A Two-Stage Economic Dispatch Method Considering the Flexible Climbing Capacity Provided by Wind and Storage

Abstract

The present invention relates to a two-stage economic scheduling method considering the flexible climbing capacity provided by wind power storage, including steps: 1) according to the scheduling time scale, obtain the ability of wind power, photovoltaic, energy storage to provide upward FRC and the ability to provide downward FRC; 2) Combining the ability of the three to provide FRC, according to the actual system operation conditions, the system adopts wind power, photovoltaic and energy storage to complement each other to provide FRC, and establish a two-stage economic dispatch model; 3) For the future 24h wind power, photovoltaic and energy storage Forecast the load, input the prediction results into the unit combination model of the day, and obtain the start-up and shutdown plan and approximate output plan of the conventional unit; 4) input the output results of the model into the real-time economic dispatch process, and provide FRC for wind power, photovoltaic and energy storage. Check and adjust. Compared with the prior art, the invention has the advantages of lightening the burden of conventional units, reducing the probability of FRC deficiency, improving the flexibility of 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

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