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Voltage Weak DC Distribution Grids

机译：弱电压直流配电网

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This paper describes the behavior of voltage weak DC distribution systems. These systems have relatively small system capacitance. The size of system capacitance, which stores energy, has a considerable effect on the value of fault currents, control complexity, and system reliability. A number of potential definitions of voltage weak DC distribution systems are proposed. These definitions address the main characteristics of voltage weak systems. A small signal model of a general voltage weak DC distribution system is developed in order to observe sufficient conditions for system stability. This is achieved by analyzing the dominant poles. The source converters are modeled as droop-controlled current sources in parallel with their respective terminal capacitors. As constant power loads have incremental negative impedances, which affect the system stability, especially, in voltage weak system, ideal constant power loads with their terminal capacitors are included in the small signal model. A three-node voltage weak DC distribution grid is analyzed, as a case study, by implementing the developed small signal model. The effects on system stability by the values of system capacitance, cable inductance, and cable resistance are investigated using dominant pole placement. Likewise, the influence of proportional-integral regulators and droop coefficients of source converters on the stability of the system is examined. Finally, the three node DC distribution grid is developed in MATLAB/Simulink in order to demonstrate the influence of small capacitance on system stability. Moreover, effect of the rate of change of constant power loads on the system stability is simulated. These results are further compared and verified on a voltage weak DC experimental test bench with a 350 VDC bus voltage.
机译：本文介绍了弱电压直流配电系统的行为。这些系统具有相对较小的系统电容。存储能量的系统电容的大小对故障电流的值，控制复杂性和系统可靠性有很大影响。提出了许多弱电压直流配电系统的潜在定义。这些定义解决了弱电压系统的主要特征。为了观察系统稳定的充分条件，开发了一个通用的弱电压直流配电系统的小信号模型。这是通过分析主导极点来实现的。源转换器被建模为与各自的端子电容器并联的下垂控制电流源。由于恒定功率负载具有递增的负阻抗，这会影响系统稳定性，特别是在电压弱的系统中，理想的恒定功率负载及其端接电容器已包含在小信号模型中。通过实施已开发的小信号模型，分析了一个三节点电压弱型DC配电网，作为案例研究。使用主导极位置研究了系统电容，电缆电感和电缆电阻对系统稳定性的影响。同样，研究了比例积分调节器和源转换器的下垂系数对系统稳定性的影响。最后，在MATLAB / Simulink中开发了三节点DC配电网，以演示小电容对系统稳定性的影响。此外，还模拟了恒定功率负载变化率对系统稳定性的影响。这些结果将在具有350 VDC总线电压的弱电压直流实验测试台上进行进一步比较和验证。

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