Contents lists available at ScienceDirect Electrical Power and Energy Systems journal homepage: www.elsevier.com/locate/ijepes ADSIG as Gen-Former providing three port network for soft coupling of distribution feeders in addition to wind energy harvesting Vishal Verma ⁎ , Ramesh Singh, Ritika Gour Electrical Engineering Department, Delhi Technological University, Sahabad Daulatpur, Delhi 110042, India ARTICLE INFO Keywords: Multi Port Power Network Dual Stator Induction Generator Renewable Enegry sources Soft Coupling ABSTRACT With increase in the Electric Vehicle (EV) load the coupling of feeder in the distribution has become essential. The paper prescribes the use of multiple Asymmetrical Dual Stator Induction Generator (ADSIG) acting as ‘Gen- Former’ to draw out coupling of feeders for bidirectional power transfer in addition to energy harvesting from the feed on its rotor from wind energy source. The paper presents an analysis of soft coupling for two feeders by providing route for power to flow from one power feeder to other power feeder region in addition to harvesting power from wind energy turbine. Asymmetrical Dual Stator Induction Generator (ADSIG) is modeled and analyzed for enacting as soft coupler for power transaction between two feeders together with wind energy harnessing. An experimental study is also done on a scaled down 3.75 kW developed prototype in the laboratory. The performance of the proposed system is analyzed and results show effective coupling between the feeders with power injection and effective power distribution by ADSIG under perturbing load conditions on either of the connected feeders. 1. Introduction Often an electrical power distribution network of a campus or an organization is fed from two or more distribution transformers, where power is further fed through multiple feeders to different connected loads. With passage of time, loading increases un-proportionately on these feeders and many EV loads have increased, whereas, electrical infrastructure is often not upgraded. To accommodate the overload on a particular feeder at a given point of time, a need for reconfiguration of distribution feeder or demand side load management is often felt. Demand side load management is not considered as the befitting solu- tion, thus furthering in research for devising the means and ways for reconfiguration of distribution feeder seems to be inevitable. Further, fault on one of the radial feeders make the area dark due to isolation of the feeder at the sub-station, this poses a question on reliability. And, the same is typically not solicited in a campus network which is po- pulated with critical loads and demands higher reliability. The relia- bility is increased either by upgrading the distribution feeder or by active reconfiguration of distribution feeder, by getting the requisite feeds from neighboring feeders which adds to the cost of system. Asynchronous tie in transmission network has been in use for long time through HVDC links which does provide power flow control across the link [1]. With the maturity of IGBT devices for large power, Back-to- Back (BTB) Voltage Source Converter (VSC) links and Solid State Transformer (SST) technologies have emerged as an excellent choice for interconnection at the level of sub-transmission lines and distribution system and provide even better control for power transfer [2], but at increased cost with complex architecture. In the meantime, the distribution network has witnessed integration of numerous renewable energy sources (RES) [3]. This has furthered the need for reconfiguration of distribution network by inter-connecting the feeders for enhanced local power utilization with higher efficiency, reliability and stability. Complex configurations involving multiple in- verters are reported in literature for grid integration of RES [4,5]. The power generated from squirrel cage induction generator or permanent magnet synchronous generator is invariably converted into DC and this varying power generated is injected into the distribution network with different configuration of power electronic systems [6,7]. Comprehen- sive configuration by augmenting wind energy harvesting through DC bus of BTB-VSC and multi-port Solid State Transformer (SST) is re- ported [6–8]. Dual stator induction generator (DSIG) has recently emerged as a three-port power harvesting device where, both the stator windings are operating at power frequency and are coupled with squirrel cage rotor, thus forming the magnetic circuit with equal number of poles. This enables direct power transfer through both stator windings in- dependently or to a single 3-phase circuit via star-delta transformer/ inverters and via rotor circuit, for mechanical and/or electrical port https://doi.org/10.1016/j.ijepes.2019.105573 Received 24 April 2019; Received in revised form 17 July 2019; Accepted 23 September 2019 ⁎ Corresponding author. E-mail address: vishalverma@dce.ac.in (V. Verma). Electrical Power and Energy Systems 117 (2020) 105573 0142-0615/ © 2019 Published by Elsevier Ltd. T