Model Predictive Control of an Indirect Matrix Converter with Active Damping Capability

Yıl 2020, , 31 - 39, 31.01.2020

Mustafa Gökdağ , Ozan Gülbudak

https://doi.org/10.17694/bajece.614528

Cited By: 1

Öz

In
this paper, a model predictive control (MPC) scheme is proposed to control
indirect matrix converter (IMC), which is used for three phase-to-three phase
direct power conversion. IMC is composed of back-to-back connected conventional
current source rectifier (CSR) and voltage source inverter (VSI) without any
intermediate energy storage component between them. The aim in the control of
CSR side is generally to have unity power factor with relatively low total
harmonic distortion (THD) and the aim in the control of VSI side is to be able
to synthesize sinusoidal load currents with desired peak value and frequency.
Imposed source current MPC technique in abc frame is used for the rectifier
side and cost function evaluation process calculates three-phase supply current
errors respect to its reference. Supply currents for next sampling interval are
predicted using the discrete form of input filter model. The peak value of
sinusoidal supply current reference is generated from the error in load current
space vector using a PI compensator. This generated reference is synchronized
with supply voltage by the multiplication of Proportional-Integral (PI)
compensator output value and instantaneous three-phase supply voltage. An
active damping technique, which does not require to select an optimum value for
fictitious damping resistor, is also included in the proposed control scheme in
order to mitigate the resonance phenomenon of lightly damped input LC filter to
suppress the higher order harmonics in supply currents. Load currents with
desired peak and frequency are also obtained by imposing sinusoidal currents in
abc frame. The cost function for VSI stage evaluates output
load current error.
Load current predictions are obtained by using the discrete form of load model.
These two cost functions are combined into a single cost function without any
weighting factor since both
error terms are in the same nature. The switching state that minimizes this
pre-defined cost function among the 24-valid switching combinations of IMC is
selected and applied to converter. The proposed model predictive control with
active damping method shows good performance in terms of THD levels in supply
currents even at low current demands from supply side. The proposed model predictive control method
combined with active damping strategy guarantees unity power factor operation
and draws sinusoidal load currents at desired peak and frequency.

Anahtar Kelimeler

Indirect matrix converter, ac-ac power conversion, model predictive control, active damping

Kaynakça

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