适用微网故障穿越的多功能并网变换器研究
发布时间：2018-08-10 18:23
【摘要】：微网是发挥分布式电源效能的有效方式,微网的低电压穿越能力(low voltage ride through,LVRT)及保证本地负荷正常供电是需要解决的关键问题之一。电网侧故障超出低电压穿越要求时产生严重过电流,将影响并网逆变器以及关键负荷的安全运行。结合微网结构,提出了一种交直流混合型微网及其并网装置拓扑:当故障电压在LVRT要求范围内,改进谐振控制器型(modified proportional resonant,MPR)动态电压调节器(dynamic voltage restorer,DVR)能够保证本地负荷稳定运行,抑制谐波电压对并网点电压及输出功率的影响;当故障电压超出LVRT要求,通过虚拟阻抗控制抑制过电流。建立了微网及并网变换器在不同类型故障下的不同运行模式切换策略。最后,仿真结果验证了所提拓扑及控制策略的正确性。
[Abstract]:Microgrid is an effective way to exert the efficiency of distributed power generation. One of the key problems that need to be solved is the low voltage traversing capacity of microgrid (low voltage ride through LVRT) and the guarantee of normal local load power supply. Serious overcurrent is produced when the fault of power network side exceeds the requirement of low voltage crossing, which will affect the safe operation of grid-connected inverter and critical load. Combined with the microgrid structure, a hybrid AC / DC microgrid and its grid-connected device topology are proposed. When the fault voltage is within the range required by LVRT, the dynamic voltage regulator (dynamic voltage restorer (DVR) of the resonant controller type (modified proportional resonance can ensure the stable operation of the local load. When the fault voltage exceeds the requirement of LVRT, the overcurrent is suppressed by virtual impedance control. The switching strategies of microgrid and grid-connected converters in different operation modes under different types of faults are established. Finally, the simulation results verify the correctness of the proposed topology and control strategy.
【作者单位】： 国家电能变换与控制工程技术研究中心(湖南大学);长沙理工大学电气与信息工程学院;
【基金】：国家自然科学基金项目(51377051)~~
【分类号】：TM46
[Abstract]:Microgrid is an effective way to exert the efficiency of distributed power generation. One of the key problems that need to be solved is the low voltage traversing capacity of microgrid (low voltage ride through LVRT) and the guarantee of normal local load power supply. Serious overcurrent is produced when the fault of power network side exceeds the requirement of low voltage crossing, which will affect the safe operation of grid-connected inverter and critical load. Combined with the microgrid structure, a hybrid AC / DC microgrid and its grid-connected device topology are proposed. When the fault voltage is within the range required by LVRT, the dynamic voltage regulator (dynamic voltage restorer (DVR) of the resonant controller type (modified proportional resonance can ensure the stable operation of the local load. When the fault voltage exceeds the requirement of LVRT, the overcurrent is suppressed by virtual impedance control. The switching strategies of microgrid and grid-connected converters in different operation modes under different types of faults are established. Finally, the simulation results verify the correctness of the proposed topology and control strategy.
【作者单位】： 国家电能变换与控制工程技术研究中心(湖南大学);长沙理工大学电气与信息工程学院;
【基金】：国家自然科学基金项目(51377051)~~
【分类号】：TM46
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