Impedance-Frequency Characteristic of MMC-MTDC System

doi:10.3969/j.issn.1000-7229.2017.08.016

Abstract

Abstract: ABSTRACT： This paper investigates the frequency response characteristics of modular multilevel converter-multi-terminal direct current （MMC-MTDC） system under AC background harmonics. Firstly, we analyze the frequency-impedance characteristics of MMC-MTDC system to illustrate the reason of the DC network resonance caused by AC background harmonics. Secondly, we analyze the relation between the inductance value of smoothing reactor and the resonant frequency of MMC-MTDC system, which can be used as the basis for the reasonable selection of smoothing reactor to avoid the resonance of the DC network at AC harmonic complementary frequency. Finally, the analytical results and the relationship between resonant frequency of DC network and smoothing reactor are verified by the simulation model of a 4-terminal MMC-MTDC in PSCAD. The simulation results validate the correctness the theoretical analysis, and confirm that the resonant frequency of DC network can be changed by adjusting the inductance value of smoothing reactor, in order to avoid the resonance of the DC network caused by AC harmonic complementary frequency.

Key words: KEYWORDS： , background harmonics, modular multilevel converter （MMC）, multi-terminal direct current （MTDC）, resonance, impedance-frequency characteristic

CLC Number:

TM 72

TIAN Yifan, XU Dong, HAN Minxiao, ZHENG Chao. Impedance-Frequency Characteristic of MMC-MTDC System

[J]. Electric Power Construction, 2017, 38(8): 118-.

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