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首页> 外文期刊>Electric power systems research >An optimal operation strategy for an active power filter using cascaded H-bridges in delta-connection
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An optimal operation strategy for an active power filter using cascaded H-bridges in delta-connection

机译：三角形连接中使用级联H桥的有源滤波器的最佳工作策略

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摘要

An optimal strategy is presented to determine the combined control reference for the terminal and circulating currents of a shunt active power filter (APF) based on the delta-connected cascaded H-bridge (CHB) topology, hereby minimizing the operational power under ideal and non-ideal grid voltages, where the ideal grid voltages contain only the positive-sequence fundamental frequency component and the non-ideal grid voltages contain unbalance and/or harmonic components. The optimization is carried out to simultaneously satisfy the desired grid current distortion limits, the source current imbalance characteristics and the power factor as well as power balance requirement. By properly coordinating terminal current control and circulating current injection of the delta-connected CHB and taking possibly unbalanced and/or distorted grids the total power rating of the APF can be kept at minimum, leading to an economical operation. The optimization problem is formulated using a convex quadratic objective function and non-convex quadratic constraints and solved by an iterative procedure. The simulation results show that the proposed strategy is applicable and effective for reactive power and harmonic compensation with an optimal rating of the APF under ideal and non-ideal grid conditions.
机译：提出了一种最佳策略，用于确定基于三角形连接的串联H桥（CHB）拓扑的并联有源功率滤波器（APF）的终端电流和循环电流的组合控制参考，从而将理想和非理想情况下的工作功率降至最低-理想电网电压，其中理想电网电压仅包含正序基频分量，而非理想电网电压包含不平衡和/或谐波分量。进行优化以同时满足所需的电网电流畸变极限，源电流不平衡特性和功率因数以及功率平衡要求。通过适当地协调三角形连接的CHB的终端电流控制和循环电流注入，并采取可能不平衡和/或变形的电网，可以将APF的总额定功率保持在最低水平，从而实现了经济的运行。使用凸二次目标函数和非凸二次约束来制定优化问题，并通过迭代过程进行求解。仿真结果表明，在理想和非理想电网条件下，所提出的策略都适用于无功功率和谐波补偿，且APF具有最佳额定值。

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