一种基于电压过零点的差模谐波环流抑制方法研究

A Synchronous Harmonic Circulation Suppression Strategy for PWM Carrier Based on Grid Voltage Zero Crossing

储能变流器广泛应用于新能源储能电站系统中,多台变流器交流侧并联连接时由于差模回路,因此产生高频谐波环流问题。为了分析高频谐波环流的具体形态及对产品的影响,首先建立多台并联变流器谐波环流等效模型,对多机并联谐波环流特性进行分析。进而提出一种基于电压过零点的差模谐波环流抑制方法,最后通过仿真和实验验证了相关抑制策略。

Energy storage converters are widely used in new energy storage power station systems.When multiple converters are connected in parallel on the AC side,the problem of high-frequency harmonic circulation occurs due to the differential mode circuit.In order to analyze the specific shape of high-frequency harmonic circulation and the influence of products,firstly,the equivalent model of harmonic circulation of multiple parallel converters is established,and the characteristics of multi-machine parallel harmonic circulation are analyzed.Furthermore,a differential mode harmonic circulation suppression method based on voltage zero crossing is proposed.Finally,the relevant suppression strategy is verified by simulation and experiments.