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A Modified Method for Measuring Harmonic Current Based on Instantaneous Reactive Power Theory

He Yihong Zhuo Fang Zhou Xin Li Hongyu Liu Jinjun Wang Zhaoan (Xi'an Jiaotong University 710049 China)  
This paper proposes a new digital real time method which is a modified method for harmonic current detection based on instantaneous reactive power theory With complex integral algorithm and employing Hamming window function to suppress spectrum leakage,the measurement accuracy can be improved It can be used to measure not only the total harmonic current,but also the positive sequence and negative sequence components of each harmonics The validity of the method is verified by computer simulation It is also verified in the applications to a 30kVA active filter experimental prototype
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