Analysis on harmonic characteristics of interleaving paralleled static inverters under asymmetric conditions
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ORIGINAL ARTICLE
Analysis on harmonic characteristics of interleaving paralleled static inverters under asymmetric conditions Yihan Chen1 · Honghao Guo1 · Haixiao Ma1 · Chengzi Liu1 Received: 19 March 2020 / Revised: 11 September 2020 / Accepted: 14 September 2020 © The Korean Institute of Power Electronics 2020
Abstract With the large number of applications for multi electric aircraft (MEA), the power capacity of the aviation static inverter (ASI) has been continuously improved. Therefore, more and more modular parallel-based topologies are being used in the ASI to achieve power expansion. Combined with carrier phase-shift modulation, the harmonic components of a system can be further reduced. However, due to the parameter asymmetry between paralleled modules and power system disturbances, additional low frequency and DC bias components are superimposed on the control signal. This paper uses exponential function analysis to analyze the harmonic distribution of a modular ASI based on carrier phase-shift modulation under nonideal conditions. In addition, the distribution characteristics of different paralleled topologies are compared. Finally, the correctness of the theoretical analysis is verified by simulation and experimental results. Keywords Aviation static inverter · Carrier phase shift modulation · Harmonic distribution · Interleaved parallel
1 Introduction The high-frequency link topology-based ASI, which has the advantages of high efficiency and power density, is widely used in airborne power systems [1]. With the emergence of MEA and AEA, airborne 400 Hz AC loads have imposed higher requirements on the power capacity of ASIs. However, since this is limited by the power level of the switching device, it is necessary to improve the topology to meet power expansion needs, such as a multi-level topology [2] and a multi-modules parallel topology [3]. Traditional multi-level topologies require additional clamping devices, which reduces the reliability of the ASI [4]. In addition, aviation power systems also use a cascaded topology [5]. However, each of the cascaded modules requires an independent DC power supply when providing active power. This results in the former DC-DC converter topology and transformer structure to becoming more complicated [6]. Therefore, the multi-module paralleled method has become a valuable topology in ASI applications [7]. It can also use * Chengzi Liu [email protected] 1
College of Automation and College of Artificial Intelligence, Nanjing University of Posts and Telecommunications, Nanjing, China
interleaving technology based on carrier phase shift to optimize harmonic components, and its paralleled modules can be redundant with each other to improve the reliability of the ASI [8]. However, in applications it requires a complicated current sharing control strategy [9]. Combining a modular paralleled structure and a carrier phase shift control method can improve the power capacity of the ASI while improving the harmonic content on the input and output sides [10]. Howev
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