Ungrounded DC Electrolysis Network for Stray Current Isolation
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Solution Overview
Problem
Electrolysis systems in microgrid operations experience corrosive damage due to electric stray currents, which reduce efficiency and lead to premature ageing and failure of membranes, particularly in off-grid installations like offshore wind turbines or remote areas, where transformer-based galvanic decoupling is uneconomical.
Innovation Solution
The system employs a central DC high-performance strand as an ungrounded IT network, connecting the power supply source and electrolysis plant, eliminating the need for galvanic decoupling and reducing stray currents by operating components insulated from ground, with an insulation monitor to detect faults and ensure safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transformer-based galvanic decoupling is used to protect against stray currents, then membrane reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates the transformer component from the system by implementing an ungrounded IT network architecture. This removes the need for galvanic decoupling while maintaining protection against stray currents, thereby reducing device complexity and cost while preserving membrane reliability.
Solution Approach 2:
The patent changes the electrical network configuration parameter from grounded to ungrounded (IT network). This parameter change fundamentally alters how the system handles stray currents, providing protection without requiring additional galvanic decoupling equipment, thus resolving the contradiction between reliability and complexity.
2Duration of action of stationary object
If an ungrounded IT network is implemented to reduce stray currents, then membrane lifespan is improved, but manufacturing complexity increases
Solution Approach 1:
The ungrounded IT network serves multiple functions simultaneously: it reduces stray currents to extend membrane lifespan, provides electrical isolation without transformers, and enables flexible microgrid operations. This multi-functionality offsets the increased manufacturing complexity by eliminating the need for separate galvanic decoupling equipment.
3Object-affected harmful factors
If components are operated insulated from ground to eliminate stray currents, then corrosion damage is reduced, but ease of operation decreases
Solution Approach 1:
The ungrounded IT network provides self-protection against stray currents and corrosion without requiring active intervention or complex control systems. The system automatically maintains the protective electrical configuration, reducing corrosion damage while minimizing the impact on ease of operation through automated rather than manual management.
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 design reduces corrosion effects, increases uptime, and lowers maintenance costs while maintaining flexible and cost-effective operation independent of the public grid, allowing for efficient hydrogen production in microgrid environments.
Implementation Method 1
a central supply line (5) which is connected to the direct voltage output (7) of the power supply source (3) such that a direct current can be fed to the central supply line (5)
Implementation Method 2
During electrolysis, redox reactions related to material conversions may be enforced by impressing an electric current through suitable cell elements
Implementation Method 3
During electrolysis, redox reactions related to material conversions may be enforced by impressing an electric current through suitable cell elements
Implementation Method 4
anode and cathode half-spaces are separated by means of diaphragms (or membranes) which allow electrical conductivity (ion and/or proton exchange) but prevent mass transfer
Implementation Method 5
an insulation monitor (25A, 25B) is provided, by which a minimum insulation resistance of insulated network (17) from ground is monitored
Data Source
AI summary
The invention relates to an electrolysis system including an electrolysis plant and a power supply source with a direct voltage output and including a central supply line, wherein the central supply line is connected to the direct voltage output of the power supply source such that a direct current can be fed to the central supply line, where a central DC high-performance strand designed for the direct voltage is provided, to which high-performance strand the electrolysis plant is connected via the central supply line, wherein at least the power supply source and the DC high-performance strand are designed as a network insulated from ground. The invention also relates to the use of an insulated DC network in an electrolysis system.