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A novel droop control method based on virtual frequency in DC microgrid

机译:基于DC微电网虚拟频率的新型下垂控制方法

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In the DC microgrid with traditional droop control, the inconsistency of circuit parameters and line impedance results in the diverse droop characteristics of DC-DC converters, which reduces the current sharing accuracy of converters. Meanwhile, droop control inevitably leads to DC-bus voltage deviation and the secondary control has the problem of poor communication fault tolerance. To improve the control performance of DC microgrid, a droop control method based on virtual frequency is proposed by simulating the frequency droop control mechanism in AC microgrid. A virtual voltage with a frequency proportional to the output current is constructed and shared among the converters through low bandwidth communication (LBC). The phase difference among virtual voltages generates virtual reactive power, which is calculated by Fourier transform to coordinate the output current of each converter. The algorithm can keep high performance under some communication faults and can guarantee that the converter with serious communication faults can automatically exit the current sharing control without affecting other converters. Moreover, the actual reactive power and harmonics wouldn't be introduced, and the power quality of the microgrid can be ensured. The stability of the algorithm is demonstrated by small-signal analysis and mathematical calculation. Finally, simulation and experiment show that the algorithm has high current sharing accuracy, excellent communication fault tolerance and plug-play performance.
机译:在具有传统下垂控制的DC MicroGrid中,电路参数和线路阻抗的不一致导致DC-DC转换器的不同下垂特性,这降低了转换器的电流共享精度。同时,下垂控制不可避免地导致直流电压偏差,二次控制具有差的通信容错问题。为了提高DC MicroGrid的控制性能,通过模拟AC微电网中的频率下垂控制机制来提出基于虚拟频率的下垂控制方法。具有与输出电流成比例的频率的虚拟电压通过低带宽通信(LBC)在转换器中构造和共享。虚拟电压之间的相位差产生虚拟无功功率,该功率由傅立叶变换计算以协调每个转换器的输出电流。该算法可以在一些通信故障下保持高性能,并可以保证具有严重通信故障的转换器可以自动退出电流共享控制而不会影响其他转换器。此外,无法引入实际的无功功率和谐波,并且可以确保微电网的功率质量。通过小信号分析和数学计算证明了算法的稳定性。最后,仿真和实验表明该算法具有高电流共享精度,优异的通信容错和即插即用性能。

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