Rajanand Patnaik Narasipuram

Bio: Rajanand Patnaik Narasipuram is an academic researcher. The author has contributed to research in topics: Total harmonic distortion & AC power. The author has an hindex of 2, co-authored 4 publications receiving 17 citations.

Efficiency analysis of maximum power point tracking techniques for photovoltaic systems under variable conditions

Abstract: With the rapid increase in development of solar energy, researchers are concentrated on developing the maximum power point tracking (MPPT) techniques for extracting the power efficiently. It was environmentally friendly, low maintenance cost, no noise, used in remote areas, and long-lasting life. The output power of PV module is depending on the solar irradiance and temperature. So, to extract more power MPPT techniques are employed. This paper describes the comparative analysis of various MPPT's like perturb and observe (P&O), incremental and conductance (IC), fuzzy logic (FL) controller, and neuro-fuzzy (NF) technique. The controlled output is fed as input to the boost DC-DC converter and the effective performance of the MPPT's are checked under different irradiations and constant temperature. And also, this paper gives mathematical analysis, design and operation of converter and MPPT techniques. In addition, steady state and dynamic performance of MPPT techniques are also analysed. The simulations are performed under MATLAB/Simulink environment.

Development of fuzzy logic controller for improved interline unified power quality conditioner

Abstract: This paper presents the improved interline unified power quality conditioner (iUPQC) and its controlling aspects for nonlinear loads. The nonlinear loads are the major sources of harmonics and raise the power quality issues. However, the iUPQC compensates the harmonics that are generated by a nonlinear load besides reactive power support. This in turn minimises the harmonic distortion both in the source current as well as voltage. Furthermore, it also provides the current and voltage imbalance compensations, reactive power, frequency and voltage support at grid. The simulation of entire power system is fulfilled using proposed FUZZY controller and compared with the conventional PI controller. The performance of both the controllers is sifted in terms of % total harmonic distortion (THD) by considering different case studies having the 3-φ diode rectifier connected to R, RL and RLE loads. The MATLAB/Simulink version R2012b is used for accomplishing the in depth simulation studies.

Performance analysis and design optimisation of 3-⌀ Packed U Cell inverter for industrial drive applications

Abstract: Nowadays, the importance for multilevel inverters is getting more and more in the field of medium and high power applications. This paper discusses Packed U Cell (PUC) multilevel inverter which is the most advanced topology. The figure of merit of this topology is reduction in the number of switches as level increases. Hence, it reduces the cost implementation besides topology complexity compared to other existing topologies such as neutral-point clamping (NPC), flying capacitor (FC), cascaded H-bridge (CHB) and hybrid cascaded H-bridge (HCHB). Furthermore, there is no need of transformers in this whole concept. Hence, it avoids the bulky installations. The 3-⌀ induction motor is fed with 7, 15 and 31 levels Packed U Cell (PUC) inverter topologies individually. The stator current, speed response and electromagnetic torque is shown for each level. The performance of induction motor is analysed in terms of % torque ripples and % total harmonic distortion (%THD). The whole simulations are carried out by using MATLAB/Simulink version R2012b.

Robust Sliding Mode H∞ Controller of DFIG Based on Variable Speed Wind Energy Conversion System

Abstract: In this study, a Sliding Mode (SM) methodology combined with a robust H∞ control scheme (SM-H∞) was proposed to control the stator active and reactive power generated by the Doubly Fed Induction Generator (DFIG). The purpose of the proposed controller is to improve the DFIG stator active and reactive power tracking performances by reducing chattering phenomena under variable wind speed, which provides major drawbacks of conventional SM controllers. The H∞ technique was used to define the SM attractive control part, which helps to reduce chattering phenomena and improves robustness in the presence of parameter variations and wind speed changing. The DFIG stator was directly connected to the grid and, its rotor was linked to the grid through a back-to-back converter. The proposed approach was tested using Matlab/Simulink and a comparison with the conventional SM and the SM fuzzy logic controllers was carried out. The results of simulation illustrated an effectiveness of the proposed SM-H∞ controller even in the presence of the DFIG parameter variations and speed changing compared with the other techniques.

DPC Based on ANFIS Super-Twisting Sliding Mode Algorithm of a Doubly-Fed Induction Generator for Wind Energy System

Abstract: Received: 15 October 2019 Accepted: 8 December 2019 Conventional direct power control (DPC) using two hysteresis comparators and switching table for a doubly fed induction generator (DFIG) integrated in a wind turbine system (WTS) have some drawbacks such as harmonic distortion of voltages, reduced robustness and powers ripples. In order to resolve these problems, a super-twisting sliding mode control (STSMC) scheme based on adaptive-network-based fuzzy inference system (ANFIS) algorithm is employed. The validity of the employed approach was tested by using Matlab/Simulink software. Interesting simulation results were obtained and remarkable advantages of the proposed strategy were exposed including simple design of the control system, reduced powers ripples as well as the other advantages.

Influence of Replacement of Sodium Lamps in Park Luminaires with LED Sources of Different Closest Color Temperature on the Effect of Light Pollution and Energy Efficiency

Abstract: According to the European Union (EU) regulations, EU members are obligated, among others, to improve the energy efficiency in the outdoor lighting sector. One of the ways to consider this fact is to install LED sources in luminaires. Due to the reasonable lighting requirements for the lighting of squares and parks, the cheapest way to modernize lighting is to replace conventional discharge lamps with LED sources in park luminaires. Using nine typical park luminaires, the influence of replacing classic sodium lamps with LED sources on the effect of light pollution and energy efficiency was analyzed. Using data, such as a photometric solid and a relative spectral distribution, simulation calculations were carried out in DIALux software and our own calculation tool to consider this issue. The studies considered 156 LED sources of different spectral distributions and a wide range of color temperatures from 1000 K to 9753 K as well as different color rendering index (CRI) values. The conducted studies showed that the replacement of sodium lamps with LED sources is not necessarily associated with an increased negative impact on the effect of light pollution. It was also found also that the CRI value has an influence on the degree of light pollution.

A Comprehensive Overview of Electric Vehicle Batteries Market

Abstract: As there is growth in the population rate in the past few years, the number of vehicles on the roads has also increased. Thus, emissions of CO2 and hydrocarbons have risen, drastically. This problem has led to the success of the battery market, mostly in Electric Vehicle (EV) industry. Numerous research studies are going into the field of battery technology. The battery market is a Billion-Dollar market, annually. According to a market research report, the global battery market size in 2014 was 62 Billion US Dollars. Lead-Acid, Nickel Metal Hydride, and Lithium-ion batteries are the commonly used types of batteries for Electric-Drive Vehicles (EDVs), including Battery Electric Vehicles (BEVs), Hybrid Electric Vehicles (HEVs), and Plug-in Hybrid Electric Vehicles (PHEVs). Such batteries are mainly used in automotive and traction applications. They also find their applications in backup and emergency power for electrical installations. In addition, those types of batteries can be found in submarines and Uninterruptible Power Supplies (UPSs). Lead-Acid, Nickel Metal Hydride, and Lithium-ion batteries are very popular as they are low cost and have high durability. This paper aims to emphasize various aspects relating to the economics of Lead-Acid, Nickel Metal Hydride, and Lithium-ion batteries and the market dynamics, which affect the battery industry. In this paper, the cost performances of the Lead-Acid, Nickel Metal Hydride, and Lithium-ion batteries over the years and their impacts on the EV industry are evaluated. Finally, the current situation of Lead-Acid, Nickel Metal Hydride, and Lithium-ion batteries markets are discussed. This paper indicates the market landscape and its growth prospects over the upcoming years.