Enhancing Transient Response and Voltage Stability of Renewable Integrated Microgrids

Abstract

Integration of renewable generation coupled with an energy storage system (ESS) in a power system increases the complexity of networks’ stability analysis and control. Therefore, an accurate stability assessment of power networks is expected to become a big challenge in the future. In this work, an effective approach to prevent power outage by controlling the source voltage of the power network is formulated to mitigate the effects of grid faults. Small signal stability studies are conducted on a renewable integrated IEEE 9 bus system as a case study with optimized size and allocation of ESS for reducing output power variability of renewables. An assessment is performed to study the effects of load-sharing devices on parallel generators under 6-cycle three-phase fault disturbances. The damping of the power network is increased at nominal and light loading conditions with 6-cycle three-phase fault disturbances through coordinated power system stabilizer (PSS) and static VAR compensator (SVC) at bus 9. The developed framework is extensively analyzed in steady-state conditions using a load flow program. Based on the results obtained, the proposed coordinated PSS-SVC device proves to possess comparatively better performance in terms of enhancing most of the system response rate under various load conditions with overall improved stability.

Particle Swarm Optimization for Optimal Frequency Response with High Penetration of Photovoltaic and Wind Generation

“…The last scenario considered the optimal allocation of the RES as presented in Figure 5, which was obtained using the proposed approach. With a view to showing the impact of the proposed approach, a basic control system was implemented in the RES, causing pessimistic stability responses in comparison to a comprehensive control system for RES [36]. It is relevant to mention that the disturbance consisted of a suddenly active power imbalance performed through the disconnection of the five highest loads within the system, i.e., load in bus 4, 8, 16, 20, and 39.…”

Research on operational characteristics and methods for new energy nearby connected converters

“…A optimal coordinated operation of a AC micro grid is to minimize the cost of operation subject, the system loss also reduces by 29.49%-31.36% in [8]. A renewable integrated IEEE 9 bus system study the effects of load-sharing devices under 6-cycle three-phase fault disturbances in [9]. A comprehensive assessment for battery energy storage system is used to reduce annual energy losses and mitigate reverse power flow and over voltage problem in [10].…”