Wind Turbine Voltage Bounding Range for Grid-Adaptive Control
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Solution Overview
Problem
Conventional wind turbine systems face challenges in maintaining optimal voltage control, particularly in changing grid characteristics, which can lead to saturation of the wind turbine voltage controller and unsatisfactory performance.
Innovation Solution
A method for determining a customized voltage bounding range for the wind turbine reference voltage, taking into account the electrical characteristics of the transmission line, including impedance, capacity, inductance, and transformation ratios, to prevent controller saturation and ensure stable voltage control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed voltage bounding range is applied to the wind turbine reference voltage, then the control system is simple to implement, but the wind turbine controller becomes saturated in certain conditions leading to unsatisfactory performance
Solution Approach 1:
The patent applies dynamics by transforming the fixed voltage bounding range into a dynamic, adaptive range. The voltage bounding range is no longer static but adjusts automatically based on real-time grid characteristics and transmission line parameters. This allows the controller to maintain optimal performance across varying operating conditions without saturation, resolving the contradiction between simplicity and reliability.
Solution Approach 2:
The invention changes the parameters of the voltage bounding range dynamically. Instead of using fixed parameter values, the system continuously updates the voltage bounding range parameters based on measured grid characteristics and transmission line data. This parameter adaptation enables the controller to avoid saturation while maintaining operational simplicity through automated adjustment.
2Reliability
If a customized voltage bounding range is determined based on transmission line electrical characteristics, then controller saturation is prevented and voltage control is improved, but the system complexity increases
Solution Approach 1:
The system applies self-service by enabling the voltage control system to automatically determine and adjust its own voltage bounding range based on measured transmission line characteristics. The controller performs self-diagnosis and self-adjustment without requiring external intervention or complex manual configuration, thereby improving reliability while minimizing the increase in operational complexity.
Solution Approach 2:
The invention implements feedback mechanisms where the system continuously monitors grid characteristics and transmission line parameters, then uses this information to adjust the voltage bounding range. This closed-loop feedback approach ensures reliable voltage control and prevents controller saturation, while the automated nature of the feedback process keeps the added system complexity manageable.
3Device complexity
If the wind turbine voltage controller operates with a fixed voltage range, then the control algorithm is simple, but the system cannot adapt to changing grid characteristics leading to saturation
Solution Approach 1:
The patent transforms the static control algorithm into a dynamic one that automatically adapts to changing grid characteristics. The voltage bounding range becomes a dynamic parameter that adjusts in real-time based on grid conditions and transmission line characteristics, enabling the simple control algorithm to maintain adaptability without increasing its inherent simplicity.
Data Source
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AI summary
It is described a method for determining a voltage bounding range (125) defining a range of a wind turbine reference voltage (123) for a wind turbine (101) for controlling an output voltage (Vturb) of the wind turbine at a wind turbine output terminal (113), the method comprising: obtaining information regarding an electrical characteristic of a transmission line (106) connecting the wind turbine output terminal (113) to a point of common coupling (111) to which plural other wind turbines are connectable; and defining the voltage bounding range (125) based on the electrical characteristic of the transmission line (106).