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首页> 外文期刊>Power Electronics, IET >Medium voltage 12-pulse converter: ac side compensation using a shunt active power filter in a novel front end transformer configuration
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Medium voltage 12-pulse converter: ac side compensation using a shunt active power filter in a novel front end transformer configuration

机译：中压12脉冲转换器：在新型前端变压器配置中使用并联有功功率滤波器进行交流侧补偿

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摘要

In this study, a shunt active power filter (APF), with predictive current control is coupled to the 12-pulse converter in two different configurations where the same performance is achieved. The proposed configuration (the second configuration) utilises a three-winding transformer (star/tapped-star/delta) with an APF connected to the secondary taps. This transformer configuration reduces the filter side voltage avoiding the need of a high bandwidth step-down transformer. This reduces the voltage rating of the APF switches, consequently, increases the switching frequency limit. Moreover, the APF-injected compensation current is minimised, as it utilises the natural mitigation of the current harmonic components generated by each 6-pulse converter, because of the phase shift property of the front-end transformer. The APF is controlled to compensate system reactive power, distortion and the oscillating power at the converter ac side. The compensated sinusoidal input current has acceptable total harmonic distortion (THD) and near unity power factor. The converter operates under a specific power locus that compromises between a symmetrical firing power locus and asymmetrical firing loci. This locus provides minimum input current THD when the reactive power is less than 0.5 pu. The simulation results for compensating a 3.3-kV, medium voltage, MV, 12-pulse converter system are experimentally verified using a scaled prototype 12-pulse converter with a shunt APF.
机译：在这项研究中，具有预测电流控制功能的并联有源功率滤波器（APF）以两种不同的配置耦合到12脉冲转换器，从而实现了相同的性能。提出的配置（第二种配置）利用了一个三绕组变压器（星形/抽头星形/三角形），其APF连接到次级抽头。这种变压器配置可降低滤波器侧电压，从而无需使用高带宽降压变压器。这会降低APF开关的额定电压，因此会增加开关频率极限。此外，由于前端变压器的相移特性，APF注入的补偿电流被最小化，因为它利用了由每个6脉冲转换器产生的电流谐波分量的自然缓解。对APF进行控制，以补偿系统无功功率，失真和转换器交流侧的振荡功率。补偿后的正弦输入电流具有可接受的总谐波失真（THD）和接近单位功率因数。转换器在特定的功率轨迹下运行，该功率轨迹在对称点火功率轨迹和非对称点火轨迹之间折衷。当无功功率小于0.5 pu时，此轨迹可提供最小输入电流THD。使用带有并联APF的比例缩放原型12脉冲转换器，通过实验验证了补偿3.3 kV，中压，MV，12脉冲转换器系统的仿真结果。

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