Shared Filter and Capacitor Arrangement for Drive Systems
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Solution Overview
Problem
Existing electrical supply network systems face challenges in effectively suppressing interfering current components and managing switching overvoltages, particularly in compact designs with multiple drives and converters.
Innovation Solution
The system incorporates a filter connected to both the input and output sides, featuring additional capacitance arrangements between inverters and motor-side DC connections, forming cycloconverters, which, along with filter inductances and capacitances, create a low-pass filter to dampen pulse-frequency components and limit overvoltages, allowing a single filter to serve multiple drives and enabling efficient power exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a filter is used to suppress unwanted current components in electrical systems, then current quality is improved, but system complexity increases
Solution Approach 1:
The patent combines multiple filter arrangements into a single shared filter that serves multiple drives. The filter is connected to the electrical supply network and provides filtering for all drives through common filter inductances and capacitances, eliminating the need for separate filters for each drive and reducing overall system complexity.
Solution Approach 2:
The single filter arrangement performs multiple functions: it filters unwanted current components for all drives simultaneously, provides capacitance for voltage stabilization, and enables reactive power compensation. This multi-functional design reduces the number of components needed while maintaining effective filtering across the entire system.
2Object-affected harmful factors
If additional capacitance arrangements are connected close to each inverter, then switching overvoltages are limited, but device complexity increases
Solution Approach 1:
The patent merges individual capacitance arrangements into a shared capacitor bank that serves all inverters. The additional capacitances are connected in parallel between the star point and each network phase, providing overvoltage protection for all drives through a single common arrangement rather than requiring separate capacitances for each inverter.
3Object-affected harmful factors
If multiple filters are used for multiple drives, then filtering effectiveness is improved, but cost and complexity increase
Solution Approach 1:
The single filter arrangement is designed to serve multiple drives simultaneously through its connection to the common electrical supply network. The filter inductances and capacitances provide filtering effectiveness for all connected drives, eliminating the need for multiple separate filters and reducing both quantity and cost.
4Device complexity
If a single filter serves multiple drives, then system compactness is improved, but filtering effectiveness may deteriorate
Solution Approach 1:
The patent implements local quality by connecting additional capacitances close to each inverter while maintaining a single centralized filter arrangement. The additional capacitances provide local overvoltage protection where needed, while the main filter provides centralized filtering. This hierarchical approach maintains filtering effectiveness despite the shared filter configuration.
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 configuration effectively suppresses interfering current components, limits switching overvoltages, and allows for compact, efficient power management across multiple drives, reducing the need for multiple filters and enabling power exchange between drives, such as flywheel mass storage devices.
Implementation Method 1
a low-pass filter is formed with the filter capacitance CF, so that pulse-frequency power components of the inverter are attenuated
Implementation Method 2
the additional capacitance arrangement between each pair of network phases has an additional capacitance Cs. The advantage here is that switching overvoltages are limited, especially those generated by parasitic inductances
Data Source
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AI summary
The invention relates to a system, comprising a network, in particular an electrical supply network, a filter, and one or more drives, wherein the filter is connected on one side, in particular on an input side, to the network and on the other side, in particular on an output side, at least one electrical line is connected to the drives, wherein each drive has an additional capacitor assembly connected to the electrical line, which additional capacitor assembly is arranged on the alternating-voltage connection of an inverter, the direct-voltage connection of which is connected to the direct-voltage connection of a motor-side inverter, the alternating-voltage output of which feeds an electric motor, in particular such that the two inverters arranged between the additional capacitor assembly and the motor act as cycloconverters.