Abstract
In this paper, the performance of Permanent Magnet Synchronous Generator (PMSG) -based Variable Speed Wind Turbine Generator (WTG) at Adama Wind Farm I (WTG), connected to a grid is studied. To study the performance of the WTG, both machine and grid side converters are modeled and analyzed very well. On the machine side, maximum power point tracking (MPPT) for maximum energy extraction is done using the direct speed control (DSC) technique, which is linked with the optimal tip speed ratio for each wind speed value considered. On the grid side, dc-link voltage and reactive power flow to the grid are controlled. For this purpose, first, the simulation model of the system is prepared in MATLAB Simulink considering the dynamic mathematical model of the PMSG, and Wind Turbine Aerodynamic model using the user-defined function blocks. Then, the PI regulators designed for direct speed, torque (current) control, and dc-link voltage are employed in the model. Moreover, to study and analyze the behavior of the system in a variable speed operation, a wind speed starting from cut-in wind speed (3m/s) to the rated wind speed (11m/s) is applied in 4s. The simulation result of the existing system model shows that the actual values of performance variables correspond well with the analytical values of the system. In addition, the chosen control algorithms applied in the control system of the generator-side converter are hence verified.
Highlights
Ethiopia has around 4238 MW installed power generation capacity
ZDC is generally recommended for non-salient pole Permanent Magnet Synchronous Generator (PMSG)-based Wind Turbine Generator (WTG) and UPF scheme which has limited operating range
maximum power point tracking (MPPT) with optimal tip speed ratio and ZDC scheme control technique are considered to model and study the performance of the grid connected PMSG- based WTG of Adama Wind farm I
Summary
Ethiopia has around 4238 MW installed power generation capacity. Out of which, about 90% (3807 MW) is from hydroelectric power and about 7.65% (324 MW) is from wind energy. ZDC is generally recommended for non-salient pole PMSG-based WTG and UPF scheme which has limited operating range. MPPT with optimal tip speed ratio and ZDC scheme control (since the generator used in the wind farm is non-salient pole type) technique are considered to model and study the performance of the grid connected PMSG- based WTG of Adama Wind farm I. Determined the expression for stator terminal voltage of salient pole PMSM with Ld, and Lq inductance in the dq0 rotating frame, applied again Park transformation on equation 3, Vd. the active and reactive power of the machine at α-β-0 stationary reference frame and d-q-0 synchronously rotating reference is determined using the equations given below (Wu et al, 2011, Abu-Rub et al, 2014)
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