Single phase matrix converter for residential grid-connected photovoltaic systems

PV Sys Proposal

Bidirectional Converter for Residential Grid Connected PV System Using SPMC Topology

The proposed research will focus on the development and implementation of a Single Phase Matrix Converter (SPMC) for use in a standard residential grid-connected photovoltaic (PV) system. This will create a cost savings for the overall system, streamline operation, and simplify use of the system. The SPMC will allow a single switching unit to regulate the flow of electricity to the grid and to the battery in a typical PV system setup, providing the necessary bidirectional flow in a simpler manner than is currently available.

Overview of Previous Research

A number of engineering solutions have been proposed and implemented for the conversion and flow direction changes needed in a standard PV system, and typically increases in performance have been coupled with increases in the complexity of the solutions/systems installed (Seminar, 2011). Other systems are currently being research and in some cases applied in practical situations, however, that achieve high performance results with simplified converter/directional control setups or devices (Shiji et al., 2003; Zhang, 2008; Hamzah et al., 2006). Combined converter devices such as a boost&buckboost converter, allowed for bidirectional soft switching with a 97.1% forward power flow, demonstrating the potential for higher performance through simpler means (Shinji et al., 2003). A major problem with many attempts to simplify the control devices bidirectional conversions are the emergence of spikes or peaks in flow, which must be controlled or eliminated in order to operate efficiently; work in this area with technologies other than the proposed SPMC has provided valuable insight into some of the problems that might be faced as well as potential solutions (Zhang, 2008). Research into SPMCs themselves is still relatively scant, however simulations and limited experiments have suggested that their use has the potential to drastically simplify conversion and flow change achievement without undue efficiency loss (Hamzah et al., 2008).

Research Methods

In keeping with previous research, progress will move from diagramming based on current knowledge and calculations through the development of a series of physical experimental models devices (Shiji et al., 2003; Zhang, 2008; Hamzah et al., 2006). Simulation of the prototype circuit using Mathlab/Simulink will also take place; such simulation is also in keeping with standard practice in the field and with SPMC research specifically (Zhang, 2008; Hamzah et al., 2006). The prototype will be developed using DSP as a controller, and finally the physical field tests of the constructed prototype will be conducted and the results compared to those of the simulation. Regardless of the prototype outcome, the knowledge gained through these research methods will be of value to the field.