Title :
A unified power controller for photovoltaic generators in microgrid
Author :
Du Yan ; Jianhui, Su ; Yong, Shi
Author_Institution :
Photovoltaic Syst. Res. Center of Educ. Minist., Hefei Univ. of Technol., Hefei, China
Abstract :
The non-dispatchable energy output of PV generators has an adverse effect on the stability of microgrid especially capacity-limited microgrid with high PV penetration. To solve this problem, a unified power control strategy for PV generators is proposed to mimic the performance of synchronous generator (SG) in power system. As a supplementary supply, fuel cell is equipped in the PV generator to reduce the DC voltage ripple and supply a virtual electrical inertia as well. This proposed PV generator is regulated by the conventional control algorithm for SG so that it can contribute to the voltage and frequency regulation in an islanded microgrid while it can correct power factor when the microgrid connects to the utility. This control strategy for PV generators has been verified by the simulation study. The simulation results show that it has excellent performance in tracking the maximum solar power, participating voltage and frequency control, sharing the load and correcting the power factor.
Keywords :
distributed power generation; frequency control; fuel cells; machine control; photovoltaic power systems; power control; power factor correction; power grids; power system stability; synchronous generators; voltage control; DC voltage ripple; PV penetration; capacity limited microgrid; conventional control algorithm; fuel cell; nondispatchable energy output; photovoltaic generator; synchronous generator; unified power control strategy; unified power controller; virtual electrical inertia; Frequency control; Fuel cells; Generators; Mathematical model; Power system stability; Reactive power; Voltage control; VSI; inertia; microgrid; photovoltaic;
Conference_Titel :
Electric Utility Deregulation and Restructuring and Power Technologies (DRPT), 2011 4th International Conference on
Conference_Location :
Weihai, Shandong
Print_ISBN :
978-1-4577-0364-5
DOI :
10.1109/DRPT.2011.5994063