Converter Filter for Energy Storage Protection
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Solution Overview
Problem
Existing converter arrangements lack versatility and effective energy storage capabilities, making them less suitable for universal use in energy distribution systems, particularly in protecting energy storage devices from voltage fluctuations.
Innovation Solution
Incorporating an energy storage device connected to the capacitor of submodules with a filter that attenuates AC voltage frequencies and harmonics, allowing for efficient energy storage and buffering, and enabling the converter arrangement to be used in various energy distribution systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an energy storage device is connected to the capacitor of sub modules without a filter, then energy storage capability is improved, but the service life of the energy storage device deteriorates due to voltage fluctuations from alternating voltage
Solution Approach 1:
A filter is introduced as an intermediary component between the capacitor and the energy storage device. This filter blocks voltage fluctuations and harmonics generated by the alternating voltage connection from reaching the energy storage device, while still allowing energy transfer. The filter thus mediates between the AC voltage source and the energy storage device, protecting the latter without preventing the energy storage function.
2Reliability
If a filter is added between the capacitor and energy storage device, then protection from voltage fluctuations is improved, but device complexity increases
Solution Approach 1:
The filter is designed with specific electrical parameters (inductance and capacitance values) that are optimized to attenuate voltage fluctuations at the fundamental frequency and harmonics while maintaining energy transfer efficiency. By carefully selecting these parameters, the filter provides effective protection without requiring an overly complex multi-stage design.
3Adaptability or versatility
If the converter arrangement is designed for universal use in energy distribution systems, then adaptability is improved, but device complexity increases due to additional connections and components
Solution Approach 1:
The converter arrangement is designed with a modular structure where sub modules can be connected in series to create DC voltage connections, and energy storage devices can be optionally connected to any submodule. This modular design allows the same basic structure to serve multiple functions: voltage conversion, energy storage, and energy distribution, making the system universally applicable without requiring fundamentally different designs for each application.
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 enhances the converter arrangement's versatility and extends its application in energy distribution systems, significantly increasing the service life of energy storage devices by effectively protecting them from voltage fluctuations and enabling efficient energy storage and buffering.
Implementation Method 1
a filter is connected electrically between the capacitor and the energy storage device... which attenuates at least the fundamental frequency of the alternating voltage present at the AC voltage connection
Data Source
AI summary
A converter arrangement has at least one AC voltage connection, at which an alternating current can be fed in or drawn, and at least one DC voltage connection, at which a direct current can be fed in or drawn. The converter arrangement contains at least two series circuits connected in parallel. The external connections of the series circuits form the DC voltage connections of the converter arrangement. Each of the series circuits is connected in parallel and contains in each case at least two submodules connected in series, each of the submodules containing at least two switches and a capacitor. An energy store is to be connected to the capacitor of at least one of the submodules, wherein a filter is connected electrically between the capacitor and the energy store.