A Novel Control of 2DOF PID based Grid Connected PV – Wind Hybrid Sytem

Nowadays, hybrid renewable energy based grid integrated systems are extensively utilized. These systems commonly integrate PMSG coupled wind power generation and Photovoltaic systems due to their advantages. However, the power generation from wind relies on wind velocity, while Photovoltaic power generation relies on solar irradiance. Consequently, power production from both sources can be inconsistent. To tackle this issue, an efficient control method must be implemented to inject the generated power into the utility grid. The study compares the effectiveness of the 2DOF PID controller with Proportional & Integral and Mamdani Fuzzy controllers in managing abrupt system changes. The control strategy proposed, utilizing 2DOF PID controllers, is tailored for the DC and AC sides of the grid-connected system. Its objective is to link the wind-PV hybrid system with the grid seamlessly. This sophisticated control method not only compensates for the reactive power demanded by loads, but also reduces the harmonics produced by nonlinear loads, and maintains balanced grid currents even when unbalanced loads are linked to the PCC. Hence, the proposed control methodology can be able to improve the power quality by supplying quality power at local bus. Additionally, the control strategies implemented in the DC-DC converters for wind and PV systems allow for optimal operation at the maximum power point across different scenarios. Extensive results are gathered from hardware-in-the-loop experiments using OPAL-RT devices.