Emergency Energy Storage Self-Heating via Internal Resistance
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Solution Overview
Problem
Emergency energy storage devices in wind turbine systems face challenges in achieving operational readiness at low temperatures due to increased internal resistance, leading to reduced drawable energy and peak output, which can result in delayed startup and safety risks during grid failures.
Innovation Solution
The process involves discharging the emergency energy storage device to generate heat and lower internal resistance, using the heat to warm the storage elements, and determining the core temperature through measured physical variables to ensure operational readiness, with optional charging to achieve minimum energy or output values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the emergency energy storage device is used at low temperatures, then the system can operate in cold environments, but the internal resistance increases leading to reduced drawable energy and peak output
Solution Approach 1:
The patent applies parameter changes by heating the energy storage element from a low initial temperature to a higher operating temperature. This is achieved by discharging the energy storage element, which generates heat through internal resistance that raises the core temperature from below 0°C to above 0°C, thereby changing the temperature parameter to reduce internal resistance and improve performance
Solution Approach 2:
The patent converts the harmful effect of internal resistance (which causes energy losses) into a beneficial heating effect. By deliberately discharging the energy storage element, the internal resistance generates heat that raises the core temperature, reducing the resistance and improving the drawable energy and peak output
2Loss of energy
If the emergency energy storage device is heated to reduce internal resistance, then the drawable energy and peak output improve, but time is required for the heating process
Solution Approach 1:
The patent maintains continuity of useful action by using the discharge process itself to generate the heat needed for heating. Instead of a separate heating phase, the discharge and heating occur simultaneously, ensuring that the energy storage element is prepared for operation while minimizing idle time
Solution Approach 2:
The energy storage element heats itself through its own internal resistance during discharge. The system uses its inherent properties to perform the heating function without requiring external heating devices or additional energy input, thereby reducing system complexity and preparation time
3Measurement precision
If the core temperature is determined through measured physical variables, then the operational readiness can be accurately assessed, but the measurement and calculation process adds complexity
Solution Approach 1:
The patent uses physical variables (voltage, current, time) as intermediaries to indirectly determine the core temperature. Instead of directly measuring temperature, the system measures these electrical parameters and calculates the temperature based on the known relationship between them and the internal resistance, simplifying the measurement approach
4Reliability
If the emergency energy storage device is discharged to generate heat, then the internal resistance decreases and operational readiness improves, but energy is consumed during the discharge process
Solution Approach 1:
The patent converts the energy that would be lost as heat through internal resistance into a beneficial heating effect. The discharge process, which normally represents energy loss, is deliberately used to raise the core temperature and improve the operational readiness of the energy storage element
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 quicker and safer operational readiness of wind turbine systems at low temperatures by reducing internal resistance and ensuring sufficient energy is available for emergency operations, reducing downtime and safety risks.
Implementation Method 1
the emergency energy storage (1) is discharged via a discharging device (4) in order to use the heat occurring at the internal resistance Ri during discharging of the emergency energy storage to heat the emergency energy store
Data Source
AI summary
Described and shown is a process for preparing an emergency energy storage device, with at least one energy storage element for operation, whereby the emergency energy store is designed to provide emergency electrical energy for at least one energy consumer, whereby the energy (EL) which can be drawn from the emergency energy storage and/or the peak output (Pmax) which can be drawn from the emergency energy storage is determined and the operational readiness is established as soon as the energy (EL) which can be drawn from the emergency energy storage and/or the peak output (Pmax) which can be drawn from the emergency energy storage has reached a definable minimum energy value. A process for preparing an emergency energy storage device for operation in which the emergency energy storage is discharged via a discharging device and the heat occurring at the internal resistance (Ri) is used to heat the emergency energy storage device.