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Fuzzy logic approach for smooth transition between grid-connected and stand-alone modes of three-phase DG-inverter

机译:三相DG逆变器并网和单机模式平滑过渡的模糊逻辑方法

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摘要

In distributed generation systems, the worst case of operation is a sudden transition between Grid-Connected mode (GC) and Stand-Alone mode (SA). In this situation, system state variables, such as abrupt changes in currents, risk to contribute to the destruction of the whole power system. In this work, the use of the Fuzzy Logic (FL)-based approach for smooth transition between GC and SA is investigated. In contrast with the classical approach where the transition is a direct and abrupt change from the GC control mode to the SA mode, the Fuzzy Logic Algorithm (FLA) allows generating a feasible reference trajectory that ensures smooth transition between GC and SA modes through a unified control. Furthermore, the FL is employed to tune the voltage loop control in order to increase the disturbance rejection ability of the voltage loop. Also, the control design and the trajectory planning principle are detailed. The effectiveness of the proposed control is validated by simulation tests and its performance is compared to a conventional control scheme.
机译:在分布式发电系统中,最坏的运行情况是并网模式(GC)和独立模式(SA)之间突然过渡。在这种情况下,系统状态变量(例如电流的突然变化)可能会损坏整个电源系统。在这项工作中,研究了基于模糊逻辑(FL)的方法在GC和SA之间的平滑过渡。与经典方法(从GC控制模式到SA模式的转变是直接而突然的转变)相反,模糊逻辑算法(FLA)允许生成可行的参考轨迹,从而确保通过统一的模式在GC和SA模式之间进行平滑过渡控制。此外,FL用于调节电压环路控制,以提高电压环路的抗干扰能力。此外,详细介绍了控制设计和轨迹规划原理。通过仿真测试验证了所提出控制的有效性,并将其性能与常规控制方案进行了比较。

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