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Exploring the LCL Characteristics in GaN-Based Single-L Quasi-Z-Source Grid-Tied Inverters

机译:探索基于GaN的单L准Z源并网逆变器的LCL特性

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摘要

As more widebandgap (WBG) devices are becoming commercially available, it is beneficial to use WBG device to increase the switching frequency in order to reduce the passive components. For quasi-Z-Source (qZS) grid-tied inverters, the reduction of passive components raises stability concerns as the coupling effect between the dc side and ac side of qZS inverter will increase. In this paper, the coupling effect between qZS impedance network and the output filter is analyzed by modeling both dc and ac sides. Analysis reveals the resonant characteristic of the qZS inverter. Controller parameter boundaries are derived, and a design method to improve stability is then proposed. Case studies for a 2.5-kW 10-kHz Si-based qZS inverter and a 1-kW 100-kHz GaN-based qZS inverter are presented. Circuit simulations and experimental verifications results are provided to assess analysis and the control design.
机译:随着越来越多的宽带隙(WBG)设备在市场上可以买到,使用WBG设备增加开关频率以减少无源组件是有益的。对于准Z源(qZS)并网逆变器,由于qZS逆变器的直流侧和交流侧之间的耦合效应将增加,因此减少无源元件会增加稳定性问题。本文通过模拟直流侧和交流侧来分析qZS阻抗网络与输出滤波器之间的耦合效应。分析揭示了qZS逆变器的谐振特性。推导了控制器的参数边界,并提出了一种提高稳定性的设计方法。给出了一个2.5kW 10kHz硅基qZS逆变器和1kW 100kHz GaN基qZS逆变器的案例研究。提供电路仿真和实验验证结果,以评估分析和控制设计。

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