Date of Award
Master of Science (MS)
Electrical and Computer Engineering (Holcomb Dept. of)
J Curtiss Fox
Increased penetration of distributed generation has created the need for some ne technologies and also the reemergence of some older technologies too. As these technologies penetrate the distribution grid more, engineers need to create models to simulate their performance to be able to accurately detail the impact these resources will have on the grid. Two technologies examined in this paper are a turbine model for a CHP system and an inverter capable of advanced grid support functions.
CHP, combined heat and power, is an older technology that is seeing a resurgence especially on the 1-20 MW capacity scale. When building a CHP system with the intention of creating an additional revenue stream by selling power to the grid, a variable speed model is necessary in case of an island scenario. A variable speed model is essential to not cause local grid instability due to large amounts of over or under generation. A variable speed model is developed in this paper to help simulate the dynamics of a natural gas turbine during step and ramp changes in demanded power.
Secondly, an inverter capable of advanced grid support functions is developed to meet IEEE 1547-2018 standards with respect to over and under-voltage ride-throughs. Voltage ride-throughs are essential for grid stability, so the grid does not lose a large percentage of power generation at the slightest disturbance. A logic circuit is developed for continuous over and under voltage tripping scenarios and also for return to service once the grid has returned to nominal operating voltage conditions.
Future work will address the coupling of these two models together for a complete CHP blockset ready for integration into distribution system models.
Quigley, Kevin T., "Combined Heat and Power Dynamic Turbine and Generator Blockset Model with Advanced Grid Support" (2020). All Theses. 3310.