Showing papers by "Soumya R. Mohanty published in 2009"
TL;DR: It is observed that ELS technique outperforms over LMS and KF methods on power system frequency estimation and becomes very simple and attractive due to the absence of covariance and correlation matrix.
Abstract: This paper presents the estimation of frequency which is an important power system parameter by Extended Least Square (ELS) technique. The above technique is validated by comparing its performance with the existing techniques such as Kalman Filter (KF) and Least Mean Square (LMS) technique, etc. Using different simulation studies with signals having different signal to noise ratio values and with step change in frequency, it is observed that ELS technique outperforms over LMS and KF methods on power system frequency estimation. Initialisation of covariance matrix in KF method and complicacy due to incorporation of correlation matrix in LMS algorithm affect their convergence. But ELS algorithm becomes very simple and attractive due to the absence of covariance and correlation matrix.
20 citations
01 Dec 2009
TL;DR: In this article, a proportional-plus-integral (PI) controlled based small-signal analysis of isolated autonomous hybrid system with different energy storage combinations is presented in order to analyze the frequency deviation due to mismatch between power generation and load demand.
Abstract: A proportional-plus-integral (PI) controlled based small-signal analysis of isolated autonomous hybrid system with different energy storage combinations is presented in this paper. The hybrid systems supplying power to isolated loads comprise of different renewable energy resources such as wind, photovoltaic (PV), fuel cell (FC) and diesel engine generator (DEG) along with the energy storage devices such as flywheel energy storage system (FESS), battery energy storage system (BESS). Large band wind speed based on Van der Hoven's model is also presented in this paper in order to analyze the frequency deviation due to mismatch between power generation and load demand. Further ultracapacitor (UC) as an energy storing element and PI controllers are incorporated in the hybrid system in order to improve the frequency deviation. A comparative assessment for different hybrid systems in the presence of different storage system combinations and PI controller is carried out which reflects the improvements of the deviation in frequency profile in the presence of the ultracapacitors (UC) as compared to other storage elements.
18 citations
16 Dec 2009
TL;DR: A small-signal analysis of isolated autonomous hybrid system with high voltage direct current link (HVDC) or high voltage alternating current (HVAC) line for different energy storage combinations is proposed in this paper.
Abstract: A small-signal analysis of isolated autonomous hybrid system with high voltage direct current link (HVDC) or high voltage alternating current (HVAC) line for different energy storage combinations is proposed in this paper. The hybrid systems supplying power to isolated loads comprise of different renewable energy resources such as wind, photovoltaic (PV), fuel cell (FC) and diesel engine generator (DEG) along with the energy storage devices such as flywheel energy storage system (FESS), battery energy storage system (BESS).Ultracapacitor (UC) is incorporated as an energy storing element in order to improve the hybrid system performance. A comparative assessment for deviation in frequency profile for different hybrid systems in the presence of different storage system combinations is carried out which reflects the improvements of the deviation in frequency profile in the presence of the ultracapacitors (UC) as compared to other storage elements.
16 citations