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Voltage Stability Of Electric Power Systems

https://onlinelibrary.wiley.com/doi/pdf/10.1002/2050-7038.12885

A brief review on microgrids: Operation, applications, modeling, and control

Hybrid AC/DC microgrid test system simulation: grid-connected mode.

Major milestones in the development of high voltage direct current (HVDC) technologies and concepts were achieved in 1950s. Thanks to the high power thyristor switches (1960–70s), the HVDC technologies reached a significant degree of maturity in 1980s. The classical HVDC uses thyristor-based current-sourced line-commutated converter (LCC) technology. The advent of power semiconductor switches in 1980–90s, with turn on-off capabilities especially the IGBTs and IGCTs, and the on-going progress in this field, have introduced the conventional (two-level) voltage-source converter (VSC) technology and its variety of configurations, multi-level and multi-module VSCs, also as viable converter technologies for power system applications. The DC system is experiencing significant degree of re-emergence due to its potential to either directly address, or to facilitate resolving a large number of existing and anticipated interconnected AC power system steady-state and dynamic issues. HVDC technology made possible to transfer bulk power over long distances. In part I of this two-parts paper, comparative evaluations, studies, and review of HVDC versus HVAC transmission systems, are presented. Applications, different schemes of HVDC systems are also outlined.

High voltage direct current transmission - A review, part I

A review on control and fault-tolerant control systems of AC/DC microgrids.

Optimal reactive power compensation in electrical distribution systems with distributed resources. Review.

This paper exposes the feasibility to connect high voltage dc transmission (HVDC) systems to very weak ac networks leading to short circuit ratios (SCR) lower than 1.5. The existing literature does not provide solutions for such a low SCR systems and often the HVDC expansions cannot grow enough as expected. The studies developed are for the short-term voltage stability phenomena, where a solution using the PSCAD/EMTDC program for a very weak ac network with SCR = 1.0 is presented. The reactive power characteristics are shown since they are important to judge the behavior of solutions for ac/dc interactions.

Jorge W. Gonzalez

Papers

Hybrid AC/DC microgrid test system simulation: grid-connected mode.

A review on control and fault-tolerant control systems of AC/DC microgrids.

Optimal reactive power compensation in electrical distribution systems with distributed resources. Review.

Feasibility of HVDC for Very Weak AC Systems with SCR below 1.5

A novel strategy for dynamic identification in AC/DC microgrids based on ARX and Petri Nets