Virtual-flux-based predictive direct power control of three-phase AC/DC converters

Abstract

In this paper, a novel predictive direct power control (PDPC) strategy is proposed for three-phase AC/DC converters, which is based on a straightforward regulation of instantaneous active and reactive power. The converter controlled by the proposed strategy realizes operations without line-side voltage sensors by introducing the virtual flux (VF) concept and a grid voltage estimation method based on the instantaneous power. A constant converter switching frequency is achieved by employing the space vector modulation, which simplifies the design of the line filter. Simulation results show that the improvement of power ripple elimination and sinusoidal line currents can be observed in the proposed PDPC at a lower switching frequency. Comparative studies reveal that the steady behaviors of the proposed PDPC are superior to that of the conventional look-up-table DPC (LUTDPC) and PDPC, moreover the transient process of which is more shorter compared with that of the conventional LUTDPC.Index Terms-Predictive direct power control (PDPC), virtual flux (VF), voltage sensorless control, AC/DC converters, space vector modulation (SVM)

A Review on Popular Control Applications in Wind Energy Conversion System Based on Permanent Magnet Generator PMSG

“…The SVM technique requires a referential transformation to present the virtual flux and the grid voltage to offer the sequence and the duration of the vectors applied to the converter. In addition, it requires a powerful calculator that makes it possible to put the various complex operations in force [101][102][103][104][105][106][107][108][109][110][111][112].…”

A power quality enhanced grid voltage sensorless predictive direct power control for active front end rectifiers

“…MPC requires very high sampling rate (Kouro et al, 2009) to obtain the desired control performance for power converters control. Predictive direct power control is emerging control technique in which well-known direct power control is consolidated with the predictive method of voltage vector sequence selection to enhance the steady-state as well as transient performance (Antoniewicz and Kazmierkowski, 2008; Cho and Lee, 2016; Hu et al, 2014; Song et al, 2014; Tao et al, 2014; Zhang et al, 2014). Hence, in this work considering the simplicity and ease of implementation into consideration DBC is utilized (Hu et al, 2014; Mesbah et al, 2011).…”

“…Predictive control is the most widely utilized method for control applications. Various predictive control techniques are reported in the literature (Antoniewicz and Kazmierowski, 2008; Cho and Lee, 2016; Hu et al, 2014; Song et al, 2014; Tao et al, 2014; Zhang et al, 2014). Model Predictive direct power control is likewise discussed in literature (Choi and Lee, 2015; Kouro et al, 2009).…”

Combined control method for grid‐side converter of doubly fed induction generator‐based wind energy conversion systems

“…However, DPC like VC suffers from some disadvantages such as (i) higher power ripple and variable switching frequency due to hysteresis power controllers, and (ii) less robustness to measurement noise due to reliance on the instantaneous values of just a few measured signals. Therefore, several modified strategies have been proposed for three-phase grid-connected VSCs to address these problems [14][15][16][17][18][19][20][21][22]. A DPC using space vector modulation (SVM) [14], a sliding mode DPC [15], and an adaptive back-stepping terminal sliding mode DPC [16] have been proposed to enhance the transient performance and achieve constant switching frequency.…”

“…However, they suffer from chattering problem and require high online calculation [15,16]. A predictive DPC using SVM [17], an adaptive robust predictive DPC [18], a dead-beat predictive DPC [19,20], and a virtual fluxbased predictive DPC [21,22] have been proposed for three-phase grid-connected VSCs to obtain both fast transient response and constant switching frequency. Nevertheless, extra drawbacks such as (i) complex online computation, (ii) require a precise model of the filter, (iii) sensitive to parametric variations of the controlled system and high total harmonic distortion (THD) for non-linear loads, and (iv) extensive hardware implementation have been introduced [17][18][19][20][21][22].…”