Phase Angle Control With Delay Function For Grid Oscillation Damping
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Solution Overview
Problem
Generators in electrical supply grids face challenges in controlling voltage fluctuations due to variations in real power supply, which can lead to oscillations and instability, particularly in weak grids.
Innovation Solution
Implementing a phase angle control method with a delay function characterized by a time constant to manage reactive power, allowing for gentle system responses and minimizing overshooting, thereby stabilizing grid voltage and frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If phase angle control reacts immediately to grid voltage changes, then the response speed is improved, but the system amplifies oscillations and causes voltage instability
Solution Approach 1:
The patent applies periodic action by introducing a delay function with time constants that creates a controlled temporal pattern in the phase angle adjustment. Instead of immediate continuous adjustment, the system uses delayed periodic responses to grid voltage changes, allowing oscillations to dampen naturally while maintaining stable voltage regulation over time.
2Power
If phase angle control adjusts rapidly to support frequency, then frequency support is improved, but the system overshoots and amplifies grid oscillations
Solution Approach 1:
The patent implements beforehand cushioning by using the delay function to anticipate and prepare for power adjustments. The time constants are configured to cushion the system response before actual power adjustments occur, preventing overshooting by gradually building up the control signal in advance rather than applying abrupt changes.
3Power
If the generator supplies reactive current to support voltage, then voltage support is improved, but the system causes voltage drops and frequency falls during load connection
Solution Approach 1:
The patent applies dynamics by making the reactive power supply adjustable and time-dependent through the delay function. The system dynamically adapts the reactive current magnitude and timing based on grid conditions, switching between under-excited and over-excited operation modes to provide appropriate support without causing voltage drops or frequency falls.
Data Source
AI summary
A method for supplying electric power to an electrical supply grid that has a grid rated voltage and is operated at a grid voltage, wherein the supplied electric power has a reactive power component that is prescribed by a phase angle describing an angle between a current and a voltage of the supplied electric power, wherein the phase angle is set by means of phase angle control that has a delay function characterized by at least one time constant.