A series voltage compensator for three-phase unbalanced sources is presented and analyzed. The system, based on a three-phase voltage source inverter connected in series to the supply through a three-phase delta-wye power transformer, proves to be feasible and performs as expected. A 1.3 kVA prototype was built and tested with 10.75% of unbalance and 9.01% of magnitude error ( mod MF mod =0.909). The results showed a very good correlation with the expected performance, producing a balanced line-to-line load voltage with a low harmonic content (average THD=20%), without filter. The compensator required only 168.8 VA, which shows one of the main advantages of the compensator scheme proposed.
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机译：提出并分析了一种用于三相不平衡电源的串联电压补偿器。该系统基于一个三相电压源逆变器，该逆变器通过一个三相三角形-三角形电力变压器与电源串联，被证明是可行的，并且可以按预期运行。构建了一个1.3 kVA的原型，并进行了10.75％的不平衡和9.01％的幅度误差测试（mod MF mod = 0.909）。结果显示出与预期性能的很好的相关性，产生了具有低谐波含量（平均THD = 20％）且没有滤波器的平衡的线间负载电压。补偿器只需要168.8 VA，这表明了所提出的补偿器方案的主要优点之一。
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