CN101534055B - Single-isolation pressure increase and reduction type multi-input direct current converter - Google Patents

Single-isolation pressure increase and reduction type multi-input direct current converter Download PDF

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CN101534055B
CN101534055B CN2009101114649A CN200910111464A CN101534055B CN 101534055 B CN101534055 B CN 101534055B CN 2009101114649 A CN2009101114649 A CN 2009101114649A CN 200910111464 A CN200910111464 A CN 200910111464A CN 101534055 B CN101534055 B CN 101534055B
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陈道炼
陈亦文
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Fuzhou University
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Abstract

The invention relates to a single-isolation pressure increase and reduction type multi-input direct current converter, wherein the circuit structure is formed by connecting one multi-input single-output high-frequency inverter circuit, a plurality of common-ground input LC filters and one common output high-frequency isolation transformation energy-storage commutation filter circuit, wherein each input end of the multi-input single-output high-frequency inverter circuit is correspondingly connected with the output end of each input LC filter and the output end of the multi-input single-output high-frequency inverter circuit is connected with the input end of the high-frequency transformer. The converter has features of input direct current power supply common-ground, no insulation between the high-frequency inverter circuits, insulation between output and input, strong voltage match capability, time-sharing power supply of multi-input power supply, simplest circuit topology, common use of output high-frequency transformer and energy-storage commutation filter circuit, high power density, high conversion efficiency, high reliability of load short circuit and low cost, as the key technique for a middle small capacitance distribution type power supply system of various renewable energy resources.

Description

Single-isolation pressure increase and reduction type multi-input direct current converter
Technical field
Single-isolation pressure increase and reduction type multi-input direct current converter involved in the present invention belongs to the Technics of Power Electronic Conversion technology.
Background technology
DC converter is the applied power semiconductor device, and a kind of direct current energy is transformed into the static converting means of another kind of direct current energy, uses for DC load.The converter of high frequency electrical isolation is arranged between output DC load and input DC power, be called isolated DC transducer.The high frequency electrical isolation element has mainly played following effect in converter: 1) realized the electrical isolation between converter output and the input, improved the security reliability and the Electro Magnetic Compatibility of converter operation; 2) realized coupling between converter output voltage and the input voltage, realized promptly that the output voltage of converter can be higher than, be equal to or less than the technique effect of input voltage that its range of application has obtained widening greatly; 3) when the operating frequency of high frequency transformer or high frequency storage transformer when 20kHz is above, its volume, weight greatly reduce, audio noise has been eliminated.Therefore, be the secondary transformation of electrical energy occasion of main dc power supply with DC generator, storage battery, solar cell and fuel cell etc., isolated DC transducer has important use and is worth.
Regenerative resources (being also referred to as green energy resource) such as solar energy, wind energy, tidal energy and geothermal energy have cleanliness without any pollution, cheapness, advantage such as reliable, abundant, thereby are with a wide range of applications.Because fossil energy (the non-renewable energy) growing tensions such as oil, coal and natural gas, environmental pollution are serious, cause the production of global warming and nuclear energy can produce reasons such as nuke rubbish and contaminated environment again, the development and utilization of regenerative resource more and more is subject to people's attention.Renewable energy power generation mainly contains types such as photovoltaic, wind-force, fuel cell, waterpower, underground heat, all exist the supply of electric power instability, discontinuous, with defectives such as weather conditions variations, therefore need to adopt various energy resources to unite the distributed power supply system of power supply.
Traditional regenerative resource distributed power supply system, as shown in Figure 1.This system normally adopts a plurality of single input DC converter that the direct current of renewable energy power generation equipment such as solar cell, fuel cell, wind-driven generator output is transformed into the needed common DC bus voltage U of load converter Dc, and then by the load converter that links to each other with dc bus with U DcBe transformed into needed direct current of load or alternating voltage, select the type of load converter according to the character of load.In order to make the renewable energy power generation part can co-ordination, various energy resources must carry out respectively being connected on the public dc bus behind the transformation of electrical energy, therefore need a plurality of single input DC converter and in addition in parallel, thereby have defectives such as circuit structure complexity, cost height at output.
