CN112271925A - Direct current converter topology circuit, control method thereof and inverter system - Google Patents
Direct current converter topology circuit, control method thereof and inverter system Download PDFInfo
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- CN112271925A CN112271925A CN202011270674.5A CN202011270674A CN112271925A CN 112271925 A CN112271925 A CN 112271925A CN 202011270674 A CN202011270674 A CN 202011270674A CN 112271925 A CN112271925 A CN 112271925A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
- H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/1566—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators with means for compensating against rapid load changes, e.g. with auxiliary current source, with dual mode control or with inductance variation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a direct current converter topological circuit, a control method thereof and an inverter system, wherein the direct current converter topological circuit comprises working circuits connected to two ends of a photovoltaic array, and the working circuits have a Boost working mode and a Buck working mode; when the input voltage of the photovoltaic array is smaller than or equal to the direct-current bus voltage, the working circuit enters the Boost working mode and boosts the input voltage; when the input voltage of the photovoltaic array is larger than the voltage of the direct-current bus, the working circuit enters the Buck mode, and the input voltage is reduced. Compared with the prior art, the photovoltaic bus voltage stabilizing device can still keep the bus voltage stable when the photovoltaic array input voltage is higher than the direct current bus, and has the advantages of simple structure and low cost.
Description
Technical Field
The invention relates to the field of photovoltaic power generation, in particular to a direct-current converter topological circuit, a control method thereof and an inverter system.
Background
With the development of new energy technology, inverters are used as key power supply equipment and are increasingly applied to photovoltaic power generation engineering, fig. 1 is a common inverter system topology, and the inverter system topology is composed of a photovoltaic array, a DC/DC, a bus capacitor C1, a DC/AC and a power grid and can feed back photovoltaic power generation to the power grid or an alternating current load. However, since the photovoltaic module is susceptible to illumination, temperature, external shielding, and the like, the open-circuit voltage of the photovoltaic module fluctuates within a certain range. In order to achieve the maximum efficiency by using the photovoltaic power generation power, in combination with the P-V curve of the photovoltaic power generation, the Maximum Power Point Tracking (MPPT) is generally performed by using a DC/DC converter, and a general topology thereof is shown in fig. 2, and the topology belongs to a Boost circuit, and when the photovoltaic open-circuit voltage is lower than the DC bus voltage, the circuit only operates an inductor and a diode D1, and the loss is large.
The improved topology is shown in fig. 3, and the inductor L and the diode D1 can be bypassed, so that the loss of the DC/DC converter is reduced, and the DC/DC efficiency is improved.
In the two existing DC/DC converter schemes, when the photovoltaic input open-circuit voltage is greater than the DC bus voltage, the photovoltaic array is directly connected to the DC bus, and the DC bus capacitor is charged by the photovoltaic array, so that the photovoltaic DC bus voltage is increased synchronously. And in this state, the DC/DC cannot perform Maximum Power Point Tracking (MPPT) of the photovoltaic input. In a photovoltaic (pv) storage air conditioning system, a plurality of dc loads, energy storage devices or air conditioning devices are usually connected to a dc bus, and the dc bus voltage is required to be relatively stable, so that the system is unstable or fails due to excessive bus voltage fluctuation.
Therefore, how to design a dc converter topology circuit, a control method thereof, and an inverter system that can still keep the bus voltage stable when the input voltage of the photovoltaic array is high is an urgent technical problem in the industry.
Disclosure of Invention
The invention provides a direct current converter topology circuit, a control method thereof and an inverter system, and aims to solve the technical problem that in the prior art, when photovoltaic input voltage is greater than bus voltage, a photovoltaic array charges a direct current bus capacitor to increase the bus voltage, and the system is likely to be unstable or have faults.
The technical scheme of the invention is that a direct current converter topological circuit is provided, which comprises working circuits connected to two ends of a photovoltaic array, wherein each working circuit has a Boost working mode and a Buck working mode;
when the input voltage of the photovoltaic array is smaller than or equal to the direct-current bus voltage, the working circuit enters the Boost working mode and boosts the input voltage;
when the input voltage of the photovoltaic array is larger than the voltage of the direct-current bus, the working circuit enters the Buck mode, and the input voltage is reduced.
