In the network communication, communication systems require multiple tasks simultaneously and independently, and each task needs constantly performing before termination in normal. In order to meet the demand, put forward the multi-channel thread method in communication process. Based on TCP / IP protocol socket network communication, in order to make the server effectively distinguish between multiple client task and accurate transmission of information, using multi thread method processing communication details, ensure the separate and concurrent of communication between each node and server. Deep understanding and flexible use of thread method to the communication process is the key to network communication.
The method to analysis the advantages of S Function and Auto-Disturbance-Rejection Control(ADRC)[1]. Basing on the MATLAB/SIMULINK as the simulation platform, three function blocks were constructed adopting the S Function and the subsystems’ encapsulation was realized as well according to the discrete algorithm of the Nonlinear State Error Feedback(NLSEF), the Tracking Differentiator(TD) and the Extended State Observer(ESO). By conducting the simulation example of the main steam temperature control system in a certain thermal power plant, the correctness and the effectiveness of the ADRC have been demonstrated.
For the low pressure (LP) cylinder of a steam turbine, computation of the exhaust enthalpy is an important part in thermal power generating unit performance monitoring. A new online model for calculating the exhaust enthalpy was proposed aiming at the limitation of existing online calculation model for calculating the enthalpy of steam turbine LP cylinder exhaust steam. This model treats LP cylinder, condenser and corresponding heater as an open system, according to the energy balance equation of this open system, figuring out its exhaust enthalpy. Calculation results of typical steam turbine show that: in a large load change range, the results are close to thermal experimental value, the accuracy is similar to energy balance method.
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