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详细讨论了大型双速定桨矩风力发电机组大小发电机相互条件的确定、异步发电机软切入和风力发电机组大小电机相互切换技术,风力机组运行的若干问题。 相似文献
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大型风力发电机组动力学分析方法 总被引:2,自引:0,他引:2
本文提出了风轮叶片和塔架分别建模,应用模态综合技术分析风轮/架耦合系统动力学特性的方法。分析了孤立风轮叶片、塔架系统的振动特性与风轮/塔架耦合系统振动特性之间的变化,提出了在风轮叶片和塔架系统振动特性设计中应考虑的一些因素。 相似文献
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风力发电机组接入系统后,为保证机组输出的电压、功率稳定,采用了无功补偿、变桨距控制系统和异步发电机滑差调节控制联合工作的方法,并对风电场的防雷和接地进行了介绍。 相似文献
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Dejan Schreiber 《电源世界》2008,(12):27-30
单个IGBT摸块难以满足风力发电所需的大功率器件要求。本文阐述了采用串并联的方法提高耐压和扩大容量以满足风力发电机驱动器和大功率逆变器的要求,并对用于中压风力发电机驱动器和逆变器的IGBT摸块进行了分析,利用串并联IGBT摸块可得到更高的输出功率和效率。 相似文献
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针对大型发电机局部放电在线监测中存在的干扰问题,分析了监测现场各种干扰信号的特性,提出了采用自适应滤波算法来抑制干扰,介绍了自适应滤波器的组成,重点对自适应滤波算法进行了分析,并针对随机脉冲性干扰和周期性干扰进行了仿真试验。实验室的仿真表明自适应滤波算法能有效地抑制干扰和提取局部放电信号。 相似文献
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在离线的情况下模拟电机发生各种局部放电的状态,利用ICM monitor局部放电在线监测系统得到其放电量峰值和平均放电电流的直线棒图以及局部放电的特征图等,结合吉林白山发电厂在已运行了近10年的4号机组上安装ICM monitor局部放电在线监测系统及试验,通过多次实验所测得的第一手数据对发电机的绝缘状态进行了评定。 相似文献
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针对发电机原氢气湿度监测方法存在的问题,采用露点温度和绝对湿度联合监测的新方法,并选用先进的在线式温湿仪,解决了原监测方法的弊病,实现了发电机氢气湿度在线监测,可供电厂在发电机氢湿度监测改进时参考。 相似文献
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电网调度运行对掌握未来状态安全变化的迫切性越来越高,针对此问题,结合当前智能电网调度控制系统及其动态安全评估技术的发展,提出了运行方式安排的大电网在线趋势分析技术。该技术基于电网当前运行方式和在线稳定分析结论,利用调度操作调整、调度计划、新能源预报和负荷预测数据,形成电网未来时刻的预估潮流,在短周期内快速评估其安全状况及变化趋势,并给出辅助决策控制策略。该技术已在华中、黑龙江电网得到了应用,为复杂电网调度运行控制提供了预防预控的技术支撑手段,促进了电网控制从经验型向智能型的转化。 相似文献
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The capacity of distributed generators (DGs) connected to a grid by inverters is growing. The inverters are generally controlled by a phase locked loop (PLL) in order to achieve synchronization with the power system frequency. They cannot have synchronous power. Power systems become unstable if the capacity of the inverter‐type DGs is increased. The concept of controlling inverters to behave like a synchronous generator is studied in this paper. The result is referred to as a “virtual synchronous generator” (VSG). The VSG has synchronous power. Power systems become stable as a result of using the VSG. The VSG is useful in the parallel operation of DGs. The VSG can synchronize with other VSGs, synchronous generators, or the grid. In this paper, a method for the synchronous operation of a VSG is studied, and experimental results on a VSG running in parallel with a synchronous generator and other VSGs are presented. 相似文献
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Honbu Mitsuyuki Matsuda Yasuo Miyazaki Kouichi Jifuku Yorito 《Industry Applications, IEEE Transactions on》1983,(2):198-205
Techniques are presented for using a high-power GTO in a PWM inverter and operating inverter sets in parallel to increase the inverter equipment capacity. The high-power GTO has both a very large turn-off gate current and turn-on gate current for overdrive. It is best to employ an isolation pulse transformer for current amplification as the gate circuit. Also, the high-power GTO, which has a relatively small nonrepetitive controllable current compared with that of a medium- or low-power GTO, in principle can be protected effectively against short circuit faults using fuses. In parallel set operation, the inverter equipment has four typical behavior patterns which arise from differences in GTO switching characteristics. Of these, the behavior pattern in which the current balance is optimized is explained. In addition, the method for designing an interphase reactor as a current balancer and the combination region of GTO characteristics have been given. By means of a parallel set operation test, it has been confirmed that a current unbalance can be suppressed to below ten percent of the peak load current. 相似文献