摘要
准确预测变压器油中溶解故障特征气体的体积分数对发现变压器早期潜伏性故障,实现电力系统安全经济运行具有重要意义。将灰色多变量预测方法和马尔可夫链理论有机结合,提出了一种适合变压器故障特征气体体积分数预测的灰色马尔可夫组合预测模型。利用优化的背景值构造公式建立灰色多变量模型对变压器故障特征气体时间序列的宏观发展规律进行动态预测,在此基础上,建立故障特征气体时间序列的状态转移概率矩阵,以归一化的各阶自相关系数作为权重值,通过加权马尔可夫链模型修正灰色多变量模型预测值,实现变压器故障特征气体体积分数的预测,预测精度较高。实际算例分析验证了该模型的实用性和有效性。
How to improve wind energy efficiency and to achieve maximum power point tracking (MPPT) has become the world research hot spot.As Variable Speed Constant Frequency (VSCF) doubly fed induction generator (DFIG) is the mainstream model of wind power,the MPPT research of it has a strong practical significance.Through the analysis of the operation characteristics of wind turbine,combining with the current MPPT control methods,a novel way,which connects fuzzy control with improved variabJe step length perturbation method,is put forward in this paper.
出处
《工业控制计算机》
2012年第9期47-49,共3页
Industrial Control Computer