CN112701943A - Photovoltaic inverter based on Zeta converter - Google Patents
Photovoltaic inverter based on Zeta converter Download PDFInfo
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- CN112701943A CN112701943A CN202011596624.6A CN202011596624A CN112701943A CN 112701943 A CN112701943 A CN 112701943A CN 202011596624 A CN202011596624 A CN 202011596624A CN 112701943 A CN112701943 A CN 112701943A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 37
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- 230000005669 field effect Effects 0.000 claims abstract description 17
- 238000001514 detection method Methods 0.000 claims description 12
- 230000007246 mechanism Effects 0.000 claims description 5
- 238000004146 energy storage Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000003245 working effect Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
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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
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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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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- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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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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- Inverter Devices (AREA)
Abstract
The invention discloses a photovoltaic inverter based on a Zeta converter, which comprises a first filtering unit, a Zeta conversion unit, an inversion unit, a second filtering unit and a control unit, wherein the first filtering unit is connected with an external power supply unit, electric energy input by the external power supply unit is output to an external power grid after being processed by the first filtering unit, the Zeta conversion unit, the inversion unit and the second filtering unit in sequence, and the control unit is used for collecting working information of the photovoltaic inverter and controlling the work of the Zeta conversion unit and the inversion unit; the Zeta conversion unit comprises a field effect tube Q and a resonance part, and the grid electrode of the field effect tube Q is connected with the control unit; the resonance part comprises a first inductor L1, a second inductor L2, a second diode D2, a third diode D3 and a second capacitor C2 to form an LCL resonance circuit, energy is stored in parallel and discharged in series through the inductor and the capacitor to replace an energy storage inductor in the converter, the voltage gain of the converter can be improved, and harmonic interference can be greatly reduced.
Description
Technical Field
The invention relates to the technical field of photovoltaic inverters, in particular to a photovoltaic inverter based on a Zeta converter.
Background
The existing photovoltaic inverter has the problems of low conversion efficiency and low power density, and because the photovoltaic inverter needs to be matched with a high-frequency transformer for use, the required installation space is large in the installation process, so that the applicability of the photovoltaic inverter is reduced.
The conventional photovoltaic inverter generally comprises a BOOST circuit, but when the required output voltage is larger, the output gain curve of the BOOST circuit is approximately a vertical straight line, so that stable voltage cannot be provided for a later-stage inverter circuit, and the working stability of the photovoltaic inverter is reduced.
It is seen that improvements and enhancements to the prior art are needed.
Disclosure of Invention
In view of the above disadvantages of the prior art, an object of the present invention is to provide a photovoltaic inverter based on a Zeta converter, in which a resonant portion is an LCL resonant circuit, which can improve the voltage gain of the converter and greatly reduce harmonic interference.
In order to achieve the purpose, the invention adopts the following technical scheme:
a photovoltaic inverter based on a Zeta converter comprises a first filtering unit, a Zeta conversion unit, an inversion unit, a second filtering unit and a control unit, wherein the first filtering unit is connected with an external power supply unit, electric energy input by the external power supply unit is output to an external power grid after being processed by the first filtering unit, the Zeta conversion unit, the inversion unit and the second filtering unit in sequence, and the control unit is used for collecting working information of the photovoltaic inverter and controlling the work of the Zeta conversion unit and the inversion unit; the Zeta conversion unit comprises a field effect transistor Q and a resonance part, wherein the resonance part comprises a first inductor L1, a second inductor L2, a second diode D2, a third diode D3 and a second capacitor C2, the grid electrode of the field effect transistor Q is connected with the control unit, the drain electrode of the field effect transistor Q is connected with the first filtering unit, the source electrode of the field effect transistor Q is respectively connected with one end of the first inductor L1 and the anode of the third diode D3, the other end of the first inductor L1 is respectively connected with the anode of the second diode D2 and one end of the second capacitor C2, the cathode electrode of the third diode D3 is respectively connected with one end of the second inductor L2 and the other end of the second capacitor C2, and the cathode electrode of the second diode D2 and the other end of the second inductor L2 are grounded.
In the photovoltaic inverter based on the Zeta converter, the control unit comprises a first control part and a second control part which are electrically connected, and the first control part is used for collecting the working information of the photovoltaic inverter and controlling and adjusting the working states of the Zeta conversion unit and the inversion unit; the second control part is used for transmitting the operation information of the photovoltaic inverter collected by the first control part to an external control mechanism.
