PDF(3235 KB)
Voltage Equalizing Control for Series DC Wind Farm with Hierarchical Voltage Equalizer
ZHOU Zhonghan, FAN Yanfang, HOU Junjie, WANG Yibo, WANG Yaqiang
Electric Power Construction ›› 2025, Vol. 46 ›› Issue (11) : 130-144.
PDF(3235 KB)
PDF(3235 KB)
Voltage Equalizing Control for Series DC Wind Farm with Hierarchical Voltage Equalizer
[Objective] A series DC wind farm realizes the DC collection and transmission by connecting the DCWTs in series. This has broad developmental prospects. However， owing to the coupling characteristics of voltage and power， a series DC wind farm faces severe challenges in control and protection. Therefore， this study proposes a voltage equalizing control scheme based on a hierarchical DC voltage equalizer. [Methods] First， a hierarchical DC voltage equalizer circuit is proposed， its working principle is analyzed， and the advantages of the hierarchical voltage equalizing topology are verified based on the graph theory. Second， a matching coordinated control strategy is designed based on the principle of voltage equalization. Finally， to simulate the steady condition under unbalanced output power and fault conditions under a DCWT fault， a simulation model of series DC wind farms with a hierarchical DC voltage equalizer is established in MATLAB/Simulink. [Results] The simulation results indicated that the proposed scheme achieved decoupling control between the series DCWTs and was more advanced in equalizing the speed and amplitude of voltage fluctuations. [Conclusions] The proposed scheme significantly improved the voltage equalizing performance between the series DCWTs， enabling each DCWT to independently operate in the MPPT mode， and it avoided overvoltage and wind curtailment under power differences， providing a solution for the stable operation and power optimization of series-connected all-DC wind farms.
series all-DC wind farm / series coupling / hierarchical structure / voltage equalization control / graph theory / voltage equalizing speed
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