Design and control of three-phase power system with wind power using unifid power quality conditioner (UPQC)

The main focus of this thesis is on one of the new nowadays technologies for Power Quality (PQ) improvement. The Unified Power Quality Conditioner (UPQC) is one of the Custom Power devices (CP) and it mitigates both load current and supply voltage problems (voltage swells, sags, harmonics, etc.) simultaneously. Using CP getting more familiar with renewable energy high penetration on the electrical grid because of its intermitted nature, which causes power flection, also using power electronics devices and non-linear loads produces harmonics which affects the voltage and current waveform. In this thesis, UPQC will be used with a sensitive load that is connected to a grid (grid-wind turbine) power system. UPQC will operate under different disturbances such as phase-to-ground fault, non-linear load on the gird side, and non-linear load in parallel with the sensitive load. Using Pulse Width Modulation (PWM) and hysteresis as switching techniques. Simulation results using MATLAB/Simulink are used to compare the two pulsing generating techniques and show that electrical power is continuously fed to the load in all disturbances with Total Harmonic Distortion (THD) less than 5% for voltage and 4.5% for current.