双绕组无刷励磁同步发电机效率分析计算与试验

针对国产交流传动内燃机车用双绕组无刷励磁同步发电机的效率问题,提出效率计算方法和试验方案,并对计算结果和试验结果进行了比较、证明是可行的。     

无刷双馈风力发电机的理论分析

介绍了无刷双馈发电机的结构和变速恒频发电原理。从电机稳态模型出发,分析了无刷双馈电机作为变速恒频发电机在各种不同转速范围内各定、转子间的能量传递关系,得出了无刷双馈电机适用于风力发电的结论。     

330 MW发电机无刷励磁系统运行分析

从运行人员的角度出发,紧密结合现场实际,论述了蒲电二期汽轮发电机组无刷励磁系统及其附属系统的工作原理。分析比较了发电机无刷励磁系统与传统励磁系统,结果表明,发电机无刷励磁系统运行可靠性高,技术和经济性能优越。提出了蒲电二期发电机自并励励磁系统在设计方面存在的问题：监测旋转二极管运行情况的霍尔效应传感器易发生故障;发电机的励磁电流、励磁电压难以监视等。     

新型简单凸极转子双定子无刷双馈发电机的设计与分析

近年来无刷双馈发电机由于其结构简单、可靠性高、变频器容量低等优点在风力发电领域受到广泛关注.为提高电机空间利用率和功率密度,提出一种新型简单凸极转子无刷双馈发电机,它将两套绕组分离,功率绕组PW置于外定子,控制绕组CW置于内定子.内外定子之间为杯型转子,由简单凸极和不导磁块交替排布而成.PW和CW依据气隙磁场调制原理通...     

无刷双馈风力发电机滑模功率解耦控制

首次采用现代控制理论中的滑模变结构方法研究了无刷双馈发电机(BDFM)运行时有功功率与无功功率的解耦控制,在状态方程的基础上,应用Lyapunov函数求得了有功功率与无功功率的滑模控制律,并在Matlab/Simu-link基础上建立了系统的仿真模型。仿真结果表明,滑模变结构控制能够有效的实现有功功率与无功功率的解耦控制,并实现了风能的最大功率捕获,证明了该控制策略的有效性。     

无刷直流电机变频调速系统及在水泵节能中的应用

研究了一种基于DSP的水泵数字调速系统,采用无刷直流电机作为水泵驱动电机,以TI公司的数字信号处理器TMS320 F2812作为主控芯片,在硬件上设计了整流逆变电路、驱动及保护电路等;通过软件编程,实现转子位置信号的读取、PWM波的产生、电流调节等功能。该系统具有结构简单、可靠性高、扩展能力强等特点;可有效地实现水泵调速功能,达到节能运行的目的。     

变速恒频无刷双馈风力发电机的建模与仿真

建立了包括风速、风力机和风力机机械控制部分、变速恒频无刷双馈风力发电机的整体动态数学模型：应用MATLAB软件中的SIMULINK环境,以建立的数学模型为基础搭建了变速恒频无刷双馈风电机组仿真模型。以渐进风和随机风为例．对仿真模型进行分析。仿真结果表明了变速恒频尤刷双馈风力发电机良好的运行特性及模型的正确性,并为无刷双馈电机在风力发电系统的进一步应用研究提供了可靠的理论依据。     

无刷双馈风力发电机的自抗扰解耦控制

针对无刷双馈电机(BDFM)结构的复杂性、随环境的可改变性及传统的PID控制在BDFM中应用不理想等,提出了一种新型基于扩张观测器的非线性PID控制——自抗扰控制方法来实现对风力发电系统有功功率和无功功率的解耦控制。仿真结果证明了该方法的正确性和有效性,具有更强的鲁棒性和可实现性。     

ALA转子无刷双馈风力发电机的参数计算方法与转子制造工艺探讨

在大型变速恒频风电系统中采用新型无刷双馈发电机，既运行可靠又可降低所需控制系统的容量和成本。该文介绍了该种风电系统的组成和新型无刷双馈发电机结构；提出了各向异性轴向叠片（ALA）转子无刷双馈发电机电感参数的准确计算方法；研究了主要设计尺寸对电机耦合能力的影响；对该种电机转子的制造工艺进行了探讨。研究表明，该文提出的电感参数叠加法较好的解决了该种发电机的参数计算问题；在无刷双馈发电机的设计中，应兼顾考虑主要设计尺寸的综合影响，以得到最佳的设计方案。     

多级变速风力发电技术

提出了一种新的风力发电技术.该技术是处于“恒速恒频”和“变速恒频”之间,风力机可以在几个叶轮转速点输出频率恒定的电能,相对恒速恒频风力机只在一个转速点输出所要求的恒定频率电能有较大的进步.该技术的风能利用率相对较高、经济实用、简单可靠.     

