Newly launched micro grid-connected inverter

Figure 1: Overview of microgrids. Toshiba developed a prototype GFM inverter that provides synthetic inertia and suppresses the fluctuations of the grid frequency in distribution systems even when fluctuations in power supply or power demand occur (Figure 2) and demonstrated its effectiveness.

The current seen in the graphic is magnified by a factor of five due to the modest simulated current. The grid-connected voltage frequency is 50 Hz, and the figure shows that the suggested inverter meets the grid-connection requirement effectively. Fig. 10. Waveforms for micro-inverter's output.

Grid-connected micro-inverters, known for their straightforward wiring and operational stability, have garnered increasing interest from both industry and academia.

The inverter is interfaced to the grid via an LCL filter. A relay is used to connect and disconnect the inverter from the grid whenever required by the application. The schematic in Figure 11 shows the filtering and relay schematic section.

Every algorithm for grid-connected inverter operation is based on the estimation or direct measurement of grid voltage frequency and phase angle. The detection method used in this implementation for a single-phase inverter is based on a synchronous reference frame PLL.

Inverters have assumed that the grid is strong and will provide a stable and clean voltage and that they are able to inject real power into the grid without undue impact on its operation. References is not available for this document. Need Help?