Model predictive direct power control strategy for leakage current suppression on a grid‐connected three‐level inverter

Gao, Fengyang; Yang, Kaiwen; Luo, Yinhang; Gao, Jianning; Song, Zhichao; Gao, Xuanyu

doi:10.1002/cta.3258

Cited by 3 publications

(9 citation statements)

References 17 publications

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“…The inverter control strategy is adopted from [19] for suppression of the leakage current. The fourth leg is used to constant the common mode voltage to achieve the leakage current suppression.…”

Section: Conventional Three-level Four-leg Grid-connected Inverter To...mentioning

confidence: 99%

“…The Figure shows that the excitation sources are 4u cm and e. There are two ideas to suppress the leakage current i cm without changing the component parameters. First, by excitation, the leakage current is indirectly suppressed by reducing the common mode voltage variation rate through the control strategy, as in [19]; second, by the principles of the hardware circuit, optimize the circuit topology to suppress the leakage current.…”

Section: B Mathematical Model Of the Conventional Topologymentioning

confidence: 99%

“…four-leg inverter to reduce leakage current, but discard part of the voltage vectors, which increases the fluctuation of the neutral point potential on the DC-side, weakening the stability of the system. In [19], for a three-phase four-leg inverter, the neutral point of filter capacitors is connected to the neutral point on the grid-side, a model predictive direct power control strategy is proposed to control the fluctuation of the common mode voltage to achieve the suppression of leakage current, but it increases the Total Harmonic Distortion (THD) of the grid-connected current.…”

Section: Introductionmentioning

confidence: 99%

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Topology Optimization Analysis of Leakage Current Suppression in Three-Level Four-Leg Photovoltaic Grid-Connected Inverter

Yang

Gao

2023

IEEE Access

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The grid-connected non-isolated photovoltaic inverter system suffers from the leakage current, which increases the loss of the system, and the grid-connected current harmonics impact the normal operation of the equipment. To this end, first, the leakage current mechanism in a conventional three-phase three-level four-leg grid-connected inverter is analyzed and two circuit topology improvement schemes are proposed. Second, mathematical modeling of different circuit topologies is carried out. With the leakage current and the harmonic distortion rate of the grid-side current as the main suppression indicators, the advantages and disadvantages of each topology are analyzed. Finally, the optimal leakage current suppression circuit topology is proposed for the three-level four-leg grid-connected inverter. Meanwhile, the corresponding objective function and constraints are constructed to solve the problem of selecting key components parameter by non-linear programming. Without additional control strategy, the proposed optimal circuit topology has a significant leakage current suppression performance compared to the other three topologies, only 10.24% of the conventional topology, and ensures that the grid-connected current total harmonic distortion rate meets the highest relevant standards.INDEX TERMS Three-phase four-leg inverter, three-level inverter, photovoltaic system, topology optimization, leakage current.

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Section: Conventional Three-level Four-leg Grid-connected Inverter To...mentioning

confidence: 99%

Section: B Mathematical Model Of the Conventional Topologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Topology Optimization Analysis of Leakage Current Suppression in Three-Level Four-Leg Photovoltaic Grid-Connected Inverter

Yang

Gao

2023

IEEE Access

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“…The control goal error terms are usually involved in the cost function, and an exhaustive search is employed to decide the optimum control actuation. The control sequence that offers the minimum cost value is recorded as an optimum input 18–20 . Fundamentally, the traditional MPC evaluates only the penalization terms, the error between the reference signals and the predictions, and no closed‐loop stability investigation is performed 21–24 .…”

Section: Introductionmentioning

confidence: 99%

“…The control sequence that offers the minimum cost value is recorded as an optimum input. [18][19][20] Fundamentally, the traditional MPC evaluates only the penalization terms, the error between the reference signals and the predictions, and no closed-loop stability investigation is performed. [21][22][23][24] Due to the lack of stability assessment in the optimization procedure, the traditional MPC formulation may agonize over the system instability in case of deviation from the nominal operating points.…”

mentioning

confidence: 99%

Model predictive sliding mode control of six‐phase induction motor using nine‐switch converter

Gülbudak

Gökdağ

Kömürcügil

2022

Circuit Theory & Apps

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This article proposes a new control strategy to regulate the six-phase induction machine fed by a nine-switch converter. The traditional model predictive control method is a favorable feedback control routine in variable-drive applications. However, the lack of the term that assess the closed-loop stability in the conventional cost function formulation may cause potential closed-loop instability and be incapable of tolerating the parameter mismatch. Furthermore, the conventional model predictive control formulation cannot ensure global optimality in case of deviation from the nominal operating point. In this paper, the closed-loop stability is enhanced by including a sliding mode stability term in the objective function. The traditional cost function is redeveloped as a sliding mode control stability term, and the selection of the control input that satisfies the closed-loop loop stability condition is ensured. The robustness performance of the system is improved, and a better steady-state performance is achieved. The proposed control strategy is proved using a hardware setup including a six-phase 30 spatially shifted induction motor and nine-switch converter prototype. The experimental results demonstrate that a secured sixphase induction motor operation is guaranteed while improving the closedloop robustness.

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Leakage Current Suppression and Balance Control of Neutral Point Potential for Three‐Level Inverter

Meng,

Min,

Shi

2024

Circuit Theory & Apps

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Nonisolated three‐level inverter has the problem of leakage current and neutral‐point (NP) potential imbalance in photovoltaic grid‐connected system. Therefore, a new subregional vector‐optimized modulation strategy is proposed, which can be adopted to achieve leakage current suppression and NP potential balance control in full power factor and the range of full modulation ratio. First, a system model is established for the three‐level grid‐connected inverter to analyze the mechanism of leakage current and the factors affecting the NP potential. Aiming at the shortcomings of existing modulation strategies, the three‐level space vector modulation region is redivided, and different voltage vector preselection methods are used in different modulation regions, reduced computing power. In addition, controlling the balance of NP potential, the effect of dead zone effect on the leakage current is further analyzed and improved on the basis of the proposed strategy. Finally, the proposed strategy is compared with the traditional space vector pulse width modulation strategy. The experimental results show that the proposed control strategy suppresses the leakage current below 300 mA and can effectively control the NP potential shift and eliminate the midpoint potential fluctuation. Meanwhile, the control strategy is low in computation and fast in seeking the optimum.

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Model predictive direct power control strategy for leakage current suppression on a grid‐connected three‐level inverter

Cited by 3 publications

References 17 publications

Topology Optimization Analysis of Leakage Current Suppression in Three-Level Four-Leg Photovoltaic Grid-Connected Inverter

Topology Optimization Analysis of Leakage Current Suppression in Three-Level Four-Leg Photovoltaic Grid-Connected Inverter

Model predictive sliding mode control of six‐phase induction motor using nine‐switch converter

Leakage Current Suppression and Balance Control of Neutral Point Potential for Three‐Level Inverter

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