@inproceedings{chavan_acharya_bhattacharya_inam_2017, title={Damping of power oscillations induced by photovoltaic plants using distributed series-connected FACTS devices}, volume={2017-January}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85044191968&partnerID=MN8TOARS}, DOI={10.1109/ias.2017.8101759}, abstractNote={This paper demonstrates the capability of distributed series-connected Flexible AC Transmission Systems (FACTS) devices in damping power oscillations. Large power systems have resonant frequencies which result from the electro-mechanical power balance equations of synchronous generators connected to the power network. Transient events that affect power flow, like the loss of a transmission line, switching of loads, changes in renewable energy output can excite these resonant frequencies, referred to as modes, leading to power oscillations within the network. This paper proposes a power oscillation damping (POD) controller using multiple Static Series Synchronous Compensators (SSSC) connected in series on a single transmission line. The power oscillation frequencies in New York Power Authority's (NYPA) three-bus power system network are identified using the Matrix Pencil method, and a controller is designed to block the most prominent frequencies from them. The controller is implemented in PSCAD to damp power oscillations in NYPA's network and its performance while damping power oscillations is recorded.}, booktitle={2017 ieee industry applications society annual meeting}, author={Chavan, G. and Acharya, Sayan and Bhattacharya, S. and Inam, H.}, year={2017}, pages={1–7} }
 @inproceedings{chavan_bhattacharya_2016, title={A novel control algorithm for a static series synchronous compensator using a Cascaded H-bridge converter}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85002406485&partnerID=MN8TOARS}, DOI={10.1109/ias.2016.7731874}, abstractNote={This paper presents a novel control scheme for a Cascaded H-bridge (CHB) converter-based Static Series Synchronous Compensator (SSSC). The SSSC is a Flexible AC Transmission Systems (FACTS) device which is a Voltage Source Converter (VSC) connected in series with the transmission line and is primarily used for real power flow control over that transmission line. SSSCs can find applications in integration of renewable energy resources within modern power systems since they can allow transmission lines to transfer power beyond their stability limits. Further, SSSCs can be used as power oscillation damping (POD) controllers within an area. CHB-based SSSCs are advantageous as compared to conventional SSSCs since they eliminate the series transformer which usually interconnects the VSC with the transmission line. This paper proposes a DC capacitor charge-balancing algorithm for the CHB VSC specific to the SSSC operation. An eleven-level CHB-based SSSC was implemented in PSCAD along with the proposed voltage-balancing algorithms and its performance was evaluated in controlling real power flow along the transmission line.}, booktitle={IEEE Industry Application Society, 52nd Annual Meeting: IAS 2016}, author={Chavan, G. and Bhattacharya, Subhashish}, year={2016} }
 @inproceedings{chavan_acharya_bhattacharya_das_inam_2016, title={application of static synchronous series compensators in mitigating Ferranti effect}, volume={2016-November}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85001960773&partnerID=MN8TOARS}, DOI={10.1109/pesgm.2016.7741380}, abstractNote={This paper discusses a novel application of the SSSC which is a VSC-based FACTS device connected in series with the transmission line. An unloaded transmission line experiences Ferranti effect, i.e. the unloaded end of the transmission line experiences a voltage rise, which increases in magnitude as the length of the line increases. The SSSC can inject a controllable voltage in quadrature with the line current. Since the transmission line current is also in quadrature with the line voltage in the unloaded condition, the SSSC can take advantage of this to reduce the line voltage magnitude by injecting a voltage in phase with it. To verify this effect, the system is implemented in PSCAD along with a two-level VSC based SSSC with slightly altered controls. Voltage reduction at the receiving end was achieved when the SSSC was put in operation.}, booktitle={2016 ieee power and energy society general meeting (pesgm)}, author={Chavan, G. and Acharya, Sayan and Bhattacharya, S. and Das, D. and Inam, H.}, year={2016} }
