Stability Improvement of a Multimachine Power System Connected with a LargeScale Hybrid Wind-Photovoltaic Farm Using a Supercapacitor

Stability Improvement of a Multi machine Power System Connected with a Large Scale Hybrid Wind-Photo voltaic Farm Using a Super capacitor

Stability Improvement of a Multi machine Power System Connected with a Large Scale Hybrid Wind-Photo voltaic Farm Using a Super capacitor

 

Abstract —

This paper presents the stability improvement of a multi machine power system connected with a large-scale hybrid wind-photo voltaic (PV) farm using an energy-storage unit based on super capacitor (SC). The operating characteristics of the hybrid wind-PV farm are simulated by an equivalent aggregated 300-MW wind-turbine generator (WTG) based on permanent-magnet synchronous generator and an equivalent aggregated 75-MW PV array. The WTG and the PV array are connected to a common dc link through a voltage-source converter and a dc/dc boost converter, respectively. The power of the common dc link is transferred to the multi machine power system through a voltage-source inverter, step-up transformers, and a connection line. The SC-based energy-storage unit, which is integrated into the common dc link through a bidirectional dc/dc converter, is employed for smoothing out the power fluctuations due to variations of wind speed and/or solar irradiance. A PID supplementary damping controller (PIDSDC) is designed for the bidirectional dc/dc converter of the SC to enhance the damping characteristics of the low-frequency oscillations associated with the studied multi machine power system. The root loci of the studied system are examined under wide ranges of wind speed and solar irradiance. The effectiveness of the proposed SC joined with the PID-SDC on improving the performance of the studied system under different disturbance conditions is also demonstrated using time-domain simulations.

 

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