Line voltage based earth-free power distribution network three-phase power flow calculation method

A technology of three-phase power flow and calculation method, applied in calculation, electrical components, circuit devices, etc., can solve the problem that the three-phase power of PQ node cannot be completely independently controlled, the apparent power of each phase cannot be fully known, and cannot be accurately calculated Issues such as power flow distribution and operation status of ungrounded distribution network

Inactive Publication Date: 2016-06-22
CHONGQING UNIV
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Problems solved by technology

[0007] 3) This method considers that the three-phase power of the PQ node cannot be completely independently controlled, that is, the apparent power of each phase c

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  • Line voltage based earth-free power distribution network three-phase power flow calculation method
  • Line voltage based earth-free power distribution network three-phase power flow calculation method
  • Line voltage based earth-free power distribution network three-phase power flow calculation method

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Embodiment Construction

[0104] The present invention will be further described below in conjunction with the examples, but it should not be understood that the scope of the subject of the present invention is limited to the following examples. Without departing from the above-mentioned technical ideas of the present invention, various replacements and changes made according to common technical knowledge and conventional means in this field shall be included in the protection scope of the present invention.

[0105] Such as Figure 1-2 As shown, taking the IEEE13 node system as an example, the specific steps of a three-phase power flow calculation method based on a three-wire ungrounded distribution network are as follows:

[0106] (1) Input basic data and initialization

[0107] 1) Enter basic data

[0108] First, input the structure and parameter information of the network, that is, the branch resistance and reactance of the network; input the power of each node load relative to the neutral point; the

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Abstract

The invention discloses a line voltage based earth-free power distribution network three-phase power flow calculation method. Structural data and parameter information of the network, control information of PV nodes and node load information are input based on programs through a computer, and the information is initialized; then the node admittance matrix and the jacobian matrix constant term of the network based on the line voltage are calculated; next, a node current unbalance equation of the network unbalance nodes, a power constraint equation of constant current star-shaped load nodes, a general active power constraint equation of the PV nodes and a line voltage amplitude constraint equation are taken into comprehensive consideration; the real and imaginary parts of the respective node line voltages FORMULA as shown in the specification, the real and imaginary parts of the injection current FORMULA as shown in the specification, of the constant current star-shaped load nodes, and the real and imaginary parts of the injection current FORMULA as shown in the specification, of the PV nodes are taken as the state variables; the Newton-Raphson algorithm is adopted based on the injection current ways to calculate the corresponding unbalance amount and the jacobian matrix; and finally the state variables are updated and convergence judgment is carried out to realize the earth-free power distribution network three-phase power flow calculation.

Description

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Claims

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Application Information

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Owner CHONGQING UNIV
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