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首页> 外文期刊>Power Electronics, IET >Capacitor impedance estimation utilizing dc-link voltage oscillations in single phase inverter
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Capacitor impedance estimation utilizing dc-link voltage oscillations in single phase inverter

机译：利用单相逆变器中直流环节电压振荡的电容​​器阻抗估算

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摘要

Grid tied single-phase solar inverters offer less operational life when compared with the Photovoltaic (PV) panels due to the use of aluminium electrolytic capacitor (AEC). With time, AEC degrades, resulting in an increase in ripple voltage on PV panel. This would reduce the power extraction efficiency of the system, thereby a loss of revenue. This study proposes a simple and cost-efficient online technique for monitoring the health of AECs. The proposed technique suggests evaluating the AEC impedance at twice the grid frequency. Sampling of PV voltage, PV current and inductor current is required to determine the second harmonic impedance of AEC. These voltage and current sensors are present in commercially available solar PV inverters for their control operation. The proposed technique could be extended to other single-phase inverter applications provided that voltage and current sensors are available. Suitable mathematical model of the technique is derived to determine the effect of sampling instant on the accuracy of the results. Criteria for the replacement of capacitor based on impedance monitoring is defined. For validation of the proposed technique, detailed simulation studies are carried out for a single-phase PV system. The technique is verified experimentally on a scaled down solar PV inverter prototype.
机译：由于使用了铝电解电容器（AEC），与光伏（PV）面板相比，并网单相太阳能逆变器的使用寿命更长。随着时间的推移，AEC会降低，从而导致PV面板上的纹波电压增加。这将降低系统的功率提取效率，从而损失收入。这项研究提出了一种简单且经济高效的在线技术来监测AEC的健康状况。提出的技术建议以两倍于电网频率的频率评估AEC阻抗。需要对PV电压，PV电流和电感器电流进行采样以确定AEC的二次谐波阻抗。这些电压和电流传感器存在于商用太阳能光伏逆变器中，以进行控制操作。只要电压和电流传感器可用，建议的技术可以扩展到其他单相逆变器应用。推导了该技术的合适数学模型，以确定采样瞬间对结果准确性的影响。定义了基于阻抗监控的电容器更换标准。为了验证所提出的技术，对单相光伏系统进行了详细的仿真研究。该技术已在按比例缩小的太阳能光伏逆变器原型上进行了实验验证。

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