CN114243942A - Wireless photovoltaic power generation system based on energy information composite modulation technology - Google Patents
Wireless photovoltaic power generation system based on energy information composite modulation technology Download PDFInfo
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- CN114243942A CN114243942A CN202111564612.XA CN202111564612A CN114243942A CN 114243942 A CN114243942 A CN 114243942A CN 202111564612 A CN202111564612 A CN 202111564612A CN 114243942 A CN114243942 A CN 114243942A
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- 238000010248 power generation Methods 0.000 title claims abstract description 14
- 239000002131 composite material Substances 0.000 title claims abstract description 11
- 238000005516 engineering process Methods 0.000 title claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims abstract description 20
- 230000005540 biological transmission Effects 0.000 claims abstract description 18
- 230000003321 amplification Effects 0.000 claims abstract description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 6
- 230000008878 coupling Effects 0.000 claims description 23
- 238000010168 coupling process Methods 0.000 claims description 23
- 238000005859 coupling reaction Methods 0.000 claims description 23
- 230000007547 defect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/66—Regulating electric power
- G05F1/67—Regulating electric power to the maximum power available from a generator, e.g. from solar cell
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/005—Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
- H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Control Of Electrical Variables (AREA)
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Abstract
The invention discloses a wireless photovoltaic power generation system based on an energy information composite modulation technology, which comprises a main power forward path and an MPPT closed-loop control reverse path; the main power forward path is used for transmitting the electric energy output by the photovoltaic module to a load through steps of direct current conversion, inversion, power amplification, wireless energy transmission, rectification and the like; the MPPT closed-loop control reverse path is used for calling an MPPT algorithm according to actual power transmitted to a load by a main power forward path, generating high-frequency carrier signals with different amplitudes, transmitting the signals to a power transmitting side in a wireless energy transmission mode, converting the signals into direct-current voltage signals after demodulation and rectification, finally generating PWM driving pulses with different duty ratios according to the amplitudes of the direct-current voltage signals, controlling a switching tube in a direct-current chopping conversion module in the main power forward path, and realizing closed-loop control. The invention overcomes the defects of the traditional wired transmission mode; and only one microcontroller is needed to be configured on the load side, so that the system cost is greatly reduced.
Description
Technical Field
The invention relates to a photovoltaic power generation system, in particular to a wireless photovoltaic power generation system based on an energy information composite modulation technology.
Background
At present, in a traditional photovoltaic power generation system, electric energy output by a photovoltaic module is connected and transmitted through a junction box, and the wired transmission mode not only requires the junction box to have good waterproof performance, but also easily causes safety problems such as electric leakage and short circuit. In addition, there is also a technical scheme for transmitting the electric energy output by the photovoltaic module in a wireless energy transmission manner, but the technical scheme has the disadvantages that microcontrollers are required to be configured on both the power generation side and the receiving side, so that the cost is high, and the development difficulty is high.
Disclosure of Invention
In order to overcome the defects that the traditional photovoltaic module has high requirements on equipment performance and is easy to cause safety problems when energy is transmitted in a wired mode, the invention provides a wireless photovoltaic power generation system based on an energy information composite modulation technology.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a wireless photovoltaic power generation system based on an energy information composite modulation technology comprises the following modules: the device comprises a photovoltaic module, a direct current chopping conversion module, a power amplifier and inverter module I, a primary side compensation network module, a wireless energy transmission module, a secondary side compensation network module, a rectifier module I, a load module, an MPPT control module, a power amplifier and inverter module II, a demodulation module, a rectifier module II and a PWM drive generation module.
In the above technical solution, further, the system has two paths, namely a main power forward path and an MPPT closed-loop control reverse path, and transmits a low-frequency main power signal and a high-frequency carrier signal respectively. The frequency of the high-frequency carrier signal is in MHz level; the frequency of the low-frequency main power signal is 0.01-0.1 times of the frequency of the high-frequency carrier signal.
