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首页> 外文期刊>Power Electronics, IET >Three-level hysteresis current control strategy for three-phase four-switch shunt active filters
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Three-level hysteresis current control strategy for three-phase four-switch shunt active filters

机译：三相四开关并联有源滤波器的三级磁滞电流控制策略

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摘要

In this study, a three-level hysteresis current-control (HCC) strategy is proposed for three-phase four-switch shunt active power filters. The four-switch topology which utilises four switching devices together with two series connected capacitors is able to reduce the cost, switching losses and improve the reliability of system. In this topology, when the current control of phases A and B is achieved successfully, the current control of phase C which is connected to the midpoint of the series connected capacitors is achieved automatically. The current control is achieved by using a three-level HCC strategy. An important consequence of using this control strategy is that it enables access to the zero level of the input voltage of active filter so that a switching device is only switched when the current error is negative, while it remains off when the current error is positive. Furthermore, the imbalance in the capacitor voltages is eliminated by adding a feedback term (the difference in the capacitor voltages multiplied by a suitable gain) to the current control. The proposed control strategy offers a reduced switching frequency, losses and cost. The steady-state and dynamic performance of the proposed control strategy is verified through simulations and experimental studies.
机译：在这项研究中，针对三相四开关并联有源功率滤波器，提出了一种三级磁滞电流控制（HCC）策略。利用四个开关器件和两个串联电容器的四开关拓扑结构可以降低成本，降低开关损耗并提高系统的可靠性。在这种拓扑中，当成功实现A相和B相的电流控制时，将自动实现连接到串联电容器中点的C相的电流控制。通过使用三级HCC策略来实现当前控制。使用该控制策略的重要结果是，它可以访问有源滤波器输入电压的零电平，从而仅当电流误差为负时才切换开关设备，而当电流误差为正时它保持关断状态。此外，通过在电流控制中增加一个反馈项（电容器电压之差乘以合适的增益）可以消除电容器电压的不平衡。所提出的控制策略提供了降低的开关频率，损耗和成本。通过仿真和实验研究验证了所提出控制策略的稳态和动态性能。

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