Power Oscillation Damping Controller for Wind Turbines
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Solution Overview
Problem
Existing power generation systems face inefficiencies in damping power oscillations within electricity networks, which can lead to unstable conditions and potential system blackouts due to insufficient damping of inter-area oscillations.
Innovation Solution
A controller for power generation devices that processes oscillation indicating signals through a signal processing chain, including filters, phase-shifting units, and limiting units, to generate damping control signals that effectively target and reduce power oscillations within specific frequency ranges, allowing for efficient damping of inter-area oscillations without the need for pre-configured sensors or specific oscillation indicating signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter is added to the signal processing chain to select predetermined frequency ranges, then the controller can effectively target and damp specific power oscillations, but the device complexity increases
Solution Approach 1:
The patent applies parameter changes by introducing a filter that selectively passes signals within a predetermined frequency range. This filter modifies the frequency parameter of the oscillation indicating signal, allowing the controller to target specific power oscillation frequencies (typically 0.1-2.0 Hz) while blocking other frequencies. The filter transforms the raw oscillation signal into a frequency-selective control signal that effectively damps inter-area oscillations without requiring complex multiple sensors.
2Measurement precision
If pre-configured sensors are used to detect specific oscillation signals, then the measurement precision improves, but the adaptability to different oscillation frequencies and network conditions deteriorates
Solution Approach 1:
The patent applies universality by designing a filter-based signal processing chain that can handle multiple oscillation frequencies within a predetermined range (0.1-2.0 Hz) using a single oscillation indicating signal. The filter is configured to pass the frequency range where inter-area oscillations typically occur, making the controller adaptable to different oscillation modes and network conditions without requiring separate pre-configured sensors for each frequency. This universal approach allows the same controller to effectively damp various types of power oscillations.
Data Source
AI summary
A power oscillation damping controller is provided for a power generation device such as a wind turbine device. The power oscillation damping controller receives an oscillation indicating signal indicative of a power oscillation in an electricity network and provides an oscillation damping control signal in response to the oscillation indicating signal, by processing the oscillation damping control signal in a signal processing chain. The signal processing chain includes a filter configured for passing only signals within a predetermined frequency range.