DC Power Line Communication Pairing for Crosstalk Noise
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Solution Overview
Problem
In photovoltaic power generation systems, crosstalk noise in DC power line communications leads to undesirable signal interference between components, making it challenging to control and monitor photovoltaic modules effectively, as existing methods like shielding and filtering are impractical or costly for DC power line communications.
Innovation Solution
A method and system that utilize a pairing mechanism with initial and control codes to validate signals between an inverter module and photovoltaic modules, employing transceivers to modulate and demodulate signals on the DC power line, and comparing signal strengths to prevent crosstalk, ensuring only valid control commands are acted upon, while limiting current output during initial mode operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shielding or twisted pair cables are used to prevent crosstalk, then signal transmission reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the communication function from the power cable by using the DC power line as a communication channel through PLC technology. This eliminates the need for separate communication cables or complex shielding structures, while still achieving reliable signal transmission by validating control commands through pairing codes and comparing signal strengths to filter out crosstalk interference
Solution Approach 2:
The DC power cable is made multi-functional by enabling it to carry both power transmission and communication functions simultaneously. The inverter and photovoltaic modules use the existing DC power lines for both powering and signaling, eliminating the need for additional communication infrastructure while maintaining reliability through signal validation mechanisms
2Reliability
If filtering techniques like de-coupling capacitors or chokes are used to prevent crosstalk, then signal quality is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the crosstalk mitigation function from physical filtering components and implements it through software-based signal validation. By using pairing codes stored in memory and comparing signal strengths, the system filters out invalid signals from crosstalk without requiring additional filtering hardware
Solution Approach 2:
The patent replaces physical filtering mechanisms (capacitors, chokes) with an electronic/software-based validation system. The inverter validates control commands by comparing received signals against stored pairing codes and analyzing signal strength characteristics, substituting mechanical filtering with intelligent signal processing
3Ease of operation
If PLC is used for communication over DC power lines, then ease of installation is improved, but susceptibility to crosstalk increases
Solution Approach 1:
The patent performs preliminary pairing between the inverter and photovoltaic modules during installation or initialization. The pairing code is stored in memory before normal operation begins, enabling the system to validate future control commands and reject crosstalk interference without requiring complex real-time filtering or additional installation steps
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively reduces crosstalk noise, ensuring accurate signal transmission and control in photovoltaic power generation systems by validating control commands and filtering out fluctuations, thereby maintaining reliable power conversion and monitoring.
Implementation Method 1
employing transceivers to modulate and demodulate signals on the DC power line
Implementation Method 2
employing transceivers to modulate and demodulate signals on the DC power line
Data Source
AI summary
A method of signaling between a photovoltaic module and an inverter module. The inverter module is connected to the photovoltaic module. In an initial mode of operation an initial code is modulated thereby producing an initial signal. The initial signal is transmitted from the inverter module to the photovoltaic module. The initial signal is received by the photovoltaic module. The operating mode is then changed to a normal mode of power conversion, and during the normal mode of operation a control signal is transmitted from the inverter to the photovoltaic module. A control code is demodulated and received from the control signal. The control code is compared with the initial code producing a comparison. The control command of the control signal is validated as a valid control command from the inverter module with the control command only acted upon when the comparison is a positive comparison.