卷烟厂配电有源电力滤波器故障容错控制
Fault tolerant control of active power filter in cigarette factory power distribution
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摘要: 为解决卷烟厂配电有源电力滤波器(Active Power Filter, APF)桥臂故障引起的谐波抑制失效和车间配电系统谐波骤增问题,提出一种模型预测容错控制方法。该方法通过分析APF容错变换器的工作原理,揭示故障容错后电压矢量变化关系,进而建立谐波补偿电流预测模型;设计一种基于二阶广义积分正交发生器(SOGI)的谐波快速检测方法,将SOGI输出的谐波补偿电流作为模型预测控制的参考指令;根据电流预测模型和参考指令,在故障容错APF的菱形电压矢量集内,优选满足代价函数最小的开关状态,进行模型预测容错控制,实现谐波补偿。半实物实验结果表明:发生桥臂故障后,该容错控制方法仍能连续运行,线路总谐波失真由9.91%降至4.87%,卷烟厂配电APF设备的可靠性和故障容错能力得到提高。Abstract: In order to solve the harmonic suppression failure and harmonic surge in workshop distribution system caused by the fault of Active Power Filter (APF) bridge arm, a model predictive fault-tolerant control strategy was proposed. By analyzing the working principle of APF fault-tolerant transformation topology, the relationship of voltage vector transformation after fault-tolerant was revealed, and the prediction model of harmonic compensation current was established. A fast harmonic detection method based on the second-order generalized integral orthogonal generator (SOGI) was designed, and the harmonic compensation current output by SOGI was used as the reference instruction of the predictive control. According to the current predictive model and the reference instruction, in the rhombus voltage vector set of the fault tolerant APF, the switching state satisfying the minimum cost function was selected to carry out model predictive control and harmonic compensation. Experiments results verifed that, in the condition of the bridge arm fault, the proposed control strategy could work continuously and suppress harmonic current. The total harmonic distortion(THD) of the power distribution line is reduced from 9.91% to 4.87%, which verified that the proposed method can improve the reliability and fault tolerant capability of APF equipment in the cigarette factory.
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