盲区小的燃料电池并网系统孤岛检测方法

发布时间：2018-03-06 16:36

本文选题：燃料电池并网系统　切入点：逆变器　出处：《电力系统自动化》2017年06期 　论文类型：期刊论文

【摘要】：为保护系统及人身安全、保障用户供电质量,燃料电池并网系统必须具备孤岛检测功能。文中提出一种检测速度快、盲区小的新型孤岛检测方法——ASMS_Q法。该方法对滑模频率偏移法进行改进,在偏离工频较大区域加入加速增益,并结合q轴无功电流扰动法,在电网断开后,进行更快速地频率扰动,使其超出正常范围,达到过/欠频保护。而且电网正常工作时,给电网注入扰动量很小,对逆变器输出电能质量没有影响。在Q_f-f_0和Q_(f_0)-C_(norm)坐标系下,对比分析了ASMS_Q法及两种传统方法的盲区。仿真和实验结果表明,ASMS_Q法比传统的主动式检测方法盲区更小,检测速度更快,适用于高品质因素的负载。
[Abstract]:In order to protect the system and personal safety and ensure the quality of power supply to users, the fuel cell grid-connected system must have the function of islanding detection. A new isolated island detection method with small blind area, ASMSQ method, is proposed. The sliding mode frequency offset method is improved by adding acceleration gain in the area of deviation from power frequency, and combining with Q axis reactive current perturbation method, after the power network is disconnected, The frequency disturbance is carried out faster, beyond the normal range to achieve over-/ under-frequency protection. Moreover, when the power network is working normally, the amount of disturbance injected into the power network is very small, which has no effect on the output power quality of the inverter. The blind area of ASMS_Q method and two traditional methods are compared and analyzed. The simulation and experiment results show that the blind area is smaller and the detection speed is faster than the traditional active detection method, which is suitable for the load of high quality factors.
【作者单位】：武汉理工大学自动化学院;
【基金】：国家自然科学基金资助项目(61673306)~~
【分类号】：TM911.4;TM73

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