A new predictive control scheme for a VSI with reduced common mode voltage operating at fixed switching frequency
11 May 2015-pp 617-622
TL;DR: In this paper, the authors proposed a predictive control strategy with a fixed switching frequency for a voltage source inverter, with the aim of obtaining a modulated waveform at the output of the converter with a natural reduction of the common mode voltage.
Abstract: Traditional finite-set model predictive control (FS-MPC) techniques are characterized by a variable switching frequency which causes noise as well as large voltage and current ripple. In this paper a novel predictive control strategy with a fixed switching frequency for a voltage source inverter is proposed, with the aim of obtaining a modulated waveform at the output of the converter with a natural reduction of the common mode voltage. The feasibility of this strategy is evaluated using simulation results to demonstrate the advantages of predictive control, such as fast dynamic response and the easy inclusion of nonlinearities and they are compared with the modulated model predictive control (M2PC) proposed recently.
Citations
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TL;DR: A novel control scheme based on an optimal application of three voltage vectors in a symmetrical way, which takes advantage of advanced PWM techniques and the virtual flux-based control scheme is introduced to achieve voltage sensorless control.
Abstract: A voltage sensorless control of low-complexity model predictive direct power control (LC-MPDPC) for pulsewidth modulation (PWM) rectifier is proposed. The conventional LC-MPDPC adopts one or two voltage vectors during one control period, which achieve good steady-state performance and quick dynamic response. In addition, based on the mathematical model of the real system, the conventional method only requires one prediction to find the optimal voltage vector, which reduces the control complexity and computational burden. However, the use of one or two vectors during one sampling interval presents abundant current harmonics and high power ripples, and the switching frequency is variable. In order to solve these problems while preserving all the advantages of the conventional LC-MPDPC, this paper presents a novel control scheme, with the aim of operating at a constant switching frequency and obtaining an excellent steady-state performance at a low switching frequency. The proposed method is based on an optimal application of three voltage vectors in a symmetrical way, which takes advantage of advanced PWM techniques. Furthermore, the virtual flux-based control scheme is introduced to achieve voltage sensorless control. The proposed strategy is compared with the conventional MPDPC methods and its effectiveness is confirmed by both simulation and experimental results from a three-phase PWM rectifier under 1000-W operation condition.
43 citations
Cites background from "A new predictive control scheme for..."
...However, in order to reduce the common mode voltage, a modification of M2PC is presented, in which zero vectors are replaced by two adjacent active vectors [24]....
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TL;DR: Predictive control appears as a very promising control scheme with several advantages for microgrid applications of different control levels and with adaptations of the models in order to include uncertainties to improve their performance and dynamics response.
Abstract: Microgrids need control and management at different levels to allow the inclusion of renewable energy sources. In this paper, a comprehensive literature review is presented to analyse the latest trends in research and development referring to the applications of predictive control in microgrids. As a result of this review, it was found that the application of predictive control techniques on microgrids is performed for the three control levels and with adaptations of the models in order to include uncertainties to improve their performance and dynamics response. In addition, to ensure system stability, but also, at higher control levels, coordinated operation among the microgrid’s components and synchronised and optimised operation with utility grids and electric power markets. Predictive control appears as a very promising control scheme with several advantages for microgrid applications of different control levels.
43 citations
Cites background from "A new predictive control scheme for..."
...This results in noise and high voltage or current ripples in the power converter operation [36,37], affecting a wide spectrum, which decreases the power quality as the outcome [38,39]....
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01 Oct 2016
TL;DR: A new control scheme based on a Finite Set-Model Predictive Control (FS-MPC) and aims of a fixed switching frequency operation that allows of obtaining a voltage vector that is responsible of nullifying the cost function's derivative for its optimization.
