Voltage-Impressing Electrolysis Converter for Instant Frequency Response
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Solution Overview
Problem
Existing electrolysis devices with current-impressing converters are unable to immediately respond to frequency changes in the AC voltage grid, making them unsuitable for providing instantaneous balancing power or reserve.
Innovation Solution
The method involves operating an electrolysis device with a converter in a voltage-impressing manner, allowing for immediate changes in AC active power drawn from the AC voltage grid in response to changes or rates of change in the grid frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a current-impressing converter is used in an electrolysis device, then the converter can operate with a predefined setpoint for DC power, but it cannot immediately respond to frequency changes in the AC voltage grid
Solution Approach 1:
The converter operates in voltage-impressing mode instead of current-impressing mode, changing the control parameter from current to voltage. This allows the converter to immediately respond to frequency changes by adjusting the AC active power drawn from the grid, enabling instantaneous reserve provision for grid frequency stabilization
Solution Approach 2:
The patent inverts the conventional control approach by using voltage-impressing operation rather than current-impressing operation. This inversion enables the electrolysis device to provide instantaneous balancing power by immediately changing AC active power in response to frequency deviations, opposite to the delayed response of conventional current-impressing converters
2Productivity
If the electrolysis device operates at nominal power, then maximum electrolysis output is achieved, but no instantaneous reserve power is available for grid frequency stabilization
Solution Approach 1:
The converter is controlled to draw AC active power that exceeds or is less than the power required for nominal electrolysis operation. This partial deviation from nominal power creates instantaneous reserve power capability while maintaining productive operation, allowing the device to simultaneously provide grid frequency stabilization and electrolysis output
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 approach enables the electrolysis device to provide instantaneous reserve power for stabilizing the grid frequency, mimicking the immediate response of synchronous machines and effectively supporting grid frequency stability during transient conditions.
Implementation Method 1
an electrolysis device having a converter, to a method for operating an electrolysis device having a converter
Data Source
AI summary
A method for operating an electrolysis device, having a converter which is connected on an AC voltage side to an AC voltage grid via a decoupling inductance and draws an AC active power from the AC voltage grid, and an electrolyzer, which is connected to the converter on the DC voltage side, is provided. The method includes operating the electrolysis device, when a grid frequency corresponds to a nominal frequency of the ACT voltage grid and is substantially constant over a time period, with an electrical power which is between 50% and 100% of a nominal power of the electrolyzer, and operating the converter in a voltage-impressing manner, such that an AC active power drawn from the AC voltage grid is changed on the basis of a change and/or a rate of change of the grid frequency in the AC voltage grid.