Korada Nikhil

Bio: Korada Nikhil is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Smart grid & Base load power plant. The author has an hindex of 2, co-authored 3 publications receiving 16 citations.

Application of hybrid energy storage system in a grid interactive microgrid environment

Abstract: Integration of renewable energy sources (RES) into the ac grid is growing very rapidly to meet the high and reliable load demand. The penetration of this growing microgrid structures within the distribution network are leading to several challenging power quality issues. It is mandatory to maintain the voltage and frequency within the prescribed limits at the local bus under any condition of the renewable sources and load. It is a known fact that the behaviour of RES, loads are unpredictable and the need for energy storage system (ESS) becomes extremely important. The sharing of power among grid, RES and storage plays a very vital role for the stable operation of grid integrated microgrid system. Also, the energy storage devices (ESD) need to be operated within its safe limits. Hence a simple control algorithm for power management is being formulated to generate references for RES, ESS interfaced power electronic converters and grid connected converter to mitigate the power imbalance within the dc grid and support sudden frequency variations of the ac grid. Further this method also improves the power quality condition of the ac system. The proposed algorithm is tested and validated using MATLAB based Simulink environment.

Power management based on the operating conditions of grid, mircogrid and hybrid storage

Abstract: Distributed generation (DG) is nowadays increasing in the power sector at a level that it is reducing the conventional power generation. The increased usage of these systems near to the load centers has several power quality aspects to deal with. In order to elicit the maximum power from the renewable energy sources (RES) many control algorithms are available, but these methods lack the impact of sudden load changes and unpredictable behaviour of RES. To support the system during these dynamic changes additional power units are necessary to meet the condition of overall power balance. A combination of battery and supercapacitor based hybrid storage can be employed in this scenario. Also with these abnormalities of RES and loads, the voltage and frequency profiles at the customer end will also be affected. Under such a condition of grid, RES and loads an appropriate algorithm with all these conditions taking into consideration need to be formulated to operate the RES, storage based converters and grid interfacing converter to act as per the situation of the system. This improves the reliable operation of the interconnected system under any kind of variations. Hence an adaptive control algorithm is proposed and it is implemented on the grid integrated RES system along with the energy storage devices (ESD) in the MATLAB/Simulink and the various cases validate the results.

Battery/supercapacitor based grid integrated microgrid with improved power quality features

Abstract: In this paper, application of battery and supercapacitor units based hybrid energy storage system (HESS) integrated to the grid interactive microgrid environment is presented. HESS is nowadays most widely used in the electric vehicles, energy reserves, renewable energy sources (RES)based applications. These energy storage systems can also be added to the existing power conditioning units to improve their inherent compensation capabilities. Effective voltage and current compensation are achieved using a single inverter topology with the usage of HESS into the system. Also the current stresses occurred due to dynamic changes in load and RES are diverted to supercapacitor packs, which relieves the battery units and improves its lifespan. The participation of these HESS is controlled based on the state of charge (SoC) status to have safe and reliable operation. A control strategy is being formulated to tackle the compensation performance using the HESS units. The proposed strategy is tested and validated using MATLAB based simulink environment.

Review of Energy Storage System Technologies in Microgrid Applications: Issues and Challenges

Abstract: A microgrid (MG) is a local entity that consists of distributed energy resources (DERs) to achieve local power reliability and sustainable energy utilization. The MG concept or renewable energy technologies integrated with energy storage systems (ESS) have gained increasing interest and popularity because it can store energy at off-peak hours and supply energy at peak hours. However, existing ESS technology faces challenges in storing energy due to various issues, such as charging/discharging, safety, reliability, size, cost, life cycle, and overall management. Thus, an advanced ESS is required with regard to capacity, protection, control interface, energy management, and characteristics to enhance the performance of ESS in MG applications. This paper comprehensively reviews the types of ESS technologies, ESS structures along with their configurations, classifications, features, energy conversion, and evaluation process. Moreover, details on the advantages and disadvantages of ESS in MG applications have been analyzed based on the process of energy formations, material selection, power transfer mechanism, capacity, efficiency, and cycle period. Existing reviews critically demonstrate the current technologies for ESS in MG applications. However, the optimum management of ESSs for efficient MG operation remains a challenge in modern power system networks. This review also highlights the key factors, issues, and challenges with possible recommendations for the further development of ESS in future MG applications. All the highlighted insights of this review significantly contribute to the increasing effort toward the development of a cost-effective and efficient ESS model with a prolonged life cycle for sustainable MG implementation.

