CN216625586U - Wide-range input non-isolated three-port DC-DC converter - Google Patents
Wide-range input non-isolated three-port DC-DC converter Download PDFInfo
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- CN216625586U CN216625586U CN202122159990.1U CN202122159990U CN216625586U CN 216625586 U CN216625586 U CN 216625586U CN 202122159990 U CN202122159990 U CN 202122159990U CN 216625586 U CN216625586 U CN 216625586U
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Abstract
The utility model relates to a wide-range input non-isolated three-port DC-DC converter, which is characterized in that: the photovoltaic grid-connected inverter comprises a four-switch Buck-Boost converter, a photovoltaic cell, a storage battery, three ports of a direct-current bus and a Boost converter, wherein a four-switch Buck-Boost circuit is used for connecting the photovoltaic cell, the storage battery and a load, and the Boost circuit is used for connecting the photovoltaic cell and the load; the positive electrode of a photovoltaic cell in the four-switch Buck-Boost circuit is connected with the anode of a diode VD1, the diode VD1 is connected with a diode VD2, the diode VD2 is connected with a switch tube S1, and three branches are led out from the source electrode of the switch tube S1.
Description
Technical Field
The utility model relates to the technical field of power electronic converters, in particular to a wide-range input non-isolated three-port DC-DC converter.
Background
With the increasing exhaustion of fossil energy, renewable energy is more and more valued by people. However, renewable energy sources have the characteristics of randomness, intermittency and slow dynamic response, and in order to realize stable energy supply and quickly respond to the demand of load energy, an energy storage device is required to be added. The traditional energy management scheme of the renewable energy port, the energy storage port and the load port is to use a plurality of power electronic conversion devices, but the method has low component utilization rate, high volume cost and complex control.
A three-port converter is an integrated converter that can connect three ports simultaneously. It has the advantages of compact structure, small volume cost, convenient centralized control and the like. The method has great application potential in medium and small power renewable energy systems with cost and volume being emphasized. Various three-port converter topologies have been proposed in many documents, but these topologies generally have difficulties with significant size constraints and narrow application ranges for the inter-port voltages. For example, [1] Tomas-Manez, k., et al, "High Efficiency Non-isolated Three Port DC-DC Converter for PV-Battery Systems," ECCE-Aisa 2016 IEEE,2016. the Non-isolated Three-Port Converter described can only be applied to scenarios where the photovoltaic cell voltage is greater than the Battery voltage, [2] Zhang, b., et al, "Novel topology and control of a Non-isolated Three Port DC-DC Converter for PV-Battery power system," 201720 th International Conference Electrical Machines and Systems (ICEMS) IEEE, 2017. the Non-isolated Three-Port Converter described can only be applied to scenarios where the photovoltaic cell voltage is less than the Battery voltage.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects of the prior art, the utility model aims to solve the technical problem of providing a wide-range input non-isolated three-port DC-DC converter which is three-port and has the characteristics of high power density, wide input range, high reliability and the like.
In order to achieve the purpose, the technical scheme of the utility model is as follows: a wide-range input non-isolated three-port DC-DC converter is composed of two parts: four-switch Buck-Boost converter, Boost converter and four-switchThe Buck-Boost converter and the Boost converter are respectively provided with three ports of a photovoltaic cell, a storage battery and a direct current bus, the four-switch Buck-Boost circuit is used for connecting the photovoltaic cell and the storage battery as well as the storage battery and a load, and the Boost circuit is used for connecting the photovoltaic cell and the load; the positive electrode of a photovoltaic cell in the four-switch Buck-Boost circuit is connected with the anode of a diode VD1, and the series circuit of the diode VD2 and a switching tube S1 is connected with the cathode of a diode VD 1. Three branches are led out from a source electrode of the switching tube S1, one branch is connected to one end of a series circuit of the switching tube S2 and the VD3, the other branch is connected to a drain electrode of the switching tube S3, the last branch is connected to one end of an inductor L2, the other end of the inductor L2 is connected to the drain electrode of the switching tube S4 on one hand and the drain electrode of the switching tube S5 on the other hand, the source electrode of the switching tube S5 is connected to one end of a capacitor Cb and the anode of a storage battery Bat, and one end of a parallel circuit of an output capacitor C0 and a load R is connected to the other end of the series circuit of the switching tube S2 and a diode VD 3; in the Boost circuit, the anode of a photovoltaic cell is connected with the anode of a diode VD1, the cathode of VD1 is connected with one end of an inductor L1, the other end of the inductor L1 is connected with the drain of a switching tube S6 on the one hand and the anode of a diode VD4 on the other hand, and the cathode of the diode VD4 is connected with an output filter capacitor C0And the other end of the load R is connected to the other ends of the output capacitor C0 and the capacitor Cb, the cathodes of the storage battery and the photovoltaic cell, and the sources of the switching tube S3, the switching tube S4 and the switching tube S6.
