高风电渗透率下的自适应低频减载策略研究

发布时间：2019-01-06 07:42

【摘要】：针对风电迅猛发展和电源结构发生深刻变化的新形势,详细论述了高风电渗透率对低频减载实施效果的影响,并计及主要影响因素提出一种自适应减载策略以适用于高风电渗透下的电网。该策略通过对不平衡功率实施动态计算,来解决风电出力的波动影响和等值惯性时间常数难以解析计算的问题;考虑负荷特性来构建减载的选址定容模型,以改善减载后的频率恢复效果;合理应用减载轮次的闭锁判据,来有效降低负荷过切概率。将所提策略应用在高风电渗透率下的IEEE-39节点系统中,仿真结果表明,在多个故障场景下,所提策略能够及时获取频率变化率的阶跃特征,并对减载参数进行校正更新或者合理闭锁减载轮次,从而有效地保证了系统频率稳定性,具备较好的有效性和鲁棒性。
[Abstract]:In view of the new situation of the rapid development of wind power and the profound changes in power supply structure, the influence of high wind power permeability on the implementation effect of low frequency load reduction is discussed in detail. Considering the main factors, an adaptive load reduction strategy is proposed to apply to the power system with high wind power penetration. The dynamic calculation of unbalanced power is carried out to solve the problem of the fluctuation of wind power output and the difficulty of calculating the equivalent inertial time constant. In order to improve the effect of frequency recovery after load reduction, the load reduction location and volume model is constructed by considering the load characteristics, and the load reduction probability is effectively reduced by using the locking criterion of the load reduction cycle. The proposed strategy is applied to the IEEE-39 node system with high wind power permeability. The simulation results show that the proposed strategy can obtain the step characteristics of the frequency change rate in time under multiple fault scenarios. The parameters of load reduction are corrected and updated, or the load reduction cycles are locked reasonably, so that the frequency stability of the system is effectively guaranteed, and the system is effective and robust.
【作者单位】：武汉大学电气工程学院;国网湖北省电力公司经济技术研究院;
【基金】：国家自然科学基金资助项目(51507116)~~
【分类号】：TM712;TM614

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