Component-based Multi-mode System Analysis And Design For Complex Power Generation Process

Generally speaking,power generation processes have complex system structure and numerous sectors refer to energy conversion.There are multiple operation modes during the full working range of power generation processes.Take combustion equipment,heat engine in fossil energy power generation process and electromechanical device,reaction unit in renewable energy power generation as examples,their operation modes and connection relationship with other devices would change during the full working range,which could bring influence on control quality of process control loop and operation performance of whole system.The component-based multi-mode modeling and timing analysis methodology proposed in the thesis is trying to solve the analysis and optimization problems of mode switch systematically and normatively.The main research contents are summarized as follows:(1)The component-based multi-mode modeling and timing analysis methodology is given based on the intensive analyze of multi-mode characteristic.The methodology includes three parts:component-based mode-aware model,mode switch strategy and mode switch timing analysis.The methodology provides a systematic and normative research program for the analysis and optimization problems of mode switch.The component-based mode-aware model shows the interactive relationship of all components in different modes clearly.The component-based timing analysis method could analyze mode switch performance from time statistics perspective.(2)In order to verify the feasibility and effectiveness of the proposed methodology,a case study based on 1.5MW variable-pitch wind turbine standard model is given.First,component-based mode-aware model for wind turbine system is built and timing analysis for all mode switch processes are given.Then,the optimization for pitch sub-system of generation-break mode switch process is provided,which process has the optimal most potential.In order to improve the control performance during the whole working range,the fuzzy self-tuning multi-mode PID controller is designed for pitch sub-system.(3)To demonstrate the feasibility of proposed methodology in industry practice,a series of experiments based on the simulator of 300MW circulating fluidized bed(CFB)unit are designed.Component-based mode-aware model for the air-gas system of CFB unit is built,and the timing analysis of ignition preparation to completion and ignition completion to coal feeding startup mode switch processes are given.Via OPC protocol,the air-gas system timing analysis procedure based on LabVIEW realized time statistic for the two mode switch processes automatically.