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Controller design for renewable energy power electronics converter using Simulink control design tool

An alternative energy source such as solar and wind energy are more environmentally acceptable when compared to the traditional fossil fuels-based energy sources. These types of sources are known as the renewable energy sources (RES) since they can be replenished naturally. Due to the increased amount of the grid-connected inverters, this has resulted into problems of instability of the grid and power quality problems. Thus, regulations that are more demanding have been established to resolve these issues. In order to meet these requirements, there is need to improve the control system of distributed generation system for grid interconnection. The major objective of this paper is to design and implement the control system of a grid-connected inverter using the self-tuning tool of Simulink control design toolbox in MATLAB. The Proportional-integral (PI) controller is automatically designed and verified. The designed gains are then used in the nonlinear power converter topology to study compliance to control objectives. Measurement variables such as the grid voltage and grid current have to be transformed into a synchronously rotating reference frame in order to attain zero steady error for the control variable. Hence, the control system design process is less time consuming and can be accomplished intuitively. The design and the performance of the system are discussed. Simulations were carried out on Matlab/Simulink software to verify the proficiency of the control algorithm.