加工中心刀具破损监控系统的研制

综合应用声发射（AE）和电机电压电流信号法监控刀具破损，可提高刀具破损检出率。以此开发的加工中心刀具破损监控系统，对1mm以上的钻头及3mm以上的铣刀破损检出率均在98％以上。

Enhanced control of DFIG-used back-to-back PWM VSC under unbalanced grid voltage conditions

This paper presents a unified positive-and negative-sequence dual-dq dynamic model of wind-turbine driven doubly-fed induction generator(DFIG) under unbalanced grid voltage conditions. Strategies for enhanced control and operation of a DFIG-used back-to-back(BTB) PWM voltage source converter(VSC) are proposed. The modified control design for the grid-side converter in the stationary αβ frames diminishes the amplitude of DC-link voltage ripples of twice the grid frequency,and the two proposed control targets for the rotor-side converter are alternatively achieved,which,as a result,improve the fault-ride through(FRT) capability of the DFIG based wind power generation systems during unbalanced network supply. A complete unbalanced control scheme with both grid-and rotor-side converters included is designed. Finally,simulation was carried out on a 1.5 MW wind-turbine driven DFIG system and the validity of the developed unified model and the feasibility of the proposed control strategies are all confirmed by the simulated results.

一种切换高压直流负载继电器设计方案

介绍了一种能够可靠切换混合动力汽车高电压、直流电机负载的继电器解决方案。

百龙滩水电站水轮机技术改造对电气设备影响探讨

百龙滩水电站1号水轮发电机进行定子改造,就此对受影响的电气设备进行了短路电流计算、发电机回路电容电流计算,重新进行有关参数复核。本文阐述了相关计算及分析过程,并作出改造方案推荐和探讨。