Model predictive control scheme with active damping function for current source rectifiers

Abstract

This study presents a model predictive control (MPC) with active damping function for current-source rectifiers (CSRs). Since optimal modulating vector selection process of MPC leads to spread harmonic distribution in pulse-widthmodulated (PWM) waveform, inductor-capacitor (LC) resonance can be easily excited. Conventional MPC was designed without the consideration of active damping, since it is for low-power CSRs with large line resistors physically connected inside the circuit, whereas the proposed scheme achieves active damping function through a specially developed cost function, which realizes active damping function even for high-power CSRs with lightly damped LC circuit. In comparison with conventional MPC, the advantages of the proposed scheme are threefold: first, the proposed scheme is totally based on MPC concept, without conventional linear controller used. Second, with the active damping term added in the developed cost function, active damping effect can be involved into MPC, which extends MPC to high-power CSRs with lightly damped LC circuit. Last but not least, the proposed scheme is realized in the dq-axis synchronous frame, which allows the use of simple low-pass filters instead of complex band-stop filters to obtain the damping current.

Double‐step model predictive direct power control with delay compensation for three‐level converter

“…Many delay compensation algorithms with T s delay have been proposed to remove the adverse effect of the delay time in conventional MPDPC [16,21,22]. As the computing time t c1 (0.091752 ms) provided in the experimental results is close to T s , it adopts these delay compensation algorithms with T s delay to validate the effectiveness of the proposed approach.…”

“…Equation (16) shows that P(k + 1) and Q(k + 1) are determined by P(k), Q(k), f p (k − 1) and f q (k − 1). Similarly, the active and reactive powers are regulated by choosing OSS at time instant k, P(k + 2) Q(k + 2) can be expressed by P(k + 1), Q(k + 1), f p (k) and f q (k).…”

“…Many control algorithms can be utilised to regulate the output voltage of the 3L converter in a grid-tied system [3,5,13]. According to the control objective, they are classified as voltageoriented control with an outer voltage loop and an interior currentcontrol loop [14][15][16] or direct-power control (DPC) [17][18][19]. In the DPC, the instantaneous active and reactive powers are regulated to trace the reference directly.…”

Hybrid voltage vector preselection based model predictive control to reduce the common‐mode voltage for 2‐level voltage source inverters

“…In recent years, as a heuristic non-linear control method, model predictive control (MPC) has been frequently researched in the field of power electronics and power drives due to its simple and flexible control characteristics [1][2][3][4]. The authors [5,6] have investigated the application of MPC strategy to 2-level voltage source inverters (2L-VSIs) and motor controls.…”

“…Then, all the VVs of the 2L-VSI are substituted into (3) to predict the current at (k + 2)th instant, and all the predicted values are further substituted into the cost function given in (4) to select one optimal VV that can minimise (4)…”