Microgrid control with parallel distributed energy resources

In an era of energy shortages, people are developing renewable energy power sources. However, there can be multiple power sources either traditional generators that use oil or natural gas or renewable energy in no matter microgrids or conventional grids. Thus, the control technique to stabilize the grid and make the power generations share the load perfectly based on their capacities is indispensable, which is the droop control technique. In this paper, the control system is built based on the DC power sources since the goal is to make the system works well with photovoltaic sources (PVs). Thus, an inverter-based control system that applies voltage source converters (VSCs), grid forming capability, dq0-transformation, voltage regulators, current regulators, feed-forward control, pulse-width modulation (PWM), modulation index, and droop characteristics will be built in Matlab/Simulink software. After building the Simulink model of the control system, there is a process to validate the designed control system through the simulation (also with Matlab/Simulink software). There are two parts to the experiment while using the simple DC power sources (such as the battery model) to verify the correctness of the build of the control system first, then connect the PVs to the systems to check if the designed system is still performing well. The results verify that the designed control system is proper and performs well with any DC power sources, which means that the control system makes the DC power sources share the load ideally based on their capacities.