In the analysis of the 480t/h circulating fluidized bed boiler's technical process and characteristics,this paper gives CFB boiler control system's function and composition based on the basis of DCS control andanalysis in detail some problems such as coal poor judgments,a reasonable distribution of wind in the proces starting and running,control of coal feeding system,avoiding the furnace bed material agglomeration,coking and burning,protection and coordination of the system control.The result of operating the CFB boiler control system presented in the paper shows this program can address the broken coal and coal blocking and the problem that CFB boiler is difficult to put into automatically using of coal,primary air,secondary air multi-variable integrated control,which is for the unit stable and laid the foundation for reliable operation.

通过对10kV配电线路停电原因的分析,指出影响配电网系统供电可靠性的因素,并提出了解决办法.展望了采用新技术提高配电网供电可靠性的前景.

解列和切负荷是维持电网稳定,防止"电压崩溃"和"频率崩溃"的重要措施,应用AT89C52单片机及外围设备构成互联网解列装置,可对电网参数实时在线监视,根据电网稳定计算的结论,实施解列或切负荷,恢复电网稳定.

The working principle and hardware as well as software of full-automatic diesel oilemulsification equipment based on single chip computer is discussed.This equipment has many functions,working automatically and continually,setting the proportion of mixing,safety,self-checking,alarming,and so on.

本文对分选系统的工作原理、硬件配置及软件流程作了简要说明,具有自动化程高,分类迅速、准确等优.

本文提出了一种以SD(Singed-Digit)数表示的求和计算方法,克服了传统的二进制数表示求和过程中产生的进位对运算速度的限制.并在此基础上应用硬件描述语言(VHDL)设计实现了基于可编程逻辑器件(PLD)的SD加法器,简化了求和运算过程.实验证明,通过这种算法可得到运算速度高、电路结构简单的高速加法器.以满足数字信号处理(DSP)系统的高性能要求.

与两电平PWM驱动相似,多电平PWM电压源逆变器也可以产生共模电压,从而产生电机轴电压和轴承电流.本文通过仿真分析可知,与两电平逆变器相比,采用三电平逆变中以有效降低电机端共模电压,从而减小电机端轴电压和轴承电流,提高PWM驱动系统的可靠性和延长电机的寿命.