And the port of the photovoltaic cell is connected with the port of the storage battery through a four-switch Buck-Boost. The photovoltaic cell voltage is higher than the storage battery voltage, and the photovoltaic cell voltage is lower than the storage battery voltage, so that the work can be realized, and the power density and the reliability are improved.
The utility model has the beneficial effects that: the photovoltaic cell port and the storage battery port are connected through the four-switch Buck-Boost, so that the photovoltaic cell port and the storage battery port can be applied to a scene that the voltage of the photovoltaic cell is greater than the voltage of the storage battery and can also be applied to a scene that the voltage of the photovoltaic cell is less than the voltage of the storage battery.
And the port of the photovoltaic cell is connected with the port of the storage battery through a four-switch Buck-Boost. The photovoltaic cell voltage is higher than the storage battery voltage, and the photovoltaic cell voltage is lower than the storage battery voltage, so that the work can be realized, and the power density and the reliability are improved.
The power of the photovoltaic cell, the power of the storage battery and the power of the load are respectively controlled by different switching tubes such as the switching tubes S1-S4, the voltage and the power of the ports can be controlled by adjusting the duty ratio of the switching tubes, single-stage power conversion is carried out between any two ports, and centralized control can be achieved.
Drawings
FIG. 1 is a circuit diagram of the overall architecture of a wide range input non-isolated three port DC-DC converter of the present invention;
fig. 2 is an equivalent circuit diagram of the wide-range input non-isolated three-port DC-DC converter of the present invention operating with photovoltaic cells alone supplying power to a load.
FIG. 3 is a waveform diagram illustrating the operation of the photovoltaic cell of the present invention to power a load R alone;
fig. 4 is an equivalent circuit diagram of the wide-range input non-isolated three-port DC-DC converter of the present invention operating with a battery alone to supply power to a load.
FIG. 5 is a waveform diagram illustrating the operation of the present invention in which the storage battery supplies power to the load R alone;
fig. 6 is an equivalent circuit diagram of a wide range input non-isolated three-port DC-DC converter of the present invention operating with both photovoltaic cells and storage batteries supplying power to a load.
Fig. 7 is an equivalent circuit diagram of a wide range input non-isolated three-port DC-DC converter of the present invention operating in a photovoltaic cell while supplying power to a battery and a load.
Detailed Description
Example 1
The circuit diagram of the whole structure of the wide-range input non-isolated three-port DC-DC converter is shown in figure 1, the converter is provided with three ports of a photovoltaic cell, a storage battery and a direct current bus, and consists of two parts: the four-switch Buck-Boost circuit is used for connecting the photovoltaic cell, the storage battery and the load, and the Boost circuit is used for connecting the photovoltaic cell and the load; photovoltaic cell in four-switch Buck-Boost circuitIs connected to the anode of the diode VD1, and the series circuit of the diode VD2 and the switching tube S1 is connected to the cathode of the diode VD 1. Three branches are led out from a source electrode of the switching tube S1, one branch is connected to one end of a series circuit of the switching tube S2 and the VD3, the other branch is connected to a drain electrode of the switching tube S3, the last branch is connected to one end of an inductor L2, the other end of the inductor L2 is connected to the drain electrode of the switching tube S4 on one hand and the drain electrode of the switching tube S5 on the other hand, the source electrode of the switching tube S5 is connected to one end of a capacitor Cb and the anode of a storage battery Bat, and one end of a parallel circuit of an output capacitor C0 and a load R is connected to the other end of the series circuit of the switching tube S2 and a diode VD 3; in the Boost circuit, the anode of a photovoltaic cell is connected with the anode of a diode VD1, the cathode of VD1 is connected with one end of an inductor L1, the other end of the inductor L1 is connected with the drain of a switching tube S6 on the one hand and the anode of a diode VD4 on the other hand, and the cathode of the diode VD4 is connected with an output filter capacitor C0And the other end of the load R is connected to the other ends of the output capacitor C0 and the capacitor Cb, the cathodes of the storage battery and the photovoltaic cell, and the sources of the switching tube S3, the switching tube S4 and the switching tube S6.
