随着先进的传感、计算机、数字化、信息化等技术在船舶上的广泛应用,使船舶电力系统运行更加高效和智能化,但也增加了船舶电网的复杂性和开放性,使其存在许多潜在的虚假数据注入攻击(false data injection attack, FDIA),严重威胁船舶...随着先进的传感、计算机、数字化、信息化等技术在船舶上的广泛应用,使船舶电力系统运行更加高效和智能化,但也增加了船舶电网的复杂性和开放性,使其存在许多潜在的虚假数据注入攻击(false data injection attack, FDIA),严重威胁船舶电网安全。为解决船舶电力系统易遭遇FDIA的问题,设计一种基于噪声动态估计卡尔曼滤波的检测残差法,运用上述方法检测FDIA。先建立船舶电网的三相电压状态空间模型,分析船舶电网系统遭受FDIA模型;进一步引入噪声在线估计,指数加权和动态滤波异常判据对基本无迹卡尔曼滤波器进行改进,并运用基于改进型卡尔曼滤波的检测残差法来检测FDIA的存在。通过Matlab对比实验得出,提出的方法具备良好的检测能力和优越的检测效果。展开更多
The distribution and treatment of harmful gas （H2S） in the Liaohe Oilfield, Northeast China, were investigated in this study. It was found that abundant toxic gas （H2S） is generated in thermal recovery of heavy oi...The distribution and treatment of harmful gas （H2S） in the Liaohe Oilfield, Northeast China, were investigated in this study. It was found that abundant toxic gas （H2S） is generated in thermal recovery of heavy oil. The H2S gas is mainly formed during thermochemical sulfate reduction （TSR） occurring in oil reservoirs or the thermal decomposition of sulfocompounds （TDS） in crude oil. H2S generation is controlled by thermal recovery time, temperature and the injected chemical compounds. The quantity of SO4^2- in the injected compounds is the most influencing factor for the rate of TSR reaction. Therefore, for prevention of H2S formation, periodic and effective monitoring should be undertaken and adequate H2S absorbent should also be provided during thermal recovery of heavy oil. The result suggests that great efforts should be made to reduce the SO4^2- source in heavy oil recovery, so as to restrain H2S generation in reservoirs. In situ burning or desulfurizer adsorption are suggested to reduce H2S levels. Prediction and prevention of H2S are important in heavy oil production. This will minimize environmental and human health risks, as well as equipment corrosion.展开更多
文摘随着先进的传感、计算机、数字化、信息化等技术在船舶上的广泛应用,使船舶电力系统运行更加高效和智能化,但也增加了船舶电网的复杂性和开放性,使其存在许多潜在的虚假数据注入攻击(false data injection attack, FDIA),严重威胁船舶电网安全。为解决船舶电力系统易遭遇FDIA的问题,设计一种基于噪声动态估计卡尔曼滤波的检测残差法,运用上述方法检测FDIA。先建立船舶电网的三相电压状态空间模型,分析船舶电网系统遭受FDIA模型;进一步引入噪声在线估计,指数加权和动态滤波异常判据对基本无迹卡尔曼滤波器进行改进,并运用基于改进型卡尔曼滤波的检测残差法来检测FDIA的存在。通过Matlab对比实验得出,提出的方法具备良好的检测能力和优越的检测效果。
基金supported by the National Natural Science Foundation of China (Grant No. 4060201640773032)the National Basic Research Program of China (Contract No. 2007CB209500)
文摘The distribution and treatment of harmful gas （H2S） in the Liaohe Oilfield, Northeast China, were investigated in this study. It was found that abundant toxic gas （H2S） is generated in thermal recovery of heavy oil. The H2S gas is mainly formed during thermochemical sulfate reduction （TSR） occurring in oil reservoirs or the thermal decomposition of sulfocompounds （TDS） in crude oil. H2S generation is controlled by thermal recovery time, temperature and the injected chemical compounds. The quantity of SO4^2- in the injected compounds is the most influencing factor for the rate of TSR reaction. Therefore, for prevention of H2S formation, periodic and effective monitoring should be undertaken and adequate H2S absorbent should also be provided during thermal recovery of heavy oil. The result suggests that great efforts should be made to reduce the SO4^2- source in heavy oil recovery, so as to restrain H2S generation in reservoirs. In situ burning or desulfurizer adsorption are suggested to reduce H2S levels. Prediction and prevention of H2S are important in heavy oil production. This will minimize environmental and human health risks, as well as equipment corrosion.
