Subsynchronous Oscillation Equivalence of Doubly-fed Wind Farms Based on Index Dimension Reduction and Collector System Identification

The use of line series capacitance compensation in doubly-fed wind farms will cause subsynchronous oscillations in the system. The detailed modeling of each wind fan will cause the problem of dimensionality disaster, and it is necessary to establish an equivalent model suitable for the analysis of subsynchronous oscillation characteristics. This paper proposed a subsynchronous oscillation equivalent method for doubly-fed wind farms based on index dimensionality reduction and power collection system identification. First, the dominant variable of the subsynchronous oscillation mode of the series-compensated grid-connected system of the doubly-fed wind farm was used as the initial variable index, and a factor analysis model was established for grouping. Secondly, the initial equivalent parameters of the complex collection network were obtained by using the equal power loss method, and the equivalent parameters were identified by the adaptive particle swarm optimization algorithm. Finally, by establishing the detailed wind farm model and equivalent model of 20 and 42 doubly-fed wind fans, the effectiveness of the equivalent method can be verified. ©2022 Chin.Soc.for Elec.Eng.