A Review on the Selected Applications of Battery-Supercapacitor Hybrid Energy Storage Systems for Microgrids

Abstract: This paper presents a comprehensive categorical review of the recent advances and past research development of the hybrid storage paradigm over the last two decades. The main intent of the study is to provide an application-focused survey where every category and sub-category herein is thoroughly and independently investigated. Implementation of energy storage systems is one of the most interestingly effective options for further progression in the field of alternative energy technology. Apart from a meticulous garnering of the energy resources regulated by the energy storage, the main concern is to optimize the characteristic integrity of the storage devices to achieve a practically techno-economic size and operation. In this paper, hybrid energy storage consisting of batteries and supercapacitors is studied. The fact that the characteristic of batteries is mostly complementary to that of supercapacitors, hybridizing these storage systems enhances their scope of application in various fields. Therefore, the objective of this paper is to present an inclusive review of these applications. Specifically, the application domain includes: (1) regulation of renewable energy sources, (2) contributions to grid regulation (voltage and frequency compensation, contribution to power system inertia), (3) energy storage enhancements (life cycle improvement, and size reduction), (4) regenerative braking in electric vehicles, (5) improvement in wireless power transfer technology. Further, this review also descriptively highlights the control strategies implemented in these domains of applications. The application-oriented review explicates the principle advantages with the hybridization of battery and supercapacitor energy storage systems that can be used as an insight for further development in the field of energy storage technology and its applications.

Optimal design of a diesel-PV-wind system with batteries and hydro pumped storage in a Colombian community

Abstract: This paper proposes to use a combinatorial optimization technique, the branch and cut algorithm, to design an hybrid isolated microgrid in the Colombian community of Unguia. In addition, this paper presents a comparison between the designs obtained with the branch and cut algorithm, the software HOMER and a genetic algorithm for the Unguia community. The proposed microgrid includes two diesel generators whose infrastructure already exists in the community, photovoltaic panels, wind turbines and two storage systems: batteries and hydro-pumped storage. The goal of the design is to dimension the hydro-pumped storage tank, pump, hydraulic turbine, and to choose the number of batteries, panels and wind turbines that minimize the annual costs and CO2 system emissions. The proposed designs ensure a level of reliability on the system. Simulation results show that the design with the branch and cut algorithm have the lowest cost for the Unguia microgrid.

Power management of grid connected hybrid microgrid with dual voltage source inverter

Abstract: This paper proposes a grid connected hybrid microgrid system with dual voltage source inverter (DVSI) using modified instantaneous symmetrical component theory (MICST) for power sharing among inverters. In this paper a reduced DC link voltage has been achieved, efficient, simple power management algorithm (PMA) is proposed and new method is introduced for DVSI control parameter extraction which reduces control complexity and overall system cost. The Proposed topology consists of a three phase dual voltage source inverter (DVSI) which transfers the active power between grid and microgrid based on renewable power availability and state of charge (SOC) limits of hybrid energy storage system (HESS). Besides, offering ancillary services such as harmonic mitigation, reactive power support and unity power factor at the point of common coupling (PCC). The proposed system is tested and validated using MATLAB based Simulink environment.

Hydrogen-Based Energy Storage Systems: A Review

Abstract: Conventional energy sources are based on fossil fuels and have several impacts including pollution, global warming, and high cost in addition to that they are nonrenewable and running fast. Renewable energy resources such as solar and wind energy are promising alternatives. However, one of the major limitations of renewable energy sources is that they provide us with discontinuous energies and most of them are unavailable all the time. As a result, to provide continuous power, these energy resources should be integrated with energy storage systems. This paper overviews the different storage approaches and focuses on Hydrogen-based energy storage methods. It presents the state-of-the-art hydrogen storage methods and addresses the technical challenges in this field.