Variable-speed double-fed wind power station clustering equating method based on mechanical and electrical dynamic characteristics

Abstract

The invention discloses a variable-speed double-fed wind power station clustering equating method based on mechanical and electrical dynamic characteristics. Firstly, a system containing a wind power station is quickly initialized to determine an initial operating point. According to the types of selected double-fed wind generators and by means of offline calculation, the wind speed upper limit and the wind speed lower limit of the remarkable change of transient-state electrodynamic potential dynamic characteristics of the wind generators are determined, and the wind generators are divided into three clusters. Secondly, the double-fed wind generators in the same cluster are respectively connected to an equivalent double-fed wind generator node through a complex ratio transformer, and interbuses, load buses, transient-state internal potential buses increased during equivalent and phase shift transformers in the wind power station are eliminated to obtain an equivalent network. Thirdly, according to the connection relation of an equivalent circuit of the wind generator and the principle of unchanged output mechanical power, equivalent wind generator parameters and equivalent wind speed are deduced. The variable-speed double-fed wind power station clustering equating method comprehensively considers electromechanical dynamic similarity degree of the double-fed wind generators and is particularly suitable for accurate equivalent operation of the wind power station with complex connection and large wind speed difference.

Description

technical field [0001] The invention relates to a grouping and equivalent method for variable-speed doubly-fed wind farms based on mechanical and electrical dynamic characteristics, and belongs to the technical field of wind farm dynamic equivalents. Background technique [0002] The variable-speed constant-frequency doubly-fed induction generator (Doubly-fed Induction Generator, DFIG) has the advantages of high wind energy utilization rate, low converter power, decoupling control of active power and reactive power, etc., and is widely used. In order to accurately analyze the impact of large-scale DFIG wind farm grid connection on power system characteristics, it is necessary to establish a credible DFIG wind farm model. The single-unit capacity of DFIG wind turbines is relatively small, and the total installed capacity of large-scale wind power bases can reach thousands of units. If each unit is modeled in detail, the existing power system "curse of dimension" problem will...

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Problems solved by technology

[0004] The technical problem solved by the present invention is that the existing wind farm equivalent method lacks the grouping quantization standard and the wind turbine aggregation and wind farm network simplification methods are too rough to cause the equivalent accuracy to be low. It provides a machine based on DFIG The method of grouping based on the similarity degree of electrical dynamic characteristics and the strict displacement, aggregation and network simplification of wind turbines

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