CN103326562A - Novel wind and light complementary double-input SEPIC DC-DC converter - Google Patents

Novel wind and light complementary double-input SEPIC DC-DC converter Download PDF

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CN103326562A
CN103326562A CN2013102377169A CN201310237716A CN103326562A CN 103326562 A CN103326562 A CN 103326562A CN 2013102377169 A CN2013102377169 A CN 2013102377169A CN 201310237716 A CN201310237716 A CN 201310237716A CN 103326562 A CN103326562 A CN 103326562A
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electric capacity
voltage
energy storage
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inductance
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廖志凌
施卫东
徐艳杰
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Jiangsu University
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Abstract

The invention discloses a novel wind and light complementary double-input SEPIC DC-DC converter which comprises a direct current input source Vin1, a direct current input source Vin2, a switching tube Q1, a switching tube Q2, an energy storage inductor L1, an energy storage inductor L2, an energy storage inductor L3, a fly-wheel diode D1, a fly-wheel diode D2, a middle energy storage capacitor Cb1, a middle energy storage capacitor Cb2, an output voltage distributing capacitor Cf1, an output voltage distributing capacitor Cf2 and a load resistor RLd. The Q1 and the Q2 can be conducted at the same time, and can also work with a certain angle between the Q1 and the Q2. The capacity of the output voltage distributing capacitor Cf1 and the capacity of the output voltage distributing capacitor Cf2 are large and are equal. The features, the amplitudes and the characters of the input source Vin1 and the input source Vin2 can be the same and can also not be the same. The double-input SEPIC DC-DC converter can work in a single-input state and can also work in a double-input state, and therefore the stability and the flexibility of a distributed power generation system can be improved. In addition, compared with a distributed power generation system which is provided with two single-input direct converters, the double-input SEPIC DC-DC converter has the advantages of being simple in structure, small in size and low in cost.

