State‐space modelling of an interconnected system of renewable energy sources and grid for rural electrification

Abstract

This study deals with the development of a state-space model for an interconnected system of renewable energy sources (RES) with grid. The RES technologies considered for power generation in the interconnected system are doubly fed induction generator (DFIG) based wind energy conversion system and biogas genset. A linearised model for DFIG has been developed for the system. For biogas genset, the control of frequency and voltage is taken care by the electronic speed governor and IEEE type-I excitation system, respectively. The interconnected system takes a fixed feed of power supply from the grid and the rest of the consumer load is taken care by the RES. Finally, state feedback controllers have been developed for this interconnected system which maintains the active and reactive power balance between different sources of RES when small signal perturbations are given in load and input wind power. The comparative analysis has also been performed with the conventional PI controllers in order to demonstrate the superiority of proposed feedback controllers for the interconnected power system.

Impact of renewable energy in Indian electric power system

“…Bajaj et al [52] presented an analytic hierarchy process for PQ assessment through unified power quality single index (UPQI) within the entire distribution network (DN) having RPG and verified on IEEE-13 bus test distribution system in MATLAB/Simulink environment to assess the overall PQ performance of each of the buses and the entire DN with respect to the threshold level of unity. Bhamu and Bhatti [53] have developed state-space model for their power system model interconnected to the system to ensure stable operation to maintains active and reactive power balance of RES. Hirase [54] have analyzed the grid supportive functions in grid tied inverters with RPG with a detailed guideline based on stabilization/disturbance theory, needed for the system administrator.…”

Multi control adaptive fractional orderPIDcontrol approach forPV/wind connected grid system

“…The matter becomes more complicated since the optimal operation of both PV/Wind sources requires strong control mechanism of maximum power point tracking (MPPT). Therefore, it is necessary to execute the effective control operation of power processing blocks of PV/Wind hybrid system such that the power mixing becomes compatible with the grid system 6,7 …”