Further, the operating circuit includes: a switch S1, a switch S2, a switch S3, an inductor L1, an inductor L2, a capacitor C1, a diode D0, a switch tube S4 and a diode D4 arranged on the switch tube S4;
one end of the switch S1 is connected to the output end of the photovoltaic array, the other end of the switch S1 is connected to one end of a switch S3, the other end of the switch S3 is connected to the anode of a diode D0, the cathode of a diode D0 is connected to one end of a capacitor C1, and the other end of the capacitor C1 is connected to the input end of the photovoltaic array;
one end of a switch S2 is connected between a switch S1 and the output end of the photovoltaic array, the other end of a switch S2 is connected with one end of an inductor L1, the other end of the inductor L1 is connected between a switch S1 and a switch S2, one end of an inductor L2 is connected between the switch S1 and a switch S3, and the other end of the inductor L2 is connected between the negative electrode of a diode D0 and a capacitor C1;
the first terminal of the switch tube S4 is connected between the switch S1 and the switch S3, and the second terminal of the switch tube S4 is connected between the capacitor C1 and the input terminal of the photovoltaic array.
Further, when the switch S1 is opened, the switch S2 and the switch S3 are closed, and the switch tube S4 is in a high-frequency switching state, the operating circuit enters the Boost operating state.
Further, when the switch S1 is in a high-frequency switching state, the switch S2, the switch S3 are turned off, and the switch tube S4 is turned off, the operating circuit enters the Buck operating mode.
Further, the operating circuit includes: a switch tube S1, a switch tube S2, a switch tube S3, a switch tube S4, a diode D1 arranged on the switch tube S1, a diode D2 arranged on the switch tube S2, a diode D3 arranged on the switch tube S3, a diode D4 arranged on the switch tube S4, a diode D0, an inductor L1, an inductor L2 and a capacitor C1;
a first end of the switch tube S1 is connected to an output end of the photovoltaic array, a second end of the switch tube S1 is connected to a first end of a switch tube S3, a second end of the switch tube S3 is connected to an anode of a diode D0, a cathode of the diode D0 is connected to one end of a capacitor C1, and the other end of the capacitor C1 is connected to an input end of the photovoltaic array;
a first end of the switch tube S2 is connected between the first end of the switch tube S1 and the output end of the photovoltaic array, a second end of the switch tube S2 is connected to one end of the inductor L1, and the other end of the inductor L1 is connected between the second end of the switch tube S1 and the first end of the switch tube S3;
one end of the inductor L2 is connected between the second end of the switching tube S1 and the first end of the switching tube S3, and the other end is connected between the cathode of the diode D0 and the capacitor C1;
the first end of the switch tube S4 is connected between the second end of the switch tube S1 and the first end of the switch tube S3, and the other end is connected between the input end of the photovoltaic array and the capacitor C1.
Further, when the switching tube S1 is turned off, the switching tube S2 and the switching tube S3 are turned on, and the switching tube S4 is in a high-frequency switching state, the operating circuit enters the Boost operating mode.
Further, when the switch tube S1 is in a high-frequency switching state and the switch tube S2, the switch tube S3 and the switch tube S4 are turned off, the operating circuit enters the Buck operating mode.
Further, the photovoltaic power generation device further comprises a detection unit, wherein the detection unit is used for detecting the photovoltaic input voltage in real time.
The invention also provides a control method of the direct current converter topology circuit, which comprises the steps of detecting the input voltage of the photovoltaic array, comparing the input voltage with the direct current bus voltage, and if the input voltage is greater than or equal to the direct current bus voltage, enabling the direct current converter topology circuit to enter a Boost working mode;
and if the input voltage is less than the voltage of the direct-current bus, the direct-current converter topology circuit enters the Buck working mode.
