CN110635703A - Grid-connected inverter control system - Google Patents
Grid-connected inverter control system Download PDFInfo
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- CN110635703A CN110635703A CN201910767637.6A CN201910767637A CN110635703A CN 110635703 A CN110635703 A CN 110635703A CN 201910767637 A CN201910767637 A CN 201910767637A CN 110635703 A CN110635703 A CN 110635703A
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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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0012—Control circuits using digital or numerical techniques
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- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention provides a grid-connected inverter control system, comprising: the device comprises a direct current input module, an MPPT module, a control module, a DC/AC converter, an LC filtering module, an isolation transformation module, a current detection module and a load; the direct current input module is connected with the input end of the DC/AC converter, the output end of the DC/AC converter is connected with the input end of the isolation transformation module through the LC filter module, and the output end of the isolation transformation module is connected with the load; the control module is respectively connected with the MPPT module, the control end of the DC/AC converter and the current detection module, and the MPPT module is connected with the signal end of the DC input module.
Description
Technical Field
The invention relates to the technical field of inverter control, in particular to a grid-connected inverter control system.
Background
With the rapid development of all industries in the world, fossil energy is limited to predatory crazy use, so crazy exploitation can be used up in one day. In addition, burning fossil fuels can continue to bring serious problems such as an unthinkable ecological environment and the like, and the survival and development of human beings are greatly restricted. Under such circumstances, solar energy that can be continuously regenerated is naturally attracting attention. Today, the world is competitive to develop green renewable energy, solar energy is favored by its unique advantages, and the application of solar energy is concerned in various applications. With the continuous reduction of the price of the components and the development of the technology, the solar power generation system gradually transits from the current supplementary energy to the alternative energy. An independent power generation system and a grid-connected power generation system become mainstream of application, and an inversion technology is one of core technologies.
The traditional grid-connected power generation scheme is as follows: the grid-connected inverter converts the direct current generated by the solar battery into alternating current meeting the requirements of the power grid and outputs the alternating current to the power grid. The general grid-connected inverter usually adopts an analog digital circuit or a special IC to realize control, and the function is relatively single; the maximum power tracking can not be realized, and the voltage of the output power supply can be adjusted by a manual adjusting key; it is impossible to dynamically track the reference frequency by using the reference frequency as the reference frequency without supporting the manually set output frequency.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a grid-connected inverter control system.
In order to achieve the purpose, the invention is realized by the following technical scheme: a grid-tied inverter control system comprising: the device comprises a direct current input module, an MPPT module, a control module, a DC/AC converter, an LC filtering module, an isolation transformation module, a current detection module and a load; the direct current input module is connected with the input end of the DC/AC converter, the output end of the DC/AC converter is connected with the input end of the isolation transformation module through the LC filter module, and the output end of the isolation transformation module is connected with the load; the control module is respectively connected with the MPPT module, the control end of the DC/AC converter and the current detection module, and the MPPT module is connected with the signal end of the DC input module.
Further, the control circuit comprises an IR2110 driving circuit, the control module is connected with a control end of the DC/AC converter through the IR2110 driving circuit, and an SPWM waveform output by the control module drives an H bridge through the R2110 driving circuit to control DC-AC inversion.
Further, the direct current input module is connected with the input end of the MPPT module and used for providing input voltage for the MPPT module; the output end of the MPPT module is connected with the control module; the control module is used for obtaining the output voltage signal and the output current signal of the MPPT module and then carrying out MPPT algorithm operation to obtain the control quantity of the MPPT module, so that the direct current input module achieves the maximum output power.
Further, the DC/AC converter generates a sine wave with interference and outputs a standard sine wave through an LC filtering module, wherein the LC filtering module comprises an inductor L1, an inductor L2, a capacitor C1, a capacitor C2 and a capacitor C3; a first end of the inductor L1 is connected with an input end of the DC/AC converter, and a second end of the inductor L1 is connected with a first end of the capacitor C1; a first end of the inductor L2 is connected with the input end of the isolation transformation module, and a second end of the inductor L2 is connected with a second end of the capacitor C1; the capacitor C2 and the capacitor C3 are respectively connected with the capacitor C1 in parallel.
Further, the direct current input module is a voltage-stabilizing direct current power supply.
Further, the control module is also connected with an input module and a display module, the input module is used for manually adjusting output voltage, and the display module is used for displaying detection parameter information in real time.
Further, the current detection module is used for collecting the output current of the isolation transformation module, the output current is processed and sampled by a measurement amplification circuit in the isolation transformation module and then is sent to the control module for judgment, and when the amplitude of the output current exceeds a preset threshold value, the control module sends a protection signal to the DC/AC converter.
Further, the control module adopts a single chip microcomputer with the model number of STM32F103CBT 6.
Further, the isolation transformation module adopts an isolation transformer.
Furthermore, the input module adopts a mechanical keyboard, and the display module adopts a liquid crystal display screen.
Compared with the prior art, the invention has the following beneficial effects: the invention provides a grid-connected inverter control system which can complete maximum power tracking and can adjust the voltage of an output power supply by a manual adjusting key; the STM32 single chip microcomputer software is used for realizing the phase-locked loop, the manually set output frequency can be supported, and the reference frequency can also be used as the reference frequency. Thus, the reference frequency can be dynamically tracked.
The invention has simple structure and reasonable design, can detect the operation parameters of the grid-connected inverter in real time, can realize flexible control of the grid-connected inverter, realizes the optimal energy utilization rate, improves the stability of grid connection, and has simple and convenient operation, strong practicability, good use effect and high popularization value.
Therefore, compared with the prior art, the invention has prominent substantive features and remarkable progress, and the beneficial effects of the implementation are also obvious.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a circuit configuration diagram of an LC filter module of the present invention.
FIG. 3 is an outline view of the single chip microcomputer STM32F103CBT 6.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings.
A grid-connected inverter control system as shown in fig. 1 includes: the device comprises a direct current input module, an MPPT module, a control module, a DC/AC converter, an IR2110 driving circuit, an LC filtering module, an isolation transformation module, a current detection module, a load, an input module and a display module;
the direct current input module is connected with the input end of the DC/AC converter, the output end of the DC/AC converter is connected with the input end of the isolation transformation module through the LC filtering module, and the output end of the isolation transformation module is connected with the load.
The control module is respectively connected with the MPPT module, the current detection module, the input module and the display module, the control module is connected with the control end of the DC/AC converter through the IR2110 driving circuit, and the SPWM waveform output by the control module drives the H bridge through the R2110 driving circuit and is used for controlling DC-AC inversion. The input module is used for manually adjusting output voltage, and the display module is used for displaying detection parameter information in real time.
The direct current input module is connected with the input end of the MPPT module and used for providing input voltage for the MPPT module; the output end of the MPPT module is connected with the control module; the control module is used for obtaining the output voltage signal and the output current signal of the MPPT module and then carrying out MPPT algorithm operation to obtain the control quantity of the MPPT module, so that the direct current input module achieves the maximum output power.
The DC/AC converter generates a sine wave with interference and outputs a standard sine wave through the LC filter module, as shown in fig. 2, the LC filter module includes an inductor L1, an inductor L2, a capacitor C1, a capacitor C2, and a capacitor C3; a first end of the inductor L1 is connected with an input end of the DC/AC converter, and a second end of the inductor L1 is connected with a first end of the capacitor C1; a first end of the inductor L2 is connected with the input end of the isolation transformation module, and a second end of the inductor L2 is connected with a second end of the capacitor C1; the capacitor C2 and the capacitor C3 are respectively connected with the capacitor C1 in parallel.
Because the H bridge works in a high-frequency SPWM waveform mode, the extractor mainly has the function of filtering high-order harmonic liquid components, so that the obtained waveform is very close to sinusoidal liquid. The principle of the discharge should be that the waveform of the output voltage is as small as possible and has good frequency-blocking characteristic. However, the inductance value actually calculated is not readily available on the market, and the most common LC filter circuit is selected by referring to the conventional empirical formula.
The current detection module is used for collecting output current of the isolation transformation module, the output current is processed and sampled by a measurement amplification circuit in the isolation transformation module and then is sent to the control module for judgment, and when the amplitude of the output current exceeds a preset threshold value, the control module sends a protection signal to the DC/AC converter.
In addition, the direct current input module is a voltage-stabilizing direct current power supply; the isolation transformation module adopts an isolation transformer; the input module adopts a mechanical keyboard; the display module adopts a liquid crystal display screen.
