Electrolyzer Converter Switching for Fault Ride-Through Reactive Power
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Solution Overview
Problem
Existing electrolyzing plants face challenges in maintaining stable operation during power network faults, such as brownouts and blackouts, and are unable to provide sufficient reactive power support, which affects grid stability and compliance with FRT requirements, especially with the increasing integration of renewable energy sources.
Innovation Solution
The electrolyzing plant is equipped with a control apparatus that switches the electric converter to an alternating mode, utilizing a polarization energy source to supply reactive power to the power network during faults, thereby stabilizing the grid by providing capacitive or inductive reactive power as needed, while maintaining rectification capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrolyzing plants operate with conventional rectifying converters during power network faults, then the electrolyzing process can continue, but the plants cannot provide reactive power support to stabilize the grid
Solution Approach 1:
The electric converter dynamically switches between rectifying modus and alternating modus based on grid conditions. During normal operation, it functions as a rectifier for electrolysis. During faults, it transitions to alternating modus to provide reactive power support, enabling adaptive response to different operational states and resolving the contradiction between continuous operation and grid support capability
Solution Approach 2:
The electric converter is designed to perform multiple functions: rectification for electrolysis during normal operation, and reactive power compensation during faults. This multi-functionality allows a single device to address both the electrolysis power requirement and grid stability support, eliminating the need for separate equipment
2Reliability
If additional equipment is added to enable reactive power support during faults, then grid stability can be improved, but device complexity and cost increase
Solution Approach 1:
The existing electric converter is made multi-functional by enabling alternating modus operation, allowing it to provide reactive power support without requiring additional compensation equipment. This approach maintains grid stability support capability while avoiding increased device complexity
Solution Approach 2:
The electrolyzing plant uses its own internal polarization energy source to provide reactive power support during faults, rather than requiring external or additional equipment. The system serves its dual purpose of electrolysis and grid support using existing resources, reducing overall system complexity
3Reliability
If the electric converter operates in alternating modus during faults, then reactive power can be supplied to stabilize the grid, but energy consumption from the polarization energy source increases
Solution Approach 1:
The polarization energy source, which is normally used only for electrode polarization during electrolysis, is repurposed to provide reactive power support during grid faults. By converting this existing energy resource into a dual-purpose asset, the system can support grid stability while utilizing already-allocated energy resources, thereby reducing the net energy burden
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 enhances the stability of the power network by allowing electrolyzing plants to ride through faults and support grid stability without additional equipment, leveraging existing polarization energy sources to supply reactive power, thus reducing the impact of network disturbances.
Implementation Method 1
converting is affected by an electric converter connected with the electric power network, which electric converter operates in a rectifying modus during an intended electrolyzing operation of the electrolyzing plant
Implementation Method 2
the polarization voltage is provided by a polarization energy source of the electrolyzing plant
Implementation Method 3
detecting the alternating voltage with a voltage sensor providing a sensor signal
Implementation Method 4
electrolyzing of water by providing an electrolyzing process
Data Source
Figure 1~3
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Figure 5
AI summary
The invention relates to a method for controlling an electrolyzing plant (10) having an electrolyzing device (26), wherein the method comprises: - converting an alternating voltage of an electric power network (12) into an electrolyzing voltage, wherein converting is affected by an electric converter (22), which electric converter operates in a rectifying modus, - subjecting the electrolyzing device to a polarization voltage for a predetermined period at off-time, wherein the polarization voltage is provided by a polarization energy source (30), - detecting the alternating voltage with a voltage sensor (36) providing a sensor signal, and - comparing the sensor signal with at least one reference value, - dependent on a comparing result, subjecting the electrolyzing device and the electric converter to the polarization voltage, and - operating the electric converter in an alternating modus, wherein electric power of the polarization energy source is supplied to the electric converter in order to allow the electric converter supplying reactive power to the electric power network.