Providing a Robust Control Technique for Stable AC/DC Hybrid Microgrids Operation of Using Intelligent Algorithms under Varied Loading Conditions

In the last two decades, the quality of electrical power has attracted increasing attention from power companies and subscribers. Power quality and robust control are a pervasive concept for various types of power system and microgrids disturbances. In recent years, conventional methods for improving power quality have been proposed including the use of active, passive or hybrid filters with inverters. The harmonics in the power system have increased with the growth of nonlinear loads on the microgrid, so that if they are ignored, the voltage of the distribution system and the performance of many industrial equipment, including induction motors, capacitors, etc. will affect. One of the solutions for reducing harmonics in power system is the use of passive and active filters based on multilevel inverters. The biggest drawback of passive filtering is the possibility of resonance that has been resolved by the introduction of active filters. At this stage, the dynamics inactivity theory applies state variables errors to convergence of zero values with respect to the injected impedance and resistance to d-q component currents of inverters and used AC/DC converters. Due to the wide range of use of power converters due to their application in microgrids, the use of multilevel inverter-based active filters to eliminate harmonic effects has always been a concern. Therefore, in this study, we introduce the Parallel Active Filter and its various control methods based on the evolutionary multilevel inverter and provide a harmonic compensator (harmonic reduction) of the Parallel Active Filter with the help of fuzzy PID controller.

Keywords:

Microgrid , Harmonic and Resonant Reduction , Multilevel Inverters , Robust Fuzzy PID Controllers , Parallel Active Filters