多路数字绝缘电阻测试仪的设计

为了准确可靠地实现电气设备绝缘电阻多路巡回检测,提出了基于PC/104总线的数字绝缘电阻测试仪的结构和系统硬件、软件设计方案;系统选择反激式单片开关电源设计方案,产生250V直流测试电压;采用光电微电子继电器开关电路,检测24路绝缘电阻;采用线性隔离放大电路,提高系统安全性;实现了多路绝缘电阻的巡回检测和自动量程转换功能,绝缘故障时准确报警;实验结果表明,该仪表满足测量多路绝缘电阻的要求,缩短了测试时间,提高了测试效率,运行性能良好.     

飞轮储能系统及其运行控制技术研究

设计了用于电力系统的飞轮储能（FES）系统，该系统主要包括储存能量的飞轮、支撑飞轮的轴承、进行机电能量转换的异步电动／发电机和微控制器控制的电能转换系统，研究了FES系统中异步电机动态过程仿真计算问题，提出了VVVF逆变器控制的异步电机动态数值模型，给出了采用四阶龙格库塔方法求解FES系统加速储能过程数值仿真结果，进行了FES系统加速储能试验和与电网步运行控制试验，给出了试验测试结果。     

矩阵式变换器驱动异步电机调速系统的非线性自抗扰控制

相对于传统的脉宽调制(PWM)型变频器,矩阵式变换器驱动异步电机调速系统具有一系列优势,如不需要直流储能元件,高输入功率因数和能量双向流通能力.但是,由于矩阵式变换器的直接变换特性,异步电机系统的调速性能易受到矩阵式变换器输入侧电压扰动的影响.本文将一种具有良好鲁棒性的非线性自抗扰控制器(ADRC)应用于矩阵式变换器驱动异步电机调速系统,设计了控制器的结构和参数,用其代替了传统的比例-积分(PI)调节器.在调速系统中,非线性自抗扰控制器对由外部扰动和模型不确定性引起的内部扰动进行估计和补偿.仿真结果表明,采用上述非线性控制器提高了调速系统在矩阵式变换器输入电压非正常工况下的抗干扰能力,并改善了异步电机的动态调速性能.     

A Robust Deadbeat Control Method for UPS Inverters

The traditional deadbeat control for UPS inverters has a robustness problem. The parametric imprecision can greatly harm the stability of the system, which restricts the application. A novel robust deadbeat control method is proposed in this paper to deal with the problem. In the proposed control method, a proportional element is added to the traditional deadbeat control in order to improve the robustness to parametric imprecision. To eliminate the error between output voltage and voltage reference caused by environmental noise and parametric deviation, a model reference adaptive regulator is also added to the control method. A 1kVA prototype is built based on DSP. Theoretical analysis and experimental results show that the robustness for parametric variation of the proposed method is much better than the traditional deadbeat control. The system can remain stable even when the systemic parameters have a large deviation from calculating parameters. The system has small static error and fast dynamic response with the new control method. This method is easy to realize in DSP and is suitable for full digital realization of UPS.