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首页> 外文期刊>IEEE Transactions on Energy Conversion >Turbine, generator, system modeling and impact of variable-frequency ripple currents on torsional stressing of generators in Poland and Sweden: Lithuania/Poland and Sweden/Poland HVDC links
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Turbine, generator, system modeling and impact of variable-frequency ripple currents on torsional stressing of generators in Poland and Sweden: Lithuania/Poland and Sweden/Poland HVDC links

机译：波兰和瑞典的涡轮机，发电机，系统建模以及变频纹波电流对发电机扭转应力的影响：立陶宛/波兰和瑞典/波兰HVDC链接

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摘要

This paper analyzes rectifier ripple current superimposed on the direct current of a 600 MW asynchronous bipolar link between Lithuania and Poland and a 600 MW asynchronous monopolar link between Poland and Sweden in evaluating possible torsional vibrations in steam turbine-generator-exciter shafts. The studies are performed for machines in Northeastern Poland and in Southern Sweden close to the inverter station which are most at risk. Analyses are performed for the generators in Poland for the Lithuania/Poland link and for the generators in Sweden for the Poland/Sweden link. The paper examines system scaling factors for the Lithuania/Poland Link. It then examines AC system scaling factors and generator scaling factors for modulation product harmonic currents impressed on generators connected to the Swedish Grid Network by the inverter. Amplitude of shaft torsional torque due to resonant excitation imposed by the link on the generators in Sweden is evaluated for different scenarios of system and generator load. First, theory which relates magnitude of harmonic AC current injected into the AC system by the inverter is summarized. Dispersion of the injected harmonic AC current to proportion the current to individual generators is then reviewed, considering impedance of the generators, loads, and other system elements. Significance of simple and detailed shaft train models of machine shafts as well as approximate (Id, Iq) and detailed (2d, 3q) generator damper models on resonant torques is reviewed. Then, effects of both power factor and generator load on generator scaling factors is illustrated.
机译：本文分析了叠加在立陶宛和波兰之间的600 MW异步双极链节以及波兰和瑞典之间的600 MW异步单极链节的直流整流器上的整流器纹波电流，以评估蒸汽轮机-发电机-激励器轴中可能的扭转振动。这项研究是针对波兰东北部和瑞典南部靠近逆变器站且风险最大的机器进行的。对立陶宛/波兰链接的波兰发电机和瑞典/波兰/瑞典链接的发电机进行分析。本文研究了立陶宛/波兰链接的系统比例因子。然后，它检查交流系统的比例因子和发电机的比例因子，以了解通过逆变器施加在连接到瑞典电网的发电机上的调制产物谐波电流。针对系统和发电机负载的不同情况，评估了瑞典链路上由于发电机施加的共振激励而引起的轴扭转扭矩的幅值。首先，总结了与逆变器注入交流系统的谐波交流电流的大小有关的理论。然后，在考虑到发电机，负载和其他系统元件的阻抗的情况下，检查注入的交流谐波电流的色散，以与流向各个发电机的电流成比例。回顾了简单而详细的机器轴的轴系模型以及近似（Id，Iq）和详细（2d，3q）发电机阻尼器模型对共振转矩的意义。然后，说明了功率因数和发电机负载对发电机比例系数的影响。

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