Photovoltaic Power Regulator Droop Control for Uneven Strings
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Solution Overview
Problem
Photovoltaic power systems face challenges in balancing power production among multiple power sources due to uneven configuration and voltage drops across wires, leading to inefficient energy distribution and potential overheating, which can result in reduced lifespan and increased failure rates of power regulators.
Innovation Solution
A system comprising power regulators with input and output terminals, a power converter, a regulator communications module, and a regulator controller that receives regulation signals to adjust operational characteristics, such as output voltage and current, to balance power production across multiple power sources, using droop curve techniques to reduce differences in operational characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If power sources are connected in parallel strings with varying configurations, then system capacity is increased, but uneven power distribution and voltage drops occur
Solution Approach 1:
The patent applies local quality by configuring different numbers of power sources in different strings (e.g., first string with 3 power sources, second string with 2 power sources) to compensate for varying wire lengths and voltage drops. Each string is locally optimized based on its specific characteristics, allowing the overall system to achieve balanced power distribution despite heterogeneous configurations.
2Adaptability or versatility
If wire lengths between power sources and central module vary, then installation flexibility is improved, but voltage drops and power distribution unevenness increase
Solution Approach 1:
The patent compensates for varying wire lengths by adjusting the number of power sources in each string locally. Strings with longer wires have fewer power sources configured, while strings with shorter wires have more power sources, thereby balancing the voltage drops and power distribution across all strings despite different installation configurations.
Solution Approach 2:
The patent changes the operational parameters by configuring different numbers of power sources in different strings based on their specific wire length characteristics. This parameter adjustment allows the system to compensate for voltage drops caused by varying wire lengths and achieve uniform power distribution.
3Device complexity
If power regulators operate without individual control, then device complexity is reduced, but overheating and failure rates increase
Solution Approach 1:
The patent segments the power regulator control into individual units, with each power regulator equipped with its own controller that independently monitors and adjusts its operation. This segmentation allows each regulator to operate within safe parameters, preventing overheating and extending lifespan, while the overall control architecture remains relatively simple.
4Productivity
If all power sources produce maximum power, then energy production is maximized, but power distribution unevenness and overheating occur
Solution Approach 1:
The patent implements dynamic control where each power regulator's controller continuously monitors operational parameters and adjusts power output in real-time. This dynamic adjustment ensures that power sources operate at optimal levels without excessive heat generation, balancing maximum energy production with thermal management.
Solution Approach 2:
The patent employs feedback mechanisms where each power regulator's controller monitors its own operational characteristics and adjusts power output accordingly. This feedback control prevents overheating by reducing power output when temperature thresholds are approached, while maintaining overall system productivity through coordinated operation of all power sources.
Data Source
AI summary
A power system may comprise a plurality of power sources, each connected to a corresponding power regulator. The power regulators may be connected in series or in parallel, and may form a string. Each power regulator may comprise input terminals connected to the corresponding power source, output terminals, and a power converter that may be configured to convert input power from the corresponding power source to output power. The power regulator may further comprise a regulator communications module that may be configured to receive a power regulation indication relating to regulating an operational characteristic of the power regulator. The regulator controller may be configured to instruct the power converter to increase or decrease the regulator operational characteristic based on the power regulation indication, and based on power production characteristics of the power regulator.