A flexible asynchronous AC link (FASAL) system is a technology that interconnects two power networks operating at the same or different frequencies. The FASAL newly developed technology; therefore, it requires thorough investigation under unbalanced grid voltage conditions for better behavioral understanding and appropriate future controller design. In this paper, analyzed various symmetrical a...

Generalized S-transform is a time-frequency analysis method which has higher resolution than S-transform. It can precisely extract the time-amplitude characteristics of different frequency components in signal. In this paper, novel protection for VSC-HVDC (Voltage source converter based high voltage DC) on proposed. Firstly, extracting component fault current by and using mutation point to dete...

Driven by environmental and economic aspects, the proliferation of renewable energy sources (RES) has been expanded in power systems worldwide. In this regard, intermittent generation such RESs (e.g., photovoltaic wind farms) can cause several operational stability problems low-inertia systems. To handle these issues, great interest literature directed to develop feasible grid-forming voltage s...

A wind farm with series dc collection can potentially eliminate the costly offshore platform and its step-up components. Multiple strings be connected in parallel to extend power capacity for a given voltage. In such arrangement, DC/DC converters individual generators are rated at only fraction of transmission The maturity superconducting cable technology will difficulty losses high current low...

Multi-timescale interaction of power electronics devices, including voltage source converter (VSC), has made the stability and analysis high penetrating renewable systems very complicated. In this paper, impedance model is used to analyze multi-timescale characteristics VSC. Firstly, VSC are investigated based on Bode plots. It found that slow-timescale (within DC-link control scale) fast-times...

Wind energy is expected to play a crucial role in the energy mix in the future society with limited access to fossil fuels. Wind turbines with larger power rating are being installed every year, making possible to extract more energy from wind. In countries where wind power has become a relevant part of the total generated electrical power production, transmission system operators (TSOs) have i...

In this paper, a new topology for cascaded multilevel inverter based on quasi-Z-source converter is proposed. In the proposed topology the magnitude of output DC voltage is not limited to the sum of magnitude of DC voltage sources. Moreover, the reliability of the circuit due to capability of short circuit by Z-source network is increased. The quasi-Z- source converter in different modes is ana...

This paper introduces a new control approach for Voltage Source Converter (VSC) stations in multi-terminal dc (MTDC) grid to provide mutual frequency support among asynchronous ac networks. The developed coordinated strategy modifies the active power references of each droop-controlled converter considering its adjacent system's operational condition enable desired support. Specifically, propos...

In recent years, wind energy has become one of the most important and promising sources of renewable energy, which demands additional transmission capacity and better means of maintaining system reliability. The evolution of technology related to wind systems industry leaded to the development of a generation of variable speed wind turbines that present many advantages compared to the fixed spe...