Designing Two Parallel-Connected Voltage Source Inverters Based on Droop Control Strategy in Microgrids

In this paper, we study how to control the voltage, frequency and power supply required by load in a microgrid. Microgrid is a small low voltage power supply grid. It has two work modes:grid-connected mode and islanded mode.The most important challenge in using the microcontroller grid is to provide better control of distributed generations (DG) by connecting it to the microgridwith an inverter interface. Therefore, the main purpose is to control the inverters. In this paper, a drop-down control technique is proposed to control voltage and frequency of the microgrid and the power allocation between microgrids. The advantage of this method is using a single controller in both work modes. Also, there is no need for communication grids between micro components.

Keywords:

microgrid , distributed generation , drop-down control , voltage and frequency control.