Method and apparatus for controlling energy transfer of DC distribution network

Abstract

The invention discloses a method and apparatus for controlling the energy transfer of a DC distribution network. The method comprises the following steps: firstly, dividing a scheduling period into N scheduling time segments; and then collecting load predicted data, output predicted data of renewable energy, the time-of-use power price of an AC power grid, and the power generation cost of a controllable generator in a scheduling period; and then establishing a objective function by using economic cost as a control objective and by using the power balance constraint in the distribution network, the power constraint of a converter and the controllable generator, the energy constraint of an energy storage system as constraints, subjecting the objective function to optimization computation to obtain scheduling instructions of the controllable generator and the energy storage systems in respective scheduling time segments within the scheduling period; finally, controlling the controllable generator and the energy storage systems in accordance with the scheduling instructions. By optimizing the operation state and the control instructions of the controllable unit in the DC distribution network, the method enables the system realize efficient use of limited resources under the condition of satisfying the safe and reliable operation.

Description

technical field [0001] The invention belongs to the field of DC power distribution in power systems, and in particular relates to a method and device for controlling energy transmission in a DC power distribution network. Background technique [0002] With the improvement of users' demand for power quality, the demand for distributed new energy and energy storage systems to connect to the distribution network is increasingly strong, and with the wide application of power electronic equipment, the traditional AC distribution network has become increasingly unable to meet the needs of modern Society's demand for electricity. DC distribution network has attracted more and more attention and research in recent years due to its unique advantages, such as high reliability, good economy, favorable for distributed energy access and high power quality. . [0003] like figure 1 As shown in the figure, a typical medium-voltage annular DC power distribution network, in which the A te...

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Problems solved by technology

[0005] The purpose of the present invention is to provide an energy transmission control method for a DC distribution network, which is used to solve the problem of unreasonable economics in the energy transmission control method when distributed energy sources are connected to the distribution network; the present invention also provides a method An energy transmission control device for a direct current distribution network, used to implement a control method for energy transmission

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