CN114584182B - Power line communication circuit and method and photovoltaic power station communication system - Google Patents
Power line communication circuit and method and photovoltaic power station communication system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00007—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using the power network as support for the transmission
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/546—Combination of signalling, telemetering, protection
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
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- 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
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Abstract
A power line communication circuit, a method and a photovoltaic power station communication system are provided, wherein the power line communication circuit comprises: the crystal oscillation circuit is provided with an oscillation signal output end and is used for outputting an oscillation signal; the first logic gate device is provided with a first modulation input end, a second modulation input end and a modulation signal output end, the first modulation input end is connected with the oscillation signal output end, the second modulation input end is used for receiving a data signal sent by the photovoltaic power optimizer, and the first logic gate device is used for modulating the oscillation signal and the data signal and outputting the modulation signal through the modulation signal output end; the signal amplifying circuit is used for amplifying the modulation signal and transmitting the amplified modulation signal to the host monitoring end; and the signal receiving circuit is used for demodulating the request signal sent by the host monitoring end and transmitting the demodulated request signal to the photovoltaic power optimizer. The problems that the signal stability of power line communication is poor, the faults of the photovoltaic power optimizer cannot be accurately monitored, and the hardware cost is high are solved through the circuit.
Description
Technical Field
The invention belongs to the field of power line communication, and particularly relates to a power line communication circuit and method and a photovoltaic power station communication system.
Background
With the shortage of global energy, under the background of 'carbon peak reaching', 'carbon neutralization', clean energy transformation and green recovery become a trend, and the global photovoltaic market rapidly increases. The efficiency of monitoring energy conversion accords with the development trend of the current low-carbon era. At present, a Power Line (PLC) communication technology plays a very important role in the photovoltaic energy industry, the PLC communication technology is divided into a parallel communication mode and a series communication mode, the PLC parallel communication mode is mostly applied to an alternating current side of a photovoltaic power collection station, the PLC series communication technology is applied to a direct current side of a photovoltaic power optimizer, and the working state of each independent photovoltaic power component can be monitored.
In the current PLC serial communication technology, the independent monitoring of the photovoltaic power modules becomes more complicated due to the large power transmission at the photovoltaic power optimizer side and the loss of the communication signals by the transmission distance, so that it is difficult to accurately locate the faults in the photovoltaic power optimizer group strings, and the photovoltaic panels of these low-efficiency group strings cannot be effectively rectified and modified in time. The signal stability of the existing PLC serial communication is poor, the faults of the photovoltaic power optimizer cannot be accurately monitored, the cost of used hardware is high, and the standard of mass production cannot be achieved.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a power line communication circuit which solves the problems that the signal stability of power line communication is poor, the fault of a photovoltaic power optimizer cannot be accurately monitored, and the hardware cost is high.
The invention also provides a power line communication method and a photovoltaic power station communication system.
A power line communication circuit according to an embodiment of a first aspect of the present invention includes:
a crystal oscillation circuit having an oscillation signal output terminal for outputting an oscillation signal;
a first logic gate device having a first modulation input terminal, a second modulation input terminal and a modulation signal output terminal, the first modulation input terminal being connected to the oscillation signal output terminal, the second modulation input terminal being configured to receive a data signal transmitted by a photovoltaic power optimizer, the first logic gate device being configured to modulate the oscillation signal and the data signal and output a modulation signal through the modulation signal output terminal;
the signal amplifying circuit is used for amplifying the modulation signal and transmitting the amplified modulation signal to a host monitoring end;
and the signal receiving circuit is used for demodulating the request signal sent by the host monitoring end and transmitting the demodulated request signal to the photovoltaic power optimizer.
According to the power line communication circuit provided by the embodiment of the invention, at least the following technical effects are achieved: the signal receiving circuit can receive a request signal sent by the host monitoring end, the request signal is demodulated and transmitted to the photovoltaic power optimizer, then the first logic gate device receives a data signal sent by the photovoltaic power optimizer and an oscillation signal output by the crystal oscillation circuit, the data signal and the oscillation signal are modulated by the first logic gate device, and the modulation signal is amplified by the signal amplification circuit and transmitted to the host monitoring end, so that data communication between the host monitoring end and the photovoltaic power optimizer can be realized, meanwhile, the signal stability of power line communication is achieved, the requirement of low hardware cost is met, and the problems that the signal stability of the power line communication is poor, the fault of the photovoltaic power optimizer cannot be accurately monitored, and the hardware cost is high are solved.
