Double-fed machine set wind power station equivalent modeling system and method based on rotation speed grouping

Abstract

The invention discloses a double-fed machine set wind power station equivalent modeling system and method based on rotation speed grouping, wherein the system comprises a fan running information extracting unit, a machine set grouping unit and an equivalent machine parameter calculating unit which are sequentially connected. The method comprises the following steps that firstly the fan running information extracting unit extracts all rotation and mechanical power information of fault initial time of all to-be-equivalent fans for subsequent calculation; then the machine set grouping unit divides machine sets with similar rotation speed of fault initial time of the machine sets into a same machine group; and finally, the equivalent machine parameter calculating unit calculates each group of equivalence to be parameters of one double-fed machine set by adopting a volume weighting based parameter polymerization method, and thus a multi-machine electromagnetic transient state equivalent model which is subjected to equivalence of a wind power station. The system and the method provided by the invention provide a foundation condition for the influence research on the conventional relay protection for large-scale wind energy electromagnetic transient state value simulation calculation and switched power systems.

Description

technical field [0001] The invention relates to the technical field of equivalent modeling of wind farms, in particular to a wind farm equivalent modeling system and method for doubly-fed units based on speed grouping. Background technique [0002] With the rapid development of large-scale, high-concentration, and long-distance wind farm grid-connected forms, the electromagnetic transient simulation calculation of large-scale wind farms has encountered great difficulties, and the development of wind farm electromagnetic transient equivalent models has become a It is urgent to calculate the system fault numerical value and analyze the impact of wind power access to the power system on the existing protection devices. [0003] There are three main types of modern synchronous generator equivalent theory systems: Coherency-Based Equivalent, Modal Equivalent, and Estimation Equivalent. [0004] The coherence equivalent method is mainly used to analyze the transient stability of ...

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Problems solved by technology

[0007] People's research on the equivalent model of variable speed and constant frequency wind farm still stays in the steady state model used for power flow calculation and the electromechanical transient model used for system transient stability analysis, and the above models are still not competent for the electromagnetic transient state of wind turbines. In order to meet the needs of process research, it is necessary to comprehensively investigate the fault characteristics of variable-speed constant-frequency fans and wind farms in order to propose an effective electromagnetic transient equivalent scheme and calculate the output voltage and current waveforms during the transient process.

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