Description

A kind of novel wind-solar complementary dual input SEPIC DC-DC converter
Technical field
The present invention relates to a kind of novel wind-solar complementary dual input SEPIC DC-DC converter, belong to the electronic power converter technical field.
Background technology
Along with the development of economic society, energy crisis and environmental pollution that a large amount of consumption of fossil energy bring are day by day serious, seek active and effective counter-measure and solve energy crisis and problem of environmental pollution, have become one of focus of very paying close attention to both at home and abroad.And the regenerative resources such as solar energy, wind energy have reliably, the characteristics of cleanliness without any pollution, energy abundance, therefore become the preferably mode of the energy of replenishing.At present, use more renewable energy power generation form photovoltaic generation, wind power generation, fuel cell-powered, hydroelectric power generation etc. are arranged, but all exist supply of electric power unstable, discontinuous, with shortcomings such as weather conditions variations, therefore need to adopt various energy resources to unite the distributed power supply system of power supply.
Two input sources are arranged in the present distributed wind-photovoltaic complementary power supply system, and the voltage of every kind of input source is also unstable, so need the DC-DC converter to regulate.Traditional distributed wind-photovoltaic complementary power supply system is to use two single input DC-DC converters, the electricity that respectively wind energy and solar energy is sent becomes direct current, be connected in parallel on the public dc bus, supply with DC load, but this electric power system ubiquity structure is complicated, and the higher shortcoming of cost.In order to simplify circuit structure, reduce system bulk, to reduce system cost, can replace two single input DC-DC converters with a dual input DC-DC converter.In recent years, some Chinese scholars have also proposed some dual input DC-DC transformation topology structures, but that ubiquity voltage gain is low, and large not or two input sources of range of regulation are the shortcoming of powering load simultaneously.
Summary of the invention
The problems referred to above for DC-DC converter in the prior art exists the invention provides a kind of novel wind-solar complementary dual input SEPIC DC-DC converter, and it is deduced by traditional SEPIC three-level DC-DC converter and derives.
Technical scheme of the present invention is:
A kind of novel wind-solar complementary dual input SEPIC DC-DC converter comprises two direct current input sources V In1, V In2, two switching tubes Q 1, Q 2, three energy storage inductors L 1, L 2, L 3, two fly-wheel diodes D 1, D 2, two intermediate energy storage electric capacity C B1, C B2, two output dividing potential drop electric capacity C F1, C F2, a load resistance R LdDescribed direct current input source V In1With V In2Be connected in series inductance L 1An end with V In1Positive pole link to each other inductance L 1The other end and electric capacity C B1Positive pole link to each other switching tube Q 1Drain electrode and electric capacity C B1Positive pole link to each other switching tube Q 1Source electrode with V In1Negative pole link to each other diode D 1Anode and electric capacity C B1Negative pole link to each other diode D 1Negative electrode and output dividing potential drop electric capacity C F1Positive pole link to each other electric capacity C F1Negative pole with V In1Negative pole and C F2Positive pole link to each other inductance L 2An end with V In2Negative pole link to each other inductance L 2The other end and electric capacity C B2Negative pole, switching tube Q 2Source electrode link to each other switching tube Q 2Drain electrode with Q 1Source electrode link to each other electric capacity C B2Negative pole and switching tube Q 2Source electrode link to each other diode D 2Negative electrode and electric capacity C B2Positive pole link to each other diode D 2Anode and output dividing potential drop electric capacity C F2Negative pole link to each other electric capacity C F2Positive pole and electric capacity C F1Negative pole link to each other inductance L 3An end and electric capacity C B1Negative pole link to each other inductance L 3The other end and electric capacity C B2Positive pole link to each other 2 output dividing potential drop electric capacity C F1With C F2Be parallel to load resistance after being connected in series R LdTwo ends, load resistance R LdOne end and electric capacity C F1Positive pole link to each other, R LdThe other end and electric capacity C F2Negative pole link to each other.
