Abstract:
This thesis proposes the analysis of voltage stability in power system in case of the connection between wind turbine power plant and EGATYS LAM TA KHONG hydro power plant, before actual installation. The study focuses on the voltage stability and voltage variation in power system that effects to the operation of wind turbine power plant.
Generally, the voltage stability keeps every voltage buses in power system constant. The automatic generation control (AGC) was the system that supplied the electrical power and controlled stability of frequency, electrical voltage to keep the minimum variation in power system by connecting the Flexible AC Transmission System (FACTs) to the buses system to automatically control the reactive power. The voltage stability and AGC were studied in this thesis using
MATLAB/PSAT environment.
The simulation results showed that the analysis of voltage stability of power system with wind turbine 20.5 MW by connecting the STATCOM to the power system gave higher voltage stability than the power system which connected to the SVC. The active and reactive power of total generation is 13.1854p.u. and 15.7333p.u., respectively. The AGC has fluctuated to desynchronizes with 1 MW 0.5 MVAR load capacity. The similar results were found, the system which connected to the STATCOM also showed higher voltage stability than the SVC system. The active and reactive power of total generation is 0.05016p.u. and 0.03773p.u., respectively. The frequency variation is .2.10Hz.