Wind Turbine Heating Circuit With PWM for Stable Ice Mitigation
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Solution Overview
Problem
Wind turbines operating in remote and extreme weather locations face challenges in maintaining consistent power levels for ice mitigation systems due to limitations in power devices, leading to potential temperature cycling and electromagnetic compatibility issues.
Innovation Solution
A heating system with a heating circuit that receives a voltage signal from the electrical grid, processes it using pulse width modulation (PWM) and integral cycle control (ICC) to maintain a stable temperature range for heating elements, reducing harmonics and electromagnetic emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional heating systems are used in wind turbines, then ice mitigation can be achieved, but temperature cycling occurs and electromagnetic compatibility issues arise
Solution Approach 1:
The patent applies periodic action by using pulse width modulation (PWM) to switch the heating element on and off in controlled cycles. The controller adjusts the duty cycle of the PWM signal to maintain the heating element temperature within a specified range, preventing overheating while ensuring effective ice mitigation. This periodic control eliminates temperature cycling issues and reduces electromagnetic interference compared to conventional continuous or simple on-off heating systems.
2Object-affected harmful factors
If heating power is increased to prevent ice in extreme weather, then ice mitigation effectiveness improves, but temperature control stability deteriorates
Solution Approach 1:
The patent implements feedback control by using a temperature sensor to continuously monitor the heating element temperature and comparing it with the desired temperature range. The controller adjusts the PWM duty cycle based on this feedback to maintain stable temperature control. When the temperature approaches the upper limit, the controller reduces power; when it approaches the lower limit, the controller increases power. This feedback mechanism ensures both effective ice mitigation and stable temperature control even in extreme weather conditions.
Solution Approach 2:
The patent applies dynamics by making the heating system adaptable to changing conditions. The controller dynamically adjusts the PWM duty cycle in real-time based on temperature feedback and operating conditions. The system can operate at different power levels depending on the ice mitigation requirements and environmental conditions, providing both high power when needed for ice prevention and stable temperature control when operating within the optimal range.
3Device complexity
If simple on-off control is used for heating elements, then device complexity is reduced, but temperature control precision deteriorates
Solution Approach 1:
The patent uses periodic action through PWM control to achieve precise temperature regulation without excessive complexity. Instead of simple on-off control, the system applies high-frequency switching with variable duty cycles to modulate the average power delivered to the heating element. This approach provides fine-grained temperature control precision while keeping the control circuit relatively simple, using standard PWM controllers and sensors that are widely available and cost-effective.
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 system provides continuous temperature control to heating elements, minimizing temperature cycling and improving reliability while reducing harmonics and electromagnetic interference, ensuring efficient operation in extreme conditions.
Implementation Method 1
providing continuous temperature control to at least one heating element of the heating system via the PWM signal
Data Source
AI summary
A method of operating a heating system of a wind turbine connected to an electrical grid. The method includes receiving, via a heating circuit of the heating system, a voltage signal from the electrical grid. The method also includes processing the voltage signal using the heating circuit of the heating system. Processing the voltage signal using the heating circuit of the heating system includes superimposing a pulse width modulation (PWM) signal onto the voltage signal. Further, the method includes providing continuous temperature control to at least one heating element of the heating system via the PWM signal from the heating circuit. In addition, the method includes maintaining a temperature of the at least one heating element within a temperature range using the PWM signal during operation of the wind turbine to minimize temperature cycling of the at least one heating element.