According to some embodiments of the invention, the crystal oscillation circuit comprises:
a second logic gate device having a first input terminal, a second input terminal, and an oscillation output terminal;
one end of the crystal oscillator is connected with the second input end, and the other end of the crystal oscillator is connected with the oscillation output end;
and one end of the first feedback resistor is connected with the first input end, and the other end of the first feedback resistor is connected with the oscillation output end.
According to some embodiments of the invention, the crystal oscillation circuit further comprises:
one end of the first filter resistor is connected with the oscillation output end, and the other end of the first filter resistor is connected with the other end of the crystal oscillator;
and one end of the first filter capacitor is connected with the other end of the first filter resistor, and the other end of the first filter capacitor is connected with a ground wire.
According to some embodiments of the invention, the signal receiving circuit comprises:
the frequency selection circuit is used for selecting a frequency selection signal of which the frequency corresponds to the crystal oscillator in the request signal;
the frequency-selecting signal amplifying circuit is used for outputting an amplified frequency-selecting signal obtained by amplifying the frequency-selecting signal;
and the signal demodulation circuit is used for receiving the amplified frequency-selective signal, demodulating the amplified frequency-selective signal and sending the demodulated frequency-selective signal to the photovoltaic power optimizer.
According to some embodiments of the invention, the frequency selective signal amplifying circuit comprises:
a third logic gate device having a third input terminal, a fourth input terminal, and an amplified signal output terminal;
a first amplification gain adjustment resistor, one end of which is connected to the frequency selection circuit and the other end of which is connected to the third input terminal and the fourth input terminal, respectively;
a second amplification gain adjustment resistor, one end of which is connected to the third input terminal;
one end of the second filter resistor is connected with the amplified signal output end, and the other end of the second filter resistor is connected with the other end of the second amplification gain adjusting resistor;
and one end of the second filter capacitor is connected with the other end of the second filter resistor, and the other end of the second filter capacitor is connected with a ground wire.
According to some embodiments of the invention, the signal demodulation circuit comprises:
a fourth logic gate device having a fifth input terminal, a sixth input terminal, and a demodulated signal output terminal, both the fifth input terminal and the sixth input terminal being connected to the other end of the second filter resistor;
and the input end of the protection circuit is connected with the output end of the demodulation signal, and the output end of the protection circuit is used for outputting the demodulated amplified frequency-selective signal.
According to some embodiments of the invention, the protection circuit comprises:
the cathode of the diode is connected with the demodulation signal output end, and the anode of the diode is used for outputting the demodulated amplified frequency-selective signal;
one end of the first resistor is connected with a power supply, and the other end of the first resistor is connected with the anode of the diode;
and one end of the first capacitor is connected with the anode of the diode, and the other end of the first capacitor is connected with the ground wire.
The power line communication method according to the second aspect of the present invention is applied to the power line communication circuit according to the first aspect, and includes:
modulation strategy: the crystal oscillation circuit outputs the oscillation signal to the first modulation input of the first logic gate device; the second modulation input end of the first logic gate device receives the data signal sent by the photovoltaic power optimizer, and modulates the oscillation signal and the data signal through the first logic gate device to output the modulation signal; amplifying the modulation signal by the signal amplifying circuit and transmitting the amplified modulation signal to the host monitoring end;
demodulation strategy: and receiving the request signal sent by the host monitoring terminal, demodulating the request signal and sending the demodulated request signal to the photovoltaic power optimizer.
The power line communication method provided by the embodiment of the invention at least has the following technical effects: the crystal oscillation circuit outputs an oscillation signal to a first modulation input end of the first logic gate device, a second modulation input end of the first logic gate device receives a data signal sent by the photovoltaic power optimizer, the oscillation signal and the data signal can be modulated by the first logic gate device and then output a modulation signal, and then the modulation signal can be amplified by the signal amplification circuit and then transmitted to a host monitoring end, so that a modulation strategy is realized; conversely, the data communication between the host monitoring end and the photovoltaic power optimizer can be finally realized by receiving the request signal sent by the host monitoring end and sending the demodulated request signal to the photovoltaic power optimizer, the signal of the power line communication is stable, the hardware cost is low, and the problems that the signal stability of the power line communication is poor, the fault of the photovoltaic power optimizer cannot be accurately monitored, and the hardware cost is high are solved.