The invention also provides an inverter system, which comprises a photovoltaic array, a direct current converter connected with the photovoltaic array, a bidirectional converter connected with the direct current converter, a power grid connected with the bidirectional converter, a direct current load and a bus capacitor connected with a direct current bus, a compressor drive and a motor connected with the compressor drive, wherein the direct current converter adopts the direct current converter topological circuit.
Compared with the prior art, the invention has at least the following beneficial effects:
1. the direct current converter topology circuit has simple structure and low cost;
2. the direct current converter can still keep the bus voltage stable when the photovoltaic array input voltage is higher than the direct current bus.
3. The photovoltaic input voltage is in a system bearable voltage range, the direct current converter can work in a step-up/step-down mode in a full voltage range, the photovoltaic input voltage is adjusted to carry out MPPT optimization, the photovoltaic input can be enabled to work at a maximum power point to the maximum extent, and the efficiency of the direct current converter is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a topology diagram of a prior art inverter system;
FIG. 2 is a prior art DC converter topology circuit diagram;
FIG. 3 is a circuit diagram of an improved DC converter topology of the prior art;
FIG. 4 is a circuit diagram of a DC converter topology according to a first embodiment of the present invention;
FIG. 5 is a circuit diagram of a DC converter topology according to a second embodiment of the present invention;
FIG. 6 is a logic diagram illustrating the control of the DC converter operating mode according to the present invention;
fig. 7 is a topology diagram of an inverter system according to the improvement of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Thus, a feature indicated in this specification will serve to explain one of the features of one embodiment of the invention, and does not imply that every embodiment of the invention must have the stated feature. Further, it should be noted that this specification describes many features. Although some features may be combined to show a possible system design, these features may also be used in other combinations not explicitly described. Thus, the combinations illustrated are not intended to be limiting unless otherwise specified.
The principles and construction of the present invention will be described in detail below with reference to the drawings and examples.
The invention provides a direct current converter topology circuit which comprises working circuits connected to two ends of a photovoltaic array, wherein the working circuits have a Boost working mode and a Buck working mode.
Specifically, please refer to fig. 4, which shows a topology circuit diagram of the dc converter according to the first embodiment of the present invention, which includes a switch S1, a switch S2, a switch S3, an inductor L1, an inductor L2, a capacitor C1, a diode D0, a switch tube S4, and a diode D4 disposed on the switch tube S4;
one end of a switch S1 is connected to the output end of the photovoltaic array, the other end of a switch S1 is connected to one end of a switch S3, the other end of the switch S3 is connected to the anode of a diode D0, the cathode of a diode D0 is connected to one end of a capacitor C1, and the other end of a capacitor C1 is connected to the input end of the photovoltaic array;
one end of a switch S2 is connected between a switch S1 and the output end of the photovoltaic array, the other end of a switch S2 is connected with one end of an inductor L1, the other end of the inductor L1 is connected between a switch S1 and a switch S2, one end of an inductor L2 is connected between the switch S1 and a switch S3, and the other end of the inductor L2 is connected between the negative electrode of a diode D0 and a capacitor C1;
the first terminal of the switch tube S4 is connected between the switch S1 and the switch S3, and the second terminal of the switch tube S4 is connected between the capacitor C1 and the input terminal of the photovoltaic array.
When the switch S1 is turned off, the switch S2 and the switch S3 are turned on, and the switching tube S4 is in a high-frequency switching state, the operating circuit enters a Boost operating mode, specifically, when the switching tube S4 is turned on, current flows out from the output end of the photovoltaic array and returns to the input end of the photovoltaic array through the switch S2, the inductor L1 and the switching tube S4, at this time, the photovoltaic array charges the inductor L1, when the switching tube S4 is turned off, current flows out from the output end of the photovoltaic array and returns to the input end of the photovoltaic array through the switch S2, the inductor L1, the switch S3, the diode D0 and the capacitor C1, at this time, the inductor L1 discharges, electric energy is transferred from the inductor L1 to the capacitor C1, and when the circuit is stable, the charging and discharging of the inductor L1 are balanced. Assuming that the voltage across the photovoltaic array is E, the on and off times of the switching tube S4 in one cycle are ton and toff, respectively, the output voltage Uo = E (ton + toff)/ton, and the Boost circuit is a voltage Boost circuit because the output voltage is higher than the input voltage. And the input voltage can change along with the output voltage in the photovoltaic array, namely the input voltage is increased.
