A new power calculation method for single-phase grid-connected systems
A new power calculation method for single-phase grid-connected systems
复制标题
一种新的单相并网系统功率计算方法
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
F. Blaabjerg
中科院分区：
文献类型：
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作者：
Yongheng Yang;F. Blaabjerg
本文提出了一种计算单相系统平均有功功率和平均无功功率的新方法。它可用于需要准确快速计算输出有功功率和无功功率的不同应用。例如，处于低电压穿越操作模式的并网光伏系统需要用于功率控制回路的功率反馈。通常，在这样的系统中可以采用基于离散傅立叶变换（DFT）的功率计算方法。然而，DFT方法引入至少一个周期的时间延迟。基于自适应滤波技术的新功率计算方法可以实现更快的响应。通过实验验证了该方法的性能，并在不同条件下运行的1 kW单相并网系统中进行了演示。实验结果表明了该功率计算方法的有效性。
A new method to calculate average active power and reactive power for single-phase systems is proposed in this paper. It can be used in different applications where the output active power and reactive power need to be calculated accurately and fast. For example, a grid-connected photovoltaic system in low voltage ride through operation mode requires a power feedback for the power control loop. Commonly, a Discrete Fourier Transform (DFT) based power calculation method can be adopted in such systems. However, the DFT method introduces at least a one-cycle time delay. The new power calculation method, which is based on the adaptive filtering technique, can achieve a faster response. The performance of the proposed method is verified by experiments and demonstrated in a 1 kW single-phase grid-connected system operating under different conditions. Experimental results show the effectiveness of the proposed power calculation method.