According to some embodiments of the present invention, the signal receiving circuit includes a frequency selecting circuit, a frequency selecting signal amplifying circuit, a signal demodulating circuit; the frequency-selective signal amplification circuit comprises a third logic gate device with a third input end, a fourth input end and an amplified signal output end; the signal demodulation circuit comprises a fourth logic gate device with a fifth input terminal, a sixth input terminal and a demodulated signal output terminal;
the receiving and demodulating of the request signal sent by the host monitoring terminal and the sending of the demodulated request signal to the photovoltaic power optimizer includes the following steps:
the frequency selection circuit receives and selects a frequency selection signal with a frequency corresponding to the oscillation signal in the request signal sent by the host monitoring terminal, and outputs the frequency selection signal to the third input end and the fourth input end of the third logic gate device; and the frequency-selective signal is amplified by the third logic gate device and then output to the fifth input end and the sixth input end of the fourth logic gate device, and the amplified frequency-selective signal is demodulated by the fourth logic gate device and then sent to the photovoltaic power optimizer.
According to a third aspect of the present invention, a photovoltaic power station communication system is applied to the power line communication circuit described in the first aspect, and the photovoltaic power station communication system includes:
a plurality of the power line communication circuits, which are connected in series in sequence;
the photovoltaic power optimizers are arranged in a one-to-one correspondence mode;
and the host monitoring end is used for carrying out data communication with the photovoltaic power optimizers through the power line communication circuits.
The photovoltaic power station communication system provided by the embodiment of the invention at least has the following technical effects: the plurality of power line communication circuits and the plurality of photovoltaic power optimizers are arranged in a one-to-one correspondence mode, and therefore each photovoltaic power optimizer can be monitored independently. The host monitoring terminal sends a request signal to a plurality of power line communication circuits which are sequentially connected in series, and then the request signal is respectively sent to corresponding photovoltaic power optimizers after being processed by the plurality of power line communication circuits; the photovoltaic power optimizers can transmit data information to corresponding power line communication circuits respectively, then the data information is subjected to signal processing through the power line communication circuits which are sequentially connected in series and then is sent to the host monitoring end, data communication between the host monitoring end and the photovoltaic power optimizers is achieved, each photovoltaic power optimizer can be independently monitored, signals of the power line communication are stable, faults occurring to the photovoltaic power optimizers can be accurately monitored, the cost of adopted hardware is low, and monitoring requirements for the photovoltaic power optimizers can be met.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is an electrical schematic diagram of a power line communication circuit of an embodiment of the present invention;
FIG. 2 is an electrical schematic diagram of a signal receiving circuit of an embodiment of the present invention;
fig. 3 is a block diagram of a photovoltaic power station communication system according to an embodiment of the present invention.
Reference numerals:
a crystal oscillation circuit 100;
a first logic gate device 200;
a signal amplification circuit 300;
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the directional descriptions, such as the directions of upper, lower, front, rear, left, right, etc., are referred to only for convenience of describing the present invention and for simplicity of description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
A power line communication circuit according to an embodiment of the first aspect of the present invention is described below with reference to fig. 1 to 3.
According to the power line communication circuit of the embodiment of the invention, the power line communication circuit comprises: the circuit includes a crystal oscillation circuit 100, a first logic gate device 200, a signal amplification circuit 300, and a signal reception circuit 400. A crystal oscillation circuit 100 having an oscillation signal output terminal for outputting an oscillation signal; a first logic gate device 200 having a first modulation input connected to the oscillation signal output, a second modulation input for receiving the data signal sent by the photovoltaic power optimizer, and a modulation signal output, the first logic gate device 200 being configured to modulate the oscillation signal and the data signal and output the modulation signal through the modulation signal output; the signal amplification circuit 300 is used for amplifying the modulation signal and transmitting the amplified modulation signal to a host monitoring end; and the signal receiving circuit 400 is configured to demodulate the request signal sent by the host monitoring end and transmit the demodulated request signal to the photovoltaic power optimizer.
