ABSTRACT Due to the power-grid low-order harmonic voltage and the nonlinearity of power electronic devices, the grid-connected converter of wind power generation system produces grid-connected harmonic current. In order to improve the output power quality of full-power grid-connected converter of wind power generation system, based on the detailed analysis of the harmonic mathematical model of grid-side converter, a cross-coupling control strategy for suppressing the low-order harmonic current components is proposed in this paper. In this control strategy, the DC component of each grid-connected harmonic current is detected in the multi-synchronous rotating coordinate system, and the current cross-coupling control method is adopted to realize the accurate control of each harmonic current. The harmonic current cross-coupling controller is analyzed and designed in detail. The proposed control strategy takes into account the cross-coupling effect of each harmonic current, which can effectively reduce the interaction between each harmonic current and the fundamental current, and improve the stability of the system. Simulation and experimental test verify the correctness and feasibility of the proposed control strategy.

随着通信技术应用范围的扩大，各种微波通信系统的发展非常迅速。在同一系统中，频率拥挤与多信道实时双向通信要求收、发信道必须同时使用同一副天线，这就必须在设备的前端设计双通道的波道合成和分离器件即微波双工器。双工器主要由收发通带的带通滤波器和分支接头两部分组成。分支接头可以是无方向性的T型接头，或有方向性的铁氧体环形器。

有利于帮助初学滤波器设计人员，学习滤波器的设计，也可以帮助提升初学者的理论。

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