Output Filter Design for Grid-Tied Cascaded Multi-Level Inverters Based on Novel Mathematical Expressions

Solatialkaran, Davood; Khajeh, Kiarash Gharani; Zare, Firuz

doi:10.1109/access.2020.2984792

Cited by 17 publications

(7 citation statements)

References 32 publications

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“…Filter inductance (L f lt ) can be designed from the permissible current ripple in the output as given below 27 :…”

Section: Filter Parametersmentioning

confidence: 99%

“…Filter inductance (L

_{f l t}

) can be designed from the permissible current ripple in the output as given below 27 :

\begin{matrix} right L_{f l t} & left = \frac{V_{d c}}{8 {(N - 1)}^{2} f_{s w} Δ i_{a c, \max}} \end{matrix}

where N is the total number of output voltage levels, f

_{s w}

is the switching frequency, and

normalΔ {normali}_{a c, m a x}

is the maximum ripple in the output current. The cut‐off frequency (f

_{s w}

) requirement determines the filter capacitance (C

_{f l t}

) size, as given below

C_{f l t} \geq \frac{1}{4 π f_{cutoff}^{2} L_{flt}}

…”

Section: Component Selection Guidelinesmentioning

confidence: 99%

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A single‐phase seven‐level buck‐boost common ground transformerless inverter for grid‐connected photovoltaic system

Agrawal,

Rage,

Sahoo

et al. 2023

Circuit Theory & Apps

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Transformerless inverters have recently gained attention in view of their economic benefits and compactness for photovoltaic (PV) systems. However, the limited voltage regulation and common‐mode (CM) leakage current are major concerns in conventional transformerless PV inverters. This paper presents a single‐phase seven‐level buck‐boost common ground transformerless inverter (SLB2CGTLI) to achieve a wide range of output voltages and zero leakage current without any additional stages, respectively. The proposed converter utilizes switched capacitor (SC) cell to buck‐boost the input DC voltage and generates seven‐level voltage at the output terminals. A simple reconfiguration strategy is adopted in the switched capacitor cell to maintain the charge‐second balance across the capacitors. Moreover, the common ground between the AC grid neutral and the PV panel's negative terminal mitigates the leakage current completely. The theoretical steady state analysis for both buck and boost mode is presented and verified with simulation using MATLAB Simulink. The performance of the proposed inverter is analyzed and validated with experimental results by developing a laboratory prototype. Further, the dynamic response of the proposed converter is carried out using OP4510 real‐time simulator for the grid‐connected PV application.

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“…Filter inductance (L f lt ) can be designed from the permissible current ripple in the output as given below 27 :…”

Section: Filter Parametersmentioning

confidence: 99%

“…Filter inductance (L

_{f l t}

) can be designed from the permissible current ripple in the output as given below 27 :

\begin{matrix} right L_{f l t} & left = \frac{V_{d c}}{8 {(N - 1)}^{2} f_{s w} Δ i_{a c, \max}} \end{matrix}

where N is the total number of output voltage levels, f

_{s w}

is the switching frequency, and

normalΔ {normali}_{a c, m a x}

is the maximum ripple in the output current. The cut‐off frequency (f

_{s w}

) requirement determines the filter capacitance (C

_{f l t}

) size, as given below

C_{f l t} \geq \frac{1}{4 π f_{cutoff}^{2} L_{flt}}

…”

Section: Component Selection Guidelinesmentioning

confidence: 99%

A single‐phase seven‐level buck‐boost common ground transformerless inverter for grid‐connected photovoltaic system

Agrawal,

Rage,

Sahoo

et al. 2023

Circuit Theory & Apps

View full text Add to dashboard Cite

show abstract

“…For example, these harmful sub-products sometimes cause a failure of winding insulations and leak current in motor drive applications [4]- [6]. The noise issue has a significant effect on the performance of systems, a filter design is still important to eliminate such noise and harmonics even in the case of using multi-level converters [7] [8]. Due to the advent of widebandgap (WBG) devices with fast switching characteristics, this issue is spotlighted.…”

