Wind Turbine Tap Selection Controller Voltage Regulation
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Solution Overview
Problem
Existing methods for feeding electrical power from wind energy plants into AC voltage networks require expensive reactive power compensation systems to meet quality requirements at the common coupling point, which is inefficient and complex.
Innovation Solution
A method and arrangement that utilize a tap selection controller to adjust the voltage at the output of a wind turbine, using a feed transformer with taps, to achieve the required voltage at the common coupling point, thereby eliminating or minimizing the need for reactive power compensation systems by controlling reactive power through voltage adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reactive power compensation systems with switchable inductances and capacitances are used to meet quality requirements at the common coupling point, then the voltage quality and reactive power requirements are satisfied, but the system becomes very expensive and complex
Solution Approach 1:
The invention changes the operating parameters of the wind turbine by adjusting the voltage at its output through transformer taps. By varying the voltage magnitude and phase angle at the wind turbine output, the system can control the reactive power flow to the coupling point, thereby satisfying voltage quality requirements without complex compensation systems
Solution Approach 2:
The invention uses the wind turbine's output voltage as an intermediary control variable. Instead of directly adding reactive power compensation equipment at the coupling point, the system mediates through the wind turbine's voltage control to achieve the desired reactive power flow and voltage quality at the coupling point
2Power
If expensive reactive power compensation systems are deployed to meet network operator requirements, then the required reactive power can be supplied, but the cost and system complexity increase significantly
Solution Approach 1:
The wind turbine serves itself by controlling its own output voltage to provide the required reactive power to the network. The tap selection controller automatically adjusts the transformer taps based on detected coupling point voltage, enabling the wind turbine to self-regulate and meet network requirements without external compensation equipment
Solution Approach 2:
The system changes the voltage parameters at the wind turbine output to control reactive power flow. By adjusting voltage magnitude through tap selection, the system can supply required reactive power to the coupling point without incurring the costs associated with traditional compensation systems
3Manufacturing precision
If the voltage at the wind turbine output is controlled to achieve predetermined voltage at the common coupling point, then the voltage quality requirements are met, but the control system complexity increases
Solution Approach 1:
The system uses feedback control by detecting the actual voltage at the common coupling point and comparing it with the predetermined target voltage. The tap selection controller uses this feedback information to automatically select appropriate transformer taps, thereby maintaining voltage quality within specified tolerances
Solution Approach 2:
The control system is dynamic and adaptive, continuously monitoring the coupling point voltage and adjusting the transformer taps in real-time. This dynamic adjustment allows the system to maintain precise voltage control despite varying network conditions and wind turbine output
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 approach allows for efficient generation of reactive power at the coupling point with minimal effort, adapting to different operational requirements by selecting appropriate voltage ranges, thus reducing the complexity and cost of reactive power compensation.
Implementation Method 1
a feed transformer which is arranged in the energy transmission path and is provided with taps
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a method for feeding electrical power from a wind turbine (2; 3) via an energy transmission path (8; 9) into an AC voltage network (11) at a common coupling point (10) between the energy transmission path (8; 9) and the AC voltage network (11), wherein the voltage (Uk) at the coupling point (10) is detected and is supplied to a tapping selection regulator (16; 17). Moreover the voltage (Us) at the output of the wind turbine (2; 3) is detected and supplied to the tapping selection regulator (16; 17). On the basis of the magnitude of the detected voltages (Uk, Us), with a feed transformer (14; 15) disposed on the energy transmission path (8; 9) and provided with tappings, tappings are assigned by the tapping selection regulator (16; 17) in such a way that at the output of the wind turbine (2; 3) a voltage (Us) occurs which leads to a predetermined voltage (Uk) at the common coupling point (10). The invention also relates to an arrangement for feeding electrical power from a wind turbine into an AC voltage network.