电网电压不平衡下串联型12脉波整流装置的频域谐波建模

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Abstract Concerning the series 12-pulse rectifier which is widely used in the high-voltage direct current transmission or the high power rectifying industries,this paper analyzes its operation principle of the equivalent rectification circuit.On this basis,the harmonically coupled admittance matrices of the 12-pulse rectifier under the effect of the positive sequence and the negative sequence voltage are respectively derived,which considers the triggering angle offset caused by the unbalanced voltage condition as well as the commutation overlap angle of the thyristor-controlled rectifying circuit.The harmonically coupled admittance matrix model of the 12-pulse rectifier under unbalanced voltage condition is further established.This model can be used to calculate the harmonic current of the rectifying device analytically.It has the advantage of no need for iteration.Then the experimental platform for the 12 pulse rectifier is set up,the distribution characteristics of the coupled harmonic admittance matrix elements are analyzed,and the accuracy of the rectification model varying with the voltage distortion rate,the unbalance degree,and the firing angle is discussed in this paper.Finally,the efficacy of the proposed frequency-domain analytical model is verified by the comparison between the calculation and the experiment.

Key words： 12-pulse rectification unbalanced voltage harmonic model commutation overlap angle harmonically coupled admittance matrix

Received: 19 November 2014 Published: 13 April 2015

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TM46

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	Wang Jiajia
	Zhou Niancheng
	Wang Qianggang
	Wei Nengqiao

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Wang Jiajia,Zhou Niancheng,Wang Qianggang等. Frequency-Domain Harmonic Modeling of the Series 12-pulse Rectifier Under Unbalanced Voltage Condition[J]. Transactions of China Electrotechnical Society, 2015, 30(5): 69-78.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2015/V30/I5/69

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