Multi-Winding UPS Machine for Medium-Voltage Power Scaling
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Solution Overview
Problem
Existing uninterruptible power supply (UPS) systems are limited in providing higher electric powers and require additional components when connected to medium voltage grids, necessitating increased complexity and cost.
Innovation Solution
A UPS design featuring a rotating electric machine with multiple motor windings and energy storages connected via inverters, where the generator winding has a higher winding count than motor windings, allowing for direct connection to medium voltage grids without additional transformers, and enabling power multiplication by increasing motor windings and energy storages while maintaining existing inverter and storage configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If existing UPS systems are used to provide higher electric powers, then power output increases, but device complexity and cost increase due to additional components and transformers
Solution Approach 1:
The generator winding is divided into multiple independent motor windings (first motor winding, second motor winding, third motor winding) that are electrically insulated from each other. Each motor winding can be independently connected to energy storages and inverters, allowing modular scaling of power capacity without increasing overall system complexity. This segmentation enables parallel operation of multiple power channels.
Solution Approach 2:
The rotating electric machine serves multiple functions: the generator winding acts as both a generator and a motor, while each motor winding can operate as both motor and generator depending on power flow direction. This multi-functionality eliminates the need for separate transformers and additional conversion equipment when connecting to medium voltage grids, reducing system complexity.
2Adaptability or versatility
If existing UPS systems are connected to medium voltage grids, then grid integration is achieved, but additional transformers and components are required
Solution Approach 1:
The generator winding can operate in both motor and generator modes, enabling direct connection to medium voltage grids without requiring separate transformers. The winding adapts its function based on power flow direction, serving as a generator when supplying power to the grid and as a motor when drawing power from the grid.
Solution Approach 2:
Instead of using a transformer to step up voltage from the generator, the invention inverts the approach by designing the generator winding itself to operate at medium voltage levels. The generator winding is configured with sufficient turns and insulation to directly interface with medium voltage grids, eliminating the transformer component.
3Power
If multiple UPS products are connected in parallel to provide higher power, then power capacity increases, but coordination of electric powers becomes complex
Solution Approach 1:
Multiple independent motor windings and their associated energy storages are merged into a single rotating electric machine structure. The shared rotor and stator core provide inherent mechanical and electromagnetic coupling, automatically coordinating power distribution among parallel channels without requiring complex external control systems for power balancing.
Solution Approach 2:
The power system is segmented into independent modular channels, each consisting of a motor winding, energy storage, and inverter. These modular segments can be independently configured and controlled, then easily combined in parallel. Each segment operates semi-independently, simplifying the coordination of total power output compared to connecting complete UPS systems in parallel.
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 design enables the supply of higher electric powers without increasing individual component power, simplifying configuration and reducing costs by allowing direct connection to medium voltage grids, optimizing machine speed, and providing reliable power through synchronized inverters and diverse energy storage combinations.
Implementation Method 1
a rotating electric machine having a generator winding and a plurality of motor windings which are electrically insulated from the generator winding and from one another
Implementation Method 2
an inverter outputting an alternating current, wherein the energy storage is connected to the respective motor winding via the inverter
Data Source
AI summary
An apparatus for uninterruptible power supply (UPS) comprises a rotating electric machine having a generator winding and a plurality of motor windings. The motor windings of the plurality of motor windings are electrically insulated from the generator winding and from one another. The UPS further comprises, for each motor winding, an energy storage for electric energy and an inverter which outputs an alternating current and via which the energy storage is connected to the respective motor winding.