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2 Journal of Power Technologies

2 2015

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Economic assessment of gas-steam systems taking account of variable loads

100%

Chmielniak T. , Lepszy S. , Czaja D.

tom Vol. 95, spec.

54--62

Increasing competition from high-power gas technologies on the energy market depends on many factors. Apart from the requirement to meet ecological criteria, the most important of them are: an improvement in thermal flexibility, favourable characteristics of performance under variable loads and the economic efficiency related thereto. The adaptability of gas technologies to changes in loads in the 24-hour cycle is now gaining special importance. This paper is focused on issues related to adapting the methodology of economic calculations to changing functions of gas technologies in the electricity generation sub-sector. In the new market environment, the economic model comprising a certain number of parameters (which usually characterize the base load) and taking account of revenues coming from this type of operation does not provide a full picture. First and foremost, it does not indicate additional revenues that could potentially be earned from new market possibilities related to rendering system services and lessening the environmental impact. Generally speaking, a more accurate approach to the assessment of gas-steam systems has to take account of basic parameters that determine thermal flexibility (start-up and shutdown times), issues related to maintaining availability, changes in efficiency under variable loads and emissions characteristics.

Quantifying energy not served in power capacity expansion planning with intermittent sustainable technologies

67%

Poullikkas A.

2015

tom Vol. 95, nr 1

25--33

In this work, estimations are made of the energy not served (ENS) in a power capacity expansion problem in the case of integration of intermittent sustainable technologies. For this purpose, part of the power generation system of the United Arab Emirates (UAE) is examined. Five capacity expansion scenarios using sustainable power generation technologies are investigated, including the integration of carbon capture and storage (CCS) technologies and solar-based power generation systems (intermittent systems as well as dispatchable systems using thermal storage), and compared with the business as usual scenario (BAU) for various natural gas prices. Based on the input data and assumptions made, the results indicate that the BAU scenario is the least cost option. However, if the UAE move towards the use of sustainable power generation technologies in order to reduce carbon dioxide emissions, the most suitable alternative technologies are: (i) natural gas combined cycle technology integrated with CCS systems, and (ii) concentrated solar power systems with 24/7 operation. The other candidate sustainable technologies have a considerable adverse impact on system reliability since their dispatchability is marginal, leading to power interruptions and thus high ENS cost.