Furthermore, the power amplifier and inverter module I adopts E-type power amplifier with the frequency of 85 kHz; the power amplifier and inversion module II adopts E-type power amplifier with frequency of 1 MHz. The E-type power amplifier is used as a preceding stage circuit of magnetic coupling resonant wireless power transmission and a subsequent stage circuit of photovoltaic module output electric energy which is converted by direct current, the topology is simple, the required elements are few, soft switching can be realized, and the switching loss is greatly reduced.
The main power forward path is used for transmitting electric energy output by the photovoltaic module to a load through steps of direct current conversion, inversion, power amplification, wireless energy transmission, rectification and the like; the MPPT closed-loop control reverse path has the effects that an MPPT algorithm is called according to load power, a power amplifier and an inverter circuit on a receiving electric energy side are controlled to generate 1MHz high-frequency carrier signals with different amplitudes, the signals are transmitted to a transmitting electric energy side in a wireless energy transmission mode, the signals become direct current voltage signals after demodulation and rectification, PWM driving pulses with different duty ratios are generated according to the amplitudes of the direct current voltage signals, a switching tube in a direct current chopping conversion circuit in a main power forward path is controlled, and closed-loop control is achieved.
The circuit connection mode of the main power forward path in the invention is as follows: the output port of the photovoltaic module is connected with the input port of the direct current chopping conversion module; the output port of the direct current chopping conversion module is connected with the input port of the power amplifier and inversion module I, and the power amplification circuit adopts E-type power amplifier topology, so that the inversion and power amplification effects can be achieved at the same time; the output port of the power amplifier and inverter module I is connected with the input port of the primary side compensation network module; the output port of the primary side compensation network module is connected with the primary side port of the mutual inductance coupling coil in the wireless energy transfer module; the secondary side port of the mutual inductance coupling coil in the wireless energy transfer module is connected with the input port of the secondary side compensation network module; the output port of the secondary side compensation network module is connected with the input port of the rectification module I; and the output port of the rectifying module I is connected with the input port of the load module.
The MPPT closed-loop control reverse path circuit connection mode is as follows: because of the reverse path, the positions of the input and output ports of some modules are changed, for example, the input port of the secondary side compensation network module in the reverse path is the output port of the module in the forward path. The MPPT control module samples the power of the load module as an input signal of the module, and an output signal is used for controlling the voltage of a power supply in the power amplifier and inverter module II; the output port of the power amplifier and inversion module II is connected with the input port of the secondary compensation network module; the output port of the secondary compensation network module is connected with the secondary port of the mutual inductance coupling coil in the wireless energy transmission module; a primary side port of a mutual inductance coupling coil in the wireless energy transfer module is connected with an input port of a primary side compensation network module; the output port of the primary side compensation network module is connected with the input port of the demodulation module; the output port of the demodulation module is connected with the input port of the rectification module II; the output port of the rectification module II is connected with the input port of the PWM drive generation module; and the output of the PWM driving generation module is used for driving a switching tube in the direct current chopping conversion module.
The invention has the beneficial effects that:
the electric energy output by the photovoltaic module is transmitted in a wireless energy transmission mode, so that the defects of the traditional wired transmission mode are overcome, the requirement on equipment is low, the possibility of generating safety problems is greatly reduced, and the stability and the safety of the system are improved; in addition, the energy information composite modulation technology is adopted, the mutual inductance coupling coil is expanded into a bidirectional path, so that the system has two paths of a forward path (main power) and a reverse path (high-frequency control signal), only one microcontroller is required to be configured on the load side, the microcontroller is not required to be configured on the photovoltaic module power generation side, and the cost of the system is greatly reduced.