Section: A Backgroundmentioning

confidence: 99%

Systematization of a Multilevel-Topology-Based Linear Amplifier Family for Noiseless DC–AC Power Conversion

Obara¹,

Ohno

Kawamura

2021

IEEE Access

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Electrical power converters use semiconductor switching devices for larger loss reduction compared with non-switching power linear amplifier such as a class-B amplifier. However, it is well known that the switching operation produces harmonics and EMI noise, thus passive components are usually required for the suppression of these harmful sub-products. Use of recent fast power devices such as silicon carbide (SiC) and gallium nitride (GaN) devices produce larger dv/dt and di/dt than that of Si power devices and as a result above mentioned problem becomes more tangible. In this paper, the authors propose a concept of a family of multi-level linear amplifier (MLLA), which makes no switching power conversion possible. MLLA consist of series-connected switching devices and only one of them operates as a linear amplifier and the loss is much less than that of the class-B amplifier. The concept of the family is very useful when a proper MLLA topology might be selected for applications. In this paper, three kinds of MLLA-diode-clamped linear amplifier (DCLA), flying-capacitor linear amplifier (FCLA), and novel modular-cascaded linear amplifier (MCLA)-with four series connection of devices are investigated for the viewpoint of merits and demerits clarification and the efficiency over 82 % is demonstrated in the experiments.INDEX TERMS DC-AC power conversion, high efficiency, linear amplifier, multi-level power converter, power electronics.

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“…This topology processes the power twice (two-stage inverters), which are extensively studied and adds many limitations for the component count and the control complexity. During the last decade, many topologies have been introduced using the same approach, such as switched-capacitor based inverters [18][19][20][21][22][23][24], Z source inverters [25][26][27][28][29], and multi-level inverters [30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Single-Stage Three-Phase Grid-Tied Isolated SEPIC-Based Differential Inverter With Improved Control and Selective Harmonic Compensation

2020

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The simple circuit based on DC-DC converters is the main attractive feature of the differential inverter topologies. It has a single-stage and provides modularity and scalability. However, the Negative Sequence Harmonic Component (NSHC) generated at the output terminal may hinder its practical applications. This paper presents a single-stage three-phase isolated differential inverter based on three High-Frequency Link (HFL) transformer-based DC-DC SEPIC converters. The utilized SEPIC converters perform voltage step-up/ down capability with galvanic isolation, which is essential for Renewable Energy Sources (RES). It mitigates the Common-Mode Voltage (CMV) and ElectroMagnetic Interference (EMI). Moreover, this paper proposes a two-loop based d-q synchronous frame grid-current control to mitigate its NSHC. A Type-II compensator and simple NSHC detection circuit are proposed to enhance the inverter's stability and compensate phase-delay of the utilized SEPIC converters. NSHC detection is developed using three cascaded Low Path Filters (LPFs). A 1.6kW inverter prototype was set to validate the performance of the proposed inverter and its control. The control is implemented by the MWPE3 C6713A Expert III DSP board. The proposed topology has a maximum efficiency of 89.744 at 700W output power and 86.4% at full power. The proposed control decreases the NSHC from 40.6 % to 1.614%, which shows its accuracy and precision. Furthermore, THD is reduced from 35.61% to 4.087% and satisfy the recent grid codes (<5%). The simulation results using PSIM software, power loss distribution, and a comparison study of the proposed inverter with similar topologies are also presented.

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Output Filter Design for Grid-Tied Cascaded Multi-Level Inverters Based on Novel Mathematical Expressions

Cited by 17 publications

References 32 publications

A single‐phase seven‐level buck‐boost common ground transformerless inverter for grid‐connected photovoltaic system

A single‐phase seven‐level buck‐boost common ground transformerless inverter for grid‐connected photovoltaic system

Systematization of a Multilevel-Topology-Based Linear Amplifier Family for Noiseless DC–AC Power Conversion

Single-Stage Three-Phase Grid-Tied Isolated SEPIC-Based Differential Inverter With Improved Control and Selective Harmonic Compensation

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