IEC_Elctrical Energy Storage.pdf

Figure 1 1 comparison of daily load curves ieej the

Info icon This preview shows pages 11–13. Sign up to view the full content.

View Full Document Right Arrow Icon
their quick response capability. Figure 1-1 – Comparison of daily load curves (IEEJ – The Institute of Energy Economics, Japan, 2005) 2 In Germany such a modification, called “system services”, must be implemented in large wind power generators.
Image of page 11

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
S E C T I O N 1 The roles of electrical energy storage technologies in electricity use 12 1.2.3 Long distance between generation and consumption Consumers’ locations are often far from power generating facilities, and this sometimes leads to higher chances of an interruption in the power supply. Network failures due to natural disasters (e.g. lightning, hurricanes) and artificial causes (e.g. overload, operational accidents) stop electricity supply and potentially influence wide areas. EES will help users when power network failures occur by continuing to supply power to consumers. One of the representative industries utilizing EES is semi-conductor and LCD manufacturing, where a voltage sag lasting for even a few milliseconds impacts the quality of the products. A UPS system, built on EES and located at a customer’s site, can keep supplying electricity to critical loads even when voltage sag occurs due to, for example, a direct lightning strike on distribution lines. A portable battery may also serve as an emergency resource to provide power to electrical appliances. 1.2.4 Congestion in power grids This issue is a consequence of the previous problem, a long distance between generation and consumption. The power flow in transmission grids is determined by the supply and demand of electricity. In the process of balancing supply and demand power congestion can occur. Utility companies try to predict future congestion and avoid overloads, for example by dispatching generators’ outputs or ultimately by building new transmission routes. EES established at appropriate sites such as substations at the ends of heavily-loaded lines can mitigate congestion, by storing electricity while transmission lines maintain enough capacity and by using it when lines are not available due to congestion. This approach also helps utilities to postpone or suspend the reinforcement of power networks. 1.2.5 Transmission by cable Electricity always needs cables for transmission, and supplying electricity to mobile applications and to isolated areas presents difficulties. EES systems such as batteries can solve this problem with their mobile and charge/discharge capabilities. In remote places without a power grid connection recharging an electric vehicle may present a challenge, but EES can help realize an environmentally friendly transport system without using conventional combustion engines. 1.3 Emerging needs for EES There are two major emerging market needs for EES as a key technology: to utilize more renewable energy and less fossil fuel, and the future Smart Grid.
Image of page 12
Image of page 13
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern