Resonance Characteristics of AC Systems with MIDC Transmission Systems

doi:10.3969/j.issn.1000-7229.2015.06.010

Abstract

Abstract:

In allusion to the East China Power Grid connected with super-large scale multi-infeed direct current (MIDC) transmission systems, which were composed of six HVDC and UHVDC transmission systems, firstly, the working mechanism of 12-pulse converter producing harmonic in grid and the reasons of power system resonance were analyzed. In addition, resonance scan was conducted for all 500　kV and part of 220 kV substations of Shanghai Power Grid with using PSASP program, scan types consisted of normal operation condition and fault operation conditions that might cause resonance in AC system. The results show that: in normal operation condition, some substations have serial and parallel resonance under low-order harmonic; while in fault operation condition, huge change may happen in some substations, the 8th, 11th and 13th harmonic parallel resonance may appear in these substations, which may cause harmonic amplification even harmonic resonance in 7th background harmonic in the AC system and the characteristic harmonics of 12-pulse converters: 11th and 13th harmonic, thereby leading to harmonic overvoltage and overcurrent. At last, the harmonic suppression measures were proposed.

Key words: multi-infeed direct current (MIDC) transmission, multi-infeed direct current &, alternative current (MIDC-AC) transmission system, resonance, impedance scan, overvoltage, harmonic

CLC Number:

TM 711

DIAO Guanxun， QIAO Guangyao， JI Cheng， WEN Jun. Resonance Characteristics of AC Systems with MIDC Transmission Systems[J]. ELECTRIC POWER CONSTRUCTION, 2015, 36(6): 59-64.

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