Abstract
The low frequency oscillation in the electrical generator connect to power grid is an important problem to control systems, especially in the gas turbine generators with high speed. The oscillation makes affect to life time, finance of operating and effect of energy process. There are many cause of the oscillation in governor speed control of power plants. They use PSS to do damping low frequency oscillation in recently [11], [12], [13], [14], [22], [23]. So PSS usually does process with delay cycle time, therefore it makes effect isn’t good result. This paper presents a method using linear in the gas turbine generator, which connects to power grid. By observe affect action of local oscillation of the power, study finds key point of oscillation time. From that, we take out decision to do prediction of damping in system and supply signal in to PSS to reduce damaging of this oscillation. Simulation results explain difference action of the system with linear observer and system without linear observer.
Highlights
The Local Plant Mode Oscillations (LPMO) is a special mode operation of the connection plant to grid systems
The plants connect to grid to loads and make a big power system
The effect of oscillation is propagated to the generator and connected to the grid, which usually occurs when the system has significant power fluctuations such as closing or cutting loads on the grid
Summary
The Local Plant Mode Oscillations (LPMO) is a special mode operation of the connection plant to grid systems. The plants connect to grid to loads and make a big power system. This is a complex circuits system with elements R, L, C and sources. The effect of oscillation is propagated to the generator and connected to the grid, which usually occurs when the system has significant power fluctuations such as closing or cutting loads on the grid. The rest of the system is usually simulated as a constant voltage source whose frequency is thought to remain constant. This is called the Single Machine Infinite Bus model (SMIB). The oscillation can be eliminated by a single or double PSS (Power System Stabilizer) input which supplies the reference voltage regulation of the Automatic Voltage Regulator (AVR) with the appropriate phase and pulse increased compensation [Lee, 1992]
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