Abstract
Wind power varies over time, mainly under the influence of meteorological fluctuations. The variations occur on all time scales. Understanding these variations and their predictability is of key importance for the integration and optimal utilization of wind in the power system. There are two major attributes of variable generation that notably impact the participation on power exchanges: Variability (the output of variable generation changes and resulting in fluctuations in the plant output on all time scales) and Uncertainty (the magnitude and timing of variable generation output is less predictable, wind power output has low levels of predictability). Because of these variability and uncertainty wind plants cannot participate to electricity market, especially to power exchanges. For this purpose, the paper presents techno-economic analysis of work of wind plants together with combined cycle gas turbine (CCGT) plant as support for offering continues power to electricity market. A model of wind farms and CCGT plant was developed in program PLEXOS based on real hourly input data and all characteristics of CCGT with especial analysis of techno-economic characteristics of different types of starts and stops of the plant.The Model analyzes the followings: costs of different start-stop characteristics (hot, warm, cold start-ups and shutdowns) and part load performance of CCGT. Besides the costs, the technical restrictions were considered such as start-up time depending on outage duration, minimum operation time, and minimum load or peaking capability.For calculation purposes, the following parameters are necessary to know in order to be able to economically evaluate changes in the start-up process: ramp up and down rate, time of start time reduction, fuel mass flow during start, electricity production during start, variable cost of start-up process, cost and charges for life time consumption for each start and start type, remuneration during start up time regarding expected or unexpected starts, the cost and revenues for balancing energy (important when participating in electricity market), and the cost or revenues for CO 2 -certificates. Main motivation for this analysis is to investigate possibilities to participate on power exchanges by offering continues guarantied power from wind plants by backing-up them with CCGT power plant.
Highlights
Today energy market is very uncertain and represents a great challenge for new investments
The option considered in this paper is balancing the wind production with production from CCGT power plants taking into account production cost of three different models of CCGT – model with one, two and three gas turbines and one steam turbine
Analysis is related to the technical ability, i.e. flexibility of the CCGT power plants for following variable production of the wind,whereas this type of drive CCGT depends on the nature of the wind in the area, frequent switching of CCGT plant and the associated high costs are expected
Summary
Today energy market is very uncertain and represents a great challenge for new investments. Renewables represent a clear energy and they don’t produce GHG emissions, but they have intermittent nature (wind and solar), their geographical distribution is typically uneven and the variability of renewables requires more operational flexibility to compensate fluctuations. This problem limits their participation in the energy market. On the other hand, having huge share of stochastic renewables as wind and solar creates need in the system for balancing, especially when the produced electricity is lower than we expected This working regime forms peaks and gaps and solutions are energy storages, pumped hydro, OCGT and CCGT plants. THE OUTLINE OF THE PROBLEM AND METHODOLOGY Objective of this resarch is to examine, on the basis of the model, technical and economic indicators of the CCGT power plant in function of balancing or stabilizing variable electrical production from wind farms according to the different number of gas turbines
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