The signal receiving circuit 400 receives the request signal sent by the host monitoring terminal, demodulates the request signal and transmits the demodulated request signal to the photovoltaic power optimizer to request monitoring of the state of the photovoltaic power optimizer. The crystal oscillation circuit 100 generates an oscillation signal with a fixed frequency and inputs the oscillation signal to a first modulation input end of the first logic gate device 200, a second modulation input end of the first logic gate device 200 receives a data signal sent by the photovoltaic power optimizer, the first logic gate device 200 performs carrier signal modulation on the oscillation signal and the data signal and outputs a modulation signal, and then the power of the modulation signal is amplified by the signal amplification circuit 300 and transmitted to a host monitoring end, so that the photovoltaic power optimizer is monitored in real time, and possible faults of the photovoltaic power optimizer can be accurately monitored. Specifically, the data signal includes the operating status information of the photovoltaic power optimizer and the collected parameter data, which is sent to the first logic gate device 200 in the form of a data carrier.
The first logic gate device 200 is adopted for signal modulation, so that the power consumption is low, the anti-interference capability is high, the cost is low, the requirement of power line communication can be met, and the purpose of mass production is achieved. The signal stability of the existing power line serial communication is poor, the cost of the adopted hardware is high, and the standard of market application and mass production is difficult to achieve.
In addition, it should be noted that the processes of signal modulation, signal demodulation, oscillation, signal amplification, and the like in the present invention are known to those skilled in the art, and the detailed working principle is not described herein.
According to the power line communication circuit of the embodiment of the present invention, the request signal transmitted from the host monitor can be received by the signal receiving circuit 400, and is transmitted to the photovoltaic power optimizer after being demodulated, and then, the first logic gate device 200 receives the data signal sent by the photovoltaic power optimizer and the oscillation signal output by the crystal oscillation circuit 100, and modulates the data signal and the oscillation signal through the first logic gate device 200, then the modulated signal is amplified by the signal amplifying circuit 300 and transmitted to the monitoring end of the host, thereby realizing data communication between the host monitoring terminal and the photovoltaic power optimizer, achieving stable signals of power line communication, and the problem that the signal stability of power line communication is poor, the fault of the photovoltaic power optimizer cannot be accurately monitored, and the hardware cost is high is solved.
In some embodiments of the present invention, referring to fig. 1, a crystal oscillation circuit 100 includes: a second logic gate device U1, a crystal oscillator X1, and a first feedback resistor R1. A second logic gate device U1 having a first input terminal, a second input terminal, and an oscillation output terminal; a crystal oscillator X1, one end of which is connected to the second input terminal and the other end of which is connected to the oscillation output terminal; and one end of the first feedback resistor R1 is connected with the first input end, and the other end is connected with the oscillation output end. The crystal oscillator X1 is a 455K ceramic crystal oscillator, the crystal oscillator X1 and the second logic gate device U1 generate an oscillation signal with a frequency of 455KHz, and the first feedback resistor R1 is used for providing direct current feedback. The second logic gate device U1 and the crystal oscillator X1 are adopted to generate oscillation signals, so that the power consumption is low, the circuit structure is simple, and the device cost is low. It should be noted that the model of the crystal oscillator X1 used in the embodiment of the present invention is not to be considered as a limitation of the present invention, and therefore, the frequency of the oscillation signal is not limited to 455 KHz. The crystal oscillation circuit 100 may have a circuit configuration including a logic gate device and other components, and is not to be construed as limiting the present invention.
In some embodiments of the present invention, referring to fig. 1, the crystal oscillation circuit 100 further includes: a first filter resistor R2 and a first filter capacitor C2. One end of the first filter resistor R2 is connected with the oscillation output end, and the other end of the first filter resistor R2 is connected with the other end of the crystal oscillator X1; and one end of the first filter capacitor C2 is connected with the other end of the first filter resistor R2, and the other end is used for being connected with a ground wire. The first filter resistor R2 and the first filter capacitor C2 form a low-pass filter circuit, which can limit the bandwidth of the oscillation signal to 455 KHz.
