Advanced power electronic for wind-power generation buffering.

摘要

As the cost of installing and operating wind generators has dropped, and the cost of conventional fossil-fuel-based generation has risen, the economics and political desirability of more wind-based energy production has increased. High wind-power penetration levels are thus expected to augment in the near future raising the need for additional spinning reserve to counteract the effects of wind variations. This solution is technologically viable, but it has high associated costs. Our study presents a different solution to short-term wind-power variability, using advanced power electronic devices combined with energy-storage systems. New control schemes (designed to filter power swings with a minimum of energy) were designed, modeled and verified through experimental tests. We also determined the procedure to extract the corresponding per-unit model parameters for simulations and test purposes.; We first reviewed D-Q transformations with emphasis on modeling of the system and control algorithm. System components were then designed using criteria similar to those used to design medium-voltage power products.; We tested a proof-of-concept for performance of the power converter in a scaled-down isolated system using real wind-power data. Tests were conducted under realistic system conditions of wind-penetration level and energy-storage levels, to better characterized the impacts and benefits of the Power Stabilizer. We described the scaled-down isolated electric power system used in the testing. We also analyzed the performance of the wind-farm model and the synchronous machine's governor to gain an insight into the model system's limitations.; Simulation results carried out in Mathematical Laboratory (MATLAB) and Power Systems Computer Aided Design (PSCAD) were compared to experimental data to verify the performance of the power converter under different system conditions and algorithms. Power limiters were also contrasted and evaluated for frequency deviations and attenuated power fluctuations.; In summary we can say that, among all the power limiters considered in our study, the adaptive high pass filter presented the best performance in terms of system robustness and effectiveness.