H. Johal

GE Global Research, Niskayuna, New York, United States

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Publications (5)0 Total impact

  • H. Johal · K. Anaparthi · J. Black
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    ABSTRACT: Demand Response has been conventionally used as a resource to support the grid under steady state operating conditions by peak shifting or leveling the electrical load. The characteristics of responsive demand resources can also be used to support the grid during emergency and contingency conditions. Demand resources can respond very fast to provide ancillary services such as frequency regulation and operating reserves for the bulk grid; while the distributed nature of the resource can help in better solving local feeder level problems such as phase balancing, cold load pick up, etc. This paper presents some of these applications of demand response to support the grid under different time scales of operation; ranging from seconds to hours. The analysis will compare before and after benefits from using demand response, a controls strategy for using demand response, and its interface with the legacy grid controls for the above mentioned demand response applications.
    Energy Conversion Congress and Exposition (ECCE), 2012 IEEE; 01/2012
  • P. Newland · A. Roberts · M. Brandao · H. Johal
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    ABSTRACT: Energy Storage is being considered as the game changer by the power industry. For a distribution utility Energy Storage brings the promise of a grid with improved asset utilization, improved reliability and power quality. However, presently Energy Storage technologies are perceived as too costly. Therefore, the question for the presentation paper is threefold: First, identify the benefits of Energy Storage utilization for of a distribution utility, secondly, discuss the challenges associated with attributing a value to those services, and thirdly attempt to put a value against one of the potential benefits (peak shaving) and assess its impacts in 4 scenarios. Representative data from ENERGEX network and Energy Storage Technologies is used and simulations are performed to answer these questions.
    Power System Technology (POWERCON), 2012 IEEE International Conference on; 01/2012
  • H. Johal · D. Manz · K. O'Brien · J. Kern
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    ABSTRACT: Electricity as a commodity is markedly different from other commodities in the sense that it must, in general, be consumed when it is produced. The capability to store energy for a later use can help to improve the flexibility of power system operation by providing control of power as and when required. With a strong push towards increasing the reliance on renewable energy resources, a flexible power system is desired; one that can accommodate increased variability and uncertainty of generating resources. Energy storage is one strategy for enhancing the flexibility of power system operation. The application for energy storage can be broadly classified into energy applications (bulk transfer of energy from one time to another) and power applications (fast injection/absorption of power). There is also a broad spectrum between energy and power applications. The selection of a storage system as a means of adding flexibility to the grid depends upon a number of factors: cost being an important one. Other strategies that can offer flexibility in today's power system include demand response and fast-start generation with high ramping potential.
    Power and Energy Society General Meeting, 2011 IEEE; 01/2011
  • M. Brandao · H. Johal · L. Ion
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    ABSTRACT: Energy Storage has always been an attractive proposition for utilities. In fact, having more flexibility in managing demand and supply of electricity can help to improve the operational stability and efficiency of the power system which is an objective of both electricity industry and governments. Energy Storage has the capability of being the mediator between demand and supply and its adoption would increase the flexibility of the electricity supply system. In particular, on the Low Voltage side, DNSPs could benefit from having distributed storage in particular points on the grid. Storage could take the form of new systems or use spent EV batteries with enough capability for grid-connected stationary applications. There are a range of different benefits that can be harvested by different actors in the electricity value chain, which makes the task of identifying the value proposition for Energy Storage in LV systems a rather complex one. The Energy Storage device can be owned and/or operated by one of the identified actors. Whichever ownership and control method is chosen, there are important challenges in the creation of market rules for appropriate valuation of the benefits from distributed storage. Suggestions for more research are given.
    Innovative Smart Grid Technologies Asia (ISGT), 2011 IEEE PES; 01/2011
  • H. Johal · Wei Ren · Yan Pan · M. Krok
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    ABSTRACT: Electric distribution grid is operated under a number of constraints in order to deliver power at a certain quality and reliability level. Electrical devices, such as capacitor banks, voltage regulators, and load tap changers are employed by the utilities to facilitate and support the operation of the distribution grid, while respecting many constraints, such as maintaining an acceptable band of voltage magnitude and a certain level of power factor. Traditionally, these devices are operated under fixed schedules, based on time of day or some other local parameters, and their operations are disjointed from one another, resulting in a decreased overall effectiveness of operation. This paper presents an approach to realize an integrated control and operation of these devices that will enable a more optimal operation of the grid. Simulation studies are performed on the IEEE test feeder network and the results highlight increased efficiency of grid operation in terms of decreased line losses, increased power factor, and improved voltage profile.
    Innovative Smart Grid Technologies Conference Europe (ISGT Europe), 2010 IEEE PES; 11/2010