Over the years, high voltage transmission of large energy blocks over long distances has widely developed from the Line Commutated Converter (LCC) technology. However, the continuous expansion of the AC network and the increase in renewable energy penetration leads to the weakening of Electric Power Systems (EPS), causing operational problems for the LCC-HVDC. This paper evaluates the degree of contribution of the VSC-HVDC on the LCC-HVDC dynamic performance when the infeed is in a hybrid multi-infeed HVDC system. Through a steady-state mathematical framework, the new concept of Hybrid Power Voltage Interaction Factor (hPVIF) is proposed to assess the transient stability improvement of LCC. Additionally, this article introduces two key contributions from hPVIF: the complementary Improved Commutation Failure Immunity Index (iCFII), as a measure of the effective short circuit enhancement, as well as the apparent line length, which emulates the line lengths adjusting the power dispatch in the VSC-HVDC. PSCAD/EMTDCTM time-domain dynamic simulations are performed to assess the indexes, and the Matlab® software will be used to assist in mathematical operations.
A doubly three-phase fed synchronous reluctance machine (SynRM) is designed for electrical vehicle powertrain application. SynRM aims to deliver instant power and high power density, high torque at low speeds and high power at high speeds, wide speed range, high efficiency throughout its range of operation, ruggedness, high safety at a reasonable cost. Under these requirements, a 60 kW, 9000 rpm and 400 Nm SynRM has been designed. The main objective is to demonstrate the SynRM powertrain operation behaviour and determinate the operation points electrically and thermally. To reach the proposed SynRM goal, a new direct torque control algorithm based on output regulation subspace theory control is presented. The winding motor topology is galvanic isolated, so it is possible to operate with the six phases directly to the load and because of that, the combination with a back-to-back (B2B) converter becomes so profitable. To validate the system, two B2B fullconverters and two motors (SynRM and induction machine) were used in a real test bench. Finally, a simulated and real efficiency map is obtained covering different drive cycles range. Some remarks about normal and failure mode of operation are presented.
A six-phase synchronous reluctance machine (SynRM) is designed for electrical vehicle (EV) powertrain applications. The SynRM in the charger mode is able to provide instantaneous power and high power density, high efficiency with two modes of charge, robust reliability, high safety and fault tolerance. The properties of the SynRM are 60 kW, 9000 rpm and 400 N m. The main objective of the SynRM powertrain used as a charger is proved electrically, thermically and to be fault tolerant using a specific test bench. The winding motor topology is galvanic isolated, making it possible to load directly from the single-phase and three-phase grid, enabling two ways of charging, which increases the reliability. For this reason, the back-to-back fullconverter and the SynRM as a charger are used. The main goal is to prove the utility as a charger and the great efficiency derived from the SynRM plus inverter topology for electric cars. This SynRM + inverter topology offers redundancy for all load modes.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.