Modular Converter System Series-Connected Transformers
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Solution Overview
Problem
The transportation and deployment of large, heavy transformers in medium-voltage electrical supply networks are cumbersome and costly, and existing converter systems without transformers are either expensive or limited in dynamics, necessitating a more efficient and cost-effective solution.
Innovation Solution
A modular converter system comprising multiple converter devices with voltage sources, inverters, and transformers, where secondary coils are connected in series to generate medium voltage, allowing for adjustable voltage and simplified transport, with built-in measuring and control units for sinusoidal output and fault compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If large and heavy transformers are used to feed electricity into or draw electricity from the medium-voltage grid, then the power transmission capability is improved, but the transportation and deployment become cumbersome and costly
Solution Approach 1:
The patent divides the converter system into multiple modular converter devices (first converter device and at least one second converter device), each with its own transformer device. Instead of using one large transformer, the system uses multiple smaller transformers connected in series at the secondary coil level to achieve the required medium voltage output. This segmentation reduces the weight and transportation difficulty of individual transformer components while maintaining the overall power transmission capability.
2Ease of operation
If converter systems without transformers are used to avoid transportation problems, then the transportation effort is reduced, but the costs increase and dynamics are limited
Solution Approach 1:
The system uses multiple modular converter devices with standard-voltage transformers rather than a single complex medium-voltage converter. Each module can be independently manufactured and transported, then combined to achieve the required medium voltage through series connection of secondary coils.
Solution Approach 2:
Multiple converter devices with standard-voltage transformers are combined through series connection of their secondary coils to generate medium voltage. This merging approach achieves the voltage transformation capability of a single medium-voltage transformer while using multiple smaller, more transportable units.
3Adaptability or versatility
If transformers and converters are manufactured separately for projects and oversized to meet requirements, then the adaptability to different projects is improved, but the costs and transportation difficulties increase
Solution Approach 1:
The system uses standardized modular converter devices that can be combined in different quantities to meet various project requirements. Instead of manufacturing oversized custom transformers for each project, the same modular units are assembled in series to achieve different voltage levels, reducing both weight and manufacturing costs.
Solution Approach 2:
The modular converter devices are designed with universal interfaces and standardized components that can be used across different projects. The same basic module can serve multiple purposes by simply changing the number of units connected in series, providing adaptability without requiring custom oversized 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 modular design reduces transportation efforts and costs, enables efficient and dynamic voltage adjustment, and ensures high efficiency by eliminating the need for downstream transformers or filters, while allowing for easy maintenance and replacement of components.
Implementation Method 1
a transformer device for transforming the AC voltage provided by the inverter present in a primary coil into a transformed AC voltage present in a secondary coil
Data Source
Figure 1
AI summary
The invention relates to a converter system (1) for an electric supply network, comprising - a first and at least one second converter device (2), each of the converter devices (2) comprising - a voltage source (3) for providing an electric voltage (UG), - an inverter device (4) for providing an AC voltage (U1, U2, U3) from the electric voltage (UG) ) provided by the voltage source (3), and - a transformer device (5) for transforming the AC voltage (U1, U2, U3) which is provided by the inverter (4) and which is applied to a primary coil into a transformed AC voltage UT1, UT2, UT3) which is applied to a secondary coil, wherein - the secondary coils of the first and the at least one second converter device (2) are electrically connected in series, and - a medium voltage formed by the series circuit of the secondary coils is applied to an output (A1, A2, A3) of the converter system (1).