Dynamic behavior analysis of distributed generation in an off-grid network with power system simulator for engineering (PSS/E)

The integration of distributed generation technologies into distribution networks creates a number of technical issues. In order to analyze a grid and examine the impacts of distributed power penetration, considerations such as the dynamic behavior of powers systems that entails transient stability analysis, grid capacity and limits characterization need to be taken into account. Besides, this kind of study is very important to ensure the network´s secure operation under fault incidents. Although, in the current paper, Steady State and Dynamic Analysis configurations are proposed in order to determine the allocation, maximum capacity of embedded generation that may be inhabited within a real island power system, emphasis is paid on the Dynamic Analysis configurations. In this way, it is possible to check the off-grid system´s behaviour under normal operation and against several disturbances onto the grid. Geothermal plants using basic machine model such as synchronous generator, exciter and governor and Wind farms employing Doubly-fed Induction Generator (DFIG) technology were chosen throughout this research work. The adequate stability margin of the system was investigated upon the fault ride through capability and frequency response of the network elements whereas among the most critical perturbations was a three phase fault application at the connection point of the wind farm. Moreover, two different exciter models (IEET1 & EXST1) were chosen to perform open-circuit setpoint step tests and record their field voltage and terminal voltage responses after tuning application. PSS®E software simulation tool of Siemens PTI will be utilized throughout this work.