Loss of synchronism process of a synchronous generator described byits internal flux and force distributions

The authors report on the loss of synchronism process of a synchronous generator in an electric power system. The process is described in terms of the magnetic flux and force distributions inside the machine. Data on the field and armature currents used as input to the flux and force calculation by the finite element method were obtained from experiments on a machine connected to an infinite-bus system. By examining the transition of flux and force distributions during the loss of synchronism process, a physical picture of the process is given     

21世纪的新能源—风能

风能是一种可再生的洁净能源 ,也是 2 1世纪的新能源之一。风能资源丰富 ,开发潜力很大 ,大力开发风能是解决传统能源危机和环境污染问题的重要手段。1　人类利用风能历史悠久风作为一种最古老的能源和动力 ,人类运用它已有数千年的历史。据文献记载 ,古埃及人在 2 80 0年前就用风帆行舟 ,后来又以风力协助役畜来磨谷、提水。作为文明古国的中国 ,使用风帆船亦有二三千年的历史。最辉煌的风帆时期是明代 ,航海家郑和率领庞大的风帆船队七下西洋 ,成为千古佳话。 10 0 0多年前 ,我国还最先发明风车并传入中东 ,12世纪从中东传入欧洲。 16世纪…     

新能源应用技术促进保定的节能减排

建设低碳城市,新能源产业是重要基础。叙述了保定依托中国电谷的发展在新能源应用方面具有的优越条件以及新能源技术在保定节能减排方面应用的具体效果,指出,新能源技术是低能耗、低排放、低污染的经济发展模式。保定在推动节能减排与低碳经济发展方面不仅具有自身特色,还具有深远意义。     

新能源应用技术促进保定的节能减排

建设低碳城市,新能源产业是重要基础。叙述了保定依托中国电谷的发展在新能源应用方面具有的优越条件以及新能源技术在保定节能减排方面应用的具体效果,指出,新能源技术是低能耗、低排放、低污染的经济发展模式。保定在推动节能减排与低碳经济发展方面不仅具有自身特色,还具有深远意义。     

一种带回热的新型节能燃气灶的研究

提出一种带回热的新型节能燃气灶,即采用回热循环来提高燃气灶的热效率.利用燃烧后排走的高温烟气加热助燃空气.一方面提高了助燃空气的温度使燃烧效率得到提高;另一方面回收了烟气的热量提高了总的热效率,并且改变了传统的上抽油烟方式为下抽油烟,使厨房环境得到明显改善.理论计算表明在考虑上部进风20%的情况下热回收率为6.07%,相对热回收率为20.25%,热效率可提高4.25%.本文给出了燃气灶热力计算的基本流程,希望会对节能燃气灶的设计提供参考.     

Efficiency of three wind energy generator systems

This paper presents a method to calculate the average efficiency from the turbine shaft to the grid in wind energy converters. The average efficiency of three 500 kW systems are compared. The systems are: a conventional grid-connected four-pole induction generator equipped with a gear, a variable-speed synchronous generator equipped with a gear and a frequency converter, and a directly driven variable-speed generator equipped with a frequency converter. In this paper it is shown that a variable-speed generator system can be almost as efficient as one for constant speed, although it has much higher losses at rated load. The increased turbine efficiency that variable speed leads to has not been included in this paper. It is also found that a directly driven generator can be more efficient than a conventional four-pole generator equipped with a gear     

A thermal cycling type test for generator stator winding insulation

A test has been designed and implemented which cycles the temperature between 40°C and 150°C in about 80 min by the use of circulating currents and cooling air. The test has been successfully used to evaluate the relative performance of similar stator bars made by three different manufacturers. The thermal cycling test was able to duplicate the insulation delamination process and presumably those insulation systems which performed well in the thermal cycling test could last longer in service. In addition to being used for pumped-storage generators, the thermal cycling test may be useful to evaluate the insulation system in combustion turbine generators     

A six-phase synchronous generator for stand-alone renewable energy generation: Experimental analysis

This paper presents the steady-state behavior of a SPSG (six-phase synchronous generator) configured to operate as a stand-alone electric energy source in conjunction with a hydro power plant. A purely experimental treatment is provided with the emphasis placed on operating regimes that illustrate the advantages of using SPSG. In particular, it is shown that the generator can supply two separate three-phase loads which represent an additional advantage. Last but not least, outputs of the two three-phase windings can be used to supply a single three-phase load through an interconnecting six-phase to three-phase transformer, in which case failure of one three-phase winding does not lead to the system shutdown and the load can be still supplied from the remaining healthy winding. Experimental results include loading transients with independent three-phase resistive load at each of the two three-phase winding sets, and measured steady-state characteristics for various configurations and operating conditions.     

Novel ocean energy permanent magnet linear generator buoy

This paper describes the research, design, construction and prototype testing process of a novel ocean energy direct drive permanent magnet linear generator buoy. The buoy employs the vertical component of the motion of ocean waves to power a linear generator. The generator consists of a permanent magnet field system (mounted on the central translator shaft) and an armature, in which the power is generated (mounted on the buoy). The translator shaft is anchored to the sea floor, and the buoy/floater moves armature coils relative to the permanent magnet translator to induce voltages. The electrical and mechanical structures of the buoy generator are provided, along with performance characteristics, including voltage, current and developed power.