Load flow calculation method for AC/DC parallel serial system based on improved LM algorithm

A technology of AC-DC hybrid and system power flow, which is applied in the direction of AC network with the same frequency from different sources, calculation, design optimization/simulation, etc., and can solve the problem of insufficient convergence

Inactive Publication Date: 2016-12-14
SHANGHAI MUNICIPAL ELECTRIC POWER CO +2
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  • Application Information

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Problems solved by technology

However, the convergence is not good enough under the ill-conditioned condition of the heavy load of the AC-DC hybrid system

Method used

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  • Load flow calculation method for AC/DC parallel serial system based on improved LM algorithm
  • Load flow calculation method for AC/DC parallel serial system based on improved LM algorithm
  • Load flow calculation method for AC/DC parallel serial system based on improved LM algorithm

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Embodiment

[0039] Such as figure 1 As shown, a power flow calculation method of AC / DC hybrid system based on the improved LM algorithm, the method includes the following steps:

[0040] Step 1: Enter system data, including network topology description, line parameters, generator output, load size, reactive power compensation, transformer transformation ratio and other data required for conventional power flow calculations. The topological structure of the system is analyzed, and the node power equations, converter basic equations, DC network equations, and control equations are constructed, and then the system power flow calculation equations F(x)=0 are obtained.

[0041] The node power equations are:

[0042] For exchange nodes:

[0043] ΔP i = P G i ...

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Abstract

The invention relates to a load flow calculation method for an AC/DC parallel serial system based on an improved LM algorithm. The method comprises the following steps: (1) acquiring a load flow calculation equation set F(X) of the AC/DC parallel serial system, setting an initial iteration point and an initial self-adaption factor, wherein iteration K=1; (2) acquiring a jacobian matrix of the iteration at k time according to F(x); (3) gaining a damping factor of the iteration at k time according to the self-adaption factor of the iteration at k time, thereby acquiring an iterative step length and an approximate iterative step length of the iteration at k time; (4) calculating a choice factor of the iteration at k time and adjusting the iteration point and the self-adaption factor according to the choice factor, thereby acquiring the iteration point at k+1 time and the self-adaption factor for the iteration at k+1 time; and (5) judging if an iteration ending condition is met, if so, acquiring the load flow calculation data of the AC/DC parallel serial system, otherwise, assigning k=k+1 and returning to the step (2). Compared with the prior art, the method provided by the invention has excellent convergence character.

Description

technical field [0001] The invention relates to a power flow calculation method for an AC / DC hybrid system, in particular to a power flow calculation method for an AC / DC hybrid system based on an improved LM algorithm. Background technique [0002] With the application of high-voltage direct current (HVDC) around the world, the modern power system has become an AC-DC hybrid system: a power system in which the AC system and the DC system are interconnected. With the construction of ultra-high voltage (UHV) transmission network, more and more attention has been paid to the stability and safe operation of AC-DC hybrid system. Power system power flow calculation is a basic and effective tool for stability and safety analysis. In order to make the power system operate safely, stably and efficiently, it is necessary to obtain a reasonable AC-DC hybrid power flow solution, so a better calculation method is needed. [0003] At present, there are two types of power flow calculation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/06G06F17/50
CPCG06F30/20H02J3/06Y02E60/00
Inventor 李禹鹏冯楠严正杨增辉崔勇冯煜尧马骏宇曹佳徐潇源
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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