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题名	电网电压跌落下网侧变流器的运行特性及STATCOM运行模式分析; 电网电压跌落下网侧变流器的运行特性及STATCOM运行模式分析
作者	1孔德国,电工研究所
学位类别	硕士
答辩日期	2009-06-04
授予单位	中国科学院电工研究所
导师	1赵斌,电工研究所
关键词	网侧变流器 STATCOM运行模式 电压跌落发生器 PMSG grid-side converter STATCOM operating mode voltage dip generator PMSG
其他题名	电网电压跌落下网侧变流器的运行特性及STATCOM运行模式分析
中文摘要	随着风电产业的迅速发展，风力发电相关技术也得到了极大的进步，风力发电规模和集成化的发展趋势也对风力发电机组提出了更高的要求，在电网发生故障的情况下，不能随意的脱离电网，必须具备较强的低电压穿越能力。而双PWM变流器作为风力发电机组中最重要的功率器件之一，承担着能量交换的重要功能，其中网侧变流器直接与电网相连接，更能直接感受到电网电压的变化情况，因此研究网侧变流器在电网电压跌落下的运行特性对于提高机组的低电压穿越能力具有重要的意义。文章中介绍了网侧变流器在正常以及在电网电压跌落下运行时的模型，并且通过相关的仿真和实验波形，指出了一些物理量的变化情况，提出了电网电压跌落下需要改进的物理量；文中还介绍了一种新型的基于面积矢量AAV的调制方法，该方法不仅能够达到传统调制方法的效果，而且计算简单，易于实现，文中对该算法进行了仿真，得出了相关的结论。 其次，提出了网侧变流器的STATCOM运行模式，通过该软件运行方式能够有效的提高机组的低电压穿越能力。文中介绍了STATCOM作为静止无功补偿器时的运行原理及控制方法，并且将该种控制模式与变流器常规双闭环控制策略相结合，灵活控制电流内环的无功电流参考设定值，这样就可以实现无功功率的灵活，快速的补偿，从而在一定程度上抑制电网电压的跌落；STATCOM运行模式仅能在一定的跌落幅值和时间内实现机组的低电压穿越能力，当电网电压的跌落幅值过大或者持续时间过长时，就超出了STATCOM运行模式控制的范围，必须采用硬件电路，文章中以直驱风力发电系统为例，采用直流侧卸荷电路，能大大提高机组的低电压穿越能力。 最后介绍了几种电压跌落发生器(VSG)的原理，即通过相关的仿真和实验证明基于变压器和由IGBT组成双向开关的VSG效果最佳；并且参与搭建了永磁直驱双馈式风力发电机组((PMSG))实验平台，在该平台上验证了网侧变流器在永磁直驱风力发电机组运行在不同转速时的有功，无功和直流侧电压的变化情况，得出了一些结论。 With the rapid development of the wind power industry, wind power technology has been greatly progressed, that will be higher demand on the development trend of the scale and the integrated of wind turbine. When the power grid appears failure, wind turbine can not be disconnected from the grid and must have a strong capacity of low-voltage ride-though. And as one most important power device, dual-PWM converter in wind turbine assume the important function of the energy exchange, in which grid-side converter is connected directly with the grid, and more, grid-side converter can directly sense of the changes in voltage, Therefore, research about the operating characteristics of grid-side converter on the condition of voltage drop can greatly improve the capacity of low-voltage ride-though. The dissertation introduces the grid-side converter model in the normal and low-voltage operation, gets relevant simulation and experimental waveforms, notes a number of changes about physical data, and puts forward improved physical data that needs on the conditions of voltage drop; It also introduces one new modulation method based Area vectors called AAV. the method not only has the same effect as conventional modulation method, but also has more simple calculation to implement, and according to the simulation on the algorithm, the relevant conclusions can be obtained in the dissertation. Secondly, the STATCOM operating mode of the grid-side converter has been put forward, such software mode improves the capacity of low-voltage ride-though effectively. In this dissertation, the operating principles and control methods of STATCOM as SVC are introduced, and the operating mode about the cooperation between STATCOM and the conventional double-loop control strategy controls reactive current reference value of the inner current control. Then, reactive power can be achieved in a flexible, rapid compensation, which inhibits the voltage-drop in a certain extent; the STATCOM operating mode achieve the low-voltage ride-though capacity in a certain amplitude and time of voltage-drop, when the drop amplitude of grid voltage is larger or the time is longer duration, then, it goes beyond the STATCOM operating mode control, the hardware circuit must be necessary, in the article, as an example of the direct-drive wind power generation system, the DC unloading circuit can greatly improve the capacity of low-voltage ride-though. Finally, the principles about a number of voltage dip generator (VSG) are introduced, through relevant simulation and experiment, it proves that the VSG based on the transformer and IGBT switch composed by double-way switch has the best effect; and then a permanent magnet direct-drive double-fed wind turbine experimental platform is build. On the platform, the changes of active, reactive power and DC voltage about grid-side converter can be obtained when the permanent direct-drive magnet wind turbine (PMSG) runs at different speed.
语种	中文
公开日期	2010-10-18
页码	81
分类号	TM1;TM921
内容类型	学位论文
源URL	[http://ir.iee.ac.cn/handle/311042/7141]
专题	电工研究所_其他部门_其他部门_硕士学位论文
推荐引用方式 GB/T 7714	1孔德国,电工研究所. 电网电压跌落下网侧变流器的运行特性及STATCOM运行模式分析, 电网电压跌落下网侧变流器的运行特性及STATCOM运行模式分析[D]. 中国科学院电工研究所. 2009.

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