直流微电网虚拟惯性控制及其稳定性分析
发布时间：2018-12-14 12:20
【摘要】：针对直流微电网惯性低,母线电压抗干扰能力差的问题,考虑直流微电网中各旋转设备和储能设备的潜在惯性支持能力,提出直流微电网虚拟惯性控制。首先,给出了直流微电网中各可控电源提供的惯性功率的通用的表达式,该惯性功率直接由直流母线电压变化量及虚拟惯性控制系数确定;其次,在设计各变流器附加惯性控制时,采用一阶惯性环节代替了微分环节,避免了对输入信号产生高频干扰;再次,建立了直流微电网的小信号模型,分析了加入虚拟惯性控制后直流微电网的稳定性,给出了虚拟惯性控制系数的选取范围;最后,在Matlab/Simulink中建立了直流微电网模型并进行了时域仿真,验证了所提控制策略的有效性以及稳定性分析的正确性。
[Abstract]:Considering the potential inertial support ability of each rotating equipment and energy storage equipment in DC microgrid, the virtual inertial control of DC microgrid is proposed in view of the low inertia of DC microgrid and poor anti-interference ability of bus voltage. Firstly, the general expression of inertia power provided by controlled power supply in DC microgrid is given. The inertia power is directly determined by DC bus voltage variation and virtual inertia control coefficient. Secondly, in the design of the additional inertial control of each converter, the first-order inertial link is used instead of the differential link to avoid the high-frequency interference to the input signal. Thirdly, the small signal model of DC microgrid is established, the stability of DC microgrid with virtual inertial control is analyzed, and the selection range of virtual inertial control coefficient is given. Finally, the DC microgrid model is established in Matlab/Simulink and the time-domain simulation is carried out to verify the validity of the proposed control strategy and the correctness of the stability analysis.
【作者单位】： 新能源电力系统国家重点实验室(华北电力大学);国网菏泽供电公司;
【分类号】：TM727
[Abstract]:Considering the potential inertial support ability of each rotating equipment and energy storage equipment in DC microgrid, the virtual inertial control of DC microgrid is proposed in view of the low inertia of DC microgrid and poor anti-interference ability of bus voltage. Firstly, the general expression of inertia power provided by controlled power supply in DC microgrid is given. The inertia power is directly determined by DC bus voltage variation and virtual inertia control coefficient. Secondly, in the design of the additional inertial control of each converter, the first-order inertial link is used instead of the differential link to avoid the high-frequency interference to the input signal. Thirdly, the small signal model of DC microgrid is established, the stability of DC microgrid with virtual inertial control is analyzed, and the selection range of virtual inertial control coefficient is given. Finally, the DC microgrid model is established in Matlab/Simulink and the time-domain simulation is carried out to verify the validity of the proposed control strategy and the correctness of the stability analysis.
【作者单位】： 新能源电力系统国家重点实验室(华北电力大学);国网菏泽供电公司;
【分类号】：TM727
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