When the wide-range input non-isolated three-port DC-DC converter works in a working mode that the photovoltaic cell supplies power to the load independently, only the switch tube S6 works at the moment, and the rest switch tubes are kept off. The equivalent circuit diagram is shown in fig. 2, and the working waveform diagram is shown in fig. 3. When the switching tube S6 is turned on, the photovoltaic cell charges the inductor L1, and the inductor current iL1 rises linearly; the switching tube S6 is turned off, the photovoltaic cell and the inductor L1 simultaneously supply power to the load, and the inductor current iL1 decreases linearly.
When the wide-range input non-isolated three-port DC-DC converter works in a mode that the storage battery supplies power to the load alone, the switching tubes S1, S4 and S6 are switched off, S5 is always switched on, and S3 and S2 are switched on complementarily. The equivalent circuit diagram is shown in fig. 4, and the working waveform diagram is shown in fig. 5.
When the switching tube S3 is turned on and the switching tube S2 is turned off, the photovoltaic cell charges the inductor L2, the inductor current iL2 rises linearly, and when the switching tube S2 is turned on and the switching tube S3 is turned off, the storage battery and the inductor L2 supply power to the load R at the same time, and the inductor current iL2 falls linearly.
When the wide-range input non-isolated three-port converter works in a mode that the photovoltaic cell and the storage battery supply power to the load at the same time, an equivalent circuit is shown in figure 6. When the photovoltaic cell voltage is greater than the battery voltage: at this time, the switching tube S1 is kept off, DS6< DS3, DS3 and DS2 are complementarily turned on, and S5 is always turned on, the operating waveforms are as shown in fig. 7, when the switching tube S3 and the switching tube S5 are turned on, and the switching tube S6 and the switching tube S2 are turned off, the photovoltaic cell and the inductor L1 simultaneously supply power to the load, and the inductor current iL1 linearly decreases; the storage battery charges the inductor L2, the inductive current iL2 linearly rises, when the switching tube S3 and the switching tube S5 are continuously conducted, the switching tube S6 is conducted, and the switching tube S2 is turned off, the photovoltaic battery charges the inductor L1, and the inductive current iL1 linearly rises; the storage battery continues to charge the inductor L2, the inductor current iL2 linearly rises, when the switching tube S2 and the switching tube S5 are switched on and the switching tube S3 and the switching tube S6 are switched off, the photovoltaic cell and the inductor L1 jointly supply power to the load, and the inductor current iL1 linearly drops; the storage battery and the inductor L2 jointly supply power to the load, and the inductor current iL2 linearly decreases.
When the photovoltaic cell voltage is less than the battery voltage: at the moment, the switching tube S1 and the switching tube S4 do not work, DS6> DS2, when the switching tube S6 is conducted and the switching tube S2 and the switching tube S5 are turned off, the storage battery does not participate in the work, the photovoltaic cell PV charges the inductor L1, the inductor current iL1 linearly rises, when the switching tube S2, the switching tube S5 and the switching tube S6 are all conducted, the photovoltaic cell continues to charge the inductor L1, the inductor current iL1 continues to linearly rise, the storage battery charges the inductor L2, and the inductor current iL2 linearly rises;
when the switching tubes S2 and S5 continue to be turned on and the switching tube S6 is turned off, the photovoltaic cell and the inductor L1 and the storage battery and the inductor L2 charge the load at the same time, and the inductor current iL1 and the inductor current iL2 both decrease linearly.
The wide-range input non-isolated three-port converter operates when the photovoltaic cell is simultaneously supplying power to the battery and the load, and when the voltage of the photovoltaic cell is greater than the voltage of the battery: at this time, the switching tube S2 and the switching tube S4 are kept off, the switching tube S5 is always on, the body diode of the switching tube S3 is used as a freewheeling channel of the inductor L2, S1 and S6 are alternately on, when the switching tube S1 and the switching tube S5 are on and the switch S6 is off, the photovoltaic cell charges the inductor L2 and the storage battery, and the inductor current iL2 linearly rises; meanwhile, the photovoltaic cell and the inductor L1 jointly supply power to the load R, and the inductor current iL1 linearly decreases. When the switch tube S1 and the switch tube S5 are continuously conducted and the switch S6 is conducted, the photovoltaic cell continues to charge the inductor L2 and the storage battery, and the inductor current iL2 linearly rises; and meanwhile, the photovoltaic cell charges an inductor L1, and the inductor current iL1 rises linearly. When the switch tube S1 and the switch tube S6 are turned off and the switch S5 is turned on, the body diode of the switch tube S3 serves as a freewheeling channel of the inductor L2, at this time, the inductor L2 freewheels through the body diode of the switch tube S3 to continue charging the battery, and the inductor current iL2 decreases linearly; meanwhile, the photovoltaic cell and the inductor L1 jointly supply power to the load R, and the inductor current iL1 decreases linearly.
