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Day-ahead scheduling method for flexible direct-current power transmission system containing pumped storage and new energy power generation

A power transmission system, flexible DC technology, applied in AC networks, photovoltaic power generation, electrical components, etc. with energy trade/energy transmission authority

Active Publication Date: 2020-08-11
TSINGHUA UNIV +3
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Problems solved by technology

Therefore, the current day-ahead scheduling strategy is no longer applicable to the operation scheduling requirements of pumped storage and new energy power generation systems connected through flexible direct current transmission lines

Method used

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  • Day-ahead scheduling method for flexible direct-current power transmission system containing pumped storage and new energy power generation
  • Day-ahead scheduling method for flexible direct-current power transmission system containing pumped storage and new energy power generation
  • Day-ahead scheduling method for flexible direct-current power transmission system containing pumped storage and new energy power generation

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Embodiment Construction

[0085] The present invention proposes a day-ahead scheduling method for a flexible direct current transmission system including pumping storage and new energy power generation. The present invention will be further described in detail below in conjunction with specific embodiments.

[0086] The present invention proposes a day-ahead scheduling method for a flexible direct current transmission system including pumping storage and new energy power generation, which includes the following steps:

[0087] 1) Calculate the output prediction relative error of all new energy stations in the flexible DC transmission system (the new energy stations include wind farms and photovoltaic power stations in the present invention) at each historical sampling point, and establish the corresponding output of each new energy station Forecast relative error probability model. Specific steps are as follows:

[0088] 1-1) Sampling the actual output data and predicted output data of all new energy ...

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Abstract

The invention provides a day-ahead scheduling method for a flexible direct-current power transmission system containing pumped storage and new energy power generation, and belongs to the technical field of power grid and energy storage system scheduling. The method comprises the steps of firstly establishing a relative error probability model for predicting the output of each new energy field station; according to the day-ahead output prediction data of all the new energy plant stations, establishing a new energy plant station day-ahead output prediction typical scene set, and calculating corrected day-ahead output measurement data of each new energy plant station under each day-ahead output prediction typical scene; and then establishing a day-ahead scheduling optimization model of the flexible direct-current power transmission system containing pumped storage and new energy power generation, and solving the model to obtain a water pumping and power generation operation plan of a day-ahead constant / variable speed unit, wherein the model is composed of an objective function and constraint conditions. According to the method, the day-ahead prediction output error of the new energy field station is considered in the day-ahead scheduling optimization model, the next day constant / variable speed pumped storage unit is reasonably arranged to operate, and sending and consumption of new energy power generation are realized on the premise of ensuring the constraint of the transmission power of the flexible direct current power transmission system.

Description

technical field [0001] The invention relates to the technical field of power grid and energy storage system dispatching, in particular to a day-ahead dispatching method for a flexible direct current transmission system including pumped storage and new energy power generation. Background technique [0002] Today, renewable energy power generation is connected to the grid on a large scale, providing an important support for the energy consumption of the whole society. However, since the output of renewable energy is mainly determined by external weather conditions. Therefore, changes in meteorological conditions will lead to strong fluctuations and intermittences in the output of renewable energy, which also brings many challenges to the operation and scheduling of the power system. Large-capacity energy storage technology can cooperate with renewable energy on the scale of time and space, effectively smooth the output fluctuation of its power generation, and realize the tran...

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Application Information

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IPC IPC(8): H02J3/46H02J3/38H02J3/00
CPCH02J3/008H02J3/381H02J3/46H02J2203/20H02J2300/24H02J2300/28Y02E10/56
Inventor 胡泽春曹敏健徐绍军马慧远
Owner TSINGHUA UNIV
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