In the photovoltaic inverter based on the Zeta converter, the first control part comprises a first control chip U1, and a driving part and an information feedback part which are respectively and electrically connected with a first control chip U1, and the first control chip U1 is respectively connected with the Zeta conversion unit and the inversion unit through the driving part; the information feedback part is used for collecting the working information of the photovoltaic inverter.
In the photovoltaic inverter based on the Zeta converter, the driving part comprises a first driving circuit and a second driving circuit, the first control chip U1 is connected with the Zeta conversion unit through the first driving circuit, and the first control chip U1 is connected with the inverter unit through the second driving circuit.
In the photovoltaic inverter based on the Zeta converter, the information feedback part comprises a first feedback circuit, a second feedback circuit and a third feedback circuit, the first feedback circuit is used for detecting the output voltage of the Zeta conversion unit, the second feedback circuit is used for detecting the output voltage and the output current of the first filtering unit, and the third feedback circuit is used for detecting the working voltage and the working current of the second filtering unit.
In the photovoltaic inverter based on the Zeta converter, the first control part further comprises a zero-crossing detection circuit, and the zero-crossing detection circuit is used for detecting the cycle time of an external power grid.
In the photovoltaic inverter based on the Zeta converter, the second control part comprises a second control chip U2 and a WIFI chip, and the second control chip U2 is connected with the first control chip U1 and the WIFI chip respectively.
In the photovoltaic inverter based on the Zeta converter, the Zeta conversion unit further includes a first capacitor C1, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a third inductor L3, a fourth inductor L4, a first resistor R1, a fourth diode D4, and a fifth diode D5; one end of the first capacitor C1 is connected to the first filter unit, the other end of the first capacitor C1 is connected to one end of the third capacitor C3 and one end of the fourth capacitor C4, the other end of the third capacitor C3 is connected to the cathode of the fifth diode D5 and one end of the fourth inductor L4, the other end of the fourth inductor L4 is connected to one end of the fifth capacitor C5 and one end of the first resistor R1, the other end of the fourth capacitor C4 is connected to the cathode of the fourth diode D4 and one end of the third inductor L3, the other end of the fifth capacitor C5 and the other end of the third inductor L3 are connected to one end of the sixth capacitor C6, the other end of the first resistor R1, the other end of the sixth capacitor C6, the anode of the fourth diode D4 and the anode of the fifth diode D5 are grounded, respectively.
In the photovoltaic inverter based on the Zeta converter, the Zeta conversion unit further comprises a first diode D1, the positive electrode of the first diode D1 is connected with the source electrode of the field effect transistor Q, and the negative electrode of the first diode D1 is connected with one end of the first inductor L1, one end of the third capacitor C3, the positive electrode of the third diode D3 and one end of the fourth capacitor C4 respectively.
Has the advantages that:
the invention provides a photovoltaic inverter based on a Zeta converter, wherein a resonance part is an LCL resonance circuit, in the working process of the resonance part, energy storage inductors in the Zeta converter can be replaced by connecting inductors and capacitors in parallel and discharging in series, so that the voltage gain of the Zeta converter is improved, and the first inductor L1 and the second inductor L2 are magnetically integrated, so that the harmonic interference of the circuit can be greatly reduced, and the working effect and the working stability of the photovoltaic inverter are improved.
Drawings
Fig. 1 is a schematic structural diagram of a photovoltaic inverter provided by the present invention;
fig. 2 is a circuit configuration diagram of a Zeta conversion unit provided in the present invention;
fig. 3 is a schematic structural diagram of an embodiment of a photovoltaic inverter provided by the present invention.
Description of the main element symbols: the solar energy power supply control circuit comprises a power supply unit 1, a solar panel 11, a storage battery 12, a first filtering unit 2, a Zeta conversion unit 3, an inverter unit 4, a second filtering unit 5, a control unit 6, a first control chip U1, a first driving circuit 612, a second driving circuit 613, a first feedback circuit 614, a second feedback circuit 615, a third feedback circuit 616, a zero-crossing detection circuit 617 and a second control chip U2.
Detailed Description
The invention provides a photovoltaic inverter based on a Zeta converter, and in order to make the purpose, technical scheme and effect of the invention clearer and clearer, the invention is further described in detail by referring to the attached drawings and embodiments.
In the description of the present invention, it is to be understood that the terms "mounted," "connected," and the like are to be interpreted broadly, and those skilled in the art can understand the specific meanings of the above terms in the present invention according to specific situations.