Further, described two output dividing potential drop electric capacity C F1With C F2Equate.
Further, described two direct current input sources V In1, V In2Character, amplitude and characteristic identical or not identical, the described not identical situation that comprises that difference is very large.
Further, described novel wind-solar complementary dual input SEPIC DC-DC converter comprises following operation mode:
(1) Q 1With Q 2Simultaneously conducting: D 1With D 2Cut-off, C B1And C B2Discharge, C F1And C F2Discharge, D 1With D 2The voltage stress of bearing be ( V Cb1+ V Cb2+ V o)/2, wherein, V oBe output voltage, load is powered by two output filter capacitors, input voltage V In1Be added in energy storage inductor L 1Upper, V In2Be added in the intermediate energy storage inductance L 2On, two capacitances in series voltages V Cb1+ V Cb2Be added in energy storage inductor L 3On, inductance L 3Electric current increases;
(2) Q 1Conducting, Q 2Turn-off: D 1Cut-off, D 2Conducting, C B1Discharge, C B2Charging, C F1Discharge, C F2Charging, Q 2Upper voltage stress is storage capacitor C B2With output capacitance C F2On the voltage sum, D 1Upper voltage stress is storage capacitor C B1With output capacitance C F1On the voltage sum, the intermediate energy storage inductance L 3On voltage be storage capacitor C B1Voltage V Cb1With output capacitance C F2On voltage V Cf2Poor;
(3) Q 1Turn-off, Q 2Conducting: D 2Cut-off, D 1Conducting, C B1Charging, C B2Discharge, C F1Charging, C F2Discharge, Q 1Upper voltage stress is storage capacitor C B1With output capacitance C F1On the voltage sum, D 2Upper voltage stress is storage capacitor C B2With output capacitance C F2On the voltage sum.The intermediate energy storage inductance L 3On voltage be storage capacitor C B2Voltage V Cb1With output capacitance C F1On voltage V Cf1Poor;
(4) Q 1With Q 2Turn-off simultaneously: D 1With D 2Conducting, C B1, C B2Charging, C F1, C F2Charging, energy storage inductor L 3Electric current passes through diode D 1With D 2Afterflow, energy storage inductor L 3Upper two ends are voltage V o, inductance L 3Electric current descends;
(5) during the less or load reduction of intermediate energy storage inductance value: inductive current will be zero, and load is powered by output filter capacitor.
Pass between output voltage of the present invention and two input voltages is:
Figure 2013102377169100002DEST_PATH_IMAGE001
The invention has the beneficial effects as follows:
The present invention allows solar energy and two kinds of energy inputs of wind energy, the character of input source, amplitude and characteristic can be identical, also can difference very large, two kinds of input sources can power to the load respectively or simultaneously, wide input voltage range, voltage gain are large, therefore improved Systems balanth and flexibility, realized the comprehensive utilization of the energy, and have advantages of simple in structure, volume is little, reduce system cost.
Description of drawings
Fig. 1 is the topology theory figure of wind light mutual complementing dual input SEPIC DC-DC converter circuit of the present invention;
Fig. 2 is the equivalent electric circuit of wind light mutual complementing dual input SEPIC DC-DC converter of the present invention under the first operation mode;
Fig. 3 is the equivalent electric circuit of wind light mutual complementing dual input SEPIC DC-DC converter of the present invention under the second operation mode;
Fig. 4 is the equivalent electric circuit of wind light mutual complementing dual input SEPIC DC-DC converter of the present invention under the third operation mode;
Fig. 5 is the equivalent electric circuit of wind light mutual complementing dual input SEPIC DC-DC converter of the present invention under the 4th kind of operation mode;
Fig. 6 is the equivalent electric circuit of wind light mutual complementing dual input SEPIC DC-DC converter of the present invention under the 5th kind of operation mode.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
A kind of wind light mutual complementing dual input SEPIC DC-DC converter of the present invention, circuit topological structure such as Fig. 1 comprise: 2 direct current input sources V In1With V In2, 2 switching tubes Q 1With Q 2, 3 energy storage inductors L 1, L 2With L 3, 2 fly-wheel diodes D 1With D 2, 2 intermediate energy storage electric capacity C B1With C B2, 2 output dividing potential drop electric capacity C F1With C F2And 1 load resistance R LdWherein, 2 direct current input sources V In1With V In2Be connected in series inductance L 1An end with V In1Positive pole link to each other inductance L 1The other end and electric capacity C B1Positive pole link to each other switching tube Q 1Drain electrode and electric capacity C B1Positive pole link to each other switching tube Q 1Source