風(fēng)電采用MGP并網(wǎng)的小干擾建模和阻尼特性
[Abstract]:In order to solve the problem of low inertia and weak damping caused by high proportion of new energy sources, a new energy synchronous motor (MGP) grid connection mode is proposed. The small disturbance modeling method of MGP is described in detail. Firstly, by analyzing the power angle relation of MGP and considering the excitation system dynamics, a small disturbance model including automatic voltage regulator and power system stabilizer is established, and the damping torque superposition effect in MGP is pointed out. Then, considering the state variables of the doubly-fed fan, a complete small disturbance state equation is established for its docking with MGP. On this basis, the dynamic characteristics based on K coefficient and the representation of torque components are derived. It is revealed that the nature of the damping torque superposition effect of MGP is the coupling property of double excitation. Finally, based on the model, the small disturbance stability characteristics of MGP and traditional units are compared, and two grid-connected modes of doubly-fed fan and MGP are used. The effect of coupling characteristics of double excitation on the oscillation modes dominated by blower is studied. The results show that the proposed small disturbance modeling method can accurately reflect the dual excitation coupling characteristics of the MGP system, which can effectively enhance the damping torque component and improve the oscillation mode of the system.
【作者單位】: 新能源電力系統(tǒng)國家重點實驗室(華北電力大學(xué));
【分類號】:TM614;TM743
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