Exciter Controller for Gas Turbine Transient Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In power generation systems, there is a mismatch in the speed of the turbine shaft and the frequency output of the generator during transient grid events, leading to potential instability and trips, as the turbine controller struggles to adjust the turbine shaft speed in sync with the grid frequency changes.
Innovation Solution
An exciter controller monitors electrical properties and determines mechanical power on the shaft, communicating this information to a turbine controller to update a model-based control program, allowing for timely adjustments in the turbine's operation to maintain stability between grid properties and shaft rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the turbine controller adjusts the turbine shaft speed to match grid frequency changes during transient events, then the stability between shaft rotation and grid properties is improved, but the response time and ability to keep up with abrupt frequency changes deteriorates
Solution Approach 1:
The exciter controller proactively determines mechanical power on the shaft and communicates this information to the turbine controller before the turbine controller can independently detect and respond to the transient event. This preliminary provision of critical data enables the turbine controller to anticipate required adjustments and act more quickly, resolving the contradiction between maintaining stability and responding rapidly to frequency changes.
Solution Approach 2:
The exciter controller serves as an intermediary between the generator's electrical properties and the turbine controller. It monitors electrical properties, determines mechanical power on the shaft, and translates this information into actionable data for the turbine controller. This intermediary role accelerates information flow and enables faster coordinated response between the generator and turbine during transient events.
2Stability of the object's composition
If the turbine controller monitors and responds to grid frequency changes in real-time, then the system stability is improved, but the complexity of the control system increases
Solution Approach 1:
The exciter controller combines the functions of monitoring electrical properties, determining mechanical power on the shaft, and communicating this information to the turbine controller into a single integrated component. This merging eliminates the need for the turbine controller to independently perform all these functions, reducing overall control system complexity while maintaining system stability through coordinated control.
Solution Approach 2:
The exciter controller performs multiple functions: it monitors electrical properties of the generator, determines mechanical power on the shaft, and provides this information to the turbine controller. This multi-functionality consolidates control tasks into a single device, reducing the number of separate components needed and simplifying the overall control architecture while ensuring stable operation during transient events.
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A method may involve monitoring (52) a first set of electrical properties associated with an electrical grid (24) configured to couple to a generator (14) and determining whether a transient event (54) is present on the electrical grid (24) based on the first set of electrical properties. The method may also involve determining (56) a mechanical power present on a shaft of the generator (14) based on a second set of electrical properties associated with the generator (14), the electrical grid (24), or both when the transient event is present and sending the mechanical power to a controller (26) associated with a turbine (12) configured to couple to the generator (14), wherein the controller (26) is configured to adjust one or more operations of the turbine (12) based on the mechanical power.