Coordinated Distributed Security Constrained Unit Commitment with Frequency Deviation Control for High Renewable Penetration Low Inertia Power Grids

Among different renewable resources, wind power and solar photovoltaics (PVs) have the most desirable technical and economic prospects. However, the significant penetration of such low inertia power plants in power grids causes a decrease in the system's total inertia and thereby leads to a decrease in system frequency deviation (SFD) more than the acceptable range. This paper presents a distributed (D-SCUC) problem in which system frequency deviation is considered as a constraint to prevent system frequency deviation more than the pre-determined level. With the proposed method, the system partitions into several areas wherein a SCUC problem is separately solved, and the analytical target cascading (ATC) method is used to coordinate these sub-systems. To avoid the masking effect, a modified penalty function is used. A simple ۶-bus network and the modified IEEE RTS ۲۴-bus test system are used as the case study. The results show the effectiveness of the D-SCUC technique, especially in large power systems, and therefore, the system operator's concern about the system frequency is relieved.

Keywords:

renewable energy sources , wind power , solar PVs , D-SCUC problem , low inertia , analytical target cascading , system frequency deviation