Risk-constrained self-scheduling of a fuel and emission constrained power producer using rolling window procedure

This work addresses a relevant methodology for self-scheduling of a price-taker fuel and emission constrained power producer in day-ahead correlated energy, spinning reserve and fuel markets to achieve a trade-off between the expected profit and the risk versus different risk levels based on Markowitz’s seminal work in the area of portfolio selection. Here, a set of uncertainties including price forecasting errors and available fuel uncertainty are considered. The latter uncertainty arises because of uncertainties in being called for reserve deployment in the spinning reserve market and availability of power plant. To tackle the price forecasting errors, variances of energy, spinning reserve and fuel prices along with their covariances which are due to markets correlation are taken into account using relevant historical data. In order to tackle available fuel uncertainty, a framework for self-scheduling referred to as rolling window is proposed. This risk-constrained self-scheduling framework is therefore formulated and solved as a mixed-integer non-linear programming problem. Furthermore, numerical results for a case study are discussed.     

Secure and economic management of a power system in the presence of wind generation

Nowadays, large-scale integration of wind power is a challenge in terms of the minimization of the insecurity risk, that is, of the expected cost associated with the expected load not served. In fact, when there is an elevated proportion of wind power, the electrical power quality in the sense of continuity of supply may be low, since energy from wind power cannot be dispatched in the classical sense and its output varies as weather conditions change. However, continuity of supply may also be undermined by other uncertain factors, such as the occurrence of random events like line outages, generator failures or sudden demand variations. Assuming the insecurity risk as a part of the overall expected cost for a secure management of a deregulated power system, this paper proposes a DC formulation of an AC Economically correct Secure Economic Dispatch (EcSED), modified also for the introduction of uncertain Wind Power Generation (WPG) sources. Finally, simulations were carried out in order to investigate how the above overall expected cost changes, as a function of varying penetration levels and varying installation locations of a WPG plant.     

NGN在陕西电力的应用前景

随着陕西电力通信“十一五”规划制订的逐步深入,对于NGN在陕西电力应用的讨论日趋激烈,因此,对NGN在陕西电力的应用前景进行客观地分析和评估显得尤为重要;文章首先从理论方面分析了在NGN认知方面存在的一些偏差;通过市场调研、技术交流、同行研讨等渠道来获取NGN在市场、技术、应用等方面的数据,并结合陕西电力通信的现状和实际需求,陕西电力“十一五”规划提出了针对NGN技术采取对策,进行技术跟踪和积极试点。