In this study, a novel bandpass filter (BPF)-based control strategy is proposed for operating an isolated microgrid (MG) formed by a solar photovoltaic (PV) array and permanent magnet synchronous generator-based small hydro system. Due to intermittencies in the PV array and loads, a battery energy storage (BES) is used to maintain power balancing between load and source. The BES is input to bidirectional converter (BDC), whose output is connected to voltage source converter of DC link and it regulates the voltage of DC link. The charging and discharging currents of the battery are also controlled by BDC. The maximum power is extracted from the PV array using modified incremental conductance-based MPPT control, which is made to operate in derating mode when BES is overcharged. The VSC is used to control the load fluctuations by implementing voltage and frequency control schemes. The BPF-based control technique is used to mitigate harmonics, to provide reactive power compensation and load balancing during unbalanced non-linear loading conditions. It also has the capability of removing DC offset, higher order and lower order harmonics from input load currents, effectively. The performance of this MG is validated on an experimental prototype developed in the laboratory.

中文翻译：

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一种基于带通滤波器的新型控制策略，用于控制Hydro-PV-BES支持的孤立MG

在这项研究中，提出了一种新颖的基于带通滤波器（BPF）的控制策略，用于操作由太阳能光伏（PV）阵列和基于永磁同步发电机的小型水力系统形成的隔离微电网（MG）。由于光伏阵列和负载之间的间歇性，电池储能（BES）用于维持负载和电源之间的功率平衡。BES输入到双向转换器（BDC），其输出连接到直流母线的电压源转换器，并调节直流母线的电压。电池的充电和放电电流也由BDC控制。使用改进的基于增量电导的MPPT控制可从PV阵列中提取最大功率，当BES过充电时，该功率可在降额模式下运行。VSC通过实施电压和频率控制方案来控制负载波动。基于BPF的控制技术用于减轻谐波，在不平衡的非线性负载条件下提供无功功率补偿和负载平衡。它还具有有效消除输入负载电流中的直流偏移，高阶和低阶谐波的能力。该MG的性能已在实验室开发的实验原型上得到验证。