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首页> 外文期刊>Annals of "Dunarea de Jos" University of Galati, Fascicle III, Electrotechnics, Electronics, Automatic Control, Informatics >DC LINK CURRENT ESTIMATION IN WIND-DOUBLE FEED INDUCTION GENERATOR POWER CONDITIONING SYSTEM
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DC LINK CURRENT ESTIMATION IN WIND-DOUBLE FEED INDUCTION GENERATOR POWER CONDITIONING SYSTEM

机译：双馈感应发电机功率调节系统中的直流环节电流估计

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摘要

In this paper the implementation of the DC link current estimator in power conditioning system of the variable speed wind turbine is shown. The wind turbine is connected to double feed induction generator (DFIG). The variable electrical energy parameters delivered by DFIG are fitted with the electrical grid parameters through back-to-back power converter. The bidirectional AC-AC power converter covers a wide speed range from subsynchronous to supersynchronous speeds. The modern control of back-to-back power converter involves power balance concept, therefore its load power should be known in any instant. By using the power balance control, the DC link voltage variation at the load changes can be reduced. In this paper the load power is estimated from the dc link, indirectly, through a second order DC link current estimator. The load current estimator is based on the DC link voltage and on the dc link input current of the rotor side converter. This method presents certain advantages instead of using measured method, which requires a low pass filter: no time delay, the feed- forward current component has no ripple, no additional hardware, and more fast control response. Through the numerical simulation the performances of the proposed DC link output current estimator scheme are demonstrated.
机译：本文展示了直流链电流估计器在变速风力发电机功率调节系统中的实现。风力涡轮机连接到双馈感应发电机（DFIG）。 DFIG提供的可变电能参数通过背靠背功率转换器与电网参数相匹配。双向AC-AC电源转换器涵盖从次同步到超同步的广泛速度范围。背靠背功率转换器的现代控制涉及功率平衡的概念，因此其负载功率应在任何时刻都应知道。通过使用功率平衡控制，可以减小负载变化时的直流母线电压变化。在本文中，负载功率是通过直流链路间接地通过二阶直流链路电流估计器来估计的。负载电流估算器基于直流侧电压和转子侧变流器的直流侧输入电流。该方法具有某些优点，而不是使用需要低通滤波器的测量方法：没有时间延迟，前馈电流分量没有纹波，没有额外的硬件以及更快的控制响应。通过数值仿真，证明了所提出的直流母线输出电流估计器方案的性能。

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