Ripple‐reduced model predictive direct power control for active front‐end power converters with extended switching vectors and time‐optimised control

Fang, Hui; Zhang, Zhenbin; Feng, Xiaoyun; Kennel, Ralph

doi:10.1049/iet-pel.2015.0857

Cited by 40 publications

(34 citation statements)

References 40 publications

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“…According to the third line and the last line of Table I, the direction of io_in caused by V2 is opposite to that caused by V3, but these two vectors have the same direction of the output voltage, which means that the line current can track the line current with the same trend, but the movement of the capacitor voltage error is opposite by using V2 and V3, Therefore, V2 and V3 are a pair of redundant vectors for neutral-point voltage balancing. The same conclusion can be gotten for V 5 and V 6 .…”

Section: B Voltage Balancingsupporting

confidence: 74%

Low-Complexity Model Predictive Control of Single-Phase Three-Level Rectifiers With Unbalanced Load

Song

Wang

et al. 2018

IEEE Trans. Power Electron.

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Abstract-The neutral-point potential fluctuation in single-phase three-level rectifiers leads to coupling between the line current regulation and dc-link capacitor voltage balancing, deteriorating waveform quality of the line current. For addressing this issue, this paper proposes a low-complexity model predictive current control (MPCC) with constant switching frequency, which achieves a decoupling control of the line current and the neutral-point potential under the unbalanced load condition. The switching frequency is fixed by combining the MPCC scheme with predefined switching sequences. The boundary of the durations for voltage vectors in switching sequences is presented to balance the capacitor voltage without worsening the line current quality. The optimal switching sequence and the corresponding optimal durations of voltage vectors in the switching sequence are readily derived without the assessment of the cost function, which dramatically simplifies the complexity of the MPCC scheme. Finally, simulations and experimental results are conducted to verify the effectiveness of the proposed MPCC scheme.Index Terms-Model predictive current control (MPCC), neutral-point voltage balancing, single-phase three-level rectifiers, unbalanced load.

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Section: B Voltage Balancingsupporting

confidence: 74%

Low-Complexity Model Predictive Control of Single-Phase Three-Level Rectifiers With Unbalanced Load

Song

Wang

et al. 2018

IEEE Trans. Power Electron.

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“…There is not any PI or hysteresis controller in the proposed strategy compared with DPC and VOC. It provides a better dynamic response to the load variations (five cycles) than other predictive method proposed in Ma et al, Monfared et al, Song et al, and Fang et al 9,18,30,39 The proposed PPC has the more straightforward theory than the other strategies because of using some simple approximations. It observed that the converter has lower current harmonic distortion (<2%) than the proposed method in Ma et al, Monfared et al, and Song et al 9,18,30 The input current is sinusoidal.…”

Section: Discussionmentioning

confidence: 99%

“…It has constant output voltage with only 6% voltage ripple. It provides a better dynamic response to the load variations (five cycles) than other predictive method proposed in Ma et al, Monfared et al, Song et al, and Fang et al 9,18,30,39 The proposed PPC has the more straightforward theory than the other strategies because of using some simple approximations. It reveals that using three-level SVM for single-phase NPC rectifier makes this algorithm interesting for digital implementation.…”

Section: Discussionmentioning

confidence: 99%

Design and analysis of a simple predictive power controller for a 1.0‐kV single‐phase NPC PWM rectifier

Eshkevari

Mosallanejad

Sepasian

2018

Circuit Theory & Apps

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This paper proposes a 1-kV single-phase neutral point clamped (NPC) PWM rectifier with a simple predictive power controller (PPC). It includes the three-level NPC converter and a simplified PPC. This system achieved to feature multi-level converters and the ability to provide high voltage gain, and a control with accurate and straightforward predictive strategy without the need of PLL and PI controller. It also takes advantages of a digital delay compensator unit, a user-friendly single-phase three-level space vector modulation (SVM) with neutral point balancing, and bidirectional active and reactive power flow. The proposed rectifier provides low input current harmonic distortion (THD < 2%), input sinusoidal current waveforms, zero or desired reactive power flow, fast dynamic response (=5 cycles), high stability, high efficiency, and the lower DC voltage ripple (<6%). Simulations have been carried out for a 1 kV/20 kW rectifier under different conditions. In this analysis, various practical conditions have been investigated and discussed in details. Furthermore, the proposed system was compared with the other literature and conventional methods.KEYWORDS direct power control, high voltage gain active rectifier, predictive power controller, single-phase PWM rectifier

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“…where λ represents the weighting factor, P ref (k) and Q ref (k) are the instantaneous reference powers at the kth switching interval. For the equal importance of active power and reactive power, the weighting factor λ = 1 [27]. The cost function (22) is relative to the variable U z (k), in order to gain the minimum J(k), U z (k) needs to satisfy dJ k dU z k = 0…”

Section: Optimal Elliptical Radius Of U Ab Terminal Trajectorymentioning

confidence: 99%

Model predictive power control for grid‐connected ac–dc converters with trajectory optimisation of the modulated voltage vector

Liu

Song

Chen

et al. 2020

IET Power Electronics

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As a classical control algorithm for grid-connected ac-dc converters, the conventional proportional-integral (PI) based direct power control (DPC) has several disadvantages, including the complexity of tuning PI parameters and poor dynamic performance. To tackle those drawbacks, this study presents a simple model predictive power control (MPPC) scheme with pulse-width modulation stage for single-phase ac-dc converters. Distinct from previous MPPC schemes, the proposed approach is formulated in terms of the terminal trajectory of modulated voltage vector, which is defined as an elliptic region. From the elliptical trajectory point of view, the proposed approach applies a cost function to predict an optimal radius of elliptic trajectory instead of the outputs of inner-loop PI controllers in PI-based DPC. To solve the parameter sensitiveness problem of MPPC schemes, a quantitative relationship between the predicted powers and their references considering inductance mismatch is analysed in detail. Then, an inductance estimation method is developed according to the analysis. A comprehensive experimental comparison with conventional PI-based DPC, and finite-control-set MPPC schemes have been conducted to verify the effectiveness of the proposed scheme.

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Ripple‐reduced model predictive direct power control for active front‐end power converters with extended switching vectors and time‐optimised control

Cited by 40 publications

References 40 publications

Low-Complexity Model Predictive Control of Single-Phase Three-Level Rectifiers With Unbalanced Load

Low-Complexity Model Predictive Control of Single-Phase Three-Level Rectifiers With Unbalanced Load

Design and analysis of a simple predictive power controller for a 1.0‐kV single‐phase NPC PWM rectifier

Model predictive power control for grid‐connected ac–dc converters with trajectory optimisation of the modulated voltage vector

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