In some embodiments of the present invention, referring to fig. 2, signal receiving circuit 400 includes: frequency selecting circuit 410, frequency selecting signal amplifying circuit 420, and signal demodulating circuit 430. A frequency selection circuit 410, configured to select a frequency selection signal having a frequency corresponding to the crystal oscillator X1 from the request signal; a frequency-selective signal amplifying circuit 420, configured to output an amplified frequency-selective signal obtained by amplifying the frequency-selective signal; and the signal demodulation circuit 430 is configured to receive the amplified frequency-selective signal, demodulate the amplified frequency-selective signal, and send the demodulated frequency-selective signal to the photovoltaic power optimizer. The frequency selection circuit 410 selects the frequency selection signal with the frequency of 455KHz in the request signal as a useful signal, and then sends the frequency selection signal to the frequency selection signal amplification circuit 420 for amplification, and the useful signal is demodulated by the signal demodulation circuit 430 and then output to the photovoltaic power optimizer, so that the photovoltaic power optimizer receives the instruction data of the host monitoring end.
In some embodiments of the present invention, referring to fig. 2, the frequency-selective signal amplifying circuit 420 includes: the third logic gate device U3, the first amplification gain adjustment resistor R6, the second amplification gain adjustment resistor R7, the second filter resistor R8, and the second filter capacitor C4. A third logic gate device U3 having a third input terminal, a fourth input terminal, and an amplified signal output terminal; a first amplification gain adjustment resistor R6, one end of which is connected to the frequency selection circuit 410 and the other end of which is connected to the third input terminal and the fourth input terminal, respectively; a second amplification gain adjustment resistor R7, one end of which is connected to the third input terminal; a second filter resistor R8, one end of which is connected to the amplified signal output terminal and the other end of which is connected to the other end of the second amplification gain adjustment resistor R7; and one end of the second filter capacitor C4 is connected with the other end of the second filter resistor R8, and the other end is connected with the ground wire. The first amplification gain adjusting resistor R6 and the second amplification gain adjusting resistor R7 are both used for adjusting the amplification gain of signals, the second filter resistor R8 and the second filter capacitor C4 form a low-pass filter circuit to prevent the signals from generating self-oscillation, and a third logic gate device U3 is adopted to amplify frequency-selecting signals, so that the power consumption is low, the circuit structure is simple, and the device cost is low. It should be noted that the frequency-selecting signal amplifying circuit 420 may also be a circuit structure formed by using a logic gate device and other components, and is not to be considered as a limitation of the present invention.
In some embodiments of the present invention, referring to fig. 2, signal demodulation circuit 430 includes: a fourth logic gate device U4, a protection circuit. A fourth logic gate device U4 having a fifth input terminal, a sixth input terminal and a demodulated signal output terminal, the fifth input terminal and the sixth input terminal being connected to the other end of the second filter resistor R8; and the input end of the protection circuit is connected with the output end of the demodulation signal, and the output end of the protection circuit is used for outputting the demodulated amplified frequency-selective signal. The fourth logic gate device U4 is adopted to demodulate the amplified frequency-selecting signal output by the frequency-selecting signal amplifying circuit 420, so that the power consumption is low, the circuit structure is simple, and the device cost is low.
In some embodiments of the present invention, referring to fig. 2, the protection circuit includes: diode D1, first resistance R9, first electric capacity C5. A diode D1, the cathode of which is connected with the output end of the demodulation signal, and the anode of which is used for outputting the demodulated amplified frequency selection signal; a first resistor R9, one end of which is connected to a power supply and the other end of which is connected to the anode of the diode D1; the first capacitor C5 has one end connected to the anode of the diode D1 and the other end connected to ground. The diode D1 is reversely connected to the demodulated signal output terminal of the fourth logic gate device U4, and may perform an overvoltage protection function, and it should be noted that a specific circuit structure of the protection circuit is not to be considered as a limitation of the present invention.
In some embodiments of the present invention, referring to fig. 1 and 2, the first logic gate device 200, the second logic gate device U1, the third logic gate device U3, and the fourth logic gate device U4 all employ nor gate devices. When the invention is applied to the side of the photovoltaic power optimizer, a nor gate device can be adopted, which is characterized in that any input is a high level and the output is a low level, and the specific application process is the prior art known by those skilled in the art and is not described herein. The invention can also be used for monitoring the energy storage condition of the solar cell, and the first logic gate device 200, the second logic gate device U1, the third logic gate device U3 and the fourth logic gate device U4 may be exclusive nor gate devices, but it should be noted that the specific circuit structure thereof should not be construed as a limitation to the invention.