Drawings
FIG. 1 is a block diagram of the system modules of the present invention;
FIG. 2 is a schematic overall system of the present invention;
FIG. 3 is a schematic diagram of an embodiment of the present invention;
the photovoltaic module comprises a photovoltaic module 1, a circuit board 2 at the electric energy sending side, a mutual inductance coupling coil primary side 3, a circuit board 4 at the electric energy receiving side, a mutual inductance coupling coil secondary side 5, a photovoltaic module support 6 and a wall body 7;
Detailed Description
In fig. 1, specific circuit compositions of the respective modules are as follows. The photovoltaic module 1 is a photovoltaic panel in a popular sense, that is, a module formed by packaging a certain number of single photovoltaic cells in series and parallel. The direct current chopping conversion module comprises a direct current chopping conversion circuit, and the direct current chopping conversion module is realized by adopting a Buck circuit. The power amplifier and inversion module I (class E power amplifier, 85kHz) comprises a class E power amplifier which is used for inverting a main power direct current signal into a sinusoidal signal of 85kHz under the condition of soft switching and carrying out power amplification, and the main power signal is transmitted in the forward direction through a main power forward path. The demodulation module comprises a demodulation circuit for demodulating the reverse transmitted high frequency 1MHz carrier signal from the 85kHz main power signal. The rectifying module I and the rectifying module II have the same structure and both comprise an uncontrolled full-bridge rectifying circuit. The PWM driving generation module comprises a PWM generation chip and a peripheral circuit thereof, different direct current voltage inputs are mapped into PWM driving with different duty ratios, and the PWM generation chip only needs to use a universal chip. The primary side compensation network module comprises a series compensation circuit for the primary side of the mutual inductance coupling coil, and because a forward path and a reverse path exist in the system and the frequency of transmitted signals is different, two branches need to be connected in parallel to realize the compensation of the forward and reverse signals. The wireless energy transfer module is composed of a pair of mutual inductance coupling coils, wherein the primary side of each mutual inductance coupling coil refers to a coil on the electric energy sending side, and the secondary side of each mutual inductance coupling coil refers to a coil on the main power electric energy receiving side. The secondary side compensation network module and the primary side compensation network module have the same structure. The power amplifier and inversion module II (E type power amplifier, 1MHz) comprises an E type power amplifier for inverting the low-power direct current signal into a sinusoidal signal of 1MHz under the condition of soft switching, and the signal is reversely transmitted through an MPPT closed-loop control reverse path. The load module is the load of the system, and the load module is a pure resistance load in the invention. The MPPT control module comprises a microcontroller and a peripheral circuit, carries out power sampling on a load, calls an MPPT algorithm, changes the power supply voltage of a power amplifier and inverter module II (class E power amplifier, 1MHz), and realizes the maximum power tracking of the load.
In the overall schematic diagram of the system shown in fig. 2, 1 is a photovoltaic module; the circuit board 2 at the electric energy sending side is loaded with a direct current chopping conversion module, a power amplifier and inverter module I (class E power amplifier, 85kHz), a primary side compensation network module, a demodulation module, a rectification module II and a PWM drive generation module; the primary side 3 of the mutual inductance coupling coil and the secondary side 5 of the mutual inductance coupling coil form a wireless energy transfer module; the circuit board 4 at the side of receiving electric energy is loaded with a secondary compensation network module, a rectifier module I, a load module, an MPPT control module and a power amplifier and inverter module II (class E power amplifier, 1 MHz).
In one embodiment schematic shown in fig. 3, the main power forward path is implemented as follows: the photovoltaic module 1 is placed above a wall body 7 through the support of a photovoltaic module support 6, electric energy output by the photovoltaic module 1 is firstly transmitted to a circuit board 2 on the electric energy transmitting side, is converted into a form of 85kHz sinusoidal signals under the action of a direct current chopping conversion module and a power amplifier and inverter module I (class E power amplifier, 85kHz), enters a primary side compensation network module, is transmitted to a secondary side 5 of a mutual inductance coupling coil from a primary side 3 of the mutual inductance coupling coil through a wireless energy transmission module, is transmitted to a circuit board 4 on the electric energy receiving side, and finally reaches a load module through the secondary side compensation network module and a rectification module I. The MPPT closed-loop control reverse path is implemented as follows: the MPPT control module on the circuit board 4 on the receiving electric energy side samples the power of a load module, and calls an MPPT algorithm, the power supply voltage of a power amplifier and inversion module II (E type power amplifier, 1MHz) is changed, a 1MHz high-frequency carrier signal generated by the power amplifier and inversion module II (E type power amplifier, 1MHz) enters a mutual inductance coupling coil secondary side 5 through a secondary side compensation network module, and is transmitted to a mutual inductance coupling coil primary side 3 from the mutual inductance coupling coil secondary side 5 through a wireless energy transmission module, and then enters a circuit board 2 on the sending electric energy side, and enters a demodulation module and a rectification module II after passing through the primary side compensation network module, the rectification module II outputs a corresponding direct current voltage signal which is used as the input of a PWM drive generation module, and the PWM drive generation module outputs PWM drive signals with different duty ratios, and controls a switch tube in the DC chopping conversion module.
