During the development of a gas turbine controller, it's common for the controller system to advance much faster than the physical turbine itself. Waiting for the full completion of the turbine body before starting the controller's on-line testing can significantly extend the overall project timeline and leave critical control performance unverified, increasing technical risks during the testing phase. To address this, semi-physical simulation tests are conducted once the controller’s hardware and software are developed. These tests provide an effective way to validate the control system design before real-world implementation. A gas turbine typically consists of several major components, including the generator, compressor, turbine, combustion chamber, and regenerator. Each plays a crucial role in the overall operation and efficiency of the system. The integration of these parts requires precise control and coordination, especially during start-up and operation. At the beginning of the turbine’s start-up process, the motor is engaged via a soft starter unit, which helps accelerate the turbine smoothly. Once the ignition speed is reached, the controller activates the ignition nozzle, fuel shut-off valve, and regulating valve to initiate the combustion process. This step is critical for ensuring a safe and efficient ignition sequence. Once the ignition is successful, the turbine begins to generate power, and the generator starts to assist in further accelerating the turbine. This phase is referred to as "double-dragging." During this time, the control system continuously monitors the generator's starting current. When the current drops below a certain threshold, the motor drive circuit is automatically disconnected. From this point, the turbine continues to run independently at idle speed, marking the end of the start-up phase. To enhance the thermal efficiency of the gas turbine across different power levels, variable power and variable speed control strategies are often employed. The control system adjusts the turbine's speed based on load changes, optimizing its performance under varying operating conditions. This dynamic approach ensures that the turbine operates at peak efficiency while maintaining stability and reliability.
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