Abstract
Normally, HVDC links are used for the asynchronous interconnection of power system networks. Similarly, asynchronous AC links are also used for the same application. Here, the performance of a proposed flexible asynchronous AC link (FASAL) and a back-to-back line-commutated converter-based high-voltage direct current (BTB LCC-HVDC) link is evaluated and compared. These links are used for grid interconnection and to control the power transfer between interconnected grids. PSCAD/EMTDC based simulation model is developed for both the links. Modified CIGRE benchmark system is used for the simulation of the BTB LCC-HVDC link. The steady-state and dynamic simulations are carried out for the systems under consideration. The simulation results show that both the links are able to control power flow between the interconnected grids. It is evident from the results that the effect of fault is severe in the LCC-HVDC link as compared to FASAL system. Also, the impact of the fault on the healthy side grid is minimal in the FASAL as compared to the HVDC link.
Highlights
Electric power grids are interconnected with the neighbouring grids for economic and reliable power supply
line-commutated converters (LCC)-high voltage direct current (HVDC) is a well established and mature technology [35], focus of this paper is to evaluate and compare the performance of flexible asynchronous AC link (FASAL) system with BTB LCC–HVDC system used for grid interconnection and power flow control
The equivalent circuit of a doubly-fed induction machines (DFIM) is represented in an arbitrary reference frame rotating at angular speed of ω is shown in Fig. 3 [38]
Summary
Electric power grids are interconnected with the neighbouring grids for economic and reliable power supply. The high voltage direct current (HVDC) is used to interconnect two electric power grids and to control the power transmission between them which may be synchronous or asynchronous. The variable frequency transformer (VFT) is a power transmission technology which provide bidirectional power flow control between two power system networks It consists of a wound rotor induction machine (WRIM) having three-phase windings on both stator and rotor. LCC-HVDC is a well established and mature technology [35], focus of this paper is to evaluate and compare the performance of FASAL system with BTB LCC–HVDC system used for grid interconnection and power flow control. The simulation model of the conventional back-to-back line-commutated converter-based high-voltage direct current (BTB LCC-HVDC) system is developed which is based on modified CIGRE benchmark model using PSCAD/EMTDC software and its performance during steady-state condition is evaluated. It is evident from the above expression that the power depends on the voltage and the frequency
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