Harmonic transfer characteristics of MMC‐HVDC systems. Issue 13 (19th January 2018)

• Record Type: Journal Article
• Authors: Rong, Li; Jun, Wen; Ruoxi, Liu; Han, Yan; Kangsheng, Cui
• Is Part Of: Journal of engineering. Volume 2017:Issue 13(2017)
• Page Start: 2241
• Page End: 2245
• Publication Date: 2018-01-19
• Subjects: HVDC power transmission -- HVDC power convertors -- network topology -- power system harmonics; harmonic transfer characteristics -- MMC‐HVDC systems -- modular multilevel converter -- high‐voltage electric energy conversion -- high‐voltage direct current transmission -- common DC bus -- structural characteristics -- AC‐DC‐side harmonic -- circuit topology -- coupling relationship -- switching function method -- modulation theory -- circulating current -- analytical point of view -- MMC converter -- PSCAD‐EMTDC -- simulation model; Engineering -- Periodicals; Engineering; Electronic journals; Periodicals; 620.005
• DOI: 10.1049/joe.2017.0729
• Languages: English
• ISSNs: 2051-3305

Abstract

Abstract : Modular multilevel converter (MMC) is considered as the most potential development of multilevel converter, the future of high‐voltage electric energy conversion, especially in the high‐voltage direct current (HVDC) transmission since the very beginning because of its unmatched advantages such as high modularity, compact structure, high quality of output waveform, and common DC bus. However, due to the structural characteristics of the MMC itself, there will be circulating current that cannot be eliminated but suppressed in the arm, causing AC/DC‐side harmonic. Here, the authors first analyse the circuit topology, working principle, and characteristics of the MMC. The coupling relationship of MMC is studied by using the switching function method in the modulation theory, to facilitate rigorous analysis of the interrelationship between the harmonic and circulating current of MMC and the influencing factors of the harmonic from the analytical point of view. The influence of the harmonic generated by the MMC converter on the AC/DC side can be obtained by derivation. Moreover, the transfer mechanism of the background harmonic coming from AC system is further studied. Furthermore, the foregoing conclusions on harmonic transfer characteristics of MMC‐HVDC system are verified by using the simulation model built on PSCAD/EMTDC.