Referring to fig. 1 to 3, the present invention provides a photovoltaic inverter based on a Zeta converter, including a first filtering unit 2, a Zeta converting unit 3, an inverting unit 4, a second filtering unit 5, and a control unit 6, where the first filtering unit 2 is connected to an external power supply unit 1, electric energy input by the external power supply unit 1 is processed by the first filtering unit 2, the Zeta converting unit 3, the inverting unit 4, and the second filtering unit 5 in sequence and then output to an external power grid, and the control unit 6 is configured to collect work information of the photovoltaic inverter and control work of the Zeta converting unit 3 and the inverting unit 4; the Zeta conversion unit 3 includes a field effect transistor Q and a resonance unit, the resonance unit includes a first inductor L1, a second inductor L2, a second diode D2, a third diode D3 and a second capacitor C2, a gate of the field effect transistor Q is connected to the control unit 6, a drain of the field effect transistor Q is connected to the first filter unit 2, a source of the field effect transistor Q is connected to one end of the first inductor L1 and an anode of the third diode D3, the other end of the first inductor L1 is connected to an anode of the second diode D2 and one end of the second capacitor C2, a cathode of the third diode D3 is connected to one end of the second inductor L2 and the other end of the second capacitor C2, and a cathode of the second diode D2 and the other end of the second inductor L2 are grounded.
The application discloses photovoltaic inverter based on Zeta converter, including resonance portion, resonance portion is LCL resonant circuit, and in resonance portion working process, through inductance and the parallelly connected energy storage of electric capacity, series discharge, can replace the energy storage inductance in the Zeta converter to improve Zeta converter's voltage gain, and first inductance L1 and second inductance L2 magnetism are integrated, the harmonic interference of the circuit that can significantly reduce, improve photovoltaic inverter's working effect and the stability of during operation.
In one embodiment, referring to fig. 3, the external power supply unit 1 includes a solar panel 11 and a storage battery 12, wherein the solar panel 11 is used for converting solar energy into electric energy, and the storage battery 12 is used for storing the electric energy fed back by the solar panel 11 and providing a stable operating voltage for the photovoltaic inverter.
In one embodiment, the first filtering unit 2 is an existing EMI filtering circuit, the second filtering unit 5 is an existing LCL filtering circuit, and the inverting unit 4 is an existing full-bridge inverting circuit; the first filtering unit 2 rectifies and filters the electric energy input by the storage battery 12, and the second filtering unit 5 rectifies and filters the electric energy output by the inverter unit 4 and then outputs the electric energy to an external power grid.
Further, please refer to fig. 3, the control unit 6 includes a first control part and a second control part electrically connected to each other, and the first control part is configured to collect the working information of the photovoltaic inverter and control and adjust the working states of the Zeta conversion unit 3 and the inversion unit 4; the second control part is used for transmitting the operation information of the photovoltaic inverter collected by the first control part to an external control mechanism.
Further, please refer to fig. 2 and fig. 3, the first control unit includes a first control chip U1611, and a driving unit and an information feedback unit electrically connected to the first control chip U1, respectively, the first control chip U1 is connected to the Zeta conversion unit 3 and the inverter unit 4 through the driving unit, the first control chip U1 outputs a PWM signal to control and adjust the working states of the Zeta conversion unit 3 and the inverter unit 4, and the information feedback unit is configured to collect the working information of the photovoltaic inverter; in one embodiment, the first control chip U1 is a DSP chip model No. DSP 28335.
Further, referring to fig. 3, the driving unit includes a first driving circuit 612 and a second driving circuit 613, the first control chip U1 is connected to the Zeta conversion unit 3 through the first driving circuit 612, and the first control chip U1 is connected to the inverter unit 4 through the second driving circuit 613; the first driving circuit 612 and the second driving circuit 613 are conventional driving circuits, and the first driving circuit 612 and the second driving circuit 613 modulate the PWM signal output by the first control chip U1 and output the modulated PWM signal to the Zeta conversion unit 3 and the inverter unit 4.
Further, referring to fig. 3, the information feedback portion includes a first feedback circuit 614, a second feedback circuit 615, and a third feedback circuit 616, where the first feedback circuit 614 is configured to detect the output voltage of the Zeta conversion unit 3, the second feedback circuit 615 is configured to detect the output voltage and the output current of the first filtering unit 2, and the third feedback circuit 616 is configured to detect the working voltage and the working current of the second filtering unit 5; the first feedback circuit 614 includes an existing voltage detection circuit and current detection circuit, the second feedback circuit 615 includes an existing voltage detection circuit and current detection circuit, and the third feedback circuit 616 includes an existing voltage detection circuit and current detection circuit.