Claims (4)
1. A wireless photovoltaic power generation system based on an energy information composite modulation technology is characterized by comprising a main power forward path and an MPPT closed-loop control reverse path; the main power forward path is used for generating a low-frequency main power signal after the electric energy output by the photovoltaic module is subjected to direct current conversion, inversion and power amplification, transmitting the low-frequency main power signal to the electric energy receiving side in a wireless energy transmission mode, and transmitting the low-frequency main power signal to a load after rectification; the MPPT closed-loop control reverse path is used for calling an MPPT algorithm according to actual power transmitted to a load by a main power forward path, controlling a power amplifier and an inverter circuit on a receiving electric energy side to generate high-frequency carrier signals with different amplitudes, transmitting the high-frequency carrier signals to a transmitting electric energy side in a wireless energy transmission mode, demodulating and rectifying the high-frequency carrier signals into direct-current voltage signals, generating PWM driving pulses with different duty ratios according to the amplitudes of the direct-current voltage signals, controlling a switching tube in a direct-current chopping conversion module in the main power forward path, and realizing closed-loop control.
2. The wireless photovoltaic power generation system based on the energy information composite modulation technology as claimed in claim 1, wherein the frequency of the high-frequency carrier signal is in the order of MHz; the frequency of the low-frequency main power signal is 0.01-0.1 times of the frequency of the high-frequency carrier signal.
3. The wireless photovoltaic power generation system based on the energy information composite modulation technology as claimed in claim 1, wherein the main power forward path comprises the following modules: the device comprises a photovoltaic module, a direct current chopping conversion module, a power amplifier and inverter module I, a primary side compensation network module, a wireless energy transmission module, a secondary side compensation network module, a rectification module I and a load module;
the output port of the photovoltaic module is connected with the input port of the direct current chopping conversion module; the output port of the direct current chopping conversion module is connected with the input port of the power amplifier and inverter module I; the output port of the power amplifier and inverter module I is connected with the input port of the primary side compensation network module; the output port of the primary side compensation network module is connected with the primary side port of the mutual inductance coupling coil in the wireless energy transfer module; the secondary side port of the mutual inductance coupling coil in the wireless energy transfer module is connected with the input port of the secondary side compensation network module; the output port of the secondary side compensation network module is connected with the input port of the rectification module I; and the output port of the rectifying module I is connected with the input port of the load module.
4. The wireless photovoltaic power generation system based on the energy information composite modulation technology of claim 1, wherein the MPPT closed-loop control reverse path comprises an MPPT control module, a power amplifier and inverter module II, a primary side compensation network module, a wireless energy transfer module, a secondary side compensation network module, a demodulation module, a rectification module II, and a PWM drive generation module; the MPPT closed-loop control reverse path and the main power forward path share a primary side compensation network module, a wireless energy transfer module and a secondary side compensation network module;
the output port of the load module of the main power forward path is connected with the input port of the MPPT control module, the output port of the MPPT control module is connected with the input port of the power amplifier and inversion module II, and the output port of the power amplifier and inversion module II is connected with the input port of the secondary compensation network module; the output port of the secondary compensation network module is connected with the secondary port of the mutual inductance coupling coil in the wireless energy transmission module; a primary side port of a mutual inductance coupling coil in the wireless energy transfer module is connected with an input port of a primary side compensation network module; the output port of the primary side compensation network module is connected with the input port of the demodulation module; the output port of the demodulation module is connected with the input port of the rectification module II; the output port of the rectification module II is connected with the input port of the PWM drive generation module; and the output of the PWM driving generation module is used for driving a switching tube in the direct current chopping conversion module.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114825656A (en) * | 2022-04-06 | 2022-07-29 | 浙江大学 | Wireless power and data synchronous transmission system and data modulation method |
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| CN114243942B (en) | 2024-05-10 |
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