In order to simplify circuit structure, can replace a plurality of single input DC converter with a multi-input direct current converter, form novel regenerative resource distributed power supply system, as shown in Figure 2.Multi-input direct current converter allows the various energy resources input, and the character of input source, amplitude and characteristic can be identical, and is also can difference very big.This electric power system has that circuit structure is succinct, cost is low, in HF switch cycle a plurality of input sources can be simultaneously or timesharing powers to the load, can improve system stability and flexibility, can realize the advantages such as preferential utilization of the energy.
Therefore, seeking a class, to allow multiple regenerative resource to unite the multi-input direct current converter of power supply extremely urgent, for the simplified system circuit structure, reduce cost, allow a HF switch in the cycle a plurality of input sources simultaneously or the timesharing preferential utilization that powers to the load, improve the stability of system and flexibility, realization regenerative resource will have crucial meaning.
Summary of the invention
The present invention seeks to provide a kind of have input DC power altogether, do not isolate, export between the high-frequency inverter circuit and import isolation, voltage matches ability by force, the double-isolation boosting and step-down multi-input direct current convertor of reliability height when importing power supply time sharing power supply, circuit topology the most succinct, shared output high frequency storage transformer and current rectifying and wave filtering circuit, power density height, conversion efficiency height, load short circuits, characteristics such as cost is low, application prospect is extensive more.
Single-isolation pressure increase and reduction type multi-input direct current converter of the present invention, be a plurality of input LC filter and shared output high-frequency isolation energy storage transformation current rectifying and wave filtering circuit connections altogether to be constituted by the single output of input more than high-frequency inverter circuit, each input of the single output of many inputs high-frequency inverter circuit and the corresponding one by one connection of output of each input LC filter, the output of the single output of many inputs high-frequency inverter circuit and the input of high frequency storage transformer link, the single output of described many inputs high-frequency inverter circuit is made of a plurality of single output of single input high-frequency inverter circuits of selecting power switch that have, the effect at any time of described many input single output high-frequency inverter circuits is equivalent to the single output of a single input high-frequency inverter circuit, and described output high-frequency isolation energy storage transformation current rectifying and wave filtering circuit is by the high frequency storage transformer, hf rectifier, output filter capacitor cascade in regular turn constitutes.
The present invention is with a plurality of single input DC converter circuit structure of output parallel connection in traditional regenerative resource distributed power supply system, be configured to the single-isolation pressure increase and reduction type multi-input direct current converter circuit structure, proposed single-isolation pressure increase and reduction type multi-input direct current converter new ideas, circuit structure and topological family.
Single-isolation pressure increase and reduction type multi-input direct current converter of the present invention, can with a plurality of altogether, unsettled input direct voltage is transformed into a required voltage size, stable, high-quality output dc voltage has input DC power altogether, do not isolate between the high-frequency inverter circuit, output is isolated with input, the voltage matches ability is strong, many input power supply time sharing power supplies, circuit topology is the most succinct, shared output high frequency storage transformer and current rectifying and wave filtering circuit, the power density height, the conversion efficiency height, reliability height during load short circuits, cost is low, characteristics such as application prospect is extensive.The combination property of single-isolation pressure increase and reduction type multi-input direct current converter will be more superior than a plurality of single input DC converter of traditional output parallel connection.
Description of drawings
Fig. 1. traditional regenerative resource distributed power supply system.
Fig. 2. novel regenerative resource distributed power supply system.
Fig. 3. the single-isolation pressure increase and reduction type multi-input direct current converter theory diagram.
Fig. 4. the single-isolation pressure increase and reduction type multi-input direct current converter circuit structure diagram.
Fig. 5. principle oscillogram during the single-isolation pressure increase and reduction type multi-input direct current converter time sharing power supply.
