Single-phase current source converter with new modulation approach and power decoupling
Single-phase current source converter with new modulation approach and power decoupling
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DOI：
10.1109/apec.2014.6803610
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发表时间：
2014-03
期刊：
影响因子：
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通讯作者：
M. Vitorino;L. V. Hartmann;D. Fernandes;Emanoel L. Silva;M. Corrêa
中科院分区：
文献类型：
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作者：
M. Vitorino;L. V. Hartmann;D. Fernandes;Emanoel L. Silva;M. Corrêa
在这项工作中，它提出了一个电流源转换器（CSC）的拓扑结构，有助于减轻双线频率的电源涟漪（低频）的影响。单相系统中的低频功率涟漪通过直流母线变换器传播。这种低频涟漪减小允许通过减小DC电感器的体积来增加功率转换器密度，而不会在DC总线处缺乏刚度。低频缓解是通过使用不同的单相CSC拓扑结构实现的，该拓扑结构在每个支路上使用三个串联连接的开关。因此，它允许对共享相同DC总线和支路的中间开关的两个合并CSC进行独立控制。该解决方案足以将光伏板连接到电网等应用。通过假设网格建模来评估这样的解决方案是有用的，并且可能需要强大的仿真工具，例如实时仿真器。为了符合功率处理限制，推导出低频模型。比较两种模型（高频和低频）的性能，以确保低频模型的可用性。提出了控制策略和调制方法。仿真结果验证了理论方法的有效性，并提供了实时仿真结果。
In this work it is presented a Current Source Converter (CSC) topology that helps to mitigate double line frequency power ripple (low frequency) effect. Low frequency power ripple presented in single-phase systems propagates through DC-bus converter. This low frequency ripple reduction allows to increase the power converter density by reducing the volume of the DC inductor, without lack of stiffness at the DC-bus. The low frequency mitigation is achieved by using a different single-phase CSC topology that uses three series-connected switches per leg. Thus, it allows independent control for two merged CSCs which share the same DC-bus and the middle switches of the leg. This solution is adequate to connect photovoltaic panels to the electrical grid, among others applications. Evaluation of such a solution by assuming grid modeling is useful and may require powerful simulation tools such as real-time simulator. In order to comply with power processing restrictions, a low frequency model is derived. Performance of both models (high and low frequency) are compared to ensure usability of the low frequency model. Control strategies and modulation are presented. Simulation results are provided to validate the theoretical approach, and real-time simulation results, as well.