When the photovoltaic cell voltage is less than the battery voltage: at the moment, the switch tube S2 and the switch tube S3 do not work, DS6> DS4, and the switch tube S1 is always conducted, and when the switch tube S1, the switch tube S4 and the switch tube S6 are conducted, the photovoltaic cell linearly rises to the inductor L1, the inductor L2, the inductor current iL1 and the inductor current iL 2. When the switching tube S5 and the switching tube S6 are turned on and the switching tube S4 is turned off, the photovoltaic cell continues to charge the inductor L1, the inductor current iL1 decreases linearly, and simultaneously the photovoltaic cell and the inductor L2 charge the storage battery together, and the inductor current iL2 decreases linearly, when the switching tube S1 and the switching tube S5 are turned on and the switching tube S4 and the switching tube S6 are turned off, the photovoltaic cell and the inductor L1 supply power to the load together, the inductor current iL1 decreases linearly, simultaneously the photovoltaic cell and the inductor L2 continue to charge the storage battery together, and the inductor current iL2 continues to decrease linearly.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the object of the present invention.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. While the utility model has been described with respect to the above embodiments, it will be understood by those skilled in the art that the utility model is not limited to the above embodiments, which are described in the specification and illustrated only to illustrate the principles of the utility model, but that various changes and modifications may be made without departing from the spirit and scope of the utility model as defined by the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (3)
1. A wide-range input non-isolated three-port DC-DC converter, characterized by: the four-switch Buck-Boost circuit is characterized by comprising a four-switch Buck-Boost converter and a Boost converter, wherein the four-switch Buck-Boost converter and the Boost converter are respectively formed by connecting three ports of a photovoltaic cell, a storage battery and a direct-current bus, the four-switch Buck-Boost circuit is formed by connecting the photovoltaic cell and the storage battery as well as the storage battery and a load, and the Boost circuit is formed by connecting the photovoltaic cell and the load; the positive electrode of a photovoltaic cell in the four-switch Buck-Boost circuit is connected with the anode of a diode VD1, the diode VD1 is connected with a diode VD2, the diode VD2 is connected with a switch tube S1, three branches are led out from the source electrode of the switch tube S1, one branch is connected with one end of a series circuit of the switch tube S2 and the VD3, the other branch is connected with the drain electrode of the switch tube S3, the last branch is connected with one end of an inductor L2, the other end of the inductor L2 is respectively connected with the drain electrode of a switch tube S4 and the drain electrode of a switch tube S5, the source electrode of the switch tube S5 is connected with one end of a capacitor Cb and the positive electrode of a storage battery Bat, and one end of a parallel circuit of an output capacitor C0 and a load R is connected with the other end of the series circuit of the switch tube S2 and the diode VD 3; in the Boost circuit, the anode of a photovoltaic cell is connected with the anode of a diode VD1, the cathode of VD1 is connected with one end of an inductor L1, the other end of the inductor L1 is connected with the drain of a switching tube S6 on the one hand and the anode of a diode VD4 on the other hand, and the cathode of the diode VD4 is connected with an output filter capacitor C0And the other end of the load R is connected to the other ends of the output capacitor C0 and the capacitor Cb, the cathodes of the storage battery and the photovoltaic cell, and the sources of the switching tube S3, the switching tube S4 and the switching tube S6.
2. A wide range input non-isolated three-port DC-DC converter according to claim 1, wherein: and the port of the photovoltaic cell is connected with the port of the storage battery through a four-switch Buck-Boost.
3. A wide range input non-isolated three-port DC-DC converter according to claim 1, wherein: the series circuit of the diode VD2 and the switching tube S1 is connected to the cathode of the diode VD 1.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115347788A (en) * | 2022-10-14 | 2022-11-15 | 四川大学 | Non-isolated three-port converter and control method and control circuit thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115347788A (en) * | 2022-10-14 | 2022-11-15 | 四川大学 | Non-isolated three-port converter and control method and control circuit thereof |
| CN115347788B (en) * | 2022-10-14 | 2023-02-24 | 四川大学 | Non-isolated three-port converter and control method and control circuit thereof |
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