Fig. 6. single-isolation pressure increase and reduction type multi-input direct current converter circuit topology example one---two-tube reverse excitation circuit schematic diagram.
Fig. 7. single-isolation pressure increase and reduction type multi-input direct current converter circuit topology example two---the two-tube reverse excitation circuit schematic diagram of paralleling and interleaving.
Fig. 8. single-isolation pressure increase and reduction type multi-input direct current converter circuit topology example three---paralleling and interleaving single tube reverse excitation circuit schematic diagram.
Fig. 9. master-slave mode voltage, current instantaneous value FEEDBACK CONTROL block diagram during the single-isolation pressure increase and reduction type multi-input direct current converter time sharing power supply.
Figure 10. master-slave mode voltage, current instantaneous value feedback control principle oscillogram during the single-isolation pressure increase and reduction type multi-input direct current converter time sharing power supply.
Embodiment
Below in conjunction with drawings and Examples the present invention is described further.
The single-isolation pressure increase and reduction type multi-input direct current converter circuit structure, be a plurality of input LC filter and shared output high-frequency isolation energy storage transformation current rectifying and wave filtering circuit connections altogether to be constituted by the single output of input more than high-frequency inverter circuit, each input of the single output of many inputs high-frequency inverter circuit and the corresponding one by one connection of output of each input LC filter, the output of the single output of many inputs high-frequency inverter circuit and the input of high frequency storage transformer link, the single output of described many inputs high-frequency inverter circuit is made of a plurality of single output of single input high-frequency inverter circuits of selecting power switch that have, the effect at any time of described many input single output high-frequency inverter circuits is equivalent to the single output of a single input high-frequency inverter circuit, and described output high-frequency isolation energy storage transformation current rectifying and wave filtering circuit is by the high frequency storage transformer, hf rectifier, output filter capacitor cascade in regular turn constitutes.
Principle waveform when single-isolation pressure increase and reduction type multi-input direct current converter theory diagram, circuit structure, time sharing power supply is respectively shown in Fig. 3,4,5.Because single-isolation pressure increase and reduction type multi-input direct current converter is a current type converter, its principle is equivalent to the stack of a plurality of buck-boost type list input DC converter at the input electric current, i.e. output voltage U.With input direct voltage (U I1, U I2..., U In), the high frequency storage transformer turn ratio (N 2/ N 1), duty ratio (D 1, D 2..., D n) between the pass be U o=(D 1U I1+ D 2U I2+ ... + D nU In) N 2/ [N 1(1-D 1-D 2-...-D n)].U。At suitable duty ratio (D 1, D 2..., D n) and the high frequency storage transformer turn ratio (N 2/ N 1) time can greater than, be equal to or less than U I1+ U I2+ ... + U InSo the high frequency storage transformer in this quasi-converter circuit structure has not only played security reliability and the Electro Magnetic Compatibility that improves the converter operation, the more important thing is the effect of having played matched output voltage and input voltage, realized that promptly the output voltage of converter is higher than, be equal to or less than input direct voltage sum U I1+ U I2+ ... + U InTechnique effect, its range of application has obtained widening greatly.As 0.5<D 1+ D 2+ ... + D n<1 or 0<D 1+ D 2+ ... + D n, there is U respectively at<0.5 o'clock.>(U I1+ U I2+ ... + U In) N 2/ N 1Or U.<(U I1+ U I2+ ... + U In) N 2/ N 1, i.e. output dc voltage U.Be higher or lower than input direct voltage (U I1, U I2..., U In) and the high frequency storage transformer turn ratio (N 2/ N 1) the sum of products (U I1+ U I2+ ... + U In) N 2/ N 1Owing to do not isolate between the high-frequency inverter circuit of converter, isolate mutually between converter output DC load and the input power supply, again so this quasi-converter is called single-isolation pressure increase and reduction type multi-input direct current converter.High-frequency inverter in this circuit structure is made of a plurality of two quadrant high frequency power switches that can bear bi-directional voltage stress, unidirectional current stress, and hf rectifier is made of one or more high-frequency rectification diodes.N input source of this circuit structure can only be powered to DC load in the cycle a HF switch in timesharing, and duty ratio can identical (D 1=D 2=...=D n), also can different (D 1≠ D 2≠ ... ≠ D n).