 @inproceedings{mobarez_kashani_chavan_bhattacharya_2015, title={A novel control approach for protection of multi-terminal VSC based HVDC transmission system against DC faults}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84963632405&partnerID=MN8TOARS}, DOI={10.1109/ecce.2015.7310254}, abstractNote={Overall performance of the voltage source converters (VSCs) has improved during the recent years. Improvement of the VSCs along with the attractive features of the VSC based high voltage direct current (HVDC) transmission systems over the thyristor based HVDC transmission systems make it possible to build multiterminal (MT) VSC HVDC transmission systems. However, the VSCs are vulnerable against dc side faults and a method needs to be employed to extinguish the dc fault current. In this paper, three different configurations of solid state dc circuit breakers (CB) for protection purposes are studied. Moreover, a new control method to protect the VSCs against the dc side fault is proposed, the new method makes it possible to extinguish the dc fault current with the existing ac breakers on the ac side or with the lower rating solid state (SS) DCCBs. The performance of the SS DCCBs and the proposed method are studied using Real Time Digital Simulator (RTDS).}, booktitle={2015 IEEE Energy Conversion Congress and Exposition, ECCE 2015}, author={Mobarez, M. and Kashani, M.G. and Chavan, G. and Bhattacharya, Subhashish}, year={2015}, pages={4208–4213} }
 @inproceedings{azidehak_chattopadhyay_acharya_tripathi_kashani_chavan_bhattacharya_2015, title={Control of modular dual active bridge DC/DC converter for photovoltaic integration}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84963537568&partnerID=MN8TOARS}, DOI={10.1109/ecce.2015.7310140}, abstractNote={The DC transmission system provides a cost effective solution for long distance power transmission compared to the AC transmission system. Hence, this has increased the emphasis on the development of the DC transmission system. Development of power converter with modular structure has now made it possible to achieve higher voltage and power level. This opens the possibility for further development of a multi-terminal DC grid. Now once the DC grid system has been formed, it is also important to include more renewable energy sources directly to the DC grid. Therefore, a power conversion stage is required to condition the available power from a source to the grid. This paper shows the operation and control of such a kind of converter system which integrates the solar cell to the DC grid directly. The paper mainly focuses on control of the series connected DAB that have been integrated to HVDC power network. In order to deliver power in HVDC system, the total number of DABs must be high enough to achieve the DC link voltage. The control in that case must be a combination of current and voltage control. In order to validate the proposed control, complete system has been implemented on Opal-RT™ and hardware in the loop (HIL) using external controller has also been implemented to show the system operation.}, booktitle={2015 ieee energy conversion congress and exposition (ecce)}, author={Azidehak, A. and Chattopadhyay, R. and Acharya, Sayan and Tripathi, A. K. and Kashani, M. G. and Chavan, G. and Bhattacharya, S.}, year={2015}, pages={3400–3406} }
 @inproceedings{acharya_azidehak_vechalapu_kashani_chavan_bhattacharya_yousefpoor_2015, title={Operation of hybrid multi-terminal DC system under normal and DC fault operating conditions}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84963585191&partnerID=MN8TOARS}, DOI={10.1109/ecce.2015.7310417}, abstractNote={Recently, multi-terminal DC (MTDC) system has received more attention in the power transmission areas. Development of modular structured power converter topologies has now enabled the power converter technology to attain high voltage high power ratings. Compared to current source converter technology, voltage source converters have several benefits including higher power quality, independent control of active and reactive power etc. This paper focuses on a unique MTDC system consisting of terminals with different converter topologies especially considering the fact that each of the terminals may be manufactured by different vendors. In this particular configuration, the MTDC system consists of four terminals namely two advanced modular multi-level converter with high frequency isolation, one standard modular multi-level converter (MMC) with half bridge sub modules and the fourth terminal is modular DC-DC converter which integrates PV along with a Battery energy storage system with the DC grid directly. This paper presents a system level study of hybrid MTDC System. Also the DC fault contingency case has been explored thoroughly. An algorithm has been proposed to prevent the system damage. All the cases have been demonstrated with the PSCAD simulation results. To show the system practically works in real time, the system is also evaluated in a unique real time platform, consisting of interconnected RTDS and OPAL RT systems.}, booktitle={2015 ieee energy conversion congress and exposition (ecce)}, author={Acharya, Sayan and Azidehak, A. and Vechalapu, K. and Kashani, M. and Chavan, G. and Bhattacharya, S. and Yousefpoor, N.}, year={2015}, pages={5386–5393} }