Further, referring to fig. 3, the first control portion further includes a zero-crossing detection circuit 617, and the zero-crossing detection circuit 617 is configured to detect a cycle time of an external power grid and feed back detected data to the first control chip U1.
Further, referring to fig. 3, the second control portion includes a second control chip U2621 and a WIFI chip, and the second control chip U2 is connected to the first control chip U1 and the WIFI chip respectively; the second control chip U2 realizes wireless communication with an external control mechanism through a WIFI chip, and the external control mechanism can be an upper computer; the second control chip U2 can be connected with external equipment through an RS485 communication mode or an I/O port, and the external equipment can be an LED lamp, an operation key or a buzzer and the like, so that the function expansion of the photovoltaic inverter is realized, and the applicability and the use flexibility of the photovoltaic inverter are improved; in one embodiment, the second control chip U2 is a single chip microcomputer with the model number stm32f103ZET 6.
Further, referring to fig. 2 and fig. 3, the Zeta converting unit 3 further includes a first capacitor C1, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a third inductor L3, a fourth inductor L4, a first resistor R1, a fourth diode D4, and a fifth diode D5; one end of the first capacitor C1 is connected to the first filter unit 2, the other end of the first capacitor C1 is connected to one end of a third capacitor C3 and one end of a fourth capacitor C4, the other end of the third capacitor C3 is connected to a cathode of a fifth diode D5 and one end of a fourth inductor L4, the other end of the fourth inductor L4 is connected to one end of the fifth capacitor C5 and one end of a first resistor R1, the other end of the fourth capacitor C4 is connected to a cathode of a fourth diode D4 and one end of a third inductor L3, the other end of the fifth capacitor C5 and the other end of the third inductor L3 are connected to one end of a sixth capacitor C6, the other end of the first resistor R1, the other end of the sixth capacitor C6, an anode of the fourth diode D4 and an anode of the fifth diode D5 are grounded, respectively; the Zeta conversion unit 3 is composed of double Zeta conversion circuits, and can effectively increase the voltage gain of the photovoltaic inverter.
Further, referring to fig. 2 and fig. 3, the Zeta conversion unit 3 further includes a first diode D1, an anode of the first diode D1 is connected to the source of the field effect transistor Q, and a cathode of the first diode D1 is connected to one end of the first inductor L1, one end of the third capacitor C3, an anode of the third diode D3, and one end of the fourth capacitor C4, respectively; the first diode D1 is provided to improve the stability of the Zeta conversion unit 3 during operation.
In conclusion, the photovoltaic inverter based on the Zeta converter disclosed by the application comprises the Zeta conversion unit 3, the Zeta conversion unit 3 consists of the double Zeta conversion circuits, the LCL resonant circuit and the LC resonant circuit, the excellent characteristic that the Zeta conversion circuit current is continuous is fully utilized, the voltage gain of the photovoltaic inverter is increased, the harmonic interference on the photovoltaic inverter during working is greatly reduced, and the working effect and the working stability of the photovoltaic inverter are improved.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the protective scope of the present invention.
Claims (9)
1. A photovoltaic inverter based on a Zeta converter is characterized by comprising a first filtering unit, a Zeta conversion unit, an inversion unit, a second filtering unit and a control unit, wherein the first filtering unit is connected with an external power supply unit, electric energy input by the external power supply unit is output to an external power grid after being processed by the first filtering unit, the Zeta conversion unit, the inversion unit and the second filtering unit in sequence, and the control unit is used for collecting working information of the photovoltaic inverter and controlling the work of the Zeta conversion unit and the inversion unit; the Zeta conversion unit comprises a field effect transistor Q and a resonance part, wherein the resonance part comprises a first inductor L1, a second inductor L2, a second diode D2, a third diode D3 and a second capacitor C2, the grid electrode of the field effect transistor Q is connected with the control unit, the drain electrode of the field effect transistor Q is connected with the first filtering unit, the source electrode of the field effect transistor Q is respectively connected with one end of the first inductor L1 and the anode of the third diode D3, the other end of the first inductor L1 is respectively connected with the anode of the second diode D2 and one end of the second capacitor C2, the cathode electrode of the third diode D3 is respectively connected with one end of the second inductor L2 and the other end of the second capacitor C2, and the cathode electrode of the second diode D2 and the other end of the second inductor L2 are grounded.