As shown in fig. 3, the control module adopts a single chip microcomputer with the model number of STM32F103CBT 6. The invention adopts the single chip microcomputer STM32F103CBT6 as a main control chip, has a Cortex-M3 kernel with an advanced architecture, excellent real-time performance, superior efficacy, advanced and innovative peripheral equipment, maximum integration and easy development, and the whole product series has high compatibility of feet to feet, peripheral equipment and software, thereby providing the maximum flexibility for users. Without changing the original invention and software, the user can upgrade to a higher storage capacity or downgrade to a lower storage capacity, or change to a different packaging format. And thus employs the chip as a processor of the present invention.
The invention takes an STM32F103CBT6 singlechip as a core, and an SPWM waveform output by the singlechip drives an H bridge through R2110 to realize DC-AC inversion. The DC-AC conversion efficiency is higher and can exceed 85 percent. The invention can complete maximum power tracking, and can adjust the voltage of the output power supply by manually adjusting the key; the phase-locked loop is realized by using single-chip microcomputer software, and can support manually set output frequency and also can use reference frequency as reference frequency.
The invention is further described with reference to the accompanying drawings and specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and these equivalents also fall within the scope of the present application.
Claims (10)
1. A grid-connected inverter control system, comprising: the device comprises a direct current input module, an MPPT module, a control module, a DC/AC converter, an LC filtering module, an isolation transformation module, a current detection module and a load; the direct current input module is connected with the input end of the DC/AC converter, the output end of the DC/AC converter is connected with the input end of the isolation transformation module through the LC filter module, and the output end of the isolation transformation module is connected with the load; the control module is respectively connected with the MPPT module, the control end of the DC/AC converter and the current detection module, and the MPPT module is connected with the DC input module.
2. The grid-connected inverter control system according to claim 1, further comprising an IR2110 driving circuit, wherein the control module is connected to the control terminal of the DC/AC converter through the IR2110 driving circuit, and the SPWM waveform outputted by the control module drives the H-bridge through the R2110 driving circuit for controlling DC-AC inversion.
3. The grid-connected inverter control system according to claim 1, wherein the dc input module is connected to an input terminal of the MPPT module, and configured to provide an input voltage to the MPPT module; the output end of the MPPT module is connected with the control module; the control module is used for obtaining the output voltage signal and the output current signal of the MPPT module and then carrying out MPPT algorithm operation to obtain the control quantity of the MPPT module, so that the direct current input module achieves the maximum output power.
4. The grid-connected inverter control system according to claim 1, wherein the DC/AC converter generates a sine wave with interference and outputs a standard sine wave through an LC filter module, and the LC filter module comprises an inductor L1, an inductor L2, a capacitor C1, a capacitor C2 and a capacitor C3;
a first end of the inductor L1 is connected with an input end of the DC/AC converter, and a second end of the inductor L1 is connected with a first end of the capacitor C1; a first end of the inductor L2 is connected with the input end of the isolation transformation module, and a second end of the inductor L2 is connected with a second end of the capacitor C1; the capacitor C2 and the capacitor C3 are respectively connected with the capacitor C1 in parallel.
5. The grid-connected inverter control system according to claim 1, wherein the dc input module is a regulated dc power supply.
6. The grid-connected inverter control system according to claim 1, wherein the control module is further connected with an input module and a display module, the input module is used for manually adjusting output voltage, and the display module is used for displaying detection parameter information in real time.
7. The grid-connected inverter control system according to claim 1, wherein the current detection module is configured to collect an output current of the isolation transformer module, the output current is processed and sampled by a measurement amplification circuit inside the isolation transformer module, and then is sent to the control module for judgment, and when an amplitude of the output current exceeds a preset threshold, the control module sends a protection signal to the DC/AC converter.
8. The grid-connected inverter control system according to claim 1, wherein the control module is a single chip microcomputer of type STM32F103CBT 6.
9. The grid-connected inverter control system according to claim 1, wherein the isolation transformation module employs an isolation transformer.
10. The grid-connected inverter control system according to claim 6, wherein the input module adopts a mechanical keyboard, and the display module adopts a liquid crystal display screen.
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| CN201910767637.6A CN110635703A (en) | 2019-08-20 | 2019-08-20 | Grid-connected inverter control system |
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Application publication date: 20191231 |