@article{cakir_baran_2021, title={Performance Assessment of Current Based Distribution System State Estimator}, DOI={10.1109/TPEC54980.2022.9750793}, abstractNote={State estimation methods need to be tailored for real-time monitoring at distribution level to address the computational burden. One of the promising approaches converts the measurements to equivalent current measurements. This paper focuses on a comprehensive assessment of the performance of this method. The metrics adopted aims to assess the main performance issues of bias, consistency, and quality. This paper also examines the dependency of the method's performance on the measurements available for estimation. Test results on a sample test feeder have also been provided to illustrate the importance of the proposed performance assessment approach, as the results show that the performance metrics used provide valuable insights about the limitations of the use of the equivalent current injections when there is only a limited number of measurements available at distribution level.}, journal={2022 IEEE TEXAS POWER AND ENERGY CONFERENCE (TPEC)}, author={Cakir, Gokhan and Baran, Mesut}, year={2021}, pages={61–66} }
 @article{dsouza_wang_cakir_baran_zhao_2021, title={Power Electronics Assisted Voltage Regulator: An Effective Solution for Mitigating Voltage Variations Caused by High Penetration PV on a Distribution System}, ISSN={["2329-5759"]}, DOI={10.1109/PEDG51384.2021.9494246}, abstractNote={The ever-increasing levels of distributed energy resources (DERs), especially solar photovoltaics (PV) tend to detrimentally affect the operation of the distribution systems on which they are installed, causing issues like voltage violations, excessive voltage regulator operations, voltage flicker, etc. Recent improvements in power electronics have led to an increase in the proliferation of power electronics based voltage regulators that are capable of fast voltage compensation. However, being a recent addition, very few studies exist that quantify the benefits of such devices on a distribution system. This work uses a case study to quantify the main benefits of a power electronics assisted voltage regulator (PEVR) in mitigating the impacts of high penetration PV using a supervisory control scheme for the PEVR. This study considers high resolution (1 second) PV and load profiles to capture the accurate operation of the step voltage regulator (SVR) and PEVR. The results from this case study highlight the effectiveness of a PEVR in mitigating excessive voltage variation and tap operations due to high penetration PV. The results also illustrate the trade-off between converter capacity and benefits.}, journal={2021 IEEE 12TH INTERNATIONAL SYMPOSIUM ON POWER ELECTRONICS FOR DISTRIBUTED GENERATION SYSTEMS (PEDG)}, author={DSouza, Keith and Wang, Yafeng and Cakir, Gokhan and Baran, Mesut and Zhao, Tiefu}, year={2021} }