Operation Constraints and Methodology for Stability Preservation in Power Systems with High Penetration of Non-Synchronous Generation

Abstract

Nowadays, significant changes in the electricity generation mix raise questions about the secure operation of power systems. Most of the newly installed generation capacity is being connected to the grid via power electronic converters, thus can be seen as a non-synchronous generation. The theory of power system operation and control relies heavily on the characteristics of synchronous machines and conventional network structure. Therefore, the effective integration process of the new technologies must include the composition of new physical models for converter dominated large power systems as well as innovative solutions to ensure the secure operation in the future. The focus of this paper is a holistic analysis of the reducing power system inertia to frame up new constraints for system operators through simulation studies on the Institute of Electrical and Electronics Engineers standard 118 bus test system. The different system states and scenarios offer a comparison opportunity between stability preservation possibilities. Minimum inertia constraint calculation methodologies and various objective functions are being discussed. The utilization and effects of synthetic inertia from non-synchronous generators and energy storage systems is also considered to quantify the exact effects.

Review of Stability Analysis in Power Systems with High Penetration of Non-synchronous Generation

“…This usually needs a power source (energy storage capability) and advanced control to mitigate power imbalances between the generation setpoint and active power needs (substituting the kinetic energy storage capability of synchronous rotating masses in conventional turbine-generator units). Synthetic inertia provision with converter-interfaced non-synchronous generators is capable of limiting the RoCoF and increasing the frequency nadir [13]. Some synchronous zone transmission system operators are currently testing the synthetic inertia provision as a service to maintain stability during severe events.…”