A power line communication method according to an embodiment of the second aspect of the present invention is described below with reference to fig. 1 to 3.
The power line communication method according to the embodiment of the invention comprises the following steps:
modulation strategy: the crystal oscillation circuit 100 outputs an oscillation signal to a first modulation input terminal of the first logic gate device 200; a second modulation input end of the first logic gate device 200 receives the data signal sent by the photovoltaic power optimizer, and modulates the oscillation signal and the data signal through the first logic gate device 200 to output a modulation signal; the modulation signal is amplified by the signal amplifying circuit 300 and then transmitted to a host monitoring end;
demodulation strategy: and receiving a request signal sent by a host monitoring end, demodulating the request signal and sending the demodulated request signal to the photovoltaic power optimizer.
The signal receiving circuit 400 receives and demodulates the request signal sent by the host monitoring terminal, and then sends the demodulated request signal to the photovoltaic power optimizer to request monitoring of the state of the photovoltaic power optimizer. The crystal oscillation circuit 100 generates an oscillation signal with a fixed frequency and outputs the oscillation signal to a first modulation input end of the first logic gate device 200, a second modulation input end of the first logic gate device 200 receives a data signal sent by the photovoltaic power optimizer, the first logic gate device 200 performs carrier signal modulation on the oscillation signal and the data signal and outputs a modulation signal, and the signal amplification circuit 300 amplifies the power of the modulation signal and transmits the amplified power to a host monitoring end, so that the photovoltaic power optimizer is monitored in real time, and possible faults of the photovoltaic power optimizer can be accurately monitored.
According to the power line communication method of the embodiment of the invention, the crystal oscillation circuit 100 outputs an oscillation signal to the first modulation input end of the first logic gate device 200, the second modulation input end of the first logic gate device 200 receives a data signal sent by the photovoltaic power optimizer, the oscillation signal and the data signal can be modulated by the first logic gate device 200 and then output a modulation signal, and then the modulation signal can be amplified by the signal amplification circuit 300 and then transmitted to the host monitoring end, so that a modulation strategy is realized; conversely, the data communication between the host monitoring end and the photovoltaic power optimizer can be finally realized by receiving the request signal sent by the host monitoring end and sending the demodulated request signal to the photovoltaic power optimizer, the signal of the power line communication is stable, the hardware cost is low, and the problems that the signal stability of the power line communication is poor, the fault of the photovoltaic power optimizer cannot be accurately monitored, and the hardware cost is high are solved.
In some embodiments of the present invention, referring to fig. 2, the signal receiving circuit 400 includes a frequency selecting circuit 410, a frequency selecting signal amplifying circuit 420, and a signal demodulating circuit 430; the frequency selective signal amplification circuit 420 comprises a third logic gate device having a third input terminal, a fourth input terminal, and an amplified signal output terminal; signal demodulation circuit 430 comprises a fourth logic gate device having a fifth input terminal, a sixth input terminal, and a demodulated signal output terminal;
the method comprises the following steps of receiving a request signal sent by a host monitoring end, demodulating the request signal and sending the demodulated request signal to a photovoltaic power optimizer, wherein the method comprises the following steps:
the frequency selection circuit 410 receives and selects a frequency selection signal with a frequency corresponding to the oscillation signal in the request signal sent by the host monitoring terminal, and outputs the frequency selection signal to a third input end and a fourth input end of the third logic gate device; and the frequency-selecting signal is amplified by the third logic gate device, then the amplified frequency-selecting signal is output to a fifth input end and a sixth input end of the fourth logic gate device, and the amplified frequency-selecting signal is demodulated by the fourth logic gate device and then is sent to the photovoltaic power optimizer.
