模糊控制在直流电源控制器中的应用研究

针对现有 PI控制的不足 ,提出了一种基于模糊控制的智能直流电源控制策略及其实现方法。将模糊控制和 PI控制的性能优劣进行比较 ,实验结果证明模糊控制在直流电源控制器中具有良好的应用前景。

气象水电解制氢设备整流电源控制系统常见故障分析及应急预案

文章结合西藏QDQ2-1型气象水电解制氢设备在日常运行中整流控制电源常见的故障,分析故障的起因、介绍故障的排除方法;并对制氢设备电源出现故障时的应急处置提出建议。

基于AVR单片机的直流接地故障检测设备校验仪研制

介绍了直流接地故障检测设备校验仪的工作原理和设计过程,其中着重介绍了直流电源控制电路、电阻电容配置电路、通信电路以及软件的设计。

一起66kV变电所越级跳闸事故分析

本文通过针对一起66kV变电所越级跳闸事故现场调查、事故前后试验数据以及现场运行情况,综合分析了越级跳闸事故的主要原因,是由于10kV系统谐振过电压和控制直流电源的不可靠造成的,并提出了相应的防范措施。

Investigation of Interline Dynamic Voltage Restorer with Virtual Impedance Injection

The inter-line dynamic voltage restorer （IDVR） consists of several voltage source inverters connected to different independent distribution feeders with common dc bus. When one of the inverters compensates for voltage sag that appears in its feeder （voltage control mode）, the other inverters pump the required power into the dc bus （power control mode）. Each inverter will have both voltage and power controllers; only one controller is in use during the abnormal conditions according to its feeder state. The voltage controller uses one of the dynamic voltage restoration techniques. In this paper, the in-phase technique is applied and two types of loads are considered （constant impedance and three phase induction motor）. Since the voltage restoration process may need real power injection into the distribution system, the power controller injects this power via voltage injection. This voltage injection is simulated by voltage drop across series virtual impedance. A new scheme is proposed to select the impedance value. The impedance value is selected such that the power consumed by this impedance represents the required power to be transferred without perturbing the load voltage. The performance of this system is also studied during voltage swell. A scheme for operation of multi-feeder IDVR system is proposed in this paper. Simulation results substantiate the proposed concept.

中频炉微机控制系统的研制

介绍了一种专用于熔炼的中频炉电源的构成及原理,其整流和逆变鄙分均由单片机控制,买现对负载频率的自动跟踪,具有故障检测和调节功能,达至量大功率输出,满足用户速度快、效率高的要求。