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基于虚拟仪器的航空逆变电源输出特性测量研究 总被引:8,自引:2,他引:6
航空逆变电源是利用电力电子技术,将直流电转换为交流电的设备。飞机上的逆变器是时控组件,需要定时检测,其各项输出指标必须符合ISO1540国际标准要求。本文提出了基于虚拟仪器技术的航空逆变电源输出特性测试系统,阐述了系统的硬件组成及其软件功能模块,并对基于离散傅里叶变换的测量数学模型进行了分析。该测试系统能够实时检测航空逆变电源的电压、频率、波峰系数、波形失真度、相位差等参数。通过对机载和地面逆变电源的测试,结果表明该系统能够实现对逆变电源输出特性的精确测量。该测试系统不仅可以满足民航维修相关测试的需求,而且对开发国内大飞机机载和地面逆变电源的检测平台具有一定的现实意义。 相似文献
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介绍了等离子辅助球磨加工的基本原理,给出了等离子辅助球磨逆变电源控制电路,并采用PIC单片机作控制器,MAX724、AD7543等器件实现了输出功率可调节的电路,该电路工作稳定,满足辅助球磨逆变电源的要求. 相似文献
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针对传统电焊机的交流电压的频率为电网频率50Hz的工作特点,其工作效率低,焊接效果差,耗电多等缺点.本文设计了焊接逆变电源的数字控制,通过数字控制实现电焊机逆变电源输出交流电压的频率,其实现方法是通过改变单相逆变器SPWM的调制波的频率,从而改变输出交流电压的频率.通过理论分析和DSP数字控制实验验证了该控制系统的稳定性和可靠性,并能适时的改变逆变电源输出交流电压的频率,该方法能提高焊接的效率、降低能源,提高焊接质量. 相似文献
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针对逆变电源模糊控制系统输出存在振荡的问题,以数字信号处理器(DSP)为核心,将可变论域思想引入模糊自整定PID控制结构中,提出一种基于可变论域的模糊自整定PI双闭环逆变电源控制器,实现了在线调整模糊论域的伸缩变化.仿真结果表明,阻性负载情况下,与常规PID控制器相比该控制器输出超调小、自适应能力强,提高了逆变电源系统... 相似文献
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设计了一种基于80C196KB单片机的模糊控制PWM开关稳压电源,以提高稳压精度。模糊控制器采用离线计算、在线查询决策表的方法实现,易于工程实现。在Matlab powersystem-simulink环境下构造了开关电源模糊控制仿真模型,并对其性能进行了仿真研究。 相似文献
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通过对原有感应加热电源温度控制方法的分析,提出了一种适合于非线性系统基于模糊神经网络的温度控制方法。与传统的控制策略相比,模糊神经网络控制具有不依赖控制对象精确的数学模型,较强的鲁棒性,控制方式简便等优点。实验证明:该加热方法优于常规PID和模糊PID,可获得良好的动态特性,具有稳态精度高,功率调节范围宽,工作稳定可靠的优点。 相似文献
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传统的PID控制在对象发生变化时,控制器的参数难以自动调整.该文将模糊控制算法与PID控制技术相结合应用到多电机同步控制系统中,通过模糊控制算法在线调整PID参数.此控制系统在中山市天乙铜业热轧项目上使用,运行结果表明该方法能够大大改善系统的动态特性,提高了系统的稳定性. 相似文献
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大型矿山开采供电方案的设计 总被引:2,自引:0,他引:2
赵华军 《机电产品开发与创新》2010,23(2):27-28
分析了矿山供电方案设计的技术要求与控制功能要求,根据项目用电负荷的实际,对矿石开采项目的供电方案进行了设计。该设计方案具有设备技术先进,运行可靠性高,预制模块化设计、占地面积小等特点。 相似文献
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Nowadays power consumption is increasing day-by-day. To fulfill failure free power requirement, planning and implementation of an effective and reliable power management system is essential. Phasor measurement unit(PMU) is one of the key device in wide area measurement and control systems. The reliable performance of PMU assures failure free power supply for any power system. So, the purpose of the present study is to analyse the reliability of a PMU used for controllability and observability of power systems utilizing available uncertain data. In this paper, a generalized fuzzy lambda-tau (GFLT) technique has been proposed for this purpose. In GFLT, system components' uncertain failure and repair rates are fuzzified using fuzzy numbers having different shapes such as triangular, normal, cauchy, sharp gamma and trapezoidal. To select a suitable fuzzy number for quantifying data uncertainty, system experts' opinion have been considered. The GFLT technique applies fault tree, lambda-tau method, fuzzified data using different membership functions, alpha-cut based fuzzy arithmetic operations to compute some important reliability indices. Furthermore, in this study ranking of critical components of the system using RAM-Index and sensitivity analysis have also been performed. The developed technique may be helpful to improve system performance significantly and can be applied to analyse fuzzy reliability of other engineering systems. 相似文献
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根据火电厂供氢系统的工作流程及特点,为了提高自动化控制水平,该文提出了一种基于PLC+触摸屏的供氢系统自动控制方法。详细论述了系统的工艺流程及主要功能的设计及实现方法。目前该系统已应用于波黑斯坦纳瑞(STANARI)1×300 MW燃煤电站项目上,经过现场测试,系统运行良好,安全可靠。 相似文献
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阐述了三靶真空镀膜机靶电源模糊控制系统,介绍了该系统的控制策略,由PLC的程序;现靶电流闭环模糊控制的硬件电路和相应的工艺运行程序,获得稳定的靶电流情况。 相似文献
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针对负荷频率控制的非线性、参数的不确定和纯迟延特性等问题,结合模糊控制技术和神经网络控制技术的优点,提出一种神经网络自组织模糊控制算法.该算法应用于电力系统频率控制中的仿真研究表明,该控制方案表现出良好的控制品质并能适应被控对象参数的变化,提高了系统稳态精度和动态性能. 相似文献
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Morteza Bagherpour Abalfazl Zareei Siamak Noori Mehdi Heydari 《The International Journal of Advanced Manufacturing Technology》2010,49(5-8):419-429
Earned value analysis is a project performance method which simultaneously presents both cost and schedule performances. The purpose of this paper is to model the uncertainty associated with activity duration in earned value analysis. The approach incorporates to design a control mechanism, which would be applicable through production control as well as project management problems. The job processing times have been considered as triangular fuzzy number. Costs are assumed to be directly related to fuzzy activity time, which are estimated through a bottom up hierarchy process. Consequently, different earned value metrics have been achieved. Research findings provide an efficient control mechanism in earned value analysis, which would be highly applicable in production control area. This research also yields a novel approach for representing a production performance index during implementation of production processes. In addition to the above mentioned issues, forecasting features can be further performed for predicting completion time of products for delivery to the customer. The approach presented in this paper has been successfully implemented through a multi-period–multi-product production planning problems, which efficiently demonstrates the applicability of the proposed control mechanism. 相似文献