CN110557041A - Photovoltaic inverter control method - Google Patents
Photovoltaic inverter control method Download PDFInfo
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- CN110557041A CN110557041A CN201910964683.5A CN201910964683A CN110557041A CN 110557041 A CN110557041 A CN 110557041A CN 201910964683 A CN201910964683 A CN 201910964683A CN 110557041 A CN110557041 A CN 110557041A
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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
- H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/538—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a push-pull configuration
- H02M7/53803—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a push-pull configuration with automatic control of output voltage or current
-
- 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
- H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
- H02M7/53873—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with digital control
-
- 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
- H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/539—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
- H02M7/5395—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a photovoltaic inverter control method, which comprises a DC/AC converter module and a DC/AC inverter module, the DC/AC converter module circuit adopts a push-pull circuit, the DC/DC converter is composed of a push-pull inverter circuit, a high-frequency transformer, a rectifying circuit and a filter inductor and converts 62V direct current voltage output by a solar panel into 400V direct current voltage, a main circuit of the DC/AC converter adopts a full-bridge structure and is composed of 4 MOS tubes, an anti-parallel diode is parasitized in the MOS tube, 400V direct current is converted into 220V/50Hz power frequency alternating current, the DC/AC converter control circuit takes an integrated circuit SG3525 as a core, and two paths of 50kHz driving signals output by SG3525 are applied to gates of switching tubes Q1 and Q2 of a push-pull circuit through a gate driving circuit. The invention realizes the protection function of limiting output overcurrent and overvoltage, ensures the safety of solar power generation equipment and the service life of a load, and can well track the voltage waveform of a power grid by output current.
Description
Technical Field
The invention relates to the field of photovoltaic power generation, in particular to a photovoltaic inverter control method.
Background
Photovoltaic power generation is a technology of directly converting light energy into electric energy by using the photovoltaic effect of a semiconductor interface. The solar energy power generation system mainly comprises a solar panel, a controller and an inverter, and the main components of the system are electronic components.
The photovoltaic inverter is an important element in the photovoltaic power generation process, the main function of the inverter is to connect the solar energy converted into electric energy with a power grid or a load, and the inverter has an important transition function.
Disclosure of Invention
the invention aims to solve the defects in the prior art and provides a photovoltaic inverter control method.
In order to achieve the purpose, the invention adopts the following technical scheme:
The photovoltaic inverter control method comprises a DC/AC converter module and a DC/AC inverter module, wherein the DC/AC converter module circuit adopts a push-pull circuit, the DC/DC converter is composed of a push-pull inverter circuit, a high-frequency transformer, a rectifying circuit and a filter inductor and converts 62V direct current voltage output by a solar panel into 400V direct current voltage, a main circuit of the DC/AC inverter adopts a full-bridge structure and is composed of 4 MOS tubes, and anti-parallel diodes are parasitized in the MOS tubes and convert the 400V direct current into 220V/50Hz power frequency alternating current.
Preferably, the DC/AC converter control circuit is based on an integrated circuit SG3525, and two 50kHz driving signals output from SG3525 are applied to gates of the push-pull switching transistors Q1 and Q2 through a gate driving circuit. In order to keep the output voltage of the DC/DC converter stable, the detected output voltage is compared with the command voltage, the error voltage controls the duty ratio of the output driving signal of SG3525 after passing through a PI regulator, when the output current of the DC/DC converter is detected to be overlarge, SG3525 reduces the width of a gate pulse and the output voltage, and when the output voltage is overhigh, the operation of the DC/DC converter is stopped.
Preferably, the core control chip of the DC/AC inverter adopts a TMS320F240 chip, and the TMS320F240 chip control software includes four programs, namely a main program, a T1 underflow interrupt program, a T2 underflow interrupt program and a synchronous interrupt program.
Preferably, the T1 underflow interrupt routine occurs every 50 μ s, and the routine is primarily used to generate PWM waves.
