非侵入式负荷监测对开展节能工作,提供负荷调峰信息以及建设智能电网具有重要的现实意义。针对目前非侵入式负荷监测和分解方法在低频采样条件下识别准确度低的问题,提出了一种考虑状态概率因子和状态修正的非侵入式负荷分解方法。首先...非侵入式负荷监测对开展节能工作,提供负荷调峰信息以及建设智能电网具有重要的现实意义。针对目前非侵入式负荷监测和分解方法在低频采样条件下识别准确度低的问题,提出了一种考虑状态概率因子和状态修正的非侵入式负荷分解方法。首先,对预先获取的电力数据进行meanshift聚类,构建负荷不同状态下的功率模板;然后,在传统功率特征的基础上,将状态概率因子(state probability factor,SPF)作为新特征引入目标函数,通过改进的多特征遗传优化迭代实现负荷分解;最终对分解结果进行异常状态修正。在AMPds数据集上对算法性能进行了评估,仿真结果显示上述方法可有效提高负荷分解的准确性。展开更多
The coupling between system and reservoir is considered to be linear in the coordinates of the bath but nonlinear in the system's coordinate. A dissipative threshold is observed at finite temperatures due to nonli...The coupling between system and reservoir is considered to be linear in the coordinates of the bath but nonlinear in the system's coordinate. A dissipative threshold is observed at finite temperatures due to nonlinear dissipation. The quantum decay rate of a metastable state including higher-order expanded terms of the coupling form function is proposed, which can be strongly decreased at finite temperatures when the quantum dissipative threshold is added to the saddle point of the potential.展开更多
Coal is the principal form of energy used in China. Hence, coal price variations are expected to have some influence on merchandise prices. Monthly data from January, 2002, to October, 2010, were used to construct a v...Coal is the principal form of energy used in China. Hence, coal price variations are expected to have some influence on merchandise prices. Monthly data from January, 2002, to October, 2010, were used to construct a varying-parameter state space model, and an error correction model, to estimate the influence of coat prices on Chinese merchandise prices. The time lag and the dynamic relationship were determined from the data. A long term equilibrium relationship between coal price and the PPI, and the CPI, can be observed. The long term influence of coal price fluctuations on the PPI is 0.263%. The corresponding value for the CPI is 0.157%. The PPI shows an influence from coal price change in the first period of observation： by eight periods the influence is obvious, after which it diminishes. The effect of coal price change on the CPI is rather weak and has no long term memory. Analysis of variance shows a similar situation. The elas- ticity coefficient of coal prices on the CPI, or the PPI, fluctuates over the 2002-2004 period. From 2002 to 2007 the influence elasticity on the CPI declined and subsequently levelled off after 2009.展开更多
文摘非侵入式负荷监测对开展节能工作,提供负荷调峰信息以及建设智能电网具有重要的现实意义。针对目前非侵入式负荷监测和分解方法在低频采样条件下识别准确度低的问题,提出了一种考虑状态概率因子和状态修正的非侵入式负荷分解方法。首先,对预先获取的电力数据进行meanshift聚类,构建负荷不同状态下的功率模板;然后,在传统功率特征的基础上,将状态概率因子(state probability factor,SPF)作为新特征引入目标函数,通过改进的多特征遗传优化迭代实现负荷分解;最终对分解结果进行异常状态修正。在AMPds数据集上对算法性能进行了评估,仿真结果显示上述方法可有效提高负荷分解的准确性。
文摘The coupling between system and reservoir is considered to be linear in the coordinates of the bath but nonlinear in the system's coordinate. A dissipative threshold is observed at finite temperatures due to nonlinear dissipation. The quantum decay rate of a metastable state including higher-order expanded terms of the coupling form function is proposed, which can be strongly decreased at finite temperatures when the quantum dissipative threshold is added to the saddle point of the potential.
基金support for this work, provided by the National Natural Science Foundation of China (No. 71003097)Jiangsu Province Social Science Foundation (No. 10EYD025)2008 China University of Mining and Technology Youth Foundation Program (No.2008W04)
文摘Coal is the principal form of energy used in China. Hence, coal price variations are expected to have some influence on merchandise prices. Monthly data from January, 2002, to October, 2010, were used to construct a varying-parameter state space model, and an error correction model, to estimate the influence of coat prices on Chinese merchandise prices. The time lag and the dynamic relationship were determined from the data. A long term equilibrium relationship between coal price and the PPI, and the CPI, can be observed. The long term influence of coal price fluctuations on the PPI is 0.263%. The corresponding value for the CPI is 0.157%. The PPI shows an influence from coal price change in the first period of observation： by eight periods the influence is obvious, after which it diminishes. The effect of coal price change on the CPI is rather weak and has no long term memory. Analysis of variance shows a similar situation. The elas- ticity coefficient of coal prices on the CPI, or the PPI, fluctuates over the 2002-2004 period. From 2002 to 2007 the influence elasticity on the CPI declined and subsequently levelled off after 2009.
