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中文摘要：
针对高性能三相异步电机变频调速系统的总体需求．提出了一种背靠背变换器主电路参数的设计方法。以电网电流总谐波畸变率（THD）作为电流稳态性能的衡量指标。推导了2种不同的计算电流谐波的方法。然后详细分析了主电路中的网侧滤波电感和直流母线电容与系统控制性能之间的关系．据此提出了这2个储能元件的设计原则。同时结合背靠背变换器功率可双向流动和直流母线电压可控的特点．对系统的电路参数进行合理的设计，在此基础上研制出一套用于驱动55kW异步电机的实验装置。仿真和实验结果验证了所提主电路参数设计方法的可行性．
英文摘要：
The main circuit parameters of back-to-back converter are designed according to the overall requirement of frequency-variable speed regulation system for high-performance three-phase induction motor. With the THD of grid current as the judgment index of current steady-state performance,two methods of current harmonics calculation are derived. The relationship between the grid-side filter inductor/DC-link capacitor in main circuit and the system performance is analyzed in detail and the design principles are proposed for these two energy-storage components. The main circuit parameters are properly designed based on two facts：the power of back-to-back converter flows in both directions and the DC-link voltage is controlled. A prototype of back-to-back converter is developed for a 55kW indiaction motor and the feasibility of the proposed design method is verified by its simulative and experimental results.
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