Self-Power-Acquiring Controllable Reactor with Tertiary Winding
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Solution Overview
Problem
Current controllable reactors in power grids face challenges in achieving quick response times and reliable power acquisition without external sources, leading to issues with harmonic wave generation and voltage decline during saturation.
Innovation Solution
A self-power-acquiring quick-responsive controllable reactor is designed with a net-side winding connected to a rectifying-filtering unit, allowing for internal excitation power generation and reactance control through a tertiary winding and control unit, enabling rapid response and flexible capacity adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If self-feeding controllable reactor obtains power through control-winding, then it can operate without external power source, but it generates a large amount of harmonic wave and primary voltage of rectifier unit declines with increase of saturation level
Solution Approach 1:
The invention segments the winding structure into net-side winding and control winding, where the net-side winding is specifically designed to provide excitation power to the control winding. This segmentation allows the control winding to receive clean power without generating excessive harmonics, while the net-side winding handles the main power connection.
Solution Approach 2:
The invention introduces a rectifying-filtering unit as an intermediary between the net-side winding and control winding. This intermediary component converts and filters the power from the net-side winding before delivering it to the control winding, effectively reducing harmonic wave generation while maintaining the self-feeding capability.
2Object-generated harmful factors
If controllable reactor uses compensation winding to control harmonic wave amount, then harmonic wave is successfully controlled, but primary voltage of rectifier unit still declines
Solution Approach 1:
The invention segments the power acquisition path by introducing a dedicated net-side winding separate from the control winding. The net-side winding is optimally positioned and designed to provide excitation power without suffering from the voltage decline issues that affect compensation winding arrangements.
Solution Approach 2:
The invention changes the spatial arrangement and connection dimension by introducing a tertiary winding connection mode. The power-acquiring taps are connected to the primary coil of the rectifier through this tertiary dimension, allowing independent optimization of power acquisition and voltage maintenance.
3Reliability
If controllable reactor increases capacity to nominal capacity quickly, then it meets requirement of inhibiting overvoltage and secondary arc current, but response speed must be controlled within 100ms which current technology fails to satisfy
Solution Approach 1:
The invention implements preliminary action by pre-configuring the net-side winding and rectifying-filtering unit to be ready for immediate power acquisition. When a fault occurs, the control system can immediately draw excitation power from the already-positioned net-side winding through the pre-installed rectifying-filtering unit, eliminating delays associated with external power source connection or complex power acquisition sequences.
Solution Approach 2:
The invention enables self-service by allowing the controllable reactor to acquire its own excitation power instantly from the net-side winding through the rectifying-filtering unit when needed. This self-service capability eliminates dependence on external power sources and enables immediate response to faults, achieving the required 100ms response time for overvoltage and secondary arc current inhibition.
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 solution provides flexible control and rapid response within 100ms, effectively inhibiting overvoltage and secondary arc currents, enhancing system stability and security, and reducing line losses across a wide range of power systems from 110kV to UHV.
Implementation Method 1
The power-acquiring taps of the net-side winding (5) are connected with the primary coil of the rectiformer in a rectifying-filtering unit (2) of the controllable reactor
Implementation Method 2
The net-side winding (5) has power-acquiring taps, the rectifying-filtering unit (2) of the controllable reactor connects to the power-acquiring taps of the net-side winding (5), and the output terminal of the rectifying-filtering unit (2) is connect to the control winding (6)
Implementation Method 3
by using compensation winding it can successfully control the amount of the harmonic wave, but it also has the problem with decline of the primary voltage
Implementation Method 4
with the increase of saturation level of the reactor, while by using compensation winding it can successfully control the amount of the harmonic wave
Implementation Method 5
The tertiary winding (7) is connected with the control unit and the detecting unit in the controllable reactor by the quick switch K
Data Source
AI summary
This invention relates to a self power-acquiring quickly responsive controllable reactor whose coil of the main body portion contains a control winding(6), a net-side winding(5), further contains a tertiary winding (7). the tertiary winding(7), the control winding(6) and the net-side winding (5) are set in turn on a magnetic conductive core column of the main body portion (1) from inside to outside; the net-side winding(5) has power-acquiring taps; which connect with the primary coil of rectiformer in a rectifying-filtering unit (2). The output terminals of the rectifying-filtering unit (2) connect with the control winding (6). A quick switch (K) is in parallel connected with the tertiary winding (7). The on/off state of the quick switch (K) is controlled by the command transmitted by the control unit (4) in the controllable reactor. This invention uses an additional tertiary winding to control the power system through the high speed switch and the control unit in the case of short circuit to meet the quick response when the controllable reactor is in fault. Moreover, this controllable reactor has an excellent obtaining effect and wide applications.