A soft sensing method of burning through point (BTP) was described and a new predictive parameter—the mathematics inflexion point of waste gas temperature curve in the middle of the strand was proposed. The artificia...A soft sensing method of burning through point (BTP) was described and a new predictive parameter—the mathematics inflexion point of waste gas temperature curve in the middle of the strand was proposed. The artificial neural network was used in predicting BTP, modification on backpropagation algorithm was made in order to improve the convergence and self organize the hidden layer neurons. The adaptive prediction system developed on these techniques shows its characters such as fast, accuracy, less dependence on production data. The prediction of BTP can be used as operation guidance or control parameter.[展开更多
An empirical dynamic model of burn-through point（BTP）in sintering process was developed.The K-means clustering was used to feed distribution according to the cold bed permeability,which was estimated by the superfic...An empirical dynamic model of burn-through point（BTP）in sintering process was developed.The K-means clustering was used to feed distribution according to the cold bed permeability,which was estimated by the superficial gas velocity in the cold stage.For each clustering,a novel genetic programming（NGP）was proposed to construct the empirical model of the waste gas temperature and the bed pressure drop in the sintering stage.The least square method（LSM）and M-estimator were adopted in NGP to improve the ability to compute and resist disturbance.Simulation results show the superiority of the proposed method.展开更多
分布式新能源出力具有波动性,且接入位置不均匀,当其规模化接入配电网后将增大发生故障的概率。在配电网发生故障时,增强并网电力电子设备的低电压穿越(low voltage ride through,LVRT)性能是保障配电网稳定运行的技术关键,已成为当前...分布式新能源出力具有波动性,且接入位置不均匀,当其规模化接入配电网后将增大发生故障的概率。在配电网发生故障时,增强并网电力电子设备的低电压穿越(low voltage ride through,LVRT)性能是保障配电网稳定运行的技术关键,已成为当前研究热点之一。以柔性互联配电网中的柔性电力电子开关(soft open point,SOP)为对象,结合配电网馈线线路阻抗特性,提出一种基于线路阻抗特性的SOP LVRT控制策略。首先,分析线路阻抗对换流器接入公共耦合点(point of common coupling,PCC)电压的影响,并推导出利用换流器注入功率抬升电压的机理;其次,提出基于馈线出线侧及换流器本地量测数据的PCC点至故障点的线路等效阻抗测量方法;然后,构建基于阻抗测量法的SOP LVRT整体策略;最后,在PSCAD仿真平台上验证所提控制策略,结果表明,在不同电压跌落范围内,所提SOP LVRT控制策略能同时补偿有功功率和无功功率,较仅采用无功补偿能更明显提升PCC电压水平。展开更多
文摘A soft sensing method of burning through point (BTP) was described and a new predictive parameter—the mathematics inflexion point of waste gas temperature curve in the middle of the strand was proposed. The artificial neural network was used in predicting BTP, modification on backpropagation algorithm was made in order to improve the convergence and self organize the hidden layer neurons. The adaptive prediction system developed on these techniques shows its characters such as fast, accuracy, less dependence on production data. The prediction of BTP can be used as operation guidance or control parameter.[
基金Sponsored by National Natural Science Foundation of China(60736021,21076179)National High-Technologies Research and Development Program of China(863 Program)(2006AA04Z184,2007AA041406)+1 种基金Key Technologies Research and Development Program of Zhejiang Province of China(2006C11066,2006C31051)Natural Science Foundation of Zhejiang Province of China(Y4080339)
文摘An empirical dynamic model of burn-through point（BTP）in sintering process was developed.The K-means clustering was used to feed distribution according to the cold bed permeability,which was estimated by the superficial gas velocity in the cold stage.For each clustering,a novel genetic programming（NGP）was proposed to construct the empirical model of the waste gas temperature and the bed pressure drop in the sintering stage.The least square method（LSM）and M-estimator were adopted in NGP to improve the ability to compute and resist disturbance.Simulation results show the superiority of the proposed method.
文摘分布式新能源出力具有波动性,且接入位置不均匀,当其规模化接入配电网后将增大发生故障的概率。在配电网发生故障时,增强并网电力电子设备的低电压穿越(low voltage ride through,LVRT)性能是保障配电网稳定运行的技术关键,已成为当前研究热点之一。以柔性互联配电网中的柔性电力电子开关(soft open point,SOP)为对象,结合配电网馈线线路阻抗特性,提出一种基于线路阻抗特性的SOP LVRT控制策略。首先,分析线路阻抗对换流器接入公共耦合点(point of common coupling,PCC)电压的影响,并推导出利用换流器注入功率抬升电压的机理;其次,提出基于馈线出线侧及换流器本地量测数据的PCC点至故障点的线路等效阻抗测量方法;然后,构建基于阻抗测量法的SOP LVRT整体策略;最后,在PSCAD仿真平台上验证所提控制策略,结果表明,在不同电压跌落范围内,所提SOP LVRT控制策略能同时补偿有功功率和无功功率,较仅采用无功补偿能更明显提升PCC电压水平。