electrode with V In1Negative pole link to each other diode D 1Anode and electric capacity C B1Negative pole link to each other diode D 1Negative electrode and output dividing potential drop electric capacity C F1Positive pole link to each other electric capacity C F1Negative pole with V In1Negative pole and C F2Positive pole link to each other inductance L 2An end with V In2Negative pole link to each other inductance L 2The other end and electric capacity C B2Negative pole, switching tube Q 2Source electrode link to each other switching tube Q 2Drain electrode with Q 1Source electrode link to each other electric capacity C B2Negative pole and switching tube Q 2Source electrode link to each other diode D 2Negative electrode and electric capacity C B2Positive pole link to each other diode D 2Anode and output dividing potential drop electric capacity C F2Negative pole link to each other electric capacity C F2Positive pole and electric capacity C F1Negative pole link to each other inductance L 3An end and electric capacity C B1Negative pole link to each other inductance L 3The other end and electric capacity C B2Positive pole link to each other 2 output dividing potential drop electric capacity C F1With C F2Be connected in series load resistance R LdOne end and electric capacity C F1Positive pole link to each other, R LdThe other end and electric capacity C F2Negative pole link to each other.
According to the operating state of Fig. 1 switching tube, there are following several operation modes in converter:
(1) operation mode I.As shown in Figure 2, Q 1With Q 2Simultaneously conducting, D 1With D 2Cut-off, C B1And C B2Discharge, C F1And C F2Discharge, D 1With D 2The voltage stress of bearing be ( V Cb1+ V Cb2+ V o)/2.Load is powered by two output filter capacitors.Input voltage V In1Be added in energy storage inductor L 1Upper, V In2Be added in the intermediate energy storage inductance L 2On, two capacitances in series voltages V Cb1+ V Cb2Be added in energy storage inductor L 3On, inductance L 3Electric current increases.
(2) operation mode II.As shown in Figure 3, Q 1Conducting, Q 2Turn-off, D 1Cut-off, D 2Conducting, C B1Discharge, C B2Charging, C F1Discharge, C F2Charging, Q 2Upper voltage stress is storage capacitor C B2With output capacitance C F2On the voltage sum, D 1Upper voltage stress is storage capacitor C B1With output capacitance C F1On the voltage sum.The intermediate energy storage inductance L 3On voltage be storage capacitor C B1Voltage V Cb1With output capacitance C F2On voltage V Cf2Poor.
(3) operation mode III.As shown in Figure 4, Q 1Turn-off, Q 2Conducting, D 2Cut-off, D 1Conducting, C B1Charging, C B2Discharge, C F1Charging, C F2Discharge, Q 1Upper voltage stress is storage capacitor C B1With output capacitance C F1On the voltage sum, D 2Upper voltage stress is storage capacitor C B2With output capacitance C F2On the voltage sum.The intermediate energy storage inductance L 3On voltage be storage capacitor C B2Voltage V Cb1With output capacitance C F1On voltage V Cf1Poor.
(4) operation mode IV.As shown in Figure 5, Q 1With Q 2Turn-off simultaneously, D 1With D 2Conducting, C B1, C B2Charging, C F1, C F2Charging, energy storage inductor L 3Electric current passes through diode D 1With D 2Afterflow, energy storage inductor L 3Upper two ends be voltage- V o, inductance L 3Electric current descends.
(5) operation mode V.As shown in Figure 6, when middle energy storage inductor amount during less or load reduction,, inductive current will be zero, load is powered by output filter capacitor.
With reference to the accompanying drawings 1, to inductance L 1, L 2, L 3Use respectively the weber equilibrium principle of inductance, can get
Figure 2013102377169100002DEST_PATH_IMAGE003
Figure 2013102377169100002DEST_PATH_IMAGE005
Figure DEST_PATH_IMAGE007
Various above further simplifying, can get
Figure DEST_PATH_IMAGE009
Figure DEST_PATH_IMAGE011
Again because
Figure 20275DEST_PATH_IMAGE014
The pass that therefore can obtain between output voltage and two input voltages is
Figure DEST_PATH_IMAGE015
The wind light mutual complementing dual input SEPIC DC-DC converter that the present invention proposes both can be operated in single input state, can be operated in the dual input state again, had improved stability and the flexibility of multiple new forms of energy distributed generation system, realized the comprehensive utilization of the energy.In addition, the present invention is with respect to for the distributed generation system of two single input DC-DC converters, have advantages of simple in structure, volume is little, cost is low.
The above only is preferred embodiment of the present invention, not in order to limit the present invention.All any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within protection scope of the present invention.

