Simplified Control Strategies for Power Converters in a Grid-Connected Hybrid DC-AC Microgrid

T. Busarello, Marcelo Simoes, H. Laaksonen, K. Kauhaniemi
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Abstract

Many typical converter control strategies used in microgrids are complex or require modifications in the power structure. The complexities are due coupling effects among controllers and time-delay caused in exchanging information in the system. This paper proposes simplified control strategies for power converters in a grid-connected hybrid DC-AC microgrid, aiming to ensure precise voltage and current regulation. The used controllers are proportional-resonant, integral-double-lead, proportional-integral and single integral controller. In this paper, the methodology for tuning each controller is carefully described in detail and recommendation for choosing their bandwidth is given. Then, the designed controllers are discretized through the Backward-Euler approximation. The power converters of the microgrid are an inverter, a Buck, a Boost and a bidirectional DC-DC. A case study is conducted through simulations with Matlab/Simulink. Results show that the controlled variables follow their reference signals with negligible steady-state error, proving the efficacy of the simplified control strategies and allowing an stable operation of the microgrid.
并网型直流-交流混合微电网电源变流器的简化控制策略
在微电网中使用的许多典型的变流器控制策略是复杂的或需要修改电力结构。其复杂性主要是由于控制器之间的耦合效应和系统中信息交换产生的时滞。本文提出了并网直流-交流混合微电网中电源变换器的简化控制策略,以保证电压和电流的精确调节。所使用的控制器有比例谐振式、积分双引线式、比例积分式和单积分式。在本文中,对每个控制器的调谐方法进行了详细的描述,并给出了选择其带宽的建议。然后,通过后向欧拉逼近对所设计的控制器进行离散化。微电网的功率变换器有逆变器、降压、升压和双向DC-DC。通过Matlab/Simulink进行了仿真研究。结果表明,被控变量跟随参考信号,稳态误差可忽略不计,证明了简化控制策略的有效性,可以实现微电网的稳定运行。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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