Wind Power Plant Voltage Stabilization via Idle Power Injection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wind power plants face challenges in protecting their electrotechnical components from excessive grid voltages, which can lead to damage during voltage transients, and existing methods do not effectively manage voltage stabilization and separation from the grid in a timely manner.
Innovation Solution
A method for operating a wind power plant with a rotor-driven electric generator that monitors excess voltage and feeds idle power to the grid to lower voltage, using a regulator to adjust power coefficients and phase angles, and employs an uninterruptible power supply to protect sensitive components, allowing for timely separation from the grid to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If idle power is fed to the grid to lower voltage during excess voltage conditions, then voltage stabilization is improved, but the risk of component damage from prolonged exposure to excess voltage increases
Solution Approach 1:
The patent implements a monitoring device that continuously monitors grid voltage and provides feedback to the control device. When excess voltage is detected, the control device adjusts the phase angle of the idle power fed to the grid to stabilize voltage. The system monitors whether voltage is lowered to a reference value within a predeterminable time and triggers separation if the condition is not met, creating a closed-loop feedback control system that balances voltage stabilization with component protection.
2Reliability
If separation from the grid is triggered early to protect components, then component protection is improved, but productivity is reduced due to unnecessary disconnections
Solution Approach 1:
The patent applies preliminary action by preparing the system for potential excess voltage conditions in advance. The monitoring device is continuously active, and when excess voltage is detected, the system immediately begins feeding idle power with adjusted phase angles to lower voltage before component damage can occur. This preliminary protective action allows the system to maintain operation longer than traditional methods while still protecting components.
Solution Approach 2:
The system dynamically adjusts the phase angle of the idle power fed to the grid based on real-time voltage conditions. The control device modifies the phase angle to optimize voltage stabilization while monitoring whether the voltage reaches the reference value within the predeterminable time. This dynamic adjustment allows the system to adapt to changing grid conditions and maintain operational continuity while protecting components.
3Reliability
If the monitoring time for voltage reduction is extended, then false separation triggers are reduced, but the exposure time to damaging voltage levels increases
Solution Approach 1:
The patent changes the parameter of monitoring time to a predeterminable value that is optimized to prevent false separation triggers while limiting exposure to damaging voltage levels. The system monitors whether voltage is lowered to a predeterminable reference value within this predeterminable time. By carefully selecting this time parameter, the system balances the need to prevent false triggers with the need to limit damage exposure, avoiding both premature and delayed separation.
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 effectively reduces voltage loads on wind power plant components, ensures prolonged operation without damage, and requires minimal component adaptation, providing robust protection against high voltage transients and prolonged excess voltage conditions.
Implementation Method 1
idle power from the wind power plant is fed to the grid in order to lower the voltage
Implementation Method 2
the phase angle phi is changed dependent on the level of at least one voltage measured on the grid
Data Source
AI summary
A method is provided for operating a wind power plant (15-19) with a rotor-driven (25-29) electric generator (30) for delivering electric power to an electric grid (31) which provides a grid voltage in which, when excess voltage prevails in the grid (31), idle power from the wind power plant (15-19) is fed to the grid (31) in order to lower the voltage. A wind power plant is provided (15-19) with a rotor-driven electric generator (30) for delivering electric power to an electric grid (31) in which when excess voltage prevails in the grid idle power from the wind power plant (15-19) is fed to the grid (31) in order to lower the voltage. Monitoring occurs to determine whether within a predeterminable time a voltage was lowered to a predeterminable reference value and/or an idle current is delivered which is greater than or equal to a predeterminable idle current reference value.