When the switch S1 is in a high-frequency switching state, the switch S2 and the switch S3 are turned off, and the switching tube S4 is turned off, the operating band enters a Buck operating mode, specifically, when the switch S1 is turned on, current flows from the positive end of the photovoltaic array through the switch S1, the inductor L2 and the capacitor C1 to return to the negative end of the photovoltaic array, which is equivalent to a circuit that magnetizes the inductor L2 and stores energy in the inductor L2; when the switch S1 is turned off, the photovoltaic array and the inductor L2 are turned off, the inductor L2 releases magnetic energy, and current flows through the inductor L2, the capacitor C1 and the diode D4 to return to the inductor L2, which corresponds to energy transfer from the inductor L2 to the capacitor C1. When the circuit is stable, the magnetizing and the demagnetizing of the inductor L2 are balanced, assuming that the voltage across the photovoltaic array is E, the on and off times of the switching tube S4 in one cycle are ton and toff respectively, the output voltage Uo = E × ton/(ton + toff), and the Buck circuit is a voltage reduction circuit because the output voltage is lower than the input voltage. The input voltage is reduced because the input voltage in the photovoltaic array will follow the output voltage.
Fig. 5 is a circuit diagram of a dc converter topology according to a second embodiment of the present invention, the operating circuit includes: a switch tube S1, a switch tube S2, a switch tube S3, a switch tube S4, a diode D1 arranged on the switch tube S1, a diode D2 arranged on the switch tube S2, a diode D3 arranged on the switch tube S3, a diode D4 arranged on the switch tube S4, a diode D0, an inductor L1, an inductor L2 and a capacitor C1;
a first end of the switch tube S1 is connected to an output end of the photovoltaic array, a second end of the switch tube S1 is connected to a first end of the switch tube S3, a second end of the switch tube S3 is connected to an anode of the diode D0, a cathode of the diode D0 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is connected to an input end of the photovoltaic array;
a first end of the switching tube S2 is connected between the first end of the switching tube S1 and the output end of the photovoltaic array, a second end of the switching tube S2 is connected with one end of the inductor L1, and the other end of the inductor L1 is connected between the second end of the switching tube S1 and the first end of the switching tube S3;
one end of the inductor L2 is connected between the second end of the switching tube S1 and the first end of the switching tube S3, and the other end is connected between the cathode of the diode D0 and the capacitor C1;
the first end of the switch tube S4 is connected between the second end of the switch tube S1 and the first end of the switch tube S3, and the other end is connected between the input end of the photovoltaic array and the capacitor C1.
When the switching tube S1 is turned off, the switching tube S2 and the switching tube S3 are turned on, and the switching tube S4 is in a high-frequency switching state, the working circuit enters a Boost working mode, which has the same working principle as the Boost working mode in the first embodiment of the present invention and will not be described herein.
When the switch tube S1 is in the high-frequency switching state, and the switch tube S2, the switch tube S3, and the switch tube S4 are turned off, the working circuit enters the Buck working mode, which has the same working principle as the Buck working mode in the first embodiment of the present invention, and will not be described herein.
The direct current converter topology circuit further comprises a detection unit, and the detection unit is used for detecting the working voltage of the photovoltaic array in real time.
The present invention also provides a method for controlling a dc converter topology circuit, please refer to fig. 6, which includes:
detecting the input voltage of the photovoltaic array, comparing the input voltage with the voltage of a direct current bus, and if the input voltage is greater than or equal to the voltage of the direct current bus, enabling the direct current converter topology circuit to enter a Boost working mode;
and if the input voltage is less than the voltage of the direct-current bus, the direct-current converter topology circuit enters the Buck working mode.
