Voltage initial value setting method of load flow calculation with rectangular coordinate newton method

A rectangular coordinate, power flow calculation technology, applied in circuit devices, AC network circuits, electrical components, etc., can solve problems such as non-convergence

Inactive Publication Date: 2010-03-03
DALIAN MARITIME UNIVERSITY
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Problems solved by technology

[0103] It can be seen that the Cartesian Newton method power flow calculation may no

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  • Voltage initial value setting method of load flow calculation with rectangular coordinate newton method
  • Voltage initial value setting method of load flow calculation with rectangular coordinate newton method
  • Voltage initial value setting method of load flow calculation with rectangular coordinate newton method

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[0158] The present invention will be further described below in conjunction with the accompanying drawings. Adopt existing Cartesian coordinate Newton method power flow calculation method and Cartesian coordinate Newton method power flow calculation method of the present invention to Figure 5 and Figure 6 A calculation example of a simple 5-node power system shown is calculated, and the formula of the calculation method has been described in detail in Background Technology and Summary of the Invention, and will not be repeated here.

[0159] When the present invention sets the initial value of the voltage, the initial value of the real part of the voltage is first set for the small impedance branch whose real part of the voltage real part of only one terminal node has been set (see step C3). Before determining the voltage value of the impedance, an initial value of the real part of the voltage is set only for a small impedance branch whose real part of the voltage at both e...

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Abstract

The invention discloses a voltage initial value setting method of load flow calculation with a rectangular coordinate newton method, comprising the following steps: threshold value of a low impedancebranch circuit is determined, and the branch circuit less then the threshold value is defined as the low impedance branch circuit; initial value of a voltage image part is taken as 0.0, a set value ofa voltage real part of a PV node and a balance node is taken: the initial values of the real part of node voltage at two sides of the low impedance branch circuit are chosen, so as to meet the formula: ei=kej; the undetermined voltage initial value of the real part of the other nodes are taken as 1.0. By improving the voltage initial value setting method, the convergence problem of load flow calculation with the rectangular coordinate newton method can be effectively solved. The method has the characteristics of clear concept, simple programming and good convergence. The calculation only aimsat the low impedance branch circuit to specially choose, for a normal branch circuit, the initial value is chosen according to a level starting way still, thereby having not effect on the convergenceof the load flow calculation without a low impedance branch circuit system.

Description

technical field [0001] The invention relates to a power flow calculation method of an electric power system, in particular to a voltage initial value setting method for the rectangular coordinate Newton method power flow calculation. Background technique [0002] In the Cartesian coordinate Newton method power flow calculation of the power system, the node voltage is expressed in Cartesian coordinates as: [0003] [0004] Each node in the power system has four operating variables: active power P, reactive power Q, voltage amplitude V and voltage phase angle θ. In general power system power flow calculation, two operating parameters are often given as known conditions for each node, while the other two are used as required quantities. According to the way given by the original data, the nodes in the power system are divided into the following three types: [0005] 1. PQ node [0006] For such nodes, P and Q are given, and V and θ are to be requested. [0007] 2. PV no...

Claims

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Application Information

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IPC IPC(8): H02J3/00
Inventor 姚玉斌
Owner DALIAN MARITIME UNIVERSITY
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