Research on the Comparison Analyses of Three-Phase Discrete and Integrated LC Filters in Three-Phase PV Inverter

Jiang, Ying; Li, Jianguo; Pan, Sanbo; Zhang, Xi; Hu, Peng; Zhang, Haiyan

doi:10.1155/2013/217023

Cited by 9 publications

(4 citation statements)

References 22 publications

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“…The magnetic integration technique has been adopted to solve the second issue, that is, minimizing the size and expenses of the LCL filter and its modified configurations too [24][25][26][27][28][29][30][31][32]. This technique replaces several discrete inductors with an integrated one, utilizing one magnetic core wound with various windings.…”

Section: Introductionmentioning

confidence: 99%

Magnetic integrated LLCL filter with resonant frequency above Nyquist frequency

Al-Barashi

Liu

et al. 2022

IET Power Electronics

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This paper presents a design technique of magnetic integrated LLCL filters for grid-tied inverters. With the proposed design technique, the LLCL filter's resonant frequency can be higher than the Nyquist frequency. Furthermore, the proposed concept was only reported for the LCL filter in the previous research works. In addition, the modulation process will produce dominant switching harmonics for unipolar PWM H-bridge inverters at the double switching frequency. Thus, putting the resonant frequency beyond the Nyquist frequency will increase the stability zone. The proposed design methods maximize the filter inductors' utilization and resist the grid impedance variations under weak grid conditions, depending on the improved stability zone. Comparative simulation and HIL experimental results are presented to confirm the effectiveness of the proposed magnetic integrated LLCL filter design. The HIL experimental results and the simulation results agree well with each other.

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Section: Introductionmentioning

confidence: 99%

Magnetic integrated LLCL filter with resonant frequency above Nyquist frequency

Al-Barashi

Liu

et al. 2022

IET Power Electronics

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“…In both configurations, the behavior of the inductor is defined by (11), where L a = L b = L c = L i is the selfinductance of each phase, and M is the mutual inductance between phase a, b and c. In a 3-independent inductors configuration, L i = L and M = 0. In a coupled design, the goal is to obtain L i ≈ 2L/3 and M ≈ L/3 as it was presented on [40].…”

Section: Magnetic Design Of Phase Inductorsmentioning

confidence: 99%

“…Under an ideal design with M ≈ L/3 to have the maximum coupling between phases [40], common mode inductance is reduced (L cm ≈ 0). This common mode inductance must be considered in the common mode model presented on In the case of n−o connection, it results in a high common mode ripple on the inductance, much higher than with 3independent inductors, where L cm = L/3.…”

Section: Magnetic Design Of Phase Inductorsmentioning

confidence: 99%

Magnetic Design of a 3-Phase SiC-Based PV Inverter With DC-Link Referenced Output Filter

et al. 2023

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The use of Silicon carbide (SiC) devices represents an improvement in terms of size, weight and efficiency of power converters. However, SiC-based solutions present high dv/dt and di/dt on the switching events, increasing the common-mode noise injected into the grid. To reduce the common-mode noise, three-phase inverters with a DC-link referenced output filter are widely considered in photovoltaic (PV) inverters connected to the grid. However, if the filter is DC-link referenced the inductor ripple is larger, and this must be considered for the AC inductor filter design. This work shows, on a PV inverter, the impact of that DC-link referenced filter on the current ripple of the inductor, and the improvement achieved with the use of SiC devices, increasing the switching frequency. A comparison in terms of weight, size, losses and materials costs is presented for different core materials and configurations.

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“…Three-level topology is widely used in the high-voltage high-power applications, because of the advantages of the small output harmonic content, the low switch voltage stress, the small voltage change rate (du/dt), and high efficiency of inverter. [6][7][8][9][10] Compared with the traditional neutral-point-clamped (NPC) three-level topology, T-type three-level topology has the following advantages: a small number of diodes, high efficiency, and low power loss. 9,10 The modulation and control strategies have been the research focus in the three-phase inverter system.…”

Section: Introductionmentioning

confidence: 99%

High performance of three-level T-type grid-connected photovoltaic inverter system with three-level boost maximum power point tracking converter

Zhou

2019

Advances in Mechanical Engineering

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A three-phase three-level transformerless T-type grid-connected inverter system with three-level boost maximum power point tracking converter is introduced in this article for high-voltage high-power applications. First, the mathematical model of grid-connected photovoltaic inverter system is built. Second, a multiloop interleaved control scheme is proposed for three-level boost maximum power point tracking converter to reduce the ripple of the inductor current and balance the capacitor voltage of DC bus. A predictive current control method and a power feedforward strategy are also proposed for the T-type three-level inverter part to reduce the harmonic content of grid-connected current and to improve the dynamic response of the system, respectively. In order to solve complex algebraic computation of traditional space vector pulse width modulation or multi-carrier pulse width modulation method, a single-carrier pulse width modulation method is presented for T-type three-level inverter. Finally, all control strategies and modulation method are implemented on a single-chip digital signal processor. A high conversion efficiency, low cost, and low harmonic current could be obtained on a 23-kW experimental prototype.

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Research on the Comparison Analyses of Three-Phase Discrete and Integrated LC Filters in Three-Phase PV Inverter

Cited by 9 publications

References 22 publications

Magnetic integrated LLCL filter with resonant frequency above Nyquist frequency

Magnetic integrated LLCL filter with resonant frequency above Nyquist frequency

Magnetic Design of a 3-Phase SiC-Based PV Inverter With DC-Link Referenced Output Filter

High performance of three-level T-type grid-connected photovoltaic inverter system with three-level boost maximum power point tracking converter

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