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The Investigation of Equivalent Harmonic Impedances of VSC-Based HVDC Systems

Phuchuy Nguyen and Minxiao Han
School of Electrical Engineering, North China Electric Power University, Beijing 102206, P.R. China
Abstract—In a PWM-based low level voltage source converter (VSC), the harmonic level is significant that filters should be required on the both sides of the converter. The converter will have harmonic impedances as seen from the both sides, and it matters to assess these impedances to calculate their impact on filters and the network also. In this paper, the equivalent harmonic impedances on both ac- and dc-sides of VSC are calculated based on the ac/dc harmonic interaction with any switching components. The effect of cross-interaction between switching components on the harmonic impedance is also investigated. Moreover, the resonance analysis is performed on the both ac-side and dc-side of a VSC-based HVDC system. Although the VSC dc-side harmonic impedance is very large, the resonances may occur due to the existence of dc capacitors and dc cables. On the ac-side, the resonances may occur at the output terminal of the converter and interact with the dc-side circuit, causing harmonic amplification. 
 
Index Terms—VSC, VSC-based HVDC, resonance, harmonic impedance

Cite: Phuchuy Nguyen and Minxiao Han, "The Investigation of Equivalent Harmonic Impedances of VSC-Based HVDC Systems," International Journal of Electronics and Electrical Engineering, Vol. 4, No. 1, pp. 29-33, February 2016. doi: 10.18178/ijeee.4.1.29-33
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