2. The photovoltaic inverter based on the Zeta converter according to claim 1, wherein the control unit comprises a first control part and a second control part which are electrically connected, and the first control part is configured to collect operating information of the photovoltaic inverter and control and adjust operating states of the Zeta converter unit and the inverter unit; the second control part is used for transmitting the operation information of the photovoltaic inverter collected by the first control part to an external control mechanism.
3. A Zeta converter based photovoltaic inverter according to claim 2, wherein the first control unit comprises a first control chip U1, and a driving unit and an information feedback unit electrically connected to the first control chip U1, respectively, and the first control chip U1 is connected to the Zeta conversion unit and the inversion unit through the driving unit, respectively; the information feedback part is used for collecting the working information of the photovoltaic inverter.
4. A Zeta converter based photovoltaic inverter according to claim 3, wherein the driving unit comprises a first driving circuit and a second driving circuit, the first control chip U1 is connected to the Zeta converter unit through the first driving circuit, and the first control chip U1 is connected to the inverter unit through the second driving circuit.
5. A Zeta converter based photovoltaic inverter according to claim 3, wherein the information feedback unit comprises a first feedback circuit for detecting the output voltage of the Zeta converter unit, a second feedback circuit for detecting the output voltage and output current of the first filter unit, and a third feedback circuit for detecting the operating voltage and operating current of the second filter unit.
6. A Zeta converter based photovoltaic inverter according to claim 3, characterized in that the first control section further comprises a zero crossing detection circuit for detecting the cycle time of an external grid.
7. A Zeta converter based photovoltaic inverter according to claim 2, wherein the second control unit includes a second control chip U2 and a WIFI chip, and the second control chip U2 is connected to the first control chip U1 and the WIFI chip respectively.
8. A Zeta converter based photovoltaic inverter according to claim 1, wherein the Zeta converter unit further comprises a first capacitor C1, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a third inductor L3, a fourth inductor L4, a first resistor R1, a fourth diode D4, and a fifth diode D5; one end of the first capacitor C1 is connected to the first filter unit, the other end of the first capacitor C1 is connected to one end of the third capacitor C3 and one end of the fourth capacitor C4, the other end of the third capacitor C3 is connected to the cathode of the fifth diode D5 and one end of the fourth inductor L4, the other end of the fourth inductor L4 is connected to one end of the fifth capacitor C5 and one end of the first resistor R1, the other end of the fourth capacitor C4 is connected to the cathode of the fourth diode D4 and one end of the third inductor L3, the other end of the fifth capacitor C5 and the other end of the third inductor L3 are connected to one end of the sixth capacitor C6, the other end of the first resistor R1, the other end of the sixth capacitor C6, the anode of the fourth diode D4 and the anode of the fifth diode D5 are grounded, respectively.
9. A Zeta converter-based photovoltaic inverter according to claim 6, wherein the Zeta converter unit further comprises a first diode D1, the anode of the first diode D1 is connected with the source of the field effect transistor Q, and the cathode of the first diode D1 is connected with one end of a first inductor L1, one end of a third capacitor C3, the anode of a third diode D3 and one end of a fourth capacitor C4, respectively.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113992149A (en) * | 2021-11-17 | 2022-01-28 | 西安石油大学 | ZETA photovoltaic inverter |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104796065A (en) * | 2015-05-04 | 2015-07-22 | 苏州常实工业设备有限公司 | Control circuit of wind-solar grid-connected power generation system on expressway |
| CN111431399A (en) * | 2020-04-30 | 2020-07-17 | 三峡大学 | Novel expandable Cuk DC-DC converter |
| CN111446854A (en) * | 2020-04-30 | 2020-07-24 | 三峡大学 | Novel expandable Zeta DC-DC converter |
-
2020
- 2020-12-29 CN CN202011596624.6A patent/CN112701943A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104796065A (en) * | 2015-05-04 | 2015-07-22 | 苏州常实工业设备有限公司 | Control circuit of wind-solar grid-connected power generation system on expressway |
| CN111431399A (en) * | 2020-04-30 | 2020-07-17 | 三峡大学 | Novel expandable Cuk DC-DC converter |
| CN111446854A (en) * | 2020-04-30 | 2020-07-24 | 三峡大学 | Novel expandable Zeta DC-DC converter |
Non-Patent Citations (1)
| Title |
|---|
| 荣德生 等: "一种新型磁集成二次型开关电感单元", 《电机与控制学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113992149A (en) * | 2021-11-17 | 2022-01-28 | 西安石油大学 | ZETA photovoltaic inverter |
| CN113992149B (en) * | 2021-11-17 | 2023-11-28 | 西安石油大学 | ZETA photovoltaic inverter |
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