Indonesian Journal of Electrical Engineering and Computer Science Vol. 11, No. 2, August 2018, pp. 645~651 ISSN: 2502-4752, DOI: 10.11591/ijeecs.v11.i2.pp645-651  645 Journal homepage: http://iaescore.com/journals/index.php/ijeecs Microinverter Topology based Single-stage Grid-connected Photovoltaic System: A Review A. Razi 1 , M. Nabil Hidayat 2 , M. N. Seroji 3 1,2,3 Centre of Electrical Power Engineering Studies, Universiti Teknologi MARA, Shah Alam, Malaysia 1 Power Electronics and Drives Research Group, CeRIA/FKE, Universiti Teknikal Malaysia Melaka, Malaysia Article Info ABSTRACT Article history: Received Feb 1, 2018 Revised Apr 12, 2018 Accepted Apr 27, 2018 This paper discussed the topology development of a single-stage microinverter in grid-connected PV system. In general, the microinverter topologies can be categorized into four type of topologies: 1) Flyback inverter, 2) Double-boost inverter, 3) Derived zeta-cuk configuration and 4) Buck-boost inverter. Flyback configuration is widely used for single-stage microinverter which offers protection between solar panel and utility grid. However due to the bulkiness of the transformer, new arrangement circuit employ the Half-Bridge topology with film capacitor and microcontroller provide a good room for research and future developments to obtain greater efficiency and compact design of single-stage microinverter grid-connected PV system. Plus, there are several characteristics need to be taken care for future development of the microinverter technology. Keywords: Microinverter Solar Photovoltaic Single stage Grid connected Copyright © 2018 Institute of Advanced Engineering and Science. All rights reserved. Corresponding Author: A. Razi, Centre of Electrical Power Engineering Studies, Universiti Teknologi MARA, Shah Alam, Malaysia. Email: atikah@utem.edu.my 1. INTRODUCTION Solar Photovoltaic (PV) system has emerged into resourceful platform for converting the sun radiance from the solar module into sinusoidal output waveform to be used at the electrical appliances. There are two basic approaches at the end of the PV system, either to be connected directly to the load and/or storing in batteries (commonly known as isolated-PV system or stand-alone PV system), or injected to the grid (known as grid-connected PV system). This research works towards isolated-PV system were presented in [1]–[5]. However, there will be an excessive amount of energy when applied to the small application (load or battery) with such lots of extraction power. The incentive by government especially with Feed-in Tariff (FIT), cost effective and less maintenance system leads further developing of grid-connected PV system [6]–[17]. In the grid-connected PV system, magnitude, phase and frequency of the AC signal should be properly synchronous with the grid. Thus the inverter is the crucial component in the PV system. There are three common inverter grid-connected configurations which are: 1) Centralized-inverter, 2) String inverter and 3) Microinverter. The common grid-connected type of PV system is shown in Figure 1. Centralized inverter involves several numbers of solar modules connected in series and parallel configuration which draws a number of drawbacks such as high percentage of losses including high voltage DC cables loss, losses due to centralized maximum power point transfer (MPPT) and power mismatch losses in solar modules due to shading and cloud effects. One failure of the solar module leads to immediate power abruption to the grid, thus reduce the FIT-based income consequently prolong the Return of Investment (ROI) in the future [1], [11], [18]. However the simple structure of centralized inverter make it suitable design for large-scale PV plant producing more than 10 kW up until 1 MW for the three-phase of grid.