Preferably, the T2 underflow interrupt routine occurs every 10ms, and the routine is primarily used to generate a current command.
Preferably, the sync interrupt routine occurs every 10ms to 30 ms.
The invention has the beneficial effects that:
1. When the DC/DC converter output current is detected to be overlarge, SG3525 reduces the width of a gate pulse, reduces the output voltage and further reduces the output current. When the output voltage is too high, the DC/DC converter stops working, so that the protection function of limiting output overcurrent and overvoltage is realized, and the safety of solar power generation equipment and the service life of a load are guaranteed.
2. the topological structure of the DC/DC controller adopts a push-pull circuit, and is controlled by a chip SG3525, the circuit effectively prevents magnetic biasing, the DC/AC inverter is a full-bridge inverter circuit and is controlled by a DSP, and the output current of the inverter can well track the voltage waveform of a power grid because the computing speed of the DSP is higher.
Drawings
Fig. 1 is a schematic circuit block diagram of a photovoltaic inverter control method according to the present invention;
FIG. 2 is a topological diagram of a DC/AC converter of the photovoltaic inverter control method according to the present invention;
Fig. 3 is a flow chart of TMS320F240 software control of the pv inverter control method according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Embodiment 1, referring to fig. 1, 2 and 3, a photovoltaic inverter control method includes a DC/AC converter module and a DC/AC inverter module, the DC/AC converter module circuit employs a push-pull circuit, the DC/DC converter is composed of a push-pull inverter circuit, the high-frequency transformer, the rectifying circuit and the filter inductor convert the 62V direct current voltage output by the solar panel into 400V direct current voltage, the main circuit of the DC/AC inverter adopts a full-bridge structure and is composed of 4 MOS tubes, anti-parallel diodes are parasitized in the MOS tubes, the DC/AC inverter converts the 400V direct current into 220V/50Hz power frequency alternating current DC/AC converter control circuit takes an integrated circuit SG3525 as a core, and two 50kHz driving signals output by the SG3525 are added to gates of switching tubes Q1 and Q2 of a push-pull circuit through a gate driving circuit. In order to keep the output voltage of the DC/DC converter stable, the detected output voltage is compared with the command voltage, the error voltage controls the duty ratio of an SG3525 output driving signal after passing through a PI regulator, when the output current of the DC/DC converter is detected to be overlarge, the SG3525 reduces the width of a gate pulse and reduces the output voltage, when the output voltage is overhigh, a TMS320F240 chip is adopted by a core control chip of the DC/AC inverter which stops the work of the DC/DC converter, and the TMS320F240 chip control software comprises four programs, namely a main program, a T1 underflow interrupt program, a T2 underflow interrupt program and a synchronous interrupt program.
The T1 underflow interrupt routine occurs every 50 mus, the routine is primarily used to generate PWM waves, the T2 underflow interrupt routine occurs every 10ms, the routine is primarily used to generate current commands, and the sync interrupt routine occurs every 10 ms.
Embodiment 2, referring to fig. 1, 2 and 3, a photovoltaic inverter control method includes a DC/AC converter module and a DC/AC inverter module, the DC/AC converter module circuit employs a push-pull circuit, the DC/DC converter is composed of a push-pull inverter circuit, the high-frequency transformer, the rectifying circuit and the filter inductor convert the 62V direct current voltage output by the solar panel into 400V direct current voltage, the main circuit of the DC/AC inverter adopts a full-bridge structure and is composed of 4 MOS tubes, anti-parallel diodes are parasitized in the MOS tubes, the DC/AC inverter converts the 400V direct current into 220V/50Hz power frequency alternating current DC/AC converter control circuit takes an integrated circuit SG3525 as a core, and two 50kHz driving signals output by the SG3525 are added to gates of switching tubes Q1 and Q2 of a push-pull circuit through a gate driving circuit. In order to keep the output voltage of the DC/DC converter stable, the detected output voltage is compared with the command voltage, the error voltage controls the duty ratio of an SG3525 output driving signal after passing through a PI regulator, when the output current of the DC/DC converter is detected to be overlarge, the SG3525 reduces the width of a gate pulse and reduces the output voltage, when the output voltage is overhigh, a TMS320F240 chip is adopted by a core control chip of the DC/AC inverter which stops the work of the DC/DC converter, and the TMS320F240 chip control software comprises four programs, namely a main program, a T1 underflow interrupt program, a T2 underflow interrupt program and a synchronous interrupt program.
