High-frequency oscillations caused by voltage source converters (VSCs) are constantly emerging in power systems with the increasing penetration of renewable energies. VSC models in current control timescale play a pivotal role in the analysis of these oscillation issues. Conventional VSC models show few physical mechanisms of VSC dynamics during system oscillations. Hence, this paper proposes a...

This paper presents a control strategy for fuel cell/energy storage power generation system during voltage sag conditions. The hybrid DC power sources are connected to grid using power electronic converters include DC-DC converter and grid connected voltage source inverter. The power from hybrid power sources is controlled during voltage sag by designing of control strategy for DC-DC converter....

In this paper, a reliable methodology is proposed in order to implement and validate Model Predictive Control (MPC) scheme on an actual Voltage Source Converter (VSC) integrated scale-down multi-terminal DC grid. The objective of the investigated MPC controller enable AC frequency support among two asynchronous areas through High Direct Current (HVDC) grid, while considering physical constraint...

Voltage source converter based high voltage DC system (VSC-HVDC) has become a very promising solution to integrate offshore wind farm. However, the equivalent inertia of modern power with large renewable energy integration becomes small, which will arouse some frequency stability problems. To tackle this problem, paper proposes an improved regulation strategy for VSC-HVDC integrated Firstly, in...

For the black start-up of DC micro-grids, three-phase charging resistors are required to limit uncontrollable surge current. The main drawback this method is difficulty in determining appropriate resistance value achieve a rapid and current with change grid parameters. To address problem, article proposes soft for micro-grid based on an improved two-level voltage source converter (VSC). Specifi...

A sub-/super-synchronous interaction (sub-/super-SCI) can occur between a voltage source converter-based high-voltage direct current (VSC-HVDC) and the permanent magnet synchronous generator (PMSG)-based wind farms with long AC transmission lines. However, influencing factors have not been properly analyzed. In this paper, these are deconstructed mathematically analyzed from detailed small-sign...

-This paper describes an alternative STATic synchronous COMpensator (STATCOM), by connecting a number of Gate Turn Off (GTO) thyristor converters in series on the ac side of the system. Each GTO converter forms one ‘link’ of a 1-phase, full-bridge Voltage-Source-Converter (VSC) and is referred to as a ‘Chain Link Converter’ (CLC). Each GTO of a CLS, is switched ‘ON/OFF’ only once per cycle of t...

This study presents an application for a series VSC (voltage source converter) in distribution grids power flow management. Series devices have been widely studied FACTS (flexible AC transmission systems), however, more recently these gained increased interest applications loading balance medium voltage grids. As the number of distributed generation (DG) units increases, increasing capacity and...

This paper proposes a modified structure for the Dynamic Direct Voltage Controller (D2VC), here defined as Modified (MD2VC) application in distribution grids. An advantage of this controller is online voltage compensation systems using three-phase Source Converter (VSC) shunt side instead three single- phase VSCs case original proposed configuration D2VC. In case, series are connected to VSC by...