基于多比例谐振的混合APF谐波补偿研究

针对变频器在船舶上的大量使用而导致谐波污染问题,提出一种基于多比例谐振的混合有源滤波器谐波补偿策略。混合有源滤波器由LC无源滤波器和有源滤波器构成,并结合多比例谐振组成谐波补偿控制策略。该控制策略由电网谐波检测、谐波补偿和谐波电流跟踪组成。其中谐波补偿采用检测电网电流的方式,保证治理谐波的同时,抑制LC滤波器可能发生的谐振；谐波跟踪采用多比例谐振控制器,利用其在不同特定频率高阻抗的特点,准确跟踪不规则的谐波电流,提高控制系统的精度。最后,仿真结果验证了所提控制策略可有效抑制船舶电网谐波,提高设备用电的安全性。

Harmonic Compensation Research of Hybrid APF Based onQuasi Proportional Resonance

Aiming at solving the harmonic pollution of ship grid due to the usage of frequency converters, a novel hybrid active power filter (APF) compensation strategy is proposed. The hybrid APF is composed of LC passive filter and active power filter which employs multi proportional resonant (MPR) controller to compensate the harmonic in ship grid. The controller consists of harmonic detection, compensation and harmonic current following-up. Meanwhile, the methods of grid current harmonic detection not only guarantee the elimination of THD, but also suppress the resonant of LC filter. In addition, because of the high amplitude of MPR in different frequency, the controller can improve system response speed and dynamic performance when connected to non-linear load. Finally, the simulation and experiment results show the proposed control strategy has a significant advantage in reduction of ship gird THD and improve the safety of power system.