Regulating Winding Group Segmentation for High-Voltage Reactive Power Control
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Solution Overview
Problem
Current electrical devices for high-voltage networks are limited to a reactive power setting range of around 60% at 420kV, which is insufficient to effectively regulate fluctuating reactive power in supply networks.
Innovation Solution
The introduction of two identical control winding subgroups with coarse and fine stages, arranged within the device's housing to increase the reactive power adjustment range without exceeding permissible leakage reactance, utilizing a commercially available on-load tap changer for switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single control winding group is used, then the device structure remains simple, but the reactive power setting range is limited to around 60%
Solution Approach 1:
The control winding group is segmented into two identical control winding subgroups (first and second subgroups), each with independent coarse and fine stages. This segmentation allows the reactive power setting range to be extended beyond 60% by providing additional adjustable taps, while each subgroup maintains a manageable structure that can be independently controlled.
2Adaptability or versatility
If control winding subgroups are added to increase reactive power range, then the adjustment range increases, but the leakage reactance may exceed permissible levels
Solution Approach 1:
The two control winding subgroups are arranged in different spatial dimensions within the housing - one subgroup can be positioned axially or radially relative to the other. This spatial arrangement allows the leakage reactance between subgroups to be minimized by optimizing their relative positions, enabling extended reactive power range without exceeding permissible leakage reactance levels.
3Measurement precision
If coarse and fine stages are implemented in control winding subgroups, then precise reactive power control is achieved, but the switching complexity increases
Solution Approach 1:
The control winding subgroups are divided into coarse stages (with fewer, larger-step taps) and fine stages (with more, smaller-step taps). This segmentation enables precise reactive power control by allowing operators to first make coarse adjustments for large changes and then use fine stages for precise tuning, while the switching mechanism can independently control each stage.
Solution Approach 2:
The switching mechanism is designed to dynamically select and combine different combinations of coarse and fine stage taps based on the required reactive power adjustment. This dynamic switching capability allows precise control across the extended reactive power range without requiring a permanently complex fixed structure.
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 allows for a larger reactive power setting range while maintaining safe operation and precise control, ensuring trouble-free switching and precise reactive power regulation in the network.
Implementation Method 1
a main winding that encloses a section of the core, a control winding group with control windings that are each enclosing a portion of the core
Implementation Method 2
a core made of a magnetizable material that is arranged in the housing
Data Source
Figure 1~2
Figure 3~5
AI summary
In order to provide an electrical device (1) for connection to a high-voltage supply system, having a housing (2) which can be filled with a cooling liquid, having a core (3) which is arranged in the housing (3) and is composed of a magnetizable material, having a main winding (5) which encloses one section (4) of the core (3), having a regulating winding group (6) with regulating windings which each enclose a section (4) of the core (3), and having a switch (19) which selectively allows or prevents a current flow across each regulating winding, which electrical device has a larger reactive power setting range, it is proposed that the regulating winding group (6) has a first regulating winding subgroup (7) and a second regulating winding subgroup (8), wherein the first regulating winding subgroup (7) and the second regulating winding subgroup (8) are of identical construction to one another.