The T1 underflow interrupt routine occurs every 50 mus, the routine is primarily used to generate PWM waves, the T2 underflow interrupt routine occurs every 10ms, the routine is primarily used to generate current commands, and the sync interrupt routine occurs every 20 ms.
The difference between this embodiment and embodiment 1 is that the interval time between the generation of the sync interrupt routine is changed from once every 10ms to once every 20ms, and none of the other events is changed.
embodiment 3, referring to fig. 1, 2 and 3, a photovoltaic inverter control method includes a DC/AC converter module and a DC/AC inverter module, the DC/AC converter module circuit employs a push-pull circuit, the DC/DC converter is composed of a push-pull inverter circuit, the high-frequency transformer, the rectifying circuit and the filter inductor convert the 62V direct current voltage output by the solar panel into 400V direct current voltage, the main circuit of the DC/AC inverter adopts a full-bridge structure and is composed of 4 MOS tubes, anti-parallel diodes are parasitized in the MOS tubes, the DC/AC inverter converts the 400V direct current into 220V/50Hz power frequency alternating current DC/AC converter control circuit takes an integrated circuit SG3525 as a core, and two 50kHz driving signals output by the SG3525 are added to gates of switching tubes Q1 and Q2 of a push-pull circuit through a gate driving circuit. In order to keep the output voltage of the DC/DC converter stable, the detected output voltage is compared with the command voltage, the error voltage controls the duty ratio of an SG3525 output driving signal after passing through a PI regulator, when the output current of the DC/DC converter is detected to be overlarge, the SG3525 reduces the width of a gate pulse and reduces the output voltage, when the output voltage is overhigh, a TMS320F240 chip is adopted by a core control chip of the DC/AC inverter which stops the work of the DC/DC converter, and the TMS320F240 chip control software comprises four programs, namely a main program, a T1 underflow interrupt program, a T2 underflow interrupt program and a synchronous interrupt program.
The T1 underflow interrupt routine occurs every 50 mus, the routine is primarily used to generate PWM waves, the T2 underflow interrupt routine occurs every 10ms, the routine is primarily used to generate current commands, and the sync interrupt routine occurs every 25 ms.
The difference between this embodiment and embodiment 1 is that the interval time between the generation of the sync interrupt routine is changed from the original generation every 10ms to the generation every 25ms, and the others are not changed.
When the DC/DC converter output current is detected to be overlarge, SG3525 reduces the width of a gate pulse, reduces the output voltage and further reduces the output current. When the output voltage is over high, the DC/DC converter stops working, a magnetic saturation detection circuit is arranged in the circuit, when the current of two branches flowing through a push-pull circuit is unbalanced, the soft start function of SG3525 is started, the DC/DC converter is restarted, a transformer is reset, when the output voltage of the solar cell panel is over-voltage and under-voltage faults, a signal is sent to SG3525 by TMS320F240 to block DC/DC pulses to stop working, when the direct current voltage is detected to be recovered to be normal, the DC/DC automatically resets to start working, when the alternating current over-current and over-temperature faults occur, the program enters an interrupt service subprogram to block all driving signals. And when the fault is eliminated, the system is manually reset and restarted.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. The photovoltaic inverter control method is characterized in that a DC/AC converter module circuit adopts a push-pull circuit, the DC/DC converter is composed of a push-pull inverter circuit, a high-frequency transformer, a rectifying circuit and a filter inductor and converts 62V direct current voltage output by a solar panel into 400V direct current voltage, a main circuit of the DC/AC inverter adopts a full-bridge structure and is composed of 4 MOS (metal oxide semiconductor) tubes, and anti-parallel diodes are parasitized in the MOS tubes and convert the 400V direct current into 220V/50Hz power frequency alternating current.
