Modular Frequency Converter Assembly for Wind Turbines
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power converter arrangements in wind and photovoltaic systems face challenges in adapting variable output voltages to a supply network, requiring conversion of time-varying wind turbine frequencies and DC voltages to a constant AC voltage, while also needing to be service-friendly for quick and inexpensive replacement of defective components.
Innovation Solution
A modular power converter arrangement composed of identical converter assemblies, including a capacitor module and a switching module, with a connecting device for circuit-compatible electrical connections and a rail system for easy assembly and disassembly, allowing for the formation of a three-phase bridge circuit and enabling efficient energy conversion and feeding into a power grid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cascaded arrangements of power semiconductor modules are used to convert variable voltages to constant AC frequency, then the conversion function is achieved, but the serviceability and ease of component replacement deteriorate
Solution Approach 1:
The power converter arrangement is divided into multiple identical converter assemblies, each comprising a capacitor module and a switching module. This segmentation allows individual modules to be independently serviced or replaced without affecting the entire system, thereby improving ease of repair while maintaining the conversion function.
Solution Approach 2:
Each converter assembly is designed with uniform local characteristics (identical modules with standardized connections), enabling localized maintenance and replacement. The DC voltage contact devices and AC voltage contact devices are positioned to allow front-side access for servicing specific modules without dismantling the entire arrangement.
2Adaptability or versatility
If modular converter assemblies are arranged in parallel to form main modules, then the adaptability and manufacturing simplicity improve, but the device complexity increases
Solution Approach 1:
The converter assemblies are designed as universal modules that can be arranged in parallel to form main modules of different configurations. Each module serves multiple functions: voltage conversion, energy storage (via capacitor module), and can be independently serviced. The standardized DC voltage contact devices and AC voltage contact devices enable these modules to be universally connected in various parallel arrangements.
Solution Approach 2:
The modular structure implements a nested hierarchy: converter assemblies (comprising capacitor module and switching module) are nested within main modules, which are in turn arranged in parallel within the power converter arrangement. This nested organization manages complexity by creating clear levels of modularity and standardization at each level.
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 modular design facilitates easy manufacturing, servicing, and component replacement, ensuring reliable and efficient conversion of variable voltages to a constant AC frequency, enhancing the service-friendliness and operational efficiency of power converter systems.
Implementation Method 1
The capacitor module has a plurality of capacitors and at least one DC voltage contact device for electrical connection to a DC voltage contact device of the associated switching module
Implementation Method 2
cascaded arrangements of commercially available power semiconductor modules are known... to generate a defined AC voltage with a constant frequency
Data Source
Figure 1
Figure 2~5
Figure 3
AI summary
The invention relates to a power converter arrangement with a control cabinet comprising a plurality of power converter assemblies, each forming a main module and a submodule, each consisting of a switching module and a capacitor module. The control cabinet has connection devices for the electrical connection of the power converter assemblies and a rail system for each power converter assembly for its mechanical arrangement. The capacitor module has a DC contact device for electrical connection to the associated switching module and sliding elements. The switching module has a cooling device, power semiconductor modules, and its own sliding elements. The sliding elements of the submodules are stacked in the same rail of the control cabinet's rail system.