PROF. SAIFUR RAHMAN (IEEE LIFE FELLOW)
DIRECTOR, VIRGINIA TECH ADVANCED RESEARCH INSTITUTE, USA, PRESIDENT, IEEE POWER & ENERGY SOCIETY, 2018 AND 2019
Title: Role of the Smart Grid in Facilitating the Integration of Renewables
With the focus on environmental sustainability and energy security, power system planners are looking at renewable energy as supplements and alternatives. But such generation sources have their own challenges - primarily intermittency. It is expected that the smart grid – due to its inherent communication, sensing and control capabilities – will have the ability to manage the load, storage and generation assets (including renewables) in the power grid to enable a large-scale integration of distributed generation. In a smart grid, information about the state of the grid and its components can be exchanged quickly over long distances and complex networks. It will therefore be possible to have the integration of sustainable energy sources, such as wind, solar, off-shore electricity, etc. for smoother system operation. But in order for this to be possible, the electric utility will have to evolve, and change their ways of operation to become an intelligent provider of these services. This lecture introduces the operational characteristics of renewable energy sources, and various aspects of the smart grid - technology, standards and regulations. It also addresses the interplay among distributed generation, storage and conventional generation to provide an efficient operational strategy in the context of the smart grid.
PROF. TARLOCHAN S SIDHU
FACULTY OF ENGINEERING AND APPLIED SCIENCE, ONTARIO TECH UNIVERSITY CANADA
Title: Emerging Power Systems - Protection Challenges and Possible Solutions
Advent of renewable generation sources and recent introduction of electric vehicles have changed the conventional power systems to the ones where flow of power is no longer unidirectional. This change will not cause much disruption and issues if the levels of penetration are not significant. However, with the recent policies and incentives to promote green power as well as green transportation, it is expected that the levels of penetration will increase in the near future. In reality, there have been reports that some systems have already started experiencing this change and as such, have seen a number of operational issues including protection issues. It is imperative that power systems should be ready for this change to avoid future problems and loss of reliability. This talk will outline the protection challenges for the emerging power systems with high levels of penetration of renewable sources and electric vehicles. Short term and long-term solutions to overcome these issues will be discussed. The role that microgrids and smart grid can play in facilitating possible solutions will also be reflected.
PROF. BIDYADHAR SUBUDHI
PROFESSOR AND HEAD, SCHOOL OF ELECTRICAL SCIENCES, INDIAN INSTITUTE OF TECHNOLOGY, GOA
Title: Distributed Control Schemes of a Microgrid
A microgrid is a small-scale power system that facilitates integration of Distributed Generations (solar photovoltaic, and wind turbine etc.), local loads and energy storage units. This lecture discusses on design of distributed secondary control scheme of an AC microgrid modeled as a multi-agent system. The control objectives include microgrid voltage and frequency restoration and accurate active and reactive power-sharing among the distributed generators. The asymptotic controllers limit the convergence performance and hence are not suitable for fast-changing operating conditions. Therefore, a special emphasis is given to the finite-time convergence control approaches to achieve faster and flexible settling time for secondary control. The proposed control is fully distributed and each distributed generator communicates with its immediate neighbors for information sharing via a sparse communication network. The loss of communication link does not affect the controller performance. A dynamic average consensus-based distributed control scheme is designed for voltage and frequency synchronization that utilizes neighboring DG information. The control law forces the agents to move towards following the reference value, and causes the consensus among agents. The communication link delay analysis and upper bound on the allowable delay is derived in terms of the communication graph connectivity. It is observed that this control scheme provides good tracking performance. However, the scheme does not guarantee finite-time restoration. To deal with the sensitive loads and fast-changing operating conditions, and to obtain finite-time convergence, a distributed control scheme is then developed using the concept of cooperative control. A Lyapunov based stability and convergence analysis is presented which clearly shows that the convergence time is independent of microgrid system states and the microgrid line and load parameters.
PROF. SUKUMAR MISHRA
PROFESSOR AND ASSOCIATE DEAN R&D, DEPARTMENT OF ELECTRICAL ENGINEERING, INDIAN INSTITUTE OF TECHNOLOGY DELHI
Title: Grid Integration of Renewable Energy
Grid integration is the practice of developing efficient ways to deliver variable renewable energy (RE) to the grid. Robust integration methods maximize the cost-effectiveness of incorporating variable RE into the power system while maintaining or increasing system stability and reliability. A variety of approaches exist for estimating the capacity value of variable RE, as well as techniques that enable utilities and power system operators to use wind and solar to reliably meet electricity demand. Integrating distributed photovoltaic (PV) solar power results in unique benefits and challenges compared to the integration of utility-scale wind and solar power. Significant localized growth in PV can raise concerns such as voltage violations and reverse power flow in low-voltage distribution systems. However, various studies have shown that positive impacts (e.g., reduced line losses and avoided generation costs) can also result from distributed PV. Grid integration spans a variety of issues, including:
Grid integration studies illuminate the obstacles and opportunities that wind and solar integration could pose to a power system, helping to dispel grid integration myths and misperceptions that inhibit large-scale deployment. This talk will cover the technical aspects of control strategies and the various practical implementation challenges attached to the grid integration of renewable resources.
PROF. AKSHYA K. SWAIN
ASSOCIATE PROFESSOR OF ELECTRICAL AND COMPUTER ENGINEERING IN UNIVERSITY OF AUCKLAND, NEW ZEALAND
Title: Smartgrid: From the Perspective of Control Systems
Power generation from renewable energy sources (RESs) and their increasing penetration into the conventional grid is growing at a rapid pace around the world. However, the RESs are unpredictable and fluctuating in nature and often produce low power compared to traditional generation. The integration of variety of RESs into the traditional grid pose several challenges which include power quality issues, power fluctuations due to presence of a new source or plug and play feature of RESs, voltage and frequency deviation due to transition from grid-connected to stand-alone mode and vice versa and so on. Control is the key to mitigate some of the issues associated with the penetration of RESs. This presentation will therefore focus on discussing some of the advanced and popular control strategies including the feedback linearising controller, Lyapunov based controller, backstepping controller, reinforcement learning controller to solve the fault-ride through or low voltage ride through (LVRT) of mix/hybrid generation system.
MR. NABARUN ROY
CHIEF GENERAL MANAGER, POSOCO
Title: Challenges Associated with the Integration of Renewables Energy in Indian Grid
Renewable sources of energy such as solar or wind are not only clean but are also the cheapest form of power generation in most of the markets. Increased use of these sources reduces the overall greenhouse gas emission and has a better impact on the health of living beings. The future of mankind and industry is now dependent on Renewable Energy (RE), which is also good for the environment and the society. The world is focused on increased use of clean energy sources and is already undertaking various steps to promote clean and green renewable sources of energy to meet their power needs. By replacing our fossil-fuel infrastructure and building stronger RE generation, we can create a sustainable energy future and reduce the impact on climate change. Though the RE poses several benefits to society and industry, it also poses a lot of challenges. This talk will outline the practical experience of RE integration issue with the Indian National grid and many more challenges faced at Regional as well as National level. India aims to have 175 GW of RE sources connected to National grid by the year 2022, managing such quantum of RE is a challenging task for a power system operator. The challenges that the system operators are facing in running the Indian/Regional grid reliably shall be deliberated.