A power system scheduling method considering wind power ramping characteristics

Abstract

The invention belongs to the dispatching field of an electric power system, and specifically relates to a coordinative dispatching method for a wind-fire joint system considering a wind power climbing characteristic based on a load-balancing algorithm, for solving the problem that wind-electricity power vacancy cannot be balanced by backup capacity of a system when a wind-power climbing accident occurs after large-scale wind power grid connection; the method comprises the steps of adopting a conventional dispatching strategy according to an electric power system dispatching model considering the wind power climbing characteristic, and determining whether load shedding occurs in the system within a dispatching time frame or not; if the system suffers from a load shedding phenomenon, obtaining conventional unit output in the system load shedding moment and all previous moments and actual backup requirements of the system at each moment within the dispatching time frame; determining whether the system needs to be treated in a manner of wind power abandonment or not; and calling the load-balancing algorithm, updating the conventional unit output before the system load shedding moment, then continuing to participate in the dispatching by the updated conventional unit output until the dispatching is completed. The invention provides the re-dispatching method for the conventional unit output based on the load-balancing algorithm; the proposed method further applies to dispatching of the wind-fire system; and by formulating the joint dispatching strategy, the decreasing of wind-electricity power caused by the wind-power climbing accident can be effectively balanced by the conventional unit, so that the actual climbing capacity requirement of the system can be ensured.

Description

technical field [0001] The invention belongs to the field of electric power system dispatching, and in particular relates to a coordinated dispatching method of a wind-fired combined system based on a load balancing algorithm and considering the climbing characteristics of wind power. Background technique [0002] At present, with the rapid development of the economy, the world is facing the double pressure of the depletion of non-renewable energy sources and serious environmental pollution. As an indispensable form of energy in today's society, electric energy is also facing a major change in the form of production. The grid-connected scale of wind power and other renewable energy power generation is increasing year by year. The form of wind power generation has the advantages of being clean and renewable, which is of great significance to the development of a resource-saving and environment-friendly society in my country. At the same time, due to the influence of climate a...

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Problems solved by technology

Liu Tianqi, He Chuan, Hu Xiaotong and others designed an optimal control method for wind power ramping (patent number 201510770528.1), Li Xiangjun, Ning Yangtian, Huidong et al. designed a multi-objective energy storage method considering the wind power ramp rate and operating costs Control method and system (Patent No. 201410742099.2), but both of them use energy storage to stabilize the power shortage caused by wind power climbing events. Due to the high cost of energy storage equipment, it cannot be used on a large scale

Qi Yongzhi and Liu Yutian designed a wind power ramping cooperative control system and method based on competitive game (Patent No. 201310194192.X), but it improves the wind power ramping characteristics through the cooperative control among wind farm groups, if only relying on The slope control of the wind farm group has certain limitations and the economy is not high

Generally speaking, there are few studies on power system dispatching considering the characteristics of wind power ramping, and energy storage equipment is mostly used to stabilize the power shortage in the process of wind power ramping, but the cost is high. The new solution for system optimization scheduling has certain practical application value

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