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金炫 《上海电机厂科技情报》2000,(3):19-23
本文简略介绍了由交-直-交负载换相逆变器(LCI)供电的交流调速同步电动机设计的特点,着重叙述谐波的抑制、电磁负荷的选取、阻尼绕组及电抗参数的确定等内容。 相似文献
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通过建立带阻尼绕组的大功率交-交变频凸极同步电动机的多回路数学模型,研究了在负载突然变化,不同阻尼绕组构、导条根数、阻尼节距时,电动机的功能振荡、阻尼绕组瞬态电流、损耗等情况。结果表明:大功率交-交变频凸极同步电动机应设置成全阻尼绕组,且在极面上阻尼条靠近d轴布置比阻尼条均匀布置要好,电机实际运行情况验证了结论的正确性。 相似文献
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用数值积分方法求出了无换向器电机交-交系统稳态运行时同步电动机定子绕组、励磁绕组和阻尼绕组电流波形,并对其谐波问题进行了研究。并作了实例计算。 相似文献
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讨论了采用电力电子仿真软件SABER建立同步电机交-交变频调速系统的模型与仿真方法。分析了系统在不同工作频率下的运行特性,对交-交变频器输入电流及输出电压输出电流进行了谐波分析。指出了输出频率、死区等对交-交变频器的影响。仿真结果表明,基于SABER的同步电机交-交变频调速系统模型是正确的,反映了电路实际工作情况,概念清晰,为后续研究打下了良好的基础。 相似文献
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本文研究了由变频器非线性引起的交-交变频器供电的大功率同步电动机系统的谐波问题。重点对稳态运行条件下由定子谐波电压产生的磁势引起的阻尼绕组谐波电流、谐波损耗及脉动转矩进行了计算分析,并以一台5000kW交-交变频大功率同步电动机为例做了实例计算。 相似文献
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在直接由三相正弦电网供电的同步电动机中,阻尼绕组的主要作用有消弱非对称运行而引起的谐波电流、衰减转子的自由振荡和产生异步起动转矩。这些作用在变频调速系统中基本是多余的。那么在这类系统中有否设置阻尼绕组的必要呢?本文分别就电流型和电压型变频调速系统对此作了分析,为这类系统中阻尼绕组的设计提供了根据。 相似文献
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《Electric Power Systems Research》1996,36(3):211-216
This paper deals with a simple mathematical model for steady-state analysis of a self-controlled synchronous motor in terms of d,q variables. The flux linkage of the damper winding is considered constant under steady-state conditions. With the input voltage to the synchronous motor and the machine equations in d,q form, torque-current and speed-current relations are developed. The computed results are given and discussed in detail for a 3 kVA, three-phase, 400 V, four-pole, inverter fed synchronous motor and it is shown that this system has the same characteristics as a conventional DC motor. 相似文献
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同步电机异步起动过程的分析计算 总被引:4,自引:2,他引:4
为了模拟同步电机的准稳异步起动过程,本文考虑起动绕组的具体分布,建立了凸极同步电机稳态异步运行情况下的数学模型,并参考文献(1)建立了瞬态起动过程的计算模型。以一台680kVA同步电机为例,以准稳态异步起动过程和不同条件下的瞬态起动过程进行了计算分析,得出了一些对实际工程有一定意义的结论。 相似文献
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《Education, IEEE Transactions on》1967,10(4):245-248
This paper draws attention to the considerable similarity that exists in electrical machines when operating in the transient mode. An analysis is made of a salient pole synchronous machine, which has a damper winding. Using these equations it is possible to deduce the equations of other types of machines. In this way the similarities are highlighted. 相似文献
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Esmat H. Badawy 《Electric Power Systems Research》1984,8(1):1-7
The performance of a salient pole synchronous generator connected to a bridge rectifier load is derived from the fundamental machine equations. The generator is fitted with both direct- and quadrature-axis damper windings, and the bridge rectifier load is fully controlled. Explicit equations are obtained for displacement angle, commutation angle, phase voltages, armature currents, field current and damper winding currents. From these equations, the performance of generators with and without damper windings, connected to controlled or uncontrolled bridge rectifier loads can be predicted from given load current, field current, generator speed, bridge delay angle and machine parameters. Comparative experimental and theoretical results are given. 相似文献
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Since an adjustable-speed generator/motor (ASGM) is excited by ac voltage fed by a quick-response cyclo-converter, rotating speed of the rotor can be constantly changed. The ASGMs installed at some pumped-storage power stations achieve automatic frequency control during nightly demand troughs by changing the pumping power to accord with the rotating speed. It is expected, on the other hand, that under peak generation during the day, the ASGM will be used for enhancement of transient stability because it can generate or absorb active and reactive power independently via the ac excitation voltage control. This paper proposes a novel control method for the excitations systems of ASGM that will improve the transient stability of multi-machine power systems like multiple ASGMs. The controller, which is designed for an energy function, works well for stability enhancement. To gauge it against conventional excitation control of synchronous generators and against constant output power control of ASGMs, the effectiveness of the proposed method is simulated in digital trials. © 1997 Scripta Technica, Inc. Electr Eng Jpn, 118 (4): 10–19, 1997 相似文献