• K.Soumya
• Dr. M Ramesh

Voltage-source converters (VSCs) are widely used in renewable energy sources as the gridiron interface, e.g., wind turbine generators and photovoltaic. These VSCs ascendancy the dc-link capacitor voltage and the reactive power production to track the reference values, which generally apply phase-locked loop (PLL) for grid synchronization. However, the dynamic performance of the conventional PLL can be deteriorated when the VSC is integrated into weak grids, which may even cause instability of the VSC. In this paper, a virtual synchronous control (ViSynC) is proposed for VSCs, which utilizes the dynamics of the dc-link capacitor to realize self-synchronization. Grid synchronization mechanism of the ViSynC-based VSC is mainly analyzed in this paper. The sync-based VSC can provide inertial responses to the grid, and has the advantage that it can operate normally under weak grid conditions without any modification of the grid synchronization unit. Furthermore, virtual impedance and Q–V droop control can be easily applied in the control structure of the ViSynC. Simulations based on MATLAB and hardware-in-the-loop real-time simulations based on RT-LAB verify the effectiveness of the proposed Vsync

DC-link voltage control, grid synchronization, inertia emulation, virtual synchronous control (ViSynC), voltage-source converter (VSC), weak grids.

"A Virtual Synchronous Control for Voltage-Source Converters Utilizing Dynamics of DC-Link Capacitor to Realize Self-Synchronization", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 12, page no.184-189, December-2018, Available :http://www.jetir.org/papers/JETIR1812628.pdf

"A Virtual Synchronous Control for Voltage-Source Converters Utilizing Dynamics of DC-Link Capacitor to Realize Self-Synchronization", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 12, page no. pp184-189, December-2018, Available at : http://www.jetir.org/papers/JETIR1812628.pdf