A Simplified Model Predictive Control for T-Type Inverter with Output LC Filter

Ngo, Van-Quang-Binh; Nguyen, Minh-Khai; Tran, Tan-Tai; Lim, Young‐Cheol; Choi, Joon-Ho

doi:10.3390/en12010031

Cited by 18 publications

(13 citation statements)

References 32 publications

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“…Under the assumption of a constant DC-bus voltage and C 1 = C 2 = C dc , the dynamic of neutral-point voltage (u z ) can be phrased in terms of the switching states and the grid currents [22]:…”

Section: Mathematical Modelmentioning

confidence: 99%

“…Moreover, it is necessary to require a small sampling time to obtain a reasonable steady-state and good transient performances. To overcome these issues, various approaches have been developed such as using DPC established on extended-state observation with PWM [18], port-controlled Hamiltonian system [12], sliding mode control [19], and predictive control [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

“…Nonetheless, the computational burden of this approach is large, similar to the conventional FCS-MPC in the unfavorable case. The proposed approach is presented in [22] to reduce the execution time by using the preselected voltage reference and DC-bus capacitor voltage balancing. Nonetheless, this method is only applied to a 3L-T-type inverter with LC filter in standalone mode.…”

Section: Introductionmentioning

confidence: 99%

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A Modified Model Predictive Power Control for Grid-Connected T-Type Inverter with Reduced Computational Complexity

et al. 2019

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This study proposed a modified power strategy based on model predictive control for a grid-connected three-level T-type inverter. The controller utilizes the mathematical model to forecast the performance of the grid current, the balance of DC-bus capacitor voltages and switching frequency. The proposed method outlines a new technique to formulate a control objective. The control objective includes the absolute error of the inverter voltage reference and its possible values instead of the grid current error. By using the modified equivalent transformations in the cost function, the execution time was reduced 22% compared to the traditional model predictive control while maintaining the high dynamic performances of the power and low total harmonic distortion of the current. A comparative investigation showed that the proposed method obtains a high-performance control compared with the classical power control scheme with linear PI controllers and space vector modulation. The feasibility of the proposed method was verified by the simulation and experimental results.

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Section: Mathematical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Modified Model Predictive Power Control for Grid-Connected T-Type Inverter with Reduced Computational Complexity

et al. 2019

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“…In [12], a three-phase transformerless T-type multilevel inverter for photovoltaic application was proposed, and a novel hysteresis space vector current control (HSVCC) scheme was used to mitigate the common-mode leakage current and assure capacitor balancing; however, there was no specific explanation how the HSVCC scheme affects the capacitor balancing. In [13], the simplified model predictive control for a T-type inverter was proposed, and the predicted neutral point voltage was used just to select the suitable small vectors without the weighting factor in the cost function for balancing capacitor voltages with reduced execution time. In summary, research about an exact analytical model for the neutral point current has not been presented.…”

Section: Introductionmentioning

confidence: 99%

Analytical Modeling of Neutral Point Current in T-type Three-level PWM Converter

Lee

2020

Energies

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Since a T-type three-level PWM converter has several intrinsic advantages, it has been researched for various applications such as grid-connected converter systems. However, it necessarily requires an additional voltage control loop for balancing the upper and the lower DC-link voltage. To satisfy this requirement, an offset voltage is widely used to provide a neutral point current without affecting other variables such as total DC-link voltage and three-phase input current. However, these methods are mostly based on the averaged value between the applied offset voltage and the neutral point voltage or current, and there is no exact analytical model. Therefore, in this paper, the exact theoretical relationship between the offset voltage and the neutral point current is analyzed. This result can be expected to be useful for an effective voltage balancing control loop design as well as the better understanding of the whole system operation. The validity of the obtained analytical model is verified by simulation and experimental results.

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“…The various frameworks of MPC have also gained a great deal of attention in the optimization of flux weakening [11] and enhancement of dc link utilization [12]. The latter aims to expand higher speed operation beyond the nominal range by controlling the field strength and reducing the back electromotive force (EMF).…”

Section: Introductionmentioning

confidence: 99%

A Modulated Model Predictive Current Controller for Interior Permanent-Magnet Synchronous Motors

Agustin

Lin

et al. 2019

Energies

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Model predictive current controllers (MPCCs) are widely applied in motor drive control and operations. To date, however, the presence of large current errors in conventional predictive current control remains a significant predicament, due to harmonic distortions and current ripples. Naturally, noticeable current estimation inaccuracies lead to poor performance. To improve the above situation, a modulated model predictive current controller (MMPCC) is proposed for interior permanent-magnet synchronous motors (IPMSMs) in this paper. Two successive voltage vectors will be applied in a sampling period to greatly boost the number of candidate switching modes from seven to thirteen. A cost function, which is defined as the quadratic sum of current prediction errors, is employed to find an optimal switching mode and an optimized duty ratio to be applied in the next sampling period, such that the cost value is minimal. The effectiveness of the proposed method is verified through eight experiments using a TMS320F28379D microcontroller, and performance comparisons are made against an existing MPCC. In terms of quantitative improvements made to the MPCC, the proposed MMPCC reduces its current ripple and total harmonic distortion (THD) by, on average, 27.17% and 21.84%, respectively.

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A Simplified Model Predictive Control for T-Type Inverter with Output LC Filter

Cited by 18 publications

References 32 publications

A Modified Model Predictive Power Control for Grid-Connected T-Type Inverter with Reduced Computational Complexity

A Modified Model Predictive Power Control for Grid-Connected T-Type Inverter with Reduced Computational Complexity

Analytical Modeling of Neutral Point Current in T-type Three-level PWM Converter

A Modulated Model Predictive Current Controller for Interior Permanent-Magnet Synchronous Motors

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