Impedance Analysis and PHIL Demonstration of Reactive Power Oscillations in a Wind Power Plant Using a 4-MW Wind Turbine
Impedance Analysis and PHIL Demonstration of Reactive Power Oscillations in a Wind Power Plant Using a 4-MW Wind Turbine
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使用 4 MW 风力涡轮机的风力发电厂中无功功率振荡的阻抗分析和 PHIL 演示
DOI：
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发表时间：
2020
影响因子：
3.4
通讯作者：
A. Tiwari
中科院分区：
文献类型：
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作者：
Przemyslaw Koralewicz;Shahil Shah;V. Gevorgian;Robb Wallen;K. Jha;Dale Mashtare;Kasi Viswanadha Raju Gadiraju;A. Tiwari
本文介绍了基于阻抗的分析，缓解和功率硬件在环（PHIL）演示的无功功率振荡的风力发电厂使用4兆瓦的III型风力涡轮机传动系统。由于这种低频振荡是由调节相量的风力涡轮机的较慢控制回路（风力涡轮机的有功和无功功率输出以及互连点（POI）处的电压幅度）之间的相互作用引起的，因此根据相量定义了一种新类型的导纳以用于其分析。风力涡轮机的所谓功率域导纳被定义为从POI处的电压的频率和幅度到涡轮机的有功和无功功率输出的传递函数。利用7 MVA电网模拟器测量了4 MW风力涡轮机的功率域导纳响应，以识别无功功率振荡的来源。功率域阻抗分析和PHIL实验进行解释如何谐振模式表现为涡轮机到涡轮机和工厂到电网的无功功率振荡。据发现，较弱的电网表现出高感性阻抗减轻振荡的无功功率输出的风力发电厂，然而，较高的电网阻抗无助于阻尼涡轮机到涡轮机无功功率振荡。本文提出了一种简单的基于下垂的解决方案，以消除涡轮机到涡轮机和工厂到电网的无功功率振荡。
This paper presents impedance-based analysis, mitigation, and power-hardware-in-the-loop (PHIL) demonstration of reactive power oscillations in a wind power plant using a 4-MW Type III wind turbine drivetrain. Because such low-frequency oscillations result from interactions among slower control loops of wind turbines regulating phasor quantities—active and reactive power output of the wind turbine and the magnitude of voltages at the point of interconnection (POI)—a new type of admittance is defined in terms of phasor quantities for their analysis. The so-called power-domain admittance of a wind turbine is defined as the transfer function from the frequency and magnitude of voltages at the POI to the active and reactive power output of the turbine. The power-domain admittance responses of the 4-MW wind turbine are measured using a 7-MVA grid simulator to identify the source of the reactive power oscillations. Power-domain impedance analysis and PHIL experiments are performed to explain how a resonant mode manifests as turbine-to-turbine and plant-to-grid reactive power oscillations. It is discovered that weaker grids exhibiting high inductive impedance mitigate oscillations in the reactive power output of wind power plants; however, a higher grid impedance does not help in damping turbine-to-turbine reactive power oscillations. This paper presents a simple droop-based solution to eliminate both turbine-to-turbine and plant-to-grid reactive power oscillations.