Steam Turbine Section Control for Flexible Load and Stress Management
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Solution Overview
Problem
The fixed structure of steam turbine controllers limits flexibility in operation, making it difficult to adapt to varying market requirements and physical boundary conditions, especially in terms of power, frequency, and thermal stress management.
Innovation Solution
Implementing individual part-turbine controllers for each section of the steam turbine, allowing independent regulation of power, pressure, and thermal stresses, with PID controllers managing turbine valves to operate in different modes such as power control, frequency control, and thermal stress management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed controller structure is used, then the device complexity is reduced, but the adaptability to different operating modes and market requirements deteriorates
Solution Approach 1:
The patent divides the steam turbine control system into multiple independent partial turbine controllers (3a, 3b, 3c), each responsible for controlling specific turbine stages. This segmentation allows each controller to operate independently with its own set of process variables and control strategies, enabling the system to adapt to different operating modes without requiring complex reconfiguration of the entire control structure.
2Adaptability or versatility
If individual partial turbine controllers are implemented for each turbine stage, then the adaptability to different operating modes improves, but the device complexity increases
Solution Approach 1:
The patent implements universal partial turbine controllers that can operate in multiple operating modes (power control, frequency control, speed control, pressure control) depending on the operational requirements. Each controller is designed to handle different control tasks and can be configured for various functions, reducing the need for multiple specialized controllers and thereby limiting the increase in overall system complexity.
3Ease of manufacture
If a fixed controller structure is used, then the ease of manufacture is improved, but the ease of operation deteriorates due to limited flexibility in responding to boundary conditions
Solution Approach 1:
The patent enables dynamic reconfiguration of control parameters and operating modes for each partial turbine controller based on real-time boundary conditions and operational requirements. The controllers can adapt their control strategies, setpoints, and regulated variables dynamically, allowing the system to respond flexibly to changing conditions without requiring physical reconfiguration or complex manual adjustments.
Data Source
AI summary
The invention relates to a method for operating a steam turbine (1). The steam turbine (1) has at least two sub-turbines (2a, 2b, 2c, 5), wherein the steam turbine (1) is paired with a steam turbine controller (3) which has a sub-turbine controller (3a, 3b, 3c) for each of the sub-turbines (2a, 2b, 2c), and each sub-turbine controller (3a, 3b, 3c) compares respective target values with respective actual values of the respective sub-turbine (2a, 2b, 2c, 5) during operation in order to determine a respective control deviation for each sub-turbine (2a, 2b, 2c, 5).