Enhancing Multi-machine Power System Stability Considering Huge Penetration of Renewable Energy Sources

Abstract

As the growth of any country depends on electricity, need of electricity is increasing day by day. So, in response to it, power producers are expanding power grids continuously and it can be achieved by an increase in solar farms, wind farms, etc. which are called independent power producers (IPP's). As number of IPP's increases, renewable penetration also increases which affect the power system stability. So, to limit fault current or to maintain power system stability, various appliances are used like circuit breakers and fuses, but it has certain drawbacks like circuit breakers are more expensive to install, repair and replace and fuses during short circuit and overload once blows off its replacing take time. So, in order to overcome it various Fault Current Limiters (FCL) concepts are proposed and classified under different categories. But among them, a Superconducting FCL concept also has some drawbacks like big size, more weight and high cost. To overcome these drawbacks, Non-Superconducting FCL (NSFCL) is used as their size is 10 times smaller; weight is also less and cost is low. This NSFCL with various topologies are implemented with SMIB system for Doubly Fed Induction Generator (DFIG) Wind Farms (WFs) and their effects on various parameters are investigated. As DFIG comprises of gearbox it requires higher maintenance. To overcome this disadvantage, study of direct drive wind turbine is done and its comparison with gearbox wind turbine is observed. In this, NSFCL with various topology are implemented with SMIB system for direct drive Permanent Magnet Synchronous Generator (PMSG) Wind Farms (WFs) and their effects on various parameters are investigated. Also what will be the effect of PMSG when connected with WSCC 3 generator 9 bus system when no fault current limiter is there and when non-superconducting fault current limiters are implemented is also investigated.