针对目前监视控制和数据采集(supervision control and data acquisition,SCADA)系统和广域测量系统(wide-area measurement system,WAMS)量测数据的特点,提出了一种计及相量测量单元(phasor measurement unit,PMU)的量测量变换状态估...针对目前监视控制和数据采集(supervision control and data acquisition,SCADA)系统和广域测量系统(wide-area measurement system,WAMS)量测数据的特点,提出了一种计及相量测量单元(phasor measurement unit,PMU)的量测量变换状态估计。文中利用量测量变换方法,将SCADA和WAMS下的各类量测转化为等效电压量测,经简化处理得到了常实数信息矩阵,实现了节点电压实部、虚部的解耦计China(NSFC)(50177066).算。该算法具有计算速度快的特点,克服了传统量测量变换状态估计只能处理单一支路功率量测的弊端。IEEE30节点系统算例验证了所提方法的有效性。展开更多
Coherent jet technology has been widely used in EAF steelmaking process because of the longer potential core length and stronger impacting power of the supersonic oxygen jet. However, more oxygen and fuel gas are cons...Coherent jet technology has been widely used in EAF steelmaking process because of the longer potential core length and stronger impacting power of the supersonic oxygen jet. However, more oxygen and fuel gas are consumed to achieve excel- lent characteristics of coherent jets, which causes the increase in steelmaking cost. Computational fluid dynamics simulation and experimental measurement of the coherent jets with CH4 ＋ N2 mixed fuel gas were carried out aiming at reducing the consumption of fuel gas. The numerical simulation results showed good agreement with the experimental data. As a result, high proportion of N2 negatively affects the combustion of CH4, which is not good for the protection of oxygen jets. While the gas composition is 75% CH4 ＋ 25% N2, the N2 addition to the CH4 leads to an expanding of CH4 combustion zone, and the energy generated by the combustion reaction could be delivered to the molten bath more efficiently, which is one control scheme with high performance-price ratio.展开更多
文摘针对目前监视控制和数据采集(supervision control and data acquisition,SCADA)系统和广域测量系统(wide-area measurement system,WAMS)量测数据的特点,提出了一种计及相量测量单元(phasor measurement unit,PMU)的量测量变换状态估计。文中利用量测量变换方法,将SCADA和WAMS下的各类量测转化为等效电压量测,经简化处理得到了常实数信息矩阵,实现了节点电压实部、虚部的解耦计China(NSFC)(50177066).算。该算法具有计算速度快的特点,克服了传统量测量变换状态估计只能处理单一支路功率量测的弊端。IEEE30节点系统算例验证了所提方法的有效性。
基金This work was financially supported by the National Natural Science Foundation of China （Grant Nos. 51574021 and 51474024）.
文摘Coherent jet technology has been widely used in EAF steelmaking process because of the longer potential core length and stronger impacting power of the supersonic oxygen jet. However, more oxygen and fuel gas are consumed to achieve excel- lent characteristics of coherent jets, which causes the increase in steelmaking cost. Computational fluid dynamics simulation and experimental measurement of the coherent jets with CH4 ＋ N2 mixed fuel gas were carried out aiming at reducing the consumption of fuel gas. The numerical simulation results showed good agreement with the experimental data. As a result, high proportion of N2 negatively affects the combustion of CH4, which is not good for the protection of oxygen jets. While the gas composition is 75% CH4 ＋ 25% N2, the N2 addition to the CH4 leads to an expanding of CH4 combustion zone, and the energy generated by the combustion reaction could be delivered to the molten bath more efficiently, which is one control scheme with high performance-price ratio.