Claims (4)

1. a novel wind-solar complementary dual input SEPIC DC-DC converter is characterized in that: comprise two direct current input sources V In1, V In2, two switching tubes Q 1, Q 2, three energy storage inductors L 1, L 2, L 3, two fly-wheel diodes D 1, D 2, two intermediate energy storage electric capacity C B1, C B2, two output dividing potential drop electric capacity C F1, C F2, a load resistance R LdDescribed direct current input source V In1With V In2Be connected in series inductance L 1An end with V In1Positive pole link to each other inductance L 1The other end and electric capacity C B1Positive pole link to each other switching tube Q 1Drain electrode and electric capacity C B1Positive pole link to each other switching tube Q 1Source electrode with V In1Negative pole link to each other diode D 1Anode and electric capacity C B1Negative pole link to each other diode D 1Negative electrode and output dividing potential drop electric capacity C F1Positive pole link to each other electric capacity C F1Negative pole with V In1Negative pole and C F2Positive pole link to each other inductance L 2An end with V In2Negative pole link to each other inductance L 2The other end and electric capacity C B2Negative pole, switching tube Q 2Source electrode link to each other switching tube Q 2Drain electrode with Q 1Source electrode link to each other electric capacity C B2Negative pole and switching tube Q 2Source electrode link to each other diode D 2Negative electrode and electric capacity C B2Positive pole link to each other diode D 2Anode and output dividing potential drop electric capacity C F2Negative pole link to each other electric capacity C F2Positive pole and electric capacity C F1Negative pole link to each other inductance L 3An end and electric capacity C B1Negative pole link to each other inductance L 3The other end and electric capacity C B2Positive pole link to each other 2 output dividing potential drop electric capacity C F1With C F2Be parallel to load resistance after being connected in series R LdTwo ends, load resistance R LdOne end and electric capacity C F1Positive pole link to each other, R LdThe other end and electric capacity C F2Negative pole link to each other.
2. a kind of novel wind-solar complementary dual input SEPIC DC-DC converter according to claim 1 is characterized in that: described two output dividing potential drop electric capacity C F1With C F2Equate.
3. a kind of novel wind-solar complementary dual input SEPIC DC-DC converter according to claim 1 is characterized in that: described two direct current input sources V In1, V In2Character, amplitude and characteristic identical or not identical, the described not identical situation that comprises that difference is very large.
4. the described a kind of novel wind-solar complementary dual input SEPIC DC-DC converter of any one in 3 according to claim 1, it is characterized in that: described novel wind-solar complementary dual input SEPIC DC-DC converter comprises following operation mode:
(1) Q 1With Q 2Simultaneously conducting, D 1With D 2Cut-off, C B1And C B2Discharge, C F1And C F2Discharge, D 1With D 2The voltage stress of bearing be ( V Cb1+ V Cb2+ V o)/2, wherein, V oBe output voltage, load is powered by two output filter capacitors, input voltage V In1Be added in energy storage inductor L 1Upper, V In2Be added in the intermediate energy storage inductance L 2On, two capacitances in series voltages V Cb1+ V Cb2Be added in energy storage inductor L 3On, inductance L 3Electric current increases;
(2) Q 1Conducting, Q 2Turn-off, D 1Cut-off, D 2Conducting, C B1Discharge, C B2Charging, C F1Discharge, C F2Charging, Q 2Upper voltage stress is storage capacitor C B2With output capacitance C F2On the voltage sum, D 1Upper voltage stress is storage capacitor C B1With output capacitance C F1On the voltage sum, the intermediate energy storage inductance L 3On voltage be storage capacitor C B1Voltage V Cb1With output capacitance C F2On voltage V Cf2Poor;
(3) Q 1Turn-off, Q 2Conducting, D 2Cut-off, D 1Conducting, C B1Charging, C B2Discharge, C F1Charging, C F2Discharge, Q 1Upper voltage stress is storage capacitor C B1With output capacitance C F1On the voltage sum, D 2Upper voltage stress is storage capacitor C B2With output capacitance C F2On the voltage sum, the intermediate energy storage inductance L 3On voltage be storage capacitor C B2Voltage V Cb1With output capacitance C F1On voltage V Cf1Poor;
(4) Q 1With Q 2Turn-off simultaneously, D 1With D 2Conducting, C B1, C B2Charging, C F1, C F2Charging, energy storage inductor L 3Electric current passes through diode D 1With D 2Afterflow, energy storage inductor L 3Upper two ends are voltage V o, inductance L 3Electric current descends;
(5) during or load reduction less when middle energy storage inductor amount, inductive current will be zero, and load is powered by output filter capacitor, and the pass between output voltage and two input voltages is:
CN2013102377169A 2013-06-17 2013-06-17 Novel wind and light complementary double-input SEPIC DC-DC converter Pending CN103326562A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107453603A (en) * 2017-09-30 2017-12-08 湘潭大学 A kind of dual input Sepic converters
CN104868726B (en) * 2015-05-21 2018-11-09 天津大学 A kind of three level Boost DC converter of wide gain
CN115065239A (en) * 2022-05-06 2022-09-16 江南大学 Direct-current three-level Sepic converter suitable for photovoltaic power generation

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CN203301366U (en) * 2013-06-17 2013-11-20 江苏大学 A novel double-input SEPICDC-DC converter using wind and light complementation

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JPS6051458A (en) * 1983-08-31 1985-03-22 Toshiba Corp Dc/dc converter
CN102611304A (en) * 2012-02-20 2012-07-25 江苏大学 Novel dual-input Buck-Boost DC converter
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104868726B (en) * 2015-05-21 2018-11-09 天津大学 A kind of three level Boost DC converter of wide gain
CN107453603A (en) * 2017-09-30 2017-12-08 湘潭大学 A kind of dual input Sepic converters
CN107453603B (en) * 2017-09-30 2020-05-26 湘潭大学 Dual-input Sepic converter
CN115065239A (en) * 2022-05-06 2022-09-16 江南大学 Direct-current three-level Sepic converter suitable for photovoltaic power generation
CN115065239B (en) * 2022-05-06 2024-06-11 江南大学 DC three-level Sepic converter suitable for photovoltaic power generation

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Application publication date: 20130925