The frequency selection circuit 410 selects a frequency selection signal with a frequency of 455KHz in the request signal as a useful signal, then sends the frequency selection signal to the third logic gate device for amplification, and transmits the frequency selection signal to the fourth logic gate device to demodulate the useful signal and output the useful signal to the photovoltaic power optimizer, so that the photovoltaic power optimizer receives instruction data of the host monitoring end to request for monitoring the state of the photovoltaic power optimizer. And the third logic gate device is adopted for signal amplification, and the fourth logic gate device is adopted for signal demodulation, so that the power consumption is low, the circuit structure is simple, and the device cost is low.
A photovoltaic power plant communication system according to an embodiment of the third aspect of the present invention is described below with reference to fig. 1 to 3.
The photovoltaic power station communication system according to the embodiment of the invention comprises: a plurality of power line communication circuits connected in series in sequence; the power line communication circuits and the photovoltaic power optimizers are arranged in a one-to-one correspondence manner; and the host monitoring terminal is used for carrying out data communication with the photovoltaic power optimizers through the power line communication circuits.
The plurality of power line communication circuits and the plurality of photovoltaic power optimizers are arranged in a one-to-one correspondence mode, and therefore each photovoltaic power optimizer is monitored independently. The host monitoring terminal sends a request signal to a plurality of power line communication circuits which are sequentially connected in series, and then the request signal is processed by the plurality of power line communication circuits and then respectively sent to the corresponding photovoltaic power optimizers. The data information of the photovoltaic power optimizers is transmitted to the corresponding power line communication circuits respectively, and then the data information is subjected to signal processing through the plurality of power line communication circuits which are sequentially connected in series and then is transmitted to the host monitoring end, so that data communication between the host monitoring end and the photovoltaic power optimizers is achieved. The data signals comprise the working state information of the photovoltaic power optimizers and the collected parameter data, the data signals are sent to the power line communication circuit in a data carrier mode, each photovoltaic power optimizer is independently monitored, and faults of the photovoltaic power optimizers can be accurately monitored.
According to the photovoltaic power station communication system, the host monitoring end sends request signals to the plurality of power line communication circuits which are sequentially connected in series, and the request signals are processed by the plurality of power line communication circuits and then respectively sent to the corresponding photovoltaic power optimizers so as to request to monitor the plurality of photovoltaic power optimizers; the photovoltaic power optimizers transmit data information to the corresponding power line communication circuits respectively, then the data information is subjected to signal processing through the plurality of power line communication circuits which are sequentially connected in series and then is sent to the host monitoring end, data communication between the host monitoring end and the photovoltaic power optimizers can be achieved, each photovoltaic power optimizer is independently monitored, signals of power line communication are stable, faults of the photovoltaic power optimizers can be accurately monitored, the hardware cost is low, and monitoring requirements for the photovoltaic power optimizers can be met.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to the embodiments, and those skilled in the art will understand that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A power line communication circuit, comprising:
the crystal oscillation circuit is provided with an oscillation signal output end and is used for outputting an oscillation signal;
a first logic gate device having a first modulation input terminal, a second modulation input terminal and a modulation signal output terminal, the first modulation input terminal being connected to the oscillation signal output terminal, the second modulation input terminal being configured to receive a data signal transmitted by a photovoltaic power optimizer, the first logic gate device being configured to modulate the oscillation signal and the data signal and output a modulation signal through the modulation signal output terminal;
the signal amplifying circuit is used for amplifying the modulation signal and transmitting the amplified modulation signal to a host monitoring end;
and the signal receiving circuit is used for demodulating the request signal sent by the host monitoring end and transmitting the demodulated request signal to the photovoltaic power optimizer.
2. The power-line communication circuit according to claim 1, wherein the crystal oscillation circuit comprises:
a second logic gate device having a first input terminal, a second input terminal, and an oscillation output terminal;
one end of the crystal oscillator is connected with the second input end, and the other end of the crystal oscillator is connected with the oscillation output end;
and one end of the first feedback resistor is connected with the first input end, and the other end of the first feedback resistor is connected with the oscillation output end.
3. The power-line communication circuit according to claim 2, wherein the crystal oscillation circuit further comprises:
a first filter resistor, one end of which is connected to the oscillation output terminal and the other end of which is connected to the other end of the crystal oscillator;
and one end of the first filter capacitor is connected with the other end of the first filter resistor, and the other end of the first filter capacitor is connected with a ground wire.
