Modular Converter Arrangement for Scalable Power Output
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Solution Overview
Problem
Existing converter arrangements for electric arc furnaces lack scalability and flexibility in adapting to varying power outputs and load requirements, particularly in terms of harmonic content and reactive power, and do not effectively manage direct currents that can damage transformer saturation.
Innovation Solution
A modular converter arrangement with series-connected sub-modules, each comprising a converter module, an inverter module, and a transformer module, where the transformer module outputs are connected in parallel to form AC output connections, allowing for adjustable power output and harmonic control, and incorporating fuses and capacitors to manage overcurrents and direct currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If converter arrangements use fixed non-modular designs, then structural simplicity is maintained, but scalability and adaptability to varying power outputs are limited
Solution Approach 1:
The converter arrangement is divided into multiple identical sub-modules, each comprising a converter module (with IGBT switches), an inverter module, and a transformer module. These sub-modules can be connected in series to achieve different voltage levels and power outputs, enabling scalable adaptation to various load requirements while maintaining structural simplicity through repetition of standardized units
2Adaptability or versatility
If converter arrangements use fixed designs, then manufacturing simplicity is maintained, but flexibility in adapting to load requirements and harmonic control is reduced
Solution Approach 1:
Each sub-module is designed as a universal building block that can perform multiple functions: voltage conversion through the transformer module, frequency inversion through the inverter module, and power conversion through the converter module. This universality allows the same standardized sub-module design to be used across different power levels and application scenarios, providing manufacturing economies of scale while maintaining flexibility
3Reliability
If direct current components are allowed in transformer modules, then circuit simplicity is maintained, but transformer saturation and damage risk increase
Solution Approach 1:
The circuit configuration is specifically designed to extract and eliminate direct current components before they reach the transformer modules. The converter and inverter modules are arranged and controlled to ensure that only alternating current components are transmitted to the transformers, thereby protecting them from saturation while maintaining relatively simple circuit structures
4Object-affected harmful factors
If overcurrent protection is not implemented, then device simplicity is maintained, but fire risk and safety are increased
Solution Approach 1:
Fuse elements are integrated into each sub-module's circuit configuration, positioned to detect and respond to overcurrent conditions before they can cause dangerous heating or fire. This preliminary protection measure is built into the basic modular structure, providing safety without requiring complex external protection systems
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 enables scalable power output adaptation to specific load requirements, optimizes current profiles for electric arc furnaces, reduces the risk of fire, and suppresses direct currents, ensuring efficient and stable operation.
Implementation Method 1
each sub-module comprising at least one converter module (221), one inverter module (222) and one transformer module (223), wherein the converter module (221) is designed to convert an input AC voltage to a DC voltage
Implementation Method 2
the inverter module (222) is designed to convert the DC voltage to an AC voltage
Implementation Method 3
the transformer module (223) is designed to transform the AC voltage to a different AC voltage
Data Source
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AI summary
The invention relates, inter alia, to a converter arrangement (10) having at least one input alternating voltage connection (E20a, E20b, E20c), to which an alternating current can be supplied, and at least one output alternating voltage connection (A20a, A20b, A20c), from which alternating current can be taken, wherein the converter arrangement (10) comprises at least one series connection (200) having at least two sub-modules (220) connected in series, wherein the sub-modules (220) of the series connection (200) each comprise at least one converter module (221), one inverter module (222) and one transformer module (223). According to the invention, the outputs of the transformer module (223) are connected in parallel and form the output alternating voltage connection (A20a, A20b, A20c) or at least one of the output alternating voltage connections.