Title: Bi-directional power flow control with improved power quality using intelligent controller for AC-DC coupled hybrid micro-grid system
Authors: C. Nagaraj; K. Manjunatha Sharma
Addresses: Department of Electrical and Electronics Engineering, N.I.T.K Surathkal, P.O. Srinivasnagar, 575025, Mangaluru, Karnataka, India ' Department of Electrical and Electronics Engineering, N.I.T.K Surathkal, P.O. Srinivasnagar, 575025, Mangaluru, Karnataka, India
Abstract: Grid connected renewable sources are affected by harmonic distortion due to non-linear power electronics interfaces. Depending upon the nature of the load, many conversion stages are incorporated in the micro-grid which leads to increase in the losses. Therefore, in this paper, the AC-DC coupled hybrid micro-grid system is presented in which AC renewable sources and AC loads are connected to AC sub-grid and DC renewable sources and DC loads are connected to DC sub-grid. The shunt active power filter based 3φ 4-leg bi-directional intermediate converter using d-q load current technique is proposed to achieve the power flow between AC and DC sub-grids. The MATLAB simulation is carried out, and the performance of the proposed system is analysed using the d-q load current technique based fuzzy logic and PI controller. The obtained results demonstrate that the overall system performance is improved with the d-q load current technique based fuzzy logic controller.
Keywords: bi-directional intermediate converter; BIC; common coupling point; CCP; coupled hybrid micro-grid; CHM; hysteresis-based current technique; shunt active power filter; SAPF.
International Journal of Power Electronics, 2021 Vol.14 No.2, pp.156 - 179
Received: 01 Aug 2018
Accepted: 03 Feb 2019
Published online: 13 Jul 2021 *