In this paper, we study a free boundary value problem for two-phase liquid- gas model with mass-dependent viscosity coefficient when both the initial liquid and gas masses connect to vacuum continuously. The gas is as...In this paper, we study a free boundary value problem for two-phase liquid- gas model with mass-dependent viscosity coefficient when both the initial liquid and gas masses connect to vacuum continuously. The gas is assumed to be polytropic whereas the liquid is treated as an incompressible fluid. We give the proof of the global existence and uniqueness of weak solutions whenβ∈ （0, 1）, which have improved the result of Evje and Karlsen, and we obtain the regularity of the solutions by energy method.展开更多
An intelligent coordinated control strategy has been proposed and successfully applied to a 300MW boiler-turbine unit i. e. Unit 1 of Yuanbaoshan power plant in China. Load following operation of coal-fired boiler-tur...An intelligent coordinated control strategy has been proposed and successfully applied to a 300MW boiler-turbine unit i. e. Unit 1 of Yuanbaoshan power plant in China. Load following operation of coal-fired boiler-turbine unit in the power plant leads to changes in operating points which result in nonlinear variations of the plant variables and parameters. For the variation of operating condition and slowly varying dynamics, an intelligent control scheme has been developed by combining fuzzy self-tuning with adaptive control and auto-tuning techniques. As there exist strong couplings between control loops of main steam pressure and power output in the unit, a new design for static decoupler aimed at decoupling for setpoints and unmeasured pulverized coal disturbance of the system at the same time is presented. Satisfactory industrial application results show that such a control system has enhanced adaptability and robustness to the complex process, and better control performance and high economic benefit have been obtained.展开更多
基于自动电压控制技术对电网无功支撑与安全稳定运行的重要作用,介绍光伏并网点无功电压调节机理,以逆变器和静止无功发生器(static var generator,SVG)为研究对象,对光伏电站无功分配策略、SVG无功置换方法进行研究分析,并通过光伏电...基于自动电压控制技术对电网无功支撑与安全稳定运行的重要作用,介绍光伏并网点无功电压调节机理,以逆变器和静止无功发生器(static var generator,SVG)为研究对象,对光伏电站无功分配策略、SVG无功置换方法进行研究分析,并通过光伏电站现场试验验证光伏逆变器与SVG协调控制、无功置换的有效性,对新能源并网电站实现区域电网自动电压控制具有参考意义。展开更多
基金Supported by the National Natural Science Foundation of China (11171340)
文摘In this paper, we study a free boundary value problem for two-phase liquid- gas model with mass-dependent viscosity coefficient when both the initial liquid and gas masses connect to vacuum continuously. The gas is assumed to be polytropic whereas the liquid is treated as an incompressible fluid. We give the proof of the global existence and uniqueness of weak solutions whenβ∈ （0, 1）, which have improved the result of Evje and Karlsen, and we obtain the regularity of the solutions by energy method.
基金This project was supported by the National Nature Science Foundation of China( 60074004).
文摘An intelligent coordinated control strategy has been proposed and successfully applied to a 300MW boiler-turbine unit i. e. Unit 1 of Yuanbaoshan power plant in China. Load following operation of coal-fired boiler-turbine unit in the power plant leads to changes in operating points which result in nonlinear variations of the plant variables and parameters. For the variation of operating condition and slowly varying dynamics, an intelligent control scheme has been developed by combining fuzzy self-tuning with adaptive control and auto-tuning techniques. As there exist strong couplings between control loops of main steam pressure and power output in the unit, a new design for static decoupler aimed at decoupling for setpoints and unmeasured pulverized coal disturbance of the system at the same time is presented. Satisfactory industrial application results show that such a control system has enhanced adaptability and robustness to the complex process, and better control performance and high economic benefit have been obtained.
文摘基于自动电压控制技术对电网无功支撑与安全稳定运行的重要作用,介绍光伏并网点无功电压调节机理,以逆变器和静止无功发生器(static var generator,SVG)为研究对象,对光伏电站无功分配策略、SVG无功置换方法进行研究分析,并通过光伏电站现场试验验证光伏逆变器与SVG协调控制、无功置换的有效性,对新能源并网电站实现区域电网自动电压控制具有参考意义。