Referring to fig. 7, the present invention further provides an inverter system, which includes a photovoltaic array, a dc converter connected to the photovoltaic array, a bidirectional converter connected to the dc converter, a power grid connected to the bidirectional converter, a dc load and a bus capacitor connected to a dc bus, a compressor driver, and a motor connected to the compressor driver, wherein the dc converter employs the above dc converter topology circuit.
Compared with the prior art, the control is realized through the switch and the switch tube, the structure is simple, the cost is low, and the direct current converter can still keep the bus voltage stable when the photovoltaic array input voltage is higher than the direct current bus. And the photovoltaic input voltage is in the range of the bearable voltage of the system, the direct current converter can work in a step-up/step-down mode in the range of the full voltage, the photovoltaic input voltage is regulated to carry out MPPT optimization, the photovoltaic input can be enabled to work at the maximum power point to the maximum extent, and the efficiency of the direct current converter is improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A direct current converter topological circuit comprises working circuits connected to two ends of a photovoltaic array, and is characterized in that the working circuits have a Boost working mode and a Buck working mode;
when the input voltage of the photovoltaic array is smaller than or equal to the direct-current bus voltage, the working circuit enters the Boost working mode and boosts the input voltage;
when the input voltage of the photovoltaic array is larger than the voltage of the direct-current bus, the working circuit enters the Buck mode, and the input voltage is reduced.
2. The dc converter topology circuit of claim 1, wherein the operating circuit comprises: a switch S1, a switch S2, a switch S3, an inductor L1, an inductor L2, a capacitor C1, a diode D0, a switch tube S4 and a diode D4 arranged on the switch tube S4;
one end of the switch S1 is connected to the output end of the photovoltaic array, the other end of the switch S1 is connected to one end of a switch S3, the other end of the switch S3 is connected to the anode of a diode D0, the cathode of a diode D0 is connected to one end of a capacitor C1, and the other end of the capacitor C1 is connected to the input end of the photovoltaic array;
one end of a switch S2 is connected between a switch S1 and the output end of the photovoltaic array, the other end of a switch S2 is connected with one end of an inductor L1, the other end of the inductor L1 is connected between a switch S1 and a switch S2, one end of an inductor L2 is connected between the switch S1 and a switch S3, and the other end of the inductor L2 is connected between the negative electrode of a diode D0 and a capacitor C1;
the first terminal of the switch tube S4 is connected between the switch S1 and the switch S3, and the second terminal of the switch tube S4 is connected between the capacitor C1 and the input terminal of the photovoltaic array.
3. The DC converter topology circuit of claim 2, wherein when the switch S1 is opened, the switch S2 and the switch S3 are closed, and the switch tube S4 is in a high frequency switching state, the operating circuit enters the Boost operating state.
4. The DC converter topology circuit of claim 2, wherein when the switch S1 is in a high frequency switching state, the switch S2, the switch S3 are open, and the switch tube S4 is closed, the operating circuit enters the Buck operating mode.
5. The dc converter topology circuit of claim 1, wherein the operating circuit comprises: a switch tube S1, a switch tube S2, a switch tube S3, a switch tube S4, a diode D1 arranged on the switch tube S1, a diode D2 arranged on the switch tube S2, a diode D3 arranged on the switch tube S3, a diode D4 arranged on the switch tube S4, a diode D0, an inductor L1, an inductor L2 and a capacitor C1;
a first end of the switch tube S1 is connected to an output end of the photovoltaic array, a second end of the switch tube S1 is connected to a first end of a switch tube S3, a second end of the switch tube S3 is connected to an anode of a diode D0, a cathode of the diode D0 is connected to one end of a capacitor C1, and the other end of the capacitor C1 is connected to an input end of the photovoltaic array;
a first end of the switch tube S2 is connected between the first end of the switch tube S1 and the output end of the photovoltaic array, a second end of the switch tube S2 is connected to one end of the inductor L1, and the other end of the inductor L1 is connected between the second end of the switch tube S1 and the first end of the switch tube S3;
one end of the inductor L2 is connected between the second end of the switching tube S1 and the first end of the switching tube S3, and the other end is connected between the cathode of the diode D0 and the capacitor C1;
the first end of the switch tube S4 is connected between the second end of the switch tube S1 and the first end of the switch tube S3, and the other end is connected between the input end of the photovoltaic array and the capacitor C1.