2. the method of claim 1, wherein the DC/AC converter control circuit is based on an integrated circuit SG3525, and two 50kHz driving signals outputted from SG3525 are applied to gates of the push-pull switching transistors Q1 and Q2 through a gate driving circuit.
3. In order to keep the output voltage of the DC/DC converter stable, the detected output voltage is compared with the command voltage, the error voltage controls the duty ratio of the output driving signal of SG3525 after passing through a PI regulator, when the output current of the DC/DC converter is detected to be overlarge, SG3525 reduces the width of a gate pulse and the output voltage, and when the output voltage is overhigh, the operation of the DC/DC converter is stopped.
4. The pv inverter control method of claim 1, wherein the core DC/AC inverter control chip is a TMS320F240 chip, and the TMS320F240 chip control software includes four programs, i.e., a main program, a T1 underflow interrupt program, a T2 underflow interrupt program, and a sync interrupt program.
5. The pv inverter control method of claim 3 wherein the T1 underflow interrupt routine occurs once every 50 μ β, the routine being primarily for generating PWM waves.
6. The pv inverter control method of claim 3 wherein the T2 underflow interrupt routine occurs once every 10ms, the routine being used primarily to generate the current command.
7. The pv inverter control method of claim 3 wherein the sync break routine occurs every 10ms to 30 ms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910964683.5A CN110557041A (en) | 2019-10-11 | 2019-10-11 | Photovoltaic inverter control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910964683.5A CN110557041A (en) | 2019-10-11 | 2019-10-11 | Photovoltaic inverter control method |
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| Publication Number | Publication Date |
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| CN110557041A true CN110557041A (en) | 2019-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910964683.5A Withdrawn CN110557041A (en) | 2019-10-11 | 2019-10-11 | Photovoltaic inverter control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117713198A (en) * | 2023-12-08 | 2024-03-15 | 广州云酷智能设备有限公司 | Grid-connected inverter control core module and photovoltaic power conversion cabinet |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202712871U (en) * | 2012-05-14 | 2013-01-30 | 厦门镁尔捷能源技术有限公司 | Integrated alternating current grid-connected solar power generation system |
| CN204156541U (en) * | 2014-11-20 | 2015-02-11 | 广东梅雁吉祥水电股份有限公司 | A kind of microcomputer controlled photovoltaic synchronization inverter system |
| CN104638965A (en) * | 2013-11-08 | 2015-05-20 | 天津职业技术师范大学 | Off-grid photovoltaic power generation system inverter circuit |
-
2019
- 2019-10-11 CN CN201910964683.5A patent/CN110557041A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202712871U (en) * | 2012-05-14 | 2013-01-30 | 厦门镁尔捷能源技术有限公司 | Integrated alternating current grid-connected solar power generation system |
| CN104638965A (en) * | 2013-11-08 | 2015-05-20 | 天津职业技术师范大学 | Off-grid photovoltaic power generation system inverter circuit |
| CN204156541U (en) * | 2014-11-20 | 2015-02-11 | 广东梅雁吉祥水电股份有限公司 | A kind of microcomputer controlled photovoltaic synchronization inverter system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117713198A (en) * | 2023-12-08 | 2024-03-15 | 广州云酷智能设备有限公司 | Grid-connected inverter control core module and photovoltaic power conversion cabinet |
| CN117713198B (en) * | 2023-12-08 | 2024-05-24 | 广州云酷智能设备有限公司 | Grid-connected inverter control core module and photovoltaic power conversion cabinet |
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Application publication date: 20191210 |
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