Electrolysis Converter Topology for Low-Ripple DC Supply
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Solution Overview
Problem
Existing power supply facilities for electrolysis plants suffer from system perturbations and current ripple due to thyristor and diode rectifiers, which are inefficient and costly, and transistor power converters exacerbate these issues with potential short circuits and high energy flow requirements.
Innovation Solution
A power supply facility with a first transformer arrangement, a rectifier, and an additional unit comprising a second transformer arrangement and a transistor power converter, along with a DC-DC converter, which is controlled to minimize system perturbations and current ripple, reducing the need for filter inductance and lowering energy flow through the additional unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a thyristor rectifier is used to supply high current at low voltage to the electrolysis plant, then the system can operate with partial modulation capability, but it generates large system perturbations and current ripple
Solution Approach 1:
A DC-DC converter is introduced as an intermediary component between the rectifier and the electrolysis plant. This converter acts as a mediator that decouples the rectifier from the electrolysis cell, allowing the rectifier to operate with modulation capability while the DC-DC converter filters out the generated perturbations and current ripple, preventing them from reaching the electrolysis plant.
Solution Approach 2:
The power supply system is segmented into distinct functional modules: a rectifier stage for AC-DC conversion with modulation capability, and a separate DC-DC converter stage for current regulation and filtering. This segmentation allows each module to perform its specific function optimally - the rectifier provides adaptability while the DC-DC converter handles the harmful factors.
2Adaptability or versatility
If a transistor power converter is used to compensate for current ripple, then modulation control can be improved, but it creates vulnerability to short circuits and requires high energy flow capacity
Solution Approach 1:
The DC-DC converter serves as a protective intermediary between the AC grid/rectifier and the electrolysis plant. It provides galvanic isolation and current limiting capabilities that protect against short circuits. The converter's controlled switching architecture allows for safe fault detection and protection without requiring the transistor power converter to handle full system power.
Solution Approach 2:
The DC-DC converter is designed with inherent protection mechanisms including current limiting, overvoltage protection, and fault detection circuits that activate before short circuits can cause damage. This beforehand cushioning approach prevents catastrophic failures by anticipating and mitigating potential faults before they occur.
3Object-generated harmful factors
If additional components are added to ameliorate system perturbations from rectifiers, then current ripple can be reduced, but system costs increase
Solution Approach 1:
The DC-DC converter is designed as a multi-functional component that simultaneously performs current regulation, current ripple filtering, system perturbation mitigation, and protection functions. This universal approach consolidates multiple potential components into a single integrated solution, reducing overall system complexity and cost compared to adding separate components for each function.
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 solution effectively reduces current ripple and system perturbations, lowers costs by minimizing filter inductance, and enhances stability and efficiency by controlling energy flow, while protecting the transistor power converter from short circuits.
Implementation Method 1
a first transformer arrangement (4) and a rectifier (3), wherein the rectifier (3) draws electrical energy from an AC voltage grid (7) via the first transformer arrangement (4)
Implementation Method 2
the transistor power converter (11) is connected to the secondary side (6) of the second transformer arrangement (10) and to the DC link (8) of the rectifier (3)
Data Source
AI summary
A power supply facility for supplying an electrolysis plant with electrical energy has a rectifier and a first transformer arrangement with a primary side drawing electrical energy from an alternating voltage grid and a secondary side supplying the electrolysis plant with the electrical energy via a DC link. The power supply facility has an additional unit with a second transformer arrangement, a transistor power converter and a DC-DC converter. The primary side of the second transformer arrangement is connected in series with either the primary side or the secondary side of the first transformer arrangement. The transistor power converter is connected to the secondary side of the second transformer arrangement and the DC-DC converter. The DC-DC converter is connected to the DC link of the rectifier.