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In this paper, the model of centrifugal compressor driven by turbine is built up. Comparing with the centrifugal compressor driven by motor which has the steady speed, system in this paper can be governed not only by anti-surge valve but also by speed of turbine. The purpose of this paper is system simulation and to design PID controller governing this system to meet the needs of the pressure ratio...
The effect on system stability of load shedding has been a popular research topic for many years, especially in an islanded power system. But seldom studies gave full considerations to the actions of Primary Frequency Regulations (PFRs) and Overspeed Protection Control (OPC) systems of the generation units, which may have great impacts on the system responses against disturbances or emergency situations...
Model simulations are becoming more important in dynamic power system analyses as our increasing dependence on electricity supply. However, the general steam models often show some disadvantages in dynamical cases. No enough attention is paid to the non-linear relationships between flow rate and pressure differences. The paper puts forwards a new nonlinear turbine model taking the nonlinearities into...
Classic combined cycle power plant models are often too complex for power system dynamic analysis, and hard to estimate the parameters accurately. The performances of parameter identification procedures have been significantly reduced by high-dimensional searches and strong nonlinear relationships. A new non-linear model is proposed to be suitable for the parameter identification procedure in this...
Accuracy parameters of system model are of great importance in stability and security evaluation or simulation for power system. Some of the conventional methods may have inadequate adaptability or effectiveness for identification of different power systems. A new framework for power system identification is proposed based on an improved genetic algorithm with a logarithmic fitness function and an...
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