When power supply during to load transfer power, high-frequency inverter is modulated into input direct voltage has n the different rates of rise (the ratio U of input direct voltage and the former limit of high frequency storage transformer inductance I1/ L 1, U I2/ L 1..., U In/ L 1) the high frequency pulse dc current i N1, through high frequency storage transformer T (T 1, T 2) after electrical isolation, transmission and the currents match, behind high-frequency rectification, capacitive filter, obtain high-quality direct voltage U again., the high frequency pulse dc current i N1Timesharing is through n input LC filter L altogether I1--C I1, L I2-C I2..., L In-C InThe back is at input DC power U I1, U I2..., U InThe input dc power stream I that middle acquisition is level and smooth I1, I I2..., I In
Single-isolation pressure increase and reduction type multi-input direct current converter of the present invention, because a shared high frequency storage transformer and an output rectifier and filter, a plurality of single input DC converter circuit structures in parallel with output in the traditional regenerative resource distributed power supply system exist important difference.Therefore, converter of the present invention is creative, have between the high-frequency inverter circuit do not isolate, export and import between reliability height when isolation, conversion efficiency height (meaning that energy loss is little), power density height (mean volume, weight little), load short circuits, characteristics such as cost is low, application prospect is extensive, build today energy-saving, conservation-minded society vigorously advocating, have more important value.
The single-isolation pressure increase and reduction type multi-input direct current converter circuit topology embodiment of family is shown in Fig. 6,7,8.Fig. 6 is two-tube reverse excitation circuit, and Fig. 7 is the two-tube reverse excitation circuit of paralleling and interleaving, and Fig. 8 is a paralleling and interleaving single tube reverse excitation circuit.Clamping diode circuit among Fig. 6,7 is to be used for suppressing the due to voltage spikes that the former limit of high frequency storage transformer leakage inductance causes.From the high-frequency inverter side, the voltage stress of two-tube inverse-excitation type, the two-tube reverse excitation circuit high frequency power of paralleling and interleaving switch is input voltage value (U I1, U I2..., U In), the voltage stress of paralleling and interleaving single tube reverse excitation circuit high frequency power switch is input voltage value and converts the output voltage values sum (U on former limit I1+ U 0N 1/ N 2, U I2+ U 0N 1/ N 2..., U In+ U 0N 1/ N 2); From the output hf rectifier, the voltage stress of high-frequency rectification diode is output voltage values and the maximum sum [U that converts the input voltage of secondary 0+ max (U I1N 2/ N 1, U I2N 2/ N 1..., U InN 2/ N 1)].Two-tube inverse-excitation type, the two-tube reverse excitation circuit of paralleling and interleaving are applicable to high pressure input conversion occasion; Paralleling and interleaving single tube reverse excitation circuit is applicable to low pressure input conversion occasion.Two-tube reverse excitation circuit is applicable to small-power conversion occasion, and the two-tube inverse-excitation type of paralleling and interleaving, paralleling and interleaving single tube reverse excitation circuit are applicable to middle Power Conversion occasion.This circuit topology family be applicable to a plurality of altogether, unsettled input direct voltage is transformed into a required voltage size, stable, high-quality output dc voltage, can be used to realize to have the multi-input direct current converter in the novel renewable energy middle low power distributed power supply system of premium properties and wide application prospect, as photovoltaic cell 40-60VDC/360VDC, 10kw Proton Exchange Membrane Fuel Cells 85-120V/360VDC, middle-size and small-size family wind power generation 24-36-48VDC/360VDC, multiple input sources such as large-scale wind generating 1000VDC/360VDC are powered to DC load.
