Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Harmonic State Space Modeling of a Three-Phase Modular Multilevel
  Converter   This paper presents the harmonic state space (HSS) modeling of a three-phase
modular multilevel converter (MMC). MMC is a converter system with a typical
multi-frequency response due to its significant harmonics in the arm currents,
capacitor voltages, and control signals. These internal harmonic dynamics can
have a great influence on the operation characteristics of MMC. However, the
conventional modeling methods commonly used in two-level voltage-source
converters (VSCs), where only the fundamental-frequency dynamic is considered,
will lead to an inaccurate model that cannot accurately reflect the real
dynamic characteristics of MMC. Therefore, the HSS modeling method, in which
harmonics of state variables, inputs, and outputs are posed separately in a
state-space form, is introduced in this paper to model the MMC in order to
capture all the harmonics and the frequency couplings. The steady-state and
small-signal dynamic HSS models of a three-phase MMC are developed,
respectively. The validity of the developed HSS model of a three-phase MMC has
been verified by the results from both the nonlinear time domain simulation
model in MATLAB/Simulink and the laboratory prototype with 12 submodules per
arm.

28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
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The categories of this paper are: q-fin
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
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The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
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The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
19
The categories of this paper are: eess