Three-Winding Phase-Shifting Transformer for Grid Power Flow Control
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Solution Overview
Problem
Conventional transformers lack power flow control functions, leading to transmission bottlenecks and inefficiencies in power systems with fluctuating energy sources and loads, necessitating the integration of step-down and phase-shifting transformers for flexible power flow control.
Innovation Solution
A step-down and phase-shifting transformer with a three-phase three-winding structure, incorporating a phase modulation winding with a tap-position adjustment switch, allows for voltage transformation and phase angle control between grids, enabling flexible power flow management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional transformers are used without power flow control functions, then the structure is simple and reliable, but transmission bottlenecks occur and power flow optimization is impossible
Solution Approach 1:
The patent merges the step-down transformer function and phase-shifting function into a single integrated device. The three-winding transformer combines voltage transformation (step-down) and phase angle adjustment capabilities, eliminating the need for separate transformer and phase shifter equipment, thus resolving the contradiction between power flow control capability and device complexity
Solution Approach 2:
The three-winding transformer is designed to perform multiple functions simultaneously: voltage step-down transformation and phase-shifting control. This multi-functional design allows a single device to replace what would traditionally require multiple specialized devices, improving productivity while managing complexity
2Productivity
If separate transformer and phase shifter are disposed in output line, then power flow control function is achieved, but land area and investment are increased
Solution Approach 1:
The patent integrates the transformer and phase shifter into a single three-winding transformer unit. By combining these previously separate devices into one integrated structure, the land area required for installation is significantly reduced while maintaining both voltage transformation and phase-shifting control functions
3Productivity
If separate transformer and phase shifter are disposed in output line, then power flow control function is achieved, but investment cost is increased
Solution Approach 1:
The patent combines multiple equipment functions into a single three-winding transformer, reducing the total quantity of equipment required. This integration eliminates redundant components and reduces both material quantity and investment cost while achieving the desired power flow control functionality
Solution Approach 2:
The three-winding transformer is designed as a multi-functional device that performs both voltage step-down and phase-shifting operations. This universality allows one piece of equipment to replace what would traditionally require multiple specialized devices, thereby reducing investment costs
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 integrated transformer facilitates efficient power flow control, reducing land area and investment requirements compared to separate transformer and phase shifter arrangements, supporting power grid interconnection and regulation.
Implementation Method 1
the third winding is magnetically coupled to the first winding and the second winding
Data Source
AI summary
Disclosed are a step-down and phase-shifting transformer and an operational control method thereof. The step-down and phase-shifting transformer is connected to grids on at least two sides and at least includes a first winding, a second winding, and a third winding. The third winding is provided with a tap-position adjustment switch, the third winding is magnetically coupled to the first winding and the second winding, and the third winding is electrically connected to the first winding or the second winding, such that phase angle control and transmission power control between grids on different sides can be realized by adjusting the tap-position adjustment switch on the basis of voltage transformation.