Abstract: this paper introduces a new control scheme based on a Finite Set-Model Predictive Control (FS-MPC) and aims of a fixed switching frequency operation. The proposed scheme allows of obtaining a voltage vector that is responsible of nullifying the cost function's derivative for its optimization. Moreover, a closed-loop space vector modulation (SVM) based on the proposed predictive control scheme is introduced for a three-level grid connected inverter. The proposed algorithm that injects a desired current to the grid is investigated through external perturbations such as change in the line current amplitude as well as DC voltage variation. Discrete-time system model was developed and simulated. Simulation results on MATLAB/Simulink are provided to verify the fast dynamic performance, and good voltage balancing of DC bus capacitors of the NPC inverter.
17 citations
Cites background or methods from "A new predictive control scheme for..."
...Other methods were introduced based on the switching behavior of the PWM modulator with a switching frequency divided into smaller steps [14-16], or on duty cycle generation based on a suitable modulation scheme in the cost function minimization [11-13]....
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...In literature several papers where published trying to resolve this drawback [8-16]....
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01 Apr 2017
TL;DR: In this paper, a model based predictive control strategy with a fixed switching frequency applied to a three-phase cascade H-bridge multilevel STATCOM is introduced with the aim to increase the performance of classical model predictive control.
Abstract: The absence of modulator in model based predictive control technique for different converter topologies generates a variable switching frequency that produces high frequency harmonics and higher stress on the power semiconductor devices. In this paper, a novel model based predictive control strategy with a fixed switching frequency applied to a three-phase cascade H-bridge multilevel STATCOM is introduced with the aim to increase the performance of classical model predictive control. Simulation results show increased performance of the proposed control method in terms of current waveform total harmonic distortion.
17 citations
01 Nov 2018
TL;DR: An improved finite control set model predictive control (FCS-MPC) algorithm based on virtual space vector is proposed to reduce computational burden, and achieve a constant switching frequency for two-level three-phase inverters.
Abstract: This paper proposes an improved finite control set model predictive control (FCS-MPC) algorithm based on virtual space vector to reduce computational burden, and achieve a constant switching frequency for two-level three-phase inverters. The voltage vector reference is calculated in a 60° coordinate system according to the principle of deadbeat (DB) technique. A large number of virtual voltage vectors synthesized by discrete space vector modulation (DSVM) is utilized to approach the voltage vector reference. To avoid enumerating all the virtual voltage vectors from a look-up table, an algebraic way using the voltage vector reference is adopted to calculate the three candidate vectors. Then, a cost function is defined to select the optimal voltage vector among them. This new method greatly improves the computation efficiency since plenty of multiply operation is eliminated in the 60° coordinate system. Moreover, a fixed switching frequency is achieved since the durations of each switch states has been calculated. Experimental results under a two-level three-phase inverter verify the effectiveness of the proposed control strategy.
11 citations
Cites methods from "A new predictive control scheme for..."
...Another effective way is to utilize a mathematical methodology, which searches the optimal duty cycle that could minimize the defined weighted error, to calculate the duty cycle [16], [17]....
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References
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TL;DR: In this article, a dead-beat predictive direct power control (DPC) strategy and its improved voltage vector sequences for reversible three-phase grid-connected voltage-source converters (VSCs) are presented.
Abstract: This paper presents a dead-beat predictive direct power control (DPC) strategy and its improved voltage-vector sequences for reversible three-phase grid-connected voltage-source converters (VSCs). The instantaneous variation rates of active and reactive powers, by applying each converter voltage vector in 12 different sectors, are deduced and analyzed. Based on the power variation rates, it is found that the values of the predicted duration times for the two conventional active converter voltage vectors are less than zero when the grid-connected VSC operates as either a rectifier or an inverter. In order to solve this issue, two new alternative vector sequences are proposed and compared. Experimental results on a 1.5 kW reversible grid-connected VSC system are presented to validate the feasibility of the proposed voltage-vector sequences on the dead-beat predictive DPC strategy.
155 citations
"A new predictive control scheme for..." refers background in this paper
...Different solutions have been proposed in the literature [6], [14], [15] which allow the operation at fixed switching frequency....
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10 Feb 2009
TL;DR: In this paper, the authors proposed a FS-MPC with constant switching frequency and low sampling frequency applying a Discrete Space Vector Modulation (DSVM) technique, where the real state vectors of the converter are combined with new virtual state vectors forming switching sequences each sampling period.
