A Simple Differential Mode EMI Suppressor for the &lt;inline-formula&gt; &lt;tex-math notation="TeX"&gt; $LLCL$&lt;/tex-math&gt;&lt;/inline-formula&gt;-Filter-Based Single-Phase Grid-Tied Transformerless Inverter

Ji, Junhao; Wu, Weimin; He, Yuanbin; Lin, Zhe; Blaabjerg, Frede; Chung, Henry Shu-Hung

doi:10.1109/tie.2014.2385666

Cited by 39 publications

(6 citation statements)

References 40 publications

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“…Furthermore, current harmonic distortion of the grid-connected power inverter must be considered because of the power quality requirement in the power grid. In addition to the power quality of the power grid, another important issue is the conducted electromagnetic interference (EMI), which is mainly generated by the high frequency transistor switching and parasitic components in the noise conduction path [13][14][15]. Mostly, the EMI noise in the DC side of the inverter is suppressed to meet the EMI standard [16].…”

Section: Introductionmentioning

confidence: 99%

LCL Filter Design with EMI Noise Consideration for Grid-Connected Inverter

Liu

Lai

2018

Energies

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The grid-injected current total harmonics distortion (THD) and electromagnetic interference (EMI) noise must be considered in a transformer-less grid-connected inverter for a more electric aircraft (MEA) system. This paper develops a procedure for the design of the magnetic components of the LCL filter used in harmonic control and EMI reduction of the silicon carbide (SiC) grid-connected inverter in the MEA. The LCL filter is designed with effective harmonic attenuation and a compact size. To meet the space constraint requirement, specific design attention is focused on a customized amorphous cored inductor, with a comprehensive study of the relationships of inductor winding with respect to EMI noise. Reduced THD and EMI are verified through experiments performed on a 30 kW, 230 V/400 Hz three-phase grid-connected inverter prototype with the LCL filter.

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Section: Introductionmentioning

confidence: 99%

LCL Filter Design with EMI Noise Consideration for Grid-Connected Inverter

Liu

Lai

2018

Energies

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“…This circuit is formed by the inverter and its output filter, the existing ground impedance Z GcGg and the parasitic capacitance C PVg between the PV panel and ground, as shown in Figure 1 [2,3,5]. This leakage current affects system efficiency, deteriorates the distortion of the grid current and the electromagnetic compatibility (EMC), and may cause security issues [5][6][7][8][9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

“…deteriorates the distortion of the grid current and the electromagnetic compatibility (EMC), and may cause security issues [5][6][7][8][9][10][11][12][13][14][15][16][17]. According to [2,3], VCM is defined as:…”

Section: Introductionmentioning

confidence: 99%

A Transformerless Single-Phase Current Source Inverter Topology and Control for Photovoltaic Applications

et al. 2018

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Low power grid-tied photovoltaic (PV) generation systems increasingly use transformerless inverters. The elimination of the transformer allows smaller, lighter and cheaper systems, and improves the total efficiency. However, a leakage current may appear, flowing from the grid to the PV panels through the existing parasitic capacitance between them, since there is no galvanic isolation. As a result, electromagnetic interferences and security issues arise. This paper presents a novel transformerless single-phase Current Source Inverter (CSI) topology with a reduced inductor, compared to conventional CSIs. This topology directly connects the neutral line of the grid to the negative terminal of the PV system, referred as common mode configuration, eliminating this way, theoretically, the possibility of any leakage current through this terminal. The switches control is based on a hysteresis current controller together with a combinational logic circuitry and it is implemented in a digital platform based on National Instruments Technology. Results that validate the proposal, based on both simulations and tests of a low voltage low power prototype, are presented.

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“…Certainly, a resonant inductor in the capacitor loop of the LLCL-filter causes the electromagnetic interference (EMI) issue. Some research have put forward new strategies [13][14][15][16][17], which can suppress the EMI noise well at a slightly additional cost.…”

Section: Introductionmentioning

confidence: 99%

“…Note that the conventional LLCL-filter or the modified types [13][14][15][16][17] are designed for a voltage source grid-tied inverter. However, the Aalborg inverter is a hybrid source inverter and it shows the characteristic of a current source inverter, when it works in the 'boost' state [9].…”

Section: Introductionmentioning

confidence: 99%

Modelling of the modified‐LLCL‐filter‐based single‐phase grid‐tied Aalborg inverter

Liu

Yuan

et al. 2017

IET Power Electronics

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Owing to less conduction and switching power losses, the recently proposed Aalborg inverter has high efficiency within a wide range of input DC voltage for single-phase DC/AC power conversion. In theory, the conduction power losses can be further decreased, if an LLCL-filter is adopted instead of an LCL-filter for a voltage source inverter, mainly due to the reduced inductance. The Aalborg inverter shows the characteristic of a current source inverter, when working in the 'boost' state. Whether the LLCL-filter can meet the control requirement of this type inverter needs to be further explored. In this study, the small signal analysis for the modified-LLCL-filter-based Aalborg inverter is addressed. Through the modelling, it can be proven that compared with the LCL-filter, the modified-LLCL-filter causes no extra control challenge for the Aalborg inverter, and therefore more inductance in the power loop can be safely saved as well as a complete smaller filter size. A 220 V/50 Hz, 2000 W prototype is used to demonstrate the theoretical analysis.

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A Simple Differential Mode EMI Suppressor for the <inline-formula> <tex-math notation="TeX"> $LLCL$</tex-math></inline-formula>-Filter-Based Single-Phase Grid-Tied Transformerless Inverter

Cited by 39 publications

References 40 publications

LCL Filter Design with EMI Noise Consideration for Grid-Connected Inverter

LCL Filter Design with EMI Noise Consideration for Grid-Connected Inverter

A Transformerless Single-Phase Current Source Inverter Topology and Control for Photovoltaic Applications

Modelling of the modified‐LLCL‐filter‐based single‐phase grid‐tied Aalborg inverter

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