24脉波整流器外特性仿真及其在城市轨道交通中的应用

建立了24脉波整流器的电路模型,分析了其多区段外特性,并将其外特性曲线应用到城市轨道交通供电仿真软件中.仿真和试验表明,该仿真建模计算精确度高,工程实用性强.     

TGA18型内燃机车水冷主变流器的研制

介绍了TGA18型大功率内燃机车水冷主变流器的主电路、电气技术参数及总体结构,重点分析了该型变流器的器件选型及水冷系统的结构特点.通过实际装车考核,表明该型主变流器运行稳定,满足大功率交流传动内燃机车的运用要求.     

50 kW发电机自动电压调节器

主要描述了50kW中频无刷同步发电机自动调节电压的基本原理和主要参数以及调整方法。     

取力发电机组检测装置的设计

提出了一种基于工控机的取力发电机组检测装置,该系统具有自动和手动两种操作方式,由工控机、多功能卡、串行通讯卡、各种传感器及电气设备组成,采用无刷直流电机作为驱动电机,软件采用Windows XP操作系统和LabView开发,可实时检测机组的电压、电流、功率及转速、扭矩、轴功率等参数等,测量结果直观、迅速、可靠性高,极大提高了维修后测试的效率。     

威志轿车安全气囊气体发生器国产化可行性分析

为保证威志轿车安全气囊安全供货,避免进口气体发生器由于供货风险造成停产,对气体发生器进行国产化势在必行。文章对国内气体发生器的各项性能指标进行检测,以及台车优化试验、模块DV试验及气体发生器时间一压力试验。结果表明,国内生产的气体发生器的各项指标完全满足设计要求。道路碰撞试验表明,安全气囊气体发生器国产化可行。     

Study of predicting breakdown voltage of stator insulation in generator based on BP neural network

The breakdown voltage plays an important role in evaluating residual life of stator insulation in generator. In this paper, we discussed BP neural network that was used to predict the breakdown voltage of stator insulation in generator of 300 MW/18 kV. At first the neural network has been trained by the samples that include the varieties of dielectric loss factor tan δ, the partial discharge parameters and breakdown voltage. Then we tried to predict the breakdown voltage of samples and stator insulations subjected to multi-stress aging by the trained neural network. We found that it＇s feasible and accurate to predict the voltage. This method can be applied to predict breakdown voltage of other generators which have the same insulation structure and material.     

家用太阳能发电系统逆变电路的设计

采用运算放大器组成的RC桥式正弦波振荡器电路和运算放大器,设计了一种家用太阳能发电系统逆变电路,该电路可以将光伏蓄电池阵列的直流输出电压转变为工频50HZ、220V的交流电压,电路具有体积小、重量轻、成本低的特点,并经计算机模拟仿真实验,从理论上验证了电路的合理性。     

Torque distribution strategy for integrated starter/ generator hybrid bus implemented by fuzzy algorithm

A torque distribution strategy was designed by using fuzzy logic to realize the optimal control. Thevehicle load zones were dynamically divided into several zones by several torque lines to indicate the driversdemand and the high or low efficient operating areas of the diesel engine. The fuzzy logic controller withtrapezoid membership function and Mamdani rule reference mechanism was utilized. There are over 100 rulesused in this fuzzy-based torque distribution strategy which are sorted into four rule-bases. The fuel economyand acceleration tests were designed to test and validate the integrated starter/generator (ISG) bus perfor-mance using fuzzy-based torque distribution strategy. The fuel economy is improved 7.7% compared with therule-based strategy. Finally the road test results reveal that there is about 157% improvement of fuel economy.And the 0-50 km/h acceleration time is 9.5% shorter than the original bus.     

起重铺管驳船电站系统设计

文章阐述了某1600吨起重铺管驳船的主要性能和特点,介绍了电站设计时的电力设备分类、船舶运行工况、铺管工况和吊装工况下主要设备需要系数的取值,并根据计算确定了电站主发电机、应急发电机及电力变压器的相关参数,具有一定的应用价值。     

基于双闭环控制的三相PWM整流充电技术研究

随着环境污染和资源短缺问题日趋严重,电动汽车的研究备受人们的关注。而研究电动汽车中蓄电池充电装置及充电技术对于推动电动汽车产业发展具有一定的意义。传统的充电装置通常采用三相不可控整流器和DC-DC变换器组成,此类充电装置使得网侧谐波电流大且变换效率低。本文采用双闭环控制的三相PWM（脉宽调制）整流器作为充电装置,其中电流内环可提高网侧功率因素,电压外环可稳定输出的直流电压。为缩短蓄电池充电时间,电压外环参考电压设置为蓄电池浮充电压,使得充电电流的变化符合其充电接收曲线。最后在MATLAB／SIMULINK中搭建仿真模型,验证该控制策略的可行性。