Short-circuit current calculation method for double-fed wind power generation system by considering different slips

A double-fed wind power generation and short-circuit current technology, which is applied in wind power generation, circuit devices, AC network circuits, etc., can solve problems such as restricting power system planning and design research, and the short-circuit calculation model cannot accurately calculate the short-circuit current of the double-fed wind power generation system. , to achieve the effect of improving the accuracy

CN107317327AActive Publication Date: 2017-11-03POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-11-03

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Abstract

The invention discloses a short-circuit current calculation method for a double-fed wind power generation system by considering different slips. Double-fed wind power generators are divided into two types based on slips: a type with large slip and a type with small slip. The double-fed wind power generator in the type with large slip takes positive sequence equivalent impedance as a positive sequence equivalent model, and the double-fed wind power generator in the type with small slip adopts equivalent potential to be serially connected with positive sequence equivalent impedance to be taken as a positive sequence equivalent model; next, negative sequence equivalent impedance is taken as a negative sequence equivalent model of the double-fed wind power generator; and finally, by performing joint solving on the positive sequence equivalent impedance, the negative sequence equivalent impedance of the double-fed wind power generator and an equivalent circuit of an electric power system, the short-circuit current of the double-fed wind power generation system is worked out. By considering influence of different slips to short-circuit calculation sequence component models of the double-fed wind power generators, the short-circuit calculation models for the double-fed wind power generators of different slips are established, so that short-circuit current calculation accuracy of the double-fed wind power generation system is improved.
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Description

technical field

[0001] The invention relates to the field of short-circuit calculation of a power system after wind power is connected, and more particularly relates to a calculation method for short-circuit current of a doubly-fed wind power generation system considering different slips. Background technique

[0002] Wind power is the main force of renewable energy power generation and is considered to be an effective alternative to traditional fossil energy power generation. In some regional power grids, its installed capacity has exceeded 10% of the total system power capacity. Doubly-fed wind turbines are the main equipment for wind power generation, accounting for more than 50% of wind power grid-connected capacity. The stator of the asynchronous motor of the double-fed wind turbine is directly connected to the grid, and the rotor winding is connected to the grid through a back-to-back converter. Under normal operating conditions, the rotor converter feeds the stator ...

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Embodiment Construction

[0028] The accompanying drawings are for illustrative purposes only and cannot be construed as limiting the patent;

[0029] In order to better illustrate this embodiment, some parts in the drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product;

[0030] For those skilled in the art, it is understandable that some well-known structures and descriptions thereof may be omitted in the drawings.

[0031] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0032] A calculation method for short-circuit current of doubly-fed wind power generation systems with different slips, which divides doubly-fed wind power generators into two categories according to the size of the slip, and doubly-fed wind power generators greater than the preset slip are defined as slip categories For doubly-fed wind turbines, the doubly-fed wind turbines with less than the...