Model Predictive Direct Power Control for Grid-Connected NPC Converters

Scoltock, James; Geyer, Tobias; Madawala, Udaya K.

doi:10.1109/tie.2015.2410259

Cited by 110 publications

(56 citation statements)

References 32 publications

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“…When equation (3) is applied (as shown in Fig. 3a), the predicted current vector i xy (k+1) can be determined by: (14) i xy (k + 1) = i xy (k) + ∆i xy (k + 1). (15) Predicted current error in next sample time (k + 1)T s is calculated using the following equation:…”

Section: Pci-3l Methods Is Variation Of Fcs-mpc Methodsmentioning

confidence: 99%

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Predictive and look-up table control methods of a three-level AC-DC converter under distorted grid voltage

Falkowski¹,

Kulikowski²,

Grodzki³

2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. Power electronic three-level AC-DC converters connecting a utility grid with DC supplies are widely used in renewable energy sources. For such distributed systems, the quality of energy is very important. Hence, control algorithms of an AC-DC converter have to provide not only a sinusoidal shape of grid current, but also stable operation during transient states in the grid, e.g. voltage dips or voltage unbalance. This paper deals with the problem of robustness of AC-DC control methods under disturbed grid voltage. Three modern predictive control algorithms are presented and investigated under grid voltage distortions. Experimental results from a laboratory test setup illustrating properties of the described methods are shown. Conventional linear control methods, such as VOC and DPC-SVM, are designed to control only the fundamental component of current. In order to fulfill GCRs and achieve robustness under grid voltage distortion, these linear methods need additional compensation algorithms that, in turn, increase their complexity [16]. There are many publications concerning improvements of the classical control methods in order to ensure proper converter operation under grid voltage distortions [17][18][19]. However, there are only few that relate to non-linear or predictive control methods of AC-DC converters under grid voltage distortion [20,21]. This paper presents three modern non-linear control algorithms. The first one, direct power control three levels three areas (DPC-3L-3A) [13], is an extended version of the look-up table DPC with new optimal error plane distribution as well as with transfer of the error vector into a new coordinate system. Selection of the converter voltage vector is based on the error vector angle, which makes it possible to eliminate the inconvenience of using comparators. The second method presented here, called predictive control of current of three-level converter (PCi-3L) [22], belongs to the group of finite control set model predictive control methods (FCS-MPC). In the PCi-3L strategy the switches are controlled directly without modulation. This is performed by online minimizing of specific cost function J. Depending on the definition cost function, we can control many different variables, e.g. current, dc-link voltage, switching frequency, etc. Cost function is calculated for all converter voltage vectors. Minimum value of J determines the optimal switching combinations.

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Section: Pci-3l Methods Is Variation Of Fcs-mpc Methodsmentioning

confidence: 99%

“…The most popular ones are: the voltage oriented control (VOC) method with linear PI controllers and space vector modulation (SVM) or pulse width modulation (PWM) [11]; the DPC method with either linear (PI-SVM) [12] or nonlinear controllers [13]; and finally predictive control methods [14,15].…”

mentioning

confidence: 99%

Predictive and look-up table control methods of a three-level AC-DC converter under distorted grid voltage

Falkowski¹,

Kulikowski²,

Grodzki³

2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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“…MPDCC is another variant of MPC algorithm in which machine stator currents are kept within hysteresis bound around their references [47]. MPDPC is an extension of direct power control (DPC) where look-up operation is replaced by an on-line optimization algorithm [50]. All these techniques include penalty in cost function to minimize device switching frequency.…”

Section: B Predictive Controlmentioning

confidence: 99%

A Survey of Low Switching Frequency Modulation Techniques for Medium-Voltage Multilevel Converters

Edpuganti

Rathore

2015

IEEE Trans. on Ind. Applicat.

159

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Multilevel converters (MLCs) have emerged as standard power electronic converters for medium voltage high power industrial applications. Owing to dominating device switching losses in high power applications, it is preferable to use low device switching frequency (LDSF) modulation techniques. Then, it is possible to achieve higher device utilization, higher converter efficiency and reduced cooling requirements. However, there exists a trade-off between device switching frequency and harmonic distortion of converter output currents. Therefore, the main challenge for LDSF modulation techniques is to minimize the harmonic distortion of output currents. The goal of this paper is to provide a review of various LDSF modulation techniques proposed in the literature and also discuss in detail about one of the the emerging LDSF control techniques known as synchronous optimal pulsewidth modulation. Finally, challenges to LDSF modulation techniques for emerging multilevel topologies and future trends in applications of MLCs are discussed to motivate further research, to enhance proposed LDSF techniques and to explore for new alternatives.

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“…FCS-MPC has been proven to suit well for simple inductive filters (L-filters), e.g. presented in [8]- [11]. However, a LCL filter is an attractive alternative to reduce costs and improve dynamic response compared to conventional L-filters [27] [28].…”

Section: Introductionmentioning

confidence: 99%

Finite Control Set Model Predictive Current Control for Grid-Connected Voltage-Source Converters With <italic>LCL</italic> Filters: A Study Based on Different State Feedbacks

Panten

Hoffmann²,

Fuchs

2016

IEEE Trans. Power Electron.

183

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Model Predictive Direct Power Control for Grid-Connected NPC Converters

Cited by 110 publications

References 32 publications

Predictive and look-up table control methods of a three-level AC-DC converter under distorted grid voltage

Predictive and look-up table control methods of a three-level AC-DC converter under distorted grid voltage

A Survey of Low Switching Frequency Modulation Techniques for Medium-Voltage Multilevel Converters

Finite Control Set Model Predictive Current Control for Grid-Connected Voltage-Source Converters With <italic>LCL</italic> Filters: A Study Based on Different State Feedbacks

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