Single-isolation pressure increase and reduction type multi-input direct current converter can be used to realize the time sharing power supply of various energy resources, can adopt the 1st, 2 ..., n-1 road power output is fixed and the n road replenishes master-slave mode voltage, the current instantaneous value feedback control strategy of the required deficit power of load, its control block diagram and control principle waveform are respectively shown in Fig. 9,10.With converter 1,2 ..., n-1 input current feedback signal I I1f, I I2f..., I I (n-1) fRespectively with reference current I I1r, I I2r..., I I (n-1) rCompare, its error signal has obtained error current amplifying signal I behind proportional and integral controller 1e, I 2e..., I (n-1) e, with the output voltage feedback signal U of converter OfWith reference voltage U rCompare, its error signal has obtained error voltage amplifying signal U behind proportional and integral controller e, I 1e, I 2e..., I (n-1) e, U eRespectively with zigzag carrier wave u cHand over and cut, obtained pwm signal u Hf1, u Hf2..., u HfnAnd reverse signal u Hf12, u Hf22..., u Hfn2u Hf1Respectively with trailing edge two divided-frequency signal u SyAnd reverse signal With, behind drive circuit, obtain power switch S 12, S 11Drive signal; u Hf2..., u HfnRespectively with u Hf1, u Hf2..., u Hfn-1Reverse signal with the back, more respectively with u Sy,
Figure GSB00000216491200052
With, behind drive circuit, obtain power switch S 22And S 21, S 32And S 31, S N2And S N1Drive signal; With u HfnRespectively with u Sy,
Figure GSB00000216491200053
With behind drive circuit, obtain power switch S 3, S 4Drive signal.
Therefore, when input voltage or load variations, by regulating reference voltage U rWith reference current I I1r, I I2r..., I I (n-1) r, promptly regulated error voltage signal U eWith error current signal I 1e, I 2e..., I (n-1) eChange duty ratio D 1, D 2..., D n, just can realize the stable of single-isolation pressure increase and reduction type multi-input direct current converter output voltage, input current (power output) and regulate.
For two-tube reverse excitation circuit shown in Figure 6, duty ratio (D 1, D 2..., D n) be exactly the duty ratio of corresponding power switch, i.e. D 1=T ONi/ T S, D 2=T ON2/ T S..., D n=T ONn/ T S(T SBe the HF switch cycle); For the two-tube inverse-excitation type of paralleling and interleaving shown in Fig. 7,8, paralleling and interleaving single tube reverse excitation circuit, duty ratio (D 1, D 2..., D n) be exactly the twice of corresponding power switch duty ratio, i.e. D 1=T ON1/ (T S/ 2), D 2=T ON2/ (T S/ 2) ..., D n=T ONn/ (T S/ 2).

Claims (2)

1. single-isolation pressure increase and reduction type multi-input direct current converter, it is characterized in that: this converter is made of a plurality of input LC filter and shared output high-frequency isolation energy storage transformation current rectifying and wave filtering circuit connections altogether the single output of input more than high-frequency inverter circuit, each input of the single output of many inputs high-frequency inverter circuit and the corresponding one by one connection of output of each input LC filter, the output of the single output of many inputs high-frequency inverter circuit and the input of high frequency storage transformer link, the single output of described many inputs high-frequency inverter circuit is made of a plurality of single output of single input high-frequency inverter circuits of selecting power switch that have, the effect at any time of described many input single output high-frequency inverter circuits is equivalent to the single output of a single input high-frequency inverter circuit, and described output high-frequency isolation energy storage transformation current rectifying and wave filtering circuit is by the high frequency storage transformer, hf rectifier, output filter capacitor cascade in regular turn constitutes.
2. single-isolation pressure increase and reduction type multi-input direct current converter according to claim 1 is characterized in that: the circuit topology of described single-isolation pressure increase and reduction type multi-input direct current converter is two-tube inverse-excitation type, the two-tube inverse-excitation type of paralleling and interleaving, paralleling and interleaving single tube reverse excitation circuit.
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