under this pattern, current regulator quits work, and only by voltage regulator, forms single closed-loop system.Now control S
2normal open, regulates S
1duty ratio to guarantee output voltage stabilization, S
4driving signal by logical circuit, produced.
Claims (1)
1. the integrated current transformer of non-isolation type three port connection in series-parallel, is characterized in that: described integrated current transformer comprises the first input dc power potential source V
in1, the second input dc power potential source V
in2, the first input electric capacity of voltage regulation C
1, the second input electric capacity of voltage regulation C
2, the first switch element, second switch unit, the 3rd switch element, the 4th switch element, output diode D
o, inductance L, output capacitance C and load R;
Described the first switch element comprises diode D
1with the first main switch S
1; The first input dc power potential source V
in1with capacitor C
1parallel connection, capacitor C
1cathode connecting diode D
1negative electrode, diode D
1anodic bonding the first main switch S
1collector electrode, the first main switch S
1emitter connect capacitor C
1negative pole;
Described second switch unit comprises diode D
2with the second main switch S
2; The second input dc power potential source V
in2with capacitor C
2parallel connection, capacitor C
2positive pole and the second main switch S
2collector electrode connect, capacitor C
2negative pole and diode D
2anodic bonding, diode D
2negative electrode and the second main switch S
2emitter connect; The second main switch S
2emitter and the first main switch S
1collector electrode connect;
Described the 3rd switch element comprises diode D
3with the 3rd main switch S
3; The 3rd main switch S
3emitter and diode D
3anodic bonding, diode D
3negative electrode and second switch unit in the second main switch S
2collector electrode connect; The 3rd main switch S
3collector electrode respectively with one end and the output diode D of inductance L
oanodic bonding, the inductance L other end connects respectively the first input dc power potential source V
in1positive pole and diode D
1negative electrode; Output diode D
onegative electrode connect respectively one end of positive pole and the load R of output capacitance C, the other end of output capacitance C and load R is connected respectively the second input dc power potential source V
in2negative pole, diode D
2anode, capacitor C
2negative electrode;
Described the 4th switch element comprises the 4th main switch S
4with diode D
4; The 4th main switch S
4emitter connect diode D
4anode, the 4th main switch S
4collector electrode connect the first input dc power potential source V
in1negative pole; Diode D
4negative electrode connect the second input dc power potential source V
in2negative pole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410134366.8A CN104038049B (en) | 2014-04-04 | 2014-04-04 | The integrated current transformer of non-isolation type three port connection in series-parallel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410134366.8A CN104038049B (en) | 2014-04-04 | 2014-04-04 | The integrated current transformer of non-isolation type three port connection in series-parallel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104038049A true CN104038049A (en) | 2014-09-10 |
| CN104038049B CN104038049B (en) | 2016-08-17 |
Family
ID=51468692
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410134366.8A Expired - Fee Related CN104038049B (en) | 2014-04-04 | 2014-04-04 | The integrated current transformer of non-isolation type three port connection in series-parallel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104038049B (en) |
Cited By (4)
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| CN106026646A (en) * | 2016-07-23 | 2016-10-12 | 河北工业大学 | Non-isolated three-port DC-DC converter and use method thereof |
| CN110838791A (en) * | 2019-11-19 | 2020-02-25 | 西南交通大学 | Two-switch three-port direct current converter and control method and circuit thereof |
| CN110855145A (en) * | 2019-11-19 | 2020-02-28 | 西南交通大学 | 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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| 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 |
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| 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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