Photovoltaic Module Master-Slave Phase Synchronization
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Solution Overview
Problem
Existing photovoltaic systems face challenges in ensuring the phase and amplitude of alternating current (AC) power output from multiple photovoltaic modules are equal, leading to unstable AC power supply.
Innovation Solution
A photovoltaic module and system design that includes a solar cell module, a converter unit, an inverter unit, a communication unit, and a controller, where one module is set as a master to output phase and amplitude information, allowing other modules to adjust their output to match, eliminating the need for external control devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple photovoltaic modules are connected in parallel to output AC power, then the power output capacity is increased, but the phase and amplitude of AC power from different modules may differ causing unstable output
Solution Approach 1:
The patent applies equipotentiality by making all photovoltaic modules operate at the same reference phase and amplitude. A master module establishes reference values for phase and amplitude, and slave modules adjust their output parameters to match these references, ensuring all modules operate at equipotential conditions for stable parallel AC power output.
Solution Approach 2:
The patent implements feedback control where slave modules continuously monitor their own phase and amplitude parameters, compare them against reference values from the master module, and automatically adjust their output. This closed-loop feedback mechanism ensures phase and amplitude synchronization across all parallel-connected modules, resolving the stability issue while maintaining increased power capacity.
2Reliability
If a master-slave control system is implemented among photovoltaic modules, then phase and amplitude synchronization is achieved, but the system complexity increases due to communication and control requirements
Solution Approach 1:
The patent merges the control functionality directly into each photovoltaic module's existing inverter unit. The communication unit and controller are integrated within the module structure itself, allowing modules to exchange control information and perform self-adjustment without requiring external control devices. This merging approach achieves synchronization while minimizing additional system complexity.
Solution Approach 2:
The patent enables photovoltaic modules to perform self-service control where each module (as slave) autonomously adjusts its own phase and amplitude parameters based on feedback from the master module. This self-adjustment capability eliminates the need for complex external control systems and reduces overall system complexity while maintaining reliable synchronization.
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
This solution ensures equal phase and amplitude of AC power output from multiple photovoltaic modules, providing stable AC power supply without external control, suitable for connecting home appliances directly to the system.
Implementation Method 1
solar cells, which directly convert solar energy into electrical energy by using a semiconductor device
Implementation Method 2
an inverter unit to convert the DC power into alternating current (AC) power
Data Source
AI summary
A photovoltaic module and a photovoltaic system including the same are disclosed. The photovoltaic module includes a solar cell module, a converter unit to convert levels of direct current (DC) power from the solar cell module, an inverter unit to convert the DC power into alternating current (AC) power, a cable electrically connected to the inverter unit and to output the AC power to an outside, a communication unit to exchange data with another photovoltaic module, and a controller to control outputting of at least one of phase information and amplitude information of the photovoltaic module for adjusting at least one of a phase and an amplitude of the another photovoltaic module, when the photovoltaic module is set as a master. Consequently, the phase and/or the amplitude of AC power output from another photovoltaic module may be adjusted to be equal.