4. The power-line communication circuit according to claim 2, wherein the signal receiving circuit comprises:
the frequency selection circuit is used for selecting a frequency selection signal of the request signal, the frequency of which corresponds to the crystal oscillator;
the frequency-selecting signal amplifying circuit is used for outputting an amplified frequency-selecting signal obtained by amplifying the frequency-selecting signal;
and the signal demodulation circuit is used for receiving the amplified frequency-selective signal, demodulating the amplified frequency-selective signal and sending the demodulated frequency-selective signal to the photovoltaic power optimizer.
5. The power-line communication circuit according to claim 4, wherein the frequency-selective signal amplifying circuit includes:
a third logic gate device having a third input terminal, a fourth input terminal, and an amplified signal output terminal;
a first amplification gain adjustment resistor, one end of which is connected to the frequency selection circuit and the other end of which is connected to the third input terminal and the fourth input terminal, respectively;
a second amplification gain adjustment resistor, one end of which is connected to the third input terminal;
one end of the second filter resistor is connected with the amplified signal output end, and the other end of the second filter resistor is connected with the other end of the second amplification gain adjusting resistor;
and one end of the second filter capacitor is connected with the other end of the second filter resistor, and the other end of the second filter capacitor is connected with a ground wire.
6. The power-line communication circuit according to claim 5, wherein the signal demodulation circuit includes:
a fourth logic gate device having a fifth input terminal, a sixth input terminal, and a demodulated signal output terminal, both the fifth input terminal and the sixth input terminal being connected to the other end of the second filter resistor;
and the input end of the protection circuit is connected with the demodulation signal output end, and the output end of the protection circuit is used for outputting the demodulated amplified frequency-selective signal.
7. The power-line communication circuit according to claim 6, wherein the protection circuit comprises:
the cathode of the diode is connected with the demodulation signal output end, and the anode of the diode is used for outputting the demodulated amplified frequency-selective signal;
a first resistor, one end of which is used for connecting a power supply and the other end of which is connected with the anode of the diode;
and one end of the first capacitor is connected with the anode of the diode, and the other end of the first capacitor is connected with the ground wire.
8. A power line communication method applied to the power line communication circuit according to any one of claims 1 to 7, comprising the steps of:
modulation strategy: the crystal oscillation circuit outputs the oscillation signal to the first modulation input of the first logic gate device; the second modulation input end of the first logic gate device receives the data signal sent by the photovoltaic power optimizer, and modulates the oscillation signal and the data signal through the first logic gate device to output the modulation signal; amplifying the modulation signal by the signal amplification circuit and transmitting the amplified modulation signal to the host monitoring end;
demodulation strategy: and receiving the request signal sent by the host monitoring terminal, demodulating the request signal and sending the demodulated request signal to the photovoltaic power optimizer.
9. The power-line communication method according to claim 8, wherein the signal receiving circuit includes a frequency selecting circuit, a frequency selecting signal amplifying circuit, a signal demodulating circuit; the frequency-selective signal amplification circuit comprises a third logic gate device with a third input end, a fourth input end and an amplified signal output end; the signal demodulation circuit comprises a fourth logic gate device with a fifth input terminal, a sixth input terminal and a demodulated signal output terminal;
the receiving and demodulating of the request signal sent by the host monitoring terminal and the sending of the demodulated request signal to the photovoltaic power optimizer includes the following steps:
the frequency selection circuit receives and selects a frequency selection signal with a frequency corresponding to the oscillation signal in the request signal sent by the host monitoring terminal, and outputs the frequency selection signal to the third input end and the fourth input end of the third logic gate device; and the frequency-selective signal is amplified by the third logic gate device and then output to the fifth input end and the sixth input end of the fourth logic gate device, and the amplified frequency-selective signal is demodulated by the fourth logic gate device and then sent to the photovoltaic power optimizer.
10. A photovoltaic power station communication system applied to the power line communication circuit according to any one of claims 1 to 7, the photovoltaic power station communication system comprising:
a plurality of the power line communication circuits connected in series in sequence;
the power line communication circuits and the photovoltaic power optimizers are arranged in a one-to-one correspondence mode;
and the host monitoring end is used for carrying out data communication with the photovoltaic power optimizers through the power line communication circuits.
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