CN213547372U - Direct current converter topology circuit and inverter system - Google Patents
Direct current converter topology circuit and inverter system Download PDFInfo
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- CN213547372U CN213547372U CN202022629582.3U CN202022629582U CN213547372U CN 213547372 U CN213547372 U CN 213547372U CN 202022629582 U CN202022629582 U CN 202022629582U CN 213547372 U CN213547372 U CN 213547372U
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Abstract
The utility model discloses a DC converter topology circuit and an inverter system, the DC converter topology circuit comprises a working circuit connected with both ends of a photovoltaic array, and the 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. Compared with the prior art, the utility model discloses can still keep bus voltage stable when photovoltaic array input voltage is higher than direct current bus, and simple structure, low cost.
Description
Technical Field
The utility model relates to a photovoltaic power generation field, especially a direct current converter topology circuit and 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, it is an urgent technical problem in the art to design a dc converter topology circuit and an inverter system that can still keep the bus voltage stable when the input voltage of the photovoltaic array is high.
SUMMERY OF THE UTILITY MODEL
To prior art, when photovoltaic input voltage was greater than busbar voltage, photovoltaic array can charge rising busbar voltage for direct current bus-bar capacitance, probably caused the technical problem that the system is unstable or breaks down, the utility model provides a topological circuit of direct current converter and inverter system.
The technical scheme of the utility model is that, a DC converter topology circuit is provided, which comprises a working circuit connected with both ends of a photovoltaic array, wherein the 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 utility model also provides an inverter system, including photovoltaic array, with direct current converter, connection that photovoltaic array connects direct current converter's bidirectional converter and with the electric wire netting that bidirectional converter connects, still including connecting in direct current bus's direct current load and bus capacitance and compressor drive, with the motor that the compressor drive is connected, direct current converter adopts above-mentioned direct current converter topological circuit.
Compared with the prior art, the utility model discloses following beneficial effect has at least:
1. the DC converter topology circuit of the utility model 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 of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced 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 without inventive labor.
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 topology circuit diagram of a dc converter according to a first embodiment of the present invention;
fig. 5 is a topology circuit diagram of a dc converter according to a second embodiment of the present invention;
fig. 6 is a logic diagram of the control of the working mode of the dc converter according to the present invention;
fig. 7 is a topology diagram of the inverter system after the improvement of the present invention.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. 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 an embodiment of the invention, and not to imply that every embodiment of the invention must have the described 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 structure of the present invention will be described in detail below with reference to the accompanying drawings and examples.
The utility model provides a DC converter topology circuit, it is including the working circuit of connection at the photovoltaic array both ends, it has two kinds of working modes of Boost working mode and Buck working mode, when the input voltage of photovoltaic array is less than or equal to direct current bus voltage, the working circuit gets into the Bssot working mode, the input voltage of rising photovoltaic array, when the input voltage of photovoltaic array is greater than direct current bus voltage, the working circuit gets into the Buck working mode, reduces the input voltage of photovoltaic array.
Specifically, please refer to fig. 4, which illustrates a topology circuit diagram of a dc converter according to a first embodiment of the present invention, including a switch S1, a switch S2, a switch S3, an inductor L1, an inductor L2, a capacitor C1, a diode D0, a switch S4, and a diode D4 disposed on the switch 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.
Please refer to fig. 5, which 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.
Wherein, when switch tube S1 ends, switch tube S2, switch tube S3 switch on, and when switch tube S4 was in the high frequency on-off state, operating circuit got into Boost mode, its theory of operation with the utility model discloses first embodiment Boost mode is the same, does not do here and describe repeatedly.
When switch tube S1 is in the high frequency on-off state, switch tube S2, switch tube S3, switch tube S4 when ending, the working circuit gets into Buck mode, its theory of operation with the utility model discloses Buck mode is the same in the first embodiment, does not do here and describe repeatedly.
Wherein, the utility model discloses still include the detecting element among the direct current converter topology circuit, the detecting element is used for real-time detection photovoltaic array's operating voltage.
The utility model relates to a control method of 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, and a power grid connected to the bidirectional converter, and further includes 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 utility model discloses a switch and division light pipe realize control, simple structure, and low cost can make direct current converter still keep the bus voltage stable when photovoltaic array input voltage is higher than the direct current generating line. 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 exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (9)
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. 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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| Application Number | Priority Date | Filing Date | Title |
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| CN202022629582.3U CN213547372U (en) | 2020-11-13 | 2020-11-13 | Direct current converter topology circuit and inverter system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022629582.3U CN213547372U (en) | 2020-11-13 | 2020-11-13 | Direct current converter topology circuit and inverter system |
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| CN213547372U true CN213547372U (en) | 2021-06-25 |
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