Abstract: Finite States Model Predictive Control (FS-MPC) appears as a promising control technique to be applied to power converters in the industry. However, the FS-MPC presents some drawbacks as non constant switching frequency and high sampling frequency. This work proposes a FS-MPC with constant switching frequency and low sampling frequency applying a Discrete Space Vector Modulation (DSVM) technique. The real state vectors of the converter are used together with new virtual state vectors forming switching sequences each sampling period. The advantages and disadvantages of the proposed FS-MPC with the DSVM are analyzed using a two-level three-phase inverter connected to the grid as setup to introduce the proposed technique. Simulation results are presented, showing that using the proposed technique the switching frequency is fixed and the sampling frequency can be lowered without reducing the quality of the converter behavior.
153 citations
TL;DR: In this paper, a predictive space vector PWM (SVPWM) current control technique with fixed switching frequency is proposed for asymmetrical dual three-phase AC drives, which achieves fast torque and current response similar to those obtained using conventional predictive current control techniques.
Abstract: The interest in multiphase drives has re-emerged in the last decade, being the asymmetrical dual three-phase induction motor drive one of the most popular options. Predictive control techniques, already implemented in three-phase drives, have been recently adapted to the multiphase case. Schemes proposed so far have demonstrated high performance at the expenses of a higher degree of computational cost and ill-defined switching frequency. In this study, a predictive space vector PWM (SVPWM) current control technique with fixed switching frequency is proposed for asymmetrical dual three-phase AC drives. Fast torque and current response are achieved similar to those obtained using conventional predictive current control techniques. Electrical noise suppression is favoured as in PWM current control methods. Experimental results are provided to examine the benefits of the proposed control method.
115 citations
"A new predictive control scheme for..." refers result in this paper
...Similar results are obtained in [10], where traditional PI controllers were substituted by a predictive controller but with a conventional modulation technique....
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TL;DR: In this article, a deadbeat predictive current controller is proposed to accurately predict the required duty ratio for the PWM pulse for a given reference current in each digital time step over the entire speed range of operation.
Abstract: The paper presents a novel fixed switching frequency predictive current control method for switched reluctancemachines (SRM). The proposed deadbeat predictive current controller accurately predicts the required duty ratio for thePWM pulse for a given reference current in each digital time step over the entire speed range of operation. The pulsewidth depends on the operating conditions, machine parameters and the rotor position. The controller utilizes themachine inductance profile as a function of current and rotor position to accurately predict the required voltage. Thecontrol method is studied through computer simulation and followed by experimental validation. The method is suitablefor torque ripple sensitive applications requiring accurate tracking of a given current profile and mitigating theaudible noise due to the switching of the inverter.
111 citations
"A new predictive control scheme for..." refers methods in this paper
...In [5], [11] a deadbeat predictive controller is proposed in order to determine the duty cycle for the PWM pulses for a given reference current over the entire speed range of operation of a switched reluctance machine....
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01 Nov 2013
TL;DR: A novel control technique, named Modulated Model Predictive Control, is introduced with the aim to increase the performances of the Predictive control in power converters.
Abstract: Multilevel Converters are known to have many advantages for electricity network applications. In particular Cascaded H-Bridge Converters are attractive because of their inherent modularity and scalability. Predictive control for power converters is advantageous as a result of its applicability to discrete system and fast response. In this paper a novel control technique, named Modulated Model Predictive Control, is introduced with the aim to increase the performances of the Predictive control. The proposed controller is described in detail and validated through simulation and experimental testing, in comparison with Dead-Beat and Model Predictive Control.
31 citations
"A new predictive control scheme for..." refers background in this paper
...The variable switching frequency produces a spread spectrum, decreasing the performance of the system in terms of power quality [4]– [8]....
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...Discussion As mentioned in [4] and [8], if the FS-MPC controller is evaluated and the control is applied at every sampling time (which means that only one output voltage vector is applied during the whole sampling period), the resulting switching frequency becomes variable where the maximum switching frequency occurs for a reference that is equivalent to a duty cycle of a 0....
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