Power quality and stability improvement of microgrid through shunt active filter control application: An overview

Owing to avoid harmonic and power quality issues, the concept of eliminating their impacts on microgrid systems has gained a lot of interest. Incidentally, shunt active filters (SHAFs) is selected as the most reliable solutions against the concern problems and become the first choice of researchers. However, the performance of SHAF is strictly dependent upon the controller's action, design, and stability. Looking at the necessity, the detailed working of parallel/series filters for current and voltage source-based non-linear load application is discussed and compared. This paper reviews and collects information related to various SHAF control techniques for improving microgrid performances. The effectiveness of the controller is examined and justified by considering the non-linearity reduction, dc-link voltage balancing, current and voltage regulation, and improving the synchronization techniques. In this review, the most advanced control techniques are discussed and contrasted systematically to highlight their strengths and weaknesses. In addition to that, by considering different control architectures, the possible control outcomes and shortfalls are also summarized in different tabular forms. The survey can hypothetically serve as a standard and establishment of material for selecting the most significant methods for smoothening the SHAF operation for complex microgrid systems.