6. The DC converter topology circuit according to claim 5, wherein when the switch tube S1 is turned off, the switch tube S2 and the switch tube S3 are turned on, and the switch tube S4 is in a high frequency switching state, the operating circuit enters the Boost operating mode.
7. The DC converter topology circuit of claim 5, wherein when the switch tube S1 is in a high frequency switching state, and the switch tube S2, the switch tube S3 and the switch tube S4 are turned off, the operating circuit enters the Buck operating mode.
8. The dc converter topology circuit of claim 1, further comprising a detection unit for detecting the photovoltaic input voltage in real time.
9. A control method for a dc converter topology circuit using the dc converter topology circuit according to any one of claims 1 to 8, the control method comprising:
detecting the input voltage of the photovoltaic array, comparing the input voltage with the voltage of a direct current bus, and if the input voltage is greater than or equal to the voltage of the direct current bus, enabling the direct current converter topology circuit to enter a Boost working mode;
and if the input voltage is less than the voltage of the direct-current bus, the direct-current converter topology circuit enters the Buck working mode.
10. An inverter system comprising a photovoltaic array, a dc converter connected to said photovoltaic array, a bi-directional converter connected to said dc converter, and a grid connected to said bi-directional converter, further comprising a dc load and a bus capacitor connected to a dc bus, and a compressor drive, an electric machine connected to said compressor drive, wherein said dc converter employs a dc converter topology as claimed in any one of claims 1 to 8.
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| CN202011270674.5A CN112271925A (en) | 2020-11-13 | 2020-11-13 | Direct current converter topology circuit, control method thereof and inverter system |
| PCT/CN2021/105760 WO2022100123A1 (en) | 2020-11-13 | 2021-07-12 | Direct-current converter topology circuit and control method therefor, and inverter system |
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| CN114325306A (en) * | 2021-12-03 | 2022-04-12 | 广东友电新能源科技有限公司 | Method and device for detecting connectivity of inverter system, electronic equipment and medium |
| WO2022100123A1 (en) * | 2020-11-13 | 2022-05-19 | 珠海格力电器股份有限公司 | Direct-current converter topology circuit and control method therefor, and inverter system |
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| CN116632890B (en) * | 2023-05-24 | 2023-10-27 | 燕山大学 | Isolated converter topology structure and capacity sharing and fault tolerance method thereof |
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| CN101938136A (en) * | 2009-07-01 | 2011-01-05 | 昆明普罗米能源科技有限公司 | Photovoltaic component DC grid-connection controller |
| CN203813656U (en) * | 2013-11-27 | 2014-09-03 | 苏州贝克微电子有限公司 | Switching voltage regulator |
| CN107560039B (en) * | 2017-08-31 | 2023-11-14 | 珠海格力电器股份有限公司 | Photovoltaic air conditioner adapter and photovoltaic air conditioning system |
| CN108322046B (en) * | 2018-03-05 | 2020-03-24 | 阳光电源股份有限公司 | Boost-buck power optimizer and control method and control device thereof |
| CN112271925A (en) * | 2020-11-13 | 2021-01-26 | 珠海格力电器股份有限公司 | Direct current converter topology circuit, control method thereof and inverter system |
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| WO2022100123A1 (en) * | 2020-11-13 | 2022-05-19 | 珠海格力电器股份有限公司 | Direct-current converter topology circuit and control method therefor, and inverter system |
| CN114325306A (en) * | 2021-12-03 | 2022-04-12 | 广东友电新能源科技有限公司 | Method and device for detecting connectivity of inverter system, electronic equipment and medium |
| CN114325306B (en) * | 2021-12-03 | 2024-03-22 | 深圳科士达科技股份有限公司 | Inversion system connectivity detection method and device, electronic equipment and medium |
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