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Analysis and Experimental Characterization of a Large-Bandwidth Triple-Loop Controller for Grid-Tied Inverters

机译:并网逆变器大带宽三环控制器的分析与实验表征

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This paper analyzes a large-bandwidth, triple-loop controller designed for single-phase, grid-tied, and voltage–source inverters withLCLoutput filter. The inner control loops regulate the inverter output current and the filter capacitor voltage, respectively, while the third, outer one regulates the current injected into the grid. The inner loops are given deadbeat type regulators, whose minimum response delay allows the third loop to achieve a relatively large regulation bandwidth. This organization provides several benefits, including a regulated local ac voltage, a large-bandwidth control of the power flowing to the grid, and a good robustness against different types of commonly encountered grid perturbations. In particular, grid voltage harmonic pollution, amplitude, and frequency fluctuations or connection impedance parameter variations can be tolerated without incurring into instability or unacceptable performance degradation. Besides, the proposed controller is inherently able to guarantee seamless transitions between grid-tied and islanded operation, showing good potential for application to nano- and microgrid utility interface converters.
机译:本文使用 n LCL n输出过滤器。内部控制回路分别调节逆变器输出电流和滤波电容器电压,而第三个外部回路调节注入电网的电流。内部环路具有无差拍类型的调节器,其最小响应延迟使第三环路实现相对较大的调节带宽。该组织提供了许多好处,包括调节本地交流电压,对流向电网的功率进行大带宽控制以及对不同类型的常见电网扰动具有良好的鲁棒性。特别是,可以容忍电网电压谐波污染,幅度和频率波动或连接阻抗参数变化,而不会引起不稳定或不可接受的性能下降。此外,所提出的控制器具有固有的能力,可以确保并网运行和孤岛运行之间的无缝过渡,显示出在纳米和微电网公用接口转换器中的应用潜力。

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