Photovoltaic Intelligent Power Supply MPPT Arc PID Control
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Solution Overview
Problem
Traditional photovoltaic power generation systems face issues with power mismatch due to factors like shading and temperature inconsistencies, and high costs associated with MPPT control and PID protection, which affect the reliability and efficiency of energy conversion.
Innovation Solution
A photovoltaic intelligent power supply with modular units including input collection, data acquisition, boost, arc isolation, and anti-PID functions, utilizing a communication and control unit to manage MPPT, detect arcs, and inhibit PID effects, thereby enhancing system reliability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If string-type inverters with boost modules and inverter modules are used for MPPT control, then MPPT control within wide input range is achieved, but device complexity and cost increase
Solution Approach 1:
The patent combines the boost converter and inverter functions into a single integrated module, eliminating the need for separate string-type inverters. This integration reduces wiring complexity while maintaining MPPT control capability across wide input ranges, directly resolving the contradiction between adaptability and device complexity
Solution Approach 2:
The intelligent power supply module performs multiple functions including MPPT control, arc detection, PID effect inhibition, and voltage regulation within a single device. This multi-functionality eliminates the need for separate devices for each function, reducing overall system complexity while maintaining broad adaptability
2Reliability
If individual devices are added for DC arc protection and PID effect inhibition, then protection functions are achieved, but cost increases
Solution Approach 1:
The patent integrates DC arc detection and PID effect inhibition functions into the intelligent power supply module, eliminating the need for separate protection devices. The arc detection circuit and PID control circuit are incorporated within the same module that performs MPPT and voltage regulation, reducing device quantity while maintaining comprehensive protection
Solution Approach 2:
The intelligent power supply module is designed as a multi-functional device that simultaneously performs power optimization, arc detection, PID effect inhibition, and voltage regulation. This universal design achieves multiple protection and control functions without requiring additional individual devices, directly addressing the contradiction between reliability and device complexity
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
The solution effectively widens the input voltage and MPPT ranges, ensures normal inverter operation, and reduces photovoltaic cell degradation, improving energy generation efficiency by integrating arc detection and PID inhibition.
Implementation Method 1
In normal operating condition, U-I and P-I characteristic curves of a photovoltaic cell may vary with irradiation and temperature
Implementation Method 2
the boost unit is configured to perform interleaving chopping and operate in an MPPT mode
Data Source
AI summary
A photovoltaic intelligent power supply, comprising a plurality of unit modules, and a communication unit (103) and a control unit (106), wherein all the unit modules are connected to the control unit (106) and the communication unit (103); each unit module comprises an input collection unit (101), a data acquisition unit (102), a boost unit (104), an arc isolation unit (105) and an anti-PID unit (107), wherein the input collection unit (101) is connected to a photovoltaic module; the data acquisition unit (102) is configured to acquire voltage and current state signals; the boost unit (104) is configured to perform interleaving chopping and operate in an MPPT mode; the arc isolation unit (105) is configured to receive instructions sent by the control unit (106) to execute opening and closing; and the anti-PID unit (107) is configured to receive instructions sent by the control unit (106) so as to generate proper DC voltages to be applied between a negative electrode of a cell panel and the ground. The photovoltaic intelligent power supply supports MPPT control, and can effectively detect an arc and start protection, can ensure normal operation of an inverter, and improve reliability of a power generation system.