Homotopy-based distributed power supply and non-linear load containing short circuit current calculating method

A distributed power supply and non-linear load technology, applied in computing, electrical digital data processing, special data processing applications, etc., can solve the problems of lack of load model research, iterative non-convergence, etc., achieve precise setting values, improve solution accuracy, Wide range of effects

Active Publication Date: 2016-11-02
RES INST OF ECONOMICS & TECH STATE GRID SHANDONG ELECTRIC POWER +1
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Problems solved by technology

[0009] Although the superposition method and the compensation current method reduce the amount of calculation to a certain extent, the research on the load model is relatively lacking. The load ha

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  • Homotopy-based distributed power supply and non-linear load containing short circuit current calculating method

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Embodiment Construction

[0039] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0040] 1 Establishment of system model

[0041] 1.1 Steady-state model of distributed power generation

[0042] Distributed power includes synchronous generators, asynchronous generators and distributed power connected to the grid through inverters. They can be regarded as PV nodes, PQ nodes or PI nodes. In this patent, when the distributed power supply is used as a PV node to calculate the short-circuit current and does not converge, it will be converted into a PQ node.

[0043] 1.2 Load model

[0044] Generally speaking, load models include constant power model, constant current model, constant impedance model and the combined load model (ZIP) of the three. Three phase loads can be made balanced or unbalanced star grounded or delta ungrounded and single phase or two box grounded. The combined load model can be expressed by the following two formul...

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Abstract

The invention discloses a homotopy-based distributed power supply and non-linear load containing short circuit current calculating method comprising the following steps: taking the distributed power supply as a node, and building a power distribution network system model according to connecting modes and parameters of each electrical part in the power distribution network; using an iteration type compensation current method to resolve the short circuit current of a power distribution network load model; determining whether the resolved short circuit current has converged or not, entering the next step if not, and storing the result and stop computing if the short circuit current has converged; converting all constant power loads into a constant impedance load model, using the iteration type compensation current method to compute the short circuit current, and computing short circuit voltage values of each node in the power distribution network system; building a homotopy equation, using calculated short circuit voltage values and current values to build an admittance matrix, and using a continuous method to resolve and update the admittance matrix, thus obtaining the convergence short circuit current solution. The homotopy-based distributed power supply and non-linear load containing short circuit current calculating method can simultaneously improve short circuit calculating performance in the aspects of convergence and resolving precision.

Description

technical field [0001] The invention relates to a homotopy-based short-circuit current calculation method including distributed power supply and nonlinear load. Background technique [0002] In recent years, with the rapid development of green renewable energy such as wind energy and solar energy, the distributed power generation technology based on this has also been vigorously developed. The access of distributed power generation has changed the topology of the distribution network, allowing electric energy to flow in both directions, which brings more challenges to the operation and maintenance of the distribution network. [0003] Specific analysis, its impact has two sides. On the one hand, the distributed power supply compensates the electric energy locally in the load center to reduce the loss caused by the flow of electric energy in the line, and at the same time improve the quality of the power supply voltage and improve the reliability of the power supply. On the ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/367
Inventor 吴奎华吴健梁荣冯亮杨波孙伟郑志杰杨慎全张晓磊刘晓明王轶群李昭李勃杜鹏
Owner RES INST OF ECONOMICS & TECH STATE GRID SHANDONG ELECTRIC POWER
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