Voltage-Impressing Electrolysis Converter for Instant Grid Reserve
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Solution Overview
Problem
Existing AC voltage grid systems face challenges in providing instantaneous balancing power due to the delayed response of conventional converters, which hinder the ability of DC loads connected via current-impressing converters to stabilize grid frequency effectively.
Innovation Solution
Operating an electrolysis device with a converter in a voltage-impressing manner, allowing immediate changes in AC active power drawn from the grid in response to frequency changes, which are then transferred to the electrolyzer, enabling instantaneous reserve power without requiring fast changes in electrolyzer operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a current-impressing converter is used to connect DC loads to the AC voltage grid, then the converter can operate with a predefined setpoint for DC power, but the response to frequency changes is delayed due to the need for frequency measurement adjustment
Solution Approach 1:
The patent inverts the conventional control approach by using a voltage-impressing converter instead of a current-impressing converter. The converter controller directly controls the converter voltage based on grid frequency measurements, eliminating the delayed response chain. This inversion of the control strategy enables immediate power adjustment in response to frequency deviations, allowing the electrolysis device to provide instantaneous balancing power effectively.
2Productivity
If the electrolyzer operates at nominal power (50-100% of nominal power), then efficient electrolysis is maintained, but the device cannot immediately respond to frequency changes requiring instantaneous reserve power
Solution Approach 1:
The patent introduces the converter as an intermediary device between the grid and the electrolyzer. The converter voltage serves as a mediating control variable that can be adjusted rapidly in response to frequency changes, while the electrolyzer operates at its efficient nominal power point. The converter controller modulates the converter voltage to provide instantaneous power adjustment, decoupling the electrolyzer's operational efficiency from the system's frequency response capability.
3Reliability
If additional energy storage or consumers are added to provide instantaneous reserve power, then frequency stabilization is improved, but device complexity increases
Solution Approach 1:
The patent makes the electrolysis device itself multi-functional by enabling it to simultaneously perform its primary function (electrolysis at nominal power) and provide instantaneous balancing power for frequency stabilization. The voltage-impressing converter allows the electrolyzer to act as both a load and a frequency stabilization device, eliminating the need for separate energy storage systems or consumers and reducing overall system 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 method allows for immediate stabilization of grid frequency by providing instantaneous reserve power, with the electrolyzer temporarily buffering power changes, thus emulating synchronous machine behavior without the need for additional energy storage or consumers.
Implementation Method 1
an electrolyzer (11), which is connected to a converter (12) on a DC voltage side and is supplied with electrical power by the converter (12)
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.