一种基于幅值调制的新型电力系统正弦频率测量方法

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Abstract In the aspect of power system sinusoidal frequency measurement,the current frequency measurement technology has the defects of low accuracy and weak anti-interference ability.A novel sinusoidal frequency measurement based on the amplitude modulation and the precise amplitude calculation method is proposed.The principle of low-frequency sinusoidal measurement based on amplitude modulation is analyzed.It is pointed out that the mixed-frequency interference is the main cause of the measurement error.By deeply inhibiting the interference of mixed-frequency,the accuracy of sinusoidal frequency measurement is improved.Mathematical calculation,simulation test and the physical experiment results verify the correctness and effectiveness of the proposed method.

Key words： Amplitude modulation measurement of sinusoidal frequency mixer mixed-frequency interference precise amplitude calculation

Received: 18 December 2014 Published: 25 May 2015

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TM351

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	Li Jun
	Wang Yuechao

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Li Jun,Wang Yuechao. A Novel Power System Sinusoidal Frequency Measurement Method Based on Amplitude Modulation[J]. Transactions of China Electrotechnical Society, 2015, 30(7): 144-150.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2015/V30/I7/144

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