Direct-Coupled PV-Electrolyzer System Configuration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current large-scale hydrogen production systems using solar photovoltaic coupled water electrolysis face high capital costs due to the need for extensive power conversion and control hardware, which is inefficient and not economically viable for large-scale applications.
Innovation Solution
A direct-coupled water electrolysis system configuration that eliminates AC power conversion by directly connecting a photovoltaic array to an electrolyzer stack, with an auxiliary power supply for stable operation, and optimizing performance curves of both systems to match their degradation rates, reducing the need for power electronics and capital costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If AC power conversion hardware is used to connect photovoltaic array to electrolyser system, then system reliability is improved, but capital cost and device complexity increase significantly
Solution Approach 1:
The patent extracts and removes the AC power conversion hardware (inverters, rectifiers, transformers) from the system by implementing direct DC coupling between the photovoltaic array and electrolyser. This eliminates the problematic power conversion stage while maintaining system functionality through direct electrical connection, thereby reducing complexity without sacrificing reliability.
Solution Approach 2:
The patent introduces DC-DC conversion as an intermediary solution between the photovoltaic array and electrolyser. This intermediate conversion stage allows for proper impedance matching and power optimization while avoiding the need for AC conversion hardware, thus reducing overall system complexity while maintaining reliable operation.
2Stability of the object's composition
If AC power conversion and control hardware are extensively used, then system stability is improved, but capital cost increases making it economically unviable
Solution Approach 1:
The patent removes extensive AC power conversion and control hardware from the system by implementing direct DC coupling. This extraction eliminates the need for expensive inverters, rectifiers, and associated control systems, thereby reducing capital cost while maintaining system stability through simplified architecture.
Solution Approach 2:
The patent enables the photovoltaic array and electrolyser to work directly together in DC mode, allowing the system to self-regulate without expensive external control hardware. The natural electrical characteristics of the DC components work together to maintain stability, reducing the need for additional stabilization equipment.
3Device complexity
If photovoltaic array is directly coupled to electrolyser stack, then capital cost is reduced, but power matching and system optimization become more difficult
Solution Approach 1:
The patent introduces DC-DC conversion as an intermediary that simplifies power matching between the photovoltaic array and electrolyser stack. This intermediate stage provides the necessary electrical interface to match power characteristics, making the direct coupling system easier to operate while maintaining low capital costs.
Solution Approach 2:
The patent implements dynamic control of the DC-DC conversion stage to automatically adjust and match power output from the photovoltaic array with the power requirements of the electrolyser stack. This dynamic adaptation simplifies operation by automatically optimizing power transfer without requiring manual intervention or complex external control systems.
4Productivity
If control system is added to optimize system performance, then productivity is improved, but capital cost increases due to additional hardware
Solution Approach 1:
The patent enables the system to optimize its own performance through the inherent characteristics of the DC-DC conversion stage, which automatically adapts to match power requirements. This self-optimizing capability improves hydrogen production efficiency without requiring additional expensive control hardware, as the conversion stage itself provides the optimization function.
Solution Approach 2:
The patent makes the DC-DC conversion stage a multi-functional component that simultaneously performs power conversion, power matching, and system optimization functions. This universal component improves productivity through integrated control capabilities while avoiding the need for separate dedicated control hardware, thereby minimizing capital cost.
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 configuration enables efficient, cost-effective large-scale hydrogen production with minimized power electronics and conversions, achieving optimized efficiency and reduced capital costs for solar photovoltaic coupled electrolysis systems.
Implementation Method 1
The first component is a PV-array which is directly connected to the second component which is an electrolyzer stack or multiple electrolyzer stacks
Implementation Method 2
an electrolyzer arrangement having at least one electrolyzer stack directly connected to the photovoltaic array
Data Source
AI summary
The present invention relates to a direct-coupled water electrolysis system and a method of configuring a such system comprising at least four components, a PV-array which is directly connected to one or more electrolyzer stacks, an electrolyzer system balance-of-plant, and an auxiliary power supply, the method comprising the steps of:a) providing a predetermined initial performance curve, providing an average degradation rate, and calculating an anticipated performance curve of the PV array;b) providing a predetermined initial performance curve, providing an average degradation rate, and calculating an anticipated performance curve of the electrolyzer stack(s);c) configuring the electrolyzer stack(s) by matching the anticipated electrolyzer stack(s) performance curve with the anticipated PV array performance curve.The invention provides for operating a solar photovoltaic coupled electrolyser system at large scale up to multi-GW installed capacity, with few power electronics and conversions enabling low capital costs and optimised efficiency of the system.