基于变下垂系数的直流配电网自适应虚拟惯性控制

发布时间：2018-10-21 13:39

【摘要】：直流配电网采用电压下垂控制具有较好的稳定性,但对高频随机功率波动的调节能力较差。文中研究了适用于直流配电网电压下垂控制的虚拟惯性控制方法,以兼顾调压器的快速性和稳定性,改善直流配电网电压质量。所述控制策略在功率波动瞬间通过调压器下垂特性曲线的摆动,快速释放或吸收能量,相当于在直流侧虚拟出比实际电容大得多的虚拟电容,提高了系统惯性,有效抑制了直流电压波动。同时,理论分析了在不同运行情况下该控制策略所能提供的具体的虚拟惯性裕度,在此范围内根据电压大小自适应地调节下垂系数,提供大小可变的惯性支持,从而使系统获得最佳动态响应。最后,在MATLAB/Simulink中搭建了四端风储直流配电网系统并进行仿真验证,结果表明所述控制策略能够起到改善系统暂态响应、提高直流母线电压质量,以及平滑与交流主网交换功率的作用。
[Abstract]:The voltage sag control of DC distribution network has good stability, but its ability to adjust the high frequency random power fluctuation is poor. In this paper, a virtual inertial control method for voltage droop control in DC distribution network is studied, which takes into account the speed and stability of voltage regulator and improves the voltage quality of DC distribution network. The control strategy can rapidly release or absorb energy through the swing of the voltage regulator droop characteristic curve at the moment of power fluctuation, which is equivalent to the virtual capacitance which is much larger than the actual capacitance on the DC side, and improves the inertia of the system. The DC voltage fluctuation is effectively suppressed. At the same time, the specific virtual inertia margin can be provided by the control strategy under different operation conditions. In this range, the sag coefficient can be adjusted adaptively according to the voltage, and the inertia support with variable size is provided. Thus, the optimal dynamic response of the system is obtained. Finally, a four-terminal wind storage DC distribution network system is built in MATLAB/Simulink. The simulation results show that the proposed control strategy can improve the transient response of the system and improve the quality of DC bus voltage. And smooth and AC main network switching power role.
【作者单位】：新能源电力系统国家重点实验室(华北电力大学);
【基金】：国家高技术研究发展计划(863计划)资助项目(2015AA050101)~~
【分类号】：TM727

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