A two-stage economic dispatching method considering the flexible climbing capacity provided by wind-solar storage

Abstract

The invention relates to a two-stage economic dispatching method considering flexible climbing capacity provided by wind-solar storage, which comprises the following steps: 1) according to dispatchingtime scale, obtaining wind power, photovoltaic and energy storage to provide upward FRC capability and downward FRC capability; 2) Combined with the ability of providing FRC, wind power, photovoltaicand energy storage are used to provide FRC, and two-stage economic dispatching model is established. 3) Forecasting wind power, photovoltaic power and load in the next 24 hours, and inputting the forecasting results into the unit commitment model before the day, so as to obtain the start-stop plan and approximate output plan of the conventional unit; 4) input that output result of the model intothe real-time economic dispatching proces to detect and adjust the FRC complementarily provided by the wind power, the photovoltaic power and the energy storage. Compare with the prior art, the invention has the advantages of lightening the burden of the conventional unit, reducing the probability of the FRC shortage, improving the flexibility of the system operation and the like.

Description

technical field [0001] The invention relates to the technical field of electric power systems, in particular to a two-stage economic scheduling method considering the flexible climbing capacity provided by wind and power storage. Background technique [0002] To maintain real-time power balance, the power system needs to be flexible enough to track and respond to changes in net load. Flexibility is an index to evaluate the system's tolerance to uncertainty, and the flexibility requirement mainly comes from the system power change caused by uncertainty. Flexible ramp capacity (FRC) is a flexibility index of the system, which represents the up / down schedulable capacity in response to load fluctuations. FRC is different from spinning reserve. Spinning reserve is generally used in emergency situations, such as line disconnection, generator outage, and sudden increase in net load caused by a sudden decrease in wind power and photovoltaic output. The capacity reserved for higher...

AI Technical Summary

Problems solved by technology

Existing research only uses wind power to provide FRC, and this type of research is currently only in the research stage and has no practical application

In addition, the existing technology provides the flexibility required by the system by using the characteristics of fast start-up and fast ramp rate in real-time dispatching. However, how to reduce the climbing pressure of conventional units and at the same time improve the overall economic benefits of system operation is still an issue. important issues to be addressed

Images