XIII SIMPÓSIO DE ESPECIALISTAS EM PLANEJAMENTO DA OPERAÇÃO E EXPANSÃO ELÉTRICA XIII SYMPOSIUM OF SPECIALISTS IN ELECTRIC OPERATIONAL AND EXPANSION PLANNING Tie-Line Bias Control of a Power System with Large PV Plants Using PMU Information

SUMMARY The increasing penetration of uncertain and variable renewable energy into the transmission grid introduces challenges in real-time power system operation. A photovoltaic (PV) system’s power output fluctuation due to weather conditions (irradiance and temperature) causes the system’s frequency to fluctuate. The power and frequency fluctuations in systems with large MW PV plants raise dynamic and transient stability concerns. In this study, a two-area power system with large MW PV plants was considered, in which Area 1 provided power support to Area 2. To minimize power fluctuations and maintain the desired system frequency while concurrently maximizing the penetration of PV power into Area 2, automatic generation control (AGC) with tie-line bias control was implemented. The objective was to increase/decrease generations in Area 1, thus varying the tie-line power flow to balance out the PV power variability. Furthermore, phasor measurement unit (PMU) data were used in the AGC to drive the tie-line bias control. Typical results are shown for the steady state, variable PV generation and large tie-line disturbance conditions.