UPFCs control design for avoiding generator trip of electric power grid with barrier function
UPFCs control design for avoiding generator trip of electric power grid with barrier function
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DOI：
10.1016/j.ijepes.2014.12.058
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发表时间：
2015-06
影响因子：
5.2
通讯作者：
Jian Sun-;Jian Sun-;Y. Chai;Y. Hu;Honghao Zheng;Rui Ling;Ke Zhang
中科院分区：
文献类型：
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作者：
Jian Sun-;Jian Sun-;Y. Chai;Y. Hu;Honghao Zheng;Rui Ling;Ke Zhang
提出了一种新的统一潮流控制器（UPFC）暂态控制方案，以避免电网中的发电机跳闸。控制方案是由一个建议的控制李雅普诺夫函数，其中包括能量函数和障碍函数。由于UPFC施加的障碍函数惩罚，防止了不期望的发电机跳闸，因为当发电机频率偏差接近预设阈值时，障碍函数的值接近无穷大。UPFC装置的控制作用使得控制李雅普诺夫函数的时间导数为负，从而使系统渐近稳定。控制系统以期望的稳定平衡点重新塑造了系统的吸引域，并在该吸引域内防止了发电机跳闸。同时讨论了吸引域及其设计。通过3节点和IEEE 162节点试验系统的仿真计算，验证了该方法的有效性。
A novel transient control scheme for unified power flow controller (UPFC) devices is proposed for avoiding generator trip in electrical power grid. The control scheme is derived by an proposed control lyapunov function, which consists of energy function and barrier functions. Undesirable generator trips are prevented thanks to the barrier functions penalty imposed by UPFCs, because the value of the barrier function approaches infinity as generator frequency deviation approaches pre-set threshold. The control effects of the UPFC devices make the time derivative of control lyapunov function be negative for asymptotic stability. The attraction region of the system is reshaped by control system with the desired stable equilibrium point, and the generator trips are prevented in this region. Meanwhile, the attraction region and its design are discussed. Two numerical simulations are carried out using 3 bus and IEEE 162 bus test system, to demonstrate the effectiveness of the proposed method.