Identification method of DFIG wind farm equivalent parameter

Abstract

The invention discloses an identification method of DFIG wind farm equivalent parameter. The identification method includes the following steps: firstly, a volume weighting method is used to equate parameters of wind speed, wind turbines and electric generators in a wind farm roughly; Then whether a DFIG wind farm equivalent parameter is a dominant parameter or a non-dominant parameter is determined by using a sensitivity analysis method; Then the volume weighting method continues to be used to obtain an equivalent result of the non-dominant parameters, the equivalent result is taken as an initial value and the dominant parameters are optimized and identified by using genetic algorithm, and an optimized result of the equivalent parameters is acquired. The identification method is a final identification scheme of parameters equivalence, which can obtain a more accurate equivalent model of DFIG wind farm and further improve the credibility of simulation results.

Description

technical field [0001] The invention relates to the technical field of wind farm research, in particular to a method for identifying equivalent parameters of a DFIG wind farm. Background technique [0002] With the continuous increase of wind power penetration, in order to more accurately evaluate the specific impact of wind power grid connection, the study of accurate equivalent modeling of wind farms is becoming more and more important. In the prior art, there are many studies on the static equivalent value under non-fault conditions and the electromagnetic transient equivalent value during the fault period of the wind farm, but there are few studies on the electromechanical transient equivalent value under non-severe faults. Under non-serious faults, the wind farm has obvious voltage drop, which affects the stability of the system. Therefore, it is of great significance to study the exact equivalent value of wind power plants under non-serious faults. [0003] In order t...

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Problems solved by technology

[0003] In order to deeply study the impact of wind power penetration on the entire power grid, it is necessary to conduct an equivalent analysis of the operating characteristics of large-scale doubly-fed induction wind farms when they are connected to the system. New DFIG wind turbines usually introduce a Crowbar circuit to protect the unit from damage during faults. , but the existing technology lacks the accurate equivalent of the new DFIG electromechanical transient model, and there are fewer studies on the equivalent value of wind farms under non-serious faults, resulting in low reliability of simulation results

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