Symmetry method for obtaining mlutiterminal direct current power network nonlinear active power flow

A multi-terminal DC and power grid technology, applied in AC network circuits, AC networks with the same frequency from different sources, electrical components, etc., can solve problems such as unreasonable, asymmetric acquisition methods, and non-unique acquisition results.

Inactive Publication Date: 2016-07-06
SHENZHEN UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide a symmetrical method for obtaining the nonlinear active power flow of the multi-terminal DC power network, aiming at solving the asymmetry of the acquisition method and the non-uniq

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  • Symmetry method for obtaining mlutiterminal direct current power network nonlinear active power flow
  • Symmetry method for obtaining mlutiterminal direct current power network nonlinear active power flow
  • Symmetry method for obtaining mlutiterminal direct current power network nonlinear active power flow

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[0015] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0016] An embodiment of the present invention provides a symmetrical method for acquiring nonlinear active power flow in a multi-terminal DC power network, which includes the following steps:

[0017] According to the known parameters of the multi-terminal DC power network and the active power injected by the nodes, the symmetric nonlinear indeterminate equations of the active power injected by the nodes with respect to the offset of the node voltage are established;

[0018] According to the symmetric nonlinear indeterminate equations of node injected active power with respect to node voltage offs...

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Abstract

The invention relates to a symmetry method for obtaining multitermianl direct current power network nonlinear active power flow. First a symmetric nonlinear indeterminate equation system (S1) of node injected active power with respect to node voltage offset is buit, then a symmetric linear linear indeterminate equation system (S2) of a node injected active power increment with respect to a node voltage offset increment is built according to the symmetric nonlinear indeterminate equation system, node voltage offset of each node and the total quantity of node voltage (S3) in the multiterminal durect current power network are obtained according to the symmetric linear indeterminate equation system and known node injected active power, and finally nonlinear active power flow (S4) of each branch in the multiterminal durect current power network is obtained according to the node voltage offset of each node in the multierminal direct current power network, whrein the node voltage offset of all nodes in the multiterminal direct current power network is equally treated, the obtained all node voltage offset always draws close to zero, a reference node does not need to be selected, and obtained nonlinear active power flow is uniqud and reasonable.

Description

technical field [0001] The invention belongs to the field of electric power engineering, and in particular relates to a symmetrical method for obtaining the nonlinear active power flow of a multi-terminal DC power network. Background technique [0002] Currently, multi-terminal DC power grids are booming with the development of renewable energy generation. This kind of power network is inseparable from the nonlinear active power flow in both the planning and operation stages. The acquisition method of the nonlinear active power flow is an important tool to ensure the efficient planning and operation of the multi-terminal DC power network. [0003] The existing method for obtaining nonlinear active power flow in a multi-terminal DC power network needs to manually select a node in the multi-terminal DC power network and specify its voltage. This node is called a reference node. Differences in the preferences of different personnel will cause them to choose different reference...

Claims

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Application Information

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IPC IPC(8): H02J3/06
CPCH02J3/00H02J3/06
Inventor 江辉彭建春
Owner SHENZHEN UNIV
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