Leakage current suppression and common -mode resonance active damping for LCCL-filtered transformerless three-phase PV inverter

2019 ◽  
Author(s):  
Cun Wang ◽  
Rende Zhao ◽  
Poh Chiang Loh ◽  
Hailiang Xu ◽  
Qingzeng Yan
Keyword(s):  
Leakage Current ◽  
Active Damping ◽  
Common Mode ◽  
Pv Inverter ◽  
Three Phase

scholarly journals Three-Phase Transformerless Inverter for Photovoltaic Grid Connected System with Zero Common Mode Noise

2021 ◽  
Vol 19 ◽  
pp. 137-142
Author(s):  
K. Karam ◽  
◽  
M. Badawi El Najjar ◽  
M. El Hassan
Keyword(s):  
Leakage Current ◽  
Single Phase ◽  
Common Ground ◽  
Phase System ◽  
Common Mode ◽  
Overall Design ◽  
Modulation Technique ◽  
Pv Inverter ◽  
Three Phase ◽  
Major Factors

The pervasion of transformerless grid connected photovoltaic (PV) inverters has triggered the concerns of many researchers since it can induce power quality problems. In these types of applications, the generation of common mode (CM) leakage current is one of the major factors that affects the reliability of the overall design. In single-phase systems, the concept of the common ground between the PV negative terminal and the neutral point of the grid is the only topology that “totally” cancels this CM noise. However, none of the existing three-phase inverter techniques is able to totally remove it. Therefore, this paper proposes a three-phase PV inverter based on the concept applied in the single-phase system in order to achieve, for the first time, a zero CM noise in three-phase grid-connected PV applications. The proposed inverter is simulated with a PV array, appropriate modulation technique, corresponding inverter controller, and a three-phase Y-connected alternating current (AC) grid voltage. The simulation of the overall system is done using Matlab/Simulink software. As compared with results of existing three-phase topologies, this is the only three-phase transformerless PV inverter technique that offers generation of multilevel output, total elimination of leakage current flow, simple inverter structure, and uncomplicated modulation technique.

scholarly journals Common mode behavior in grid connected DC and AC decoupled PV Inverter topologies

2016 ◽  
Vol 65 (3) ◽  
pp. 481-493 ◽  
Author(s):  
D. John Sundar ◽  
M. Senthil Kumaran
Keyword(s):  
Leakage Current ◽  
High Efficiency ◽  
Economic Feasibility ◽  
Photovoltaic Systems ◽  
Common Mode ◽  
Pv Inverter ◽  
Mode Behavior ◽  
The Common ◽  
Utility Grid ◽  
The Impact

Abstract The transformer-less grid connected inverters are gaining more popularity due to their high efficiency, very low ground leakage current and economic feasibility especially in photovoltaic systems. The major issue which surfaces these systems is that of common mode leakage current which arises due to the absence of an electrical transformer connected between the inverter and the utility grid. Several topologies have evolved to reduce the impact of common mode leakage current and a majority of them have succeeded in eliminating the impacts and have well kept them within the limits of grid standards. This paper compares and analyses the impact of the common mode leakage current for four popular inverter configurations through simulation of the topologies such as H5, H6, HERIC and FBZVR inverters.

scholarly journals Impact Of Common Mode Signal Injection On The Leakage Current Of A Grid-connected Transformerless Pv Inverter

2016 ◽  
Vol 21 (4) ◽  
pp. 296-304
Author(s):  
Cassiano Rech ◽  
Julian Giacomini ◽  
Leandro Michels ◽  
Humberto Pinheiro
Keyword(s):  
Leakage Current ◽  
Common Mode ◽  
Pv Inverter ◽  
Signal Injection

Dual-Segment Three-Phase PMSM With Dual Inverters for Leakage Current and Common-Mode EMI Reduction

2019 ◽  
Vol 34 (6) ◽  
pp. 5606-5619 ◽  
Author(s):  
Zewei Shen ◽  
Dong Jiang ◽  
Tianjie Zou ◽  
Ronghai Qu
Keyword(s):  
Leakage Current ◽  
Common Mode ◽  
Three Phase ◽  
Emi Reduction

scholarly journals A Three-Phase Transformerless T-Type- NPC-MLI for Grid Connected PV Systems with Common-Mode Leakage Current Mitigation

Energies ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 2434 ◽  
Author(s):  
P. Madasamy ◽  
V. Suresh Kumar ◽  
P. Sanjeevikumar ◽  
Jens Bo Holm-Nielsen ◽  
Eklas Hosain ◽  
...  
Keyword(s):  
Leakage Current ◽  
High Efficiency ◽  
Current Control ◽  
Switching Function ◽  
Switching Frequency ◽  
Main Concern ◽  
Common Mode ◽  
Grid Interface ◽  
Three Phase ◽  
Pv Grid

DC to AC inverters are the well-known and improved in various kinds photovoltaic (PV) and gird tied systems. However, these inverters are require interfacing transformers to be synchronized with the grid-connected system. Therefore, the system is bulky and not economy. The transformerless inverter (TLI) topologies and its grid interface techniques are increasingly engrossed for the benefit of high efficiency, reliability, and low cost. The main concern in the TL inverters is common mode voltage (CMV), which causes the switching-frequency leakage current, grid interface concerns and exaggerates the EMI problems. The single-phase inverter two-level topologies are well developed with additional switches and components for eliminating the CMV. Multilevel inverters (MLIs) based grid connected transformerless inverter topology is being researched to avail additional benefits from MLI, even through that are trust topologies presented in the literature. With the above aim, this paper has proposed three -phase three-level T type NP-MLI (TNP-MLI) topology with transformerless PV grid connected proficiency. The CM leakage current should handle over mitigating CMV through removing unwanted switching events in the inverter pulse width modulation (PWM). This paper is proposes PV connected T type NP-MLI interface with three-phase grid connected system with the help of improved space vector modulation (SVM) technique to mitigate the CM leakage current to overcome the above said requests on the PV tied TL grid connected system. This proposed the SVM technique to mitigate the CM leakage current by selecting only mediums, and zero vectors with suitable current control method in order to maintain the inverter current and grid interface requirements. The proposed PV tied TNP-MLI offering higher efficiency, lower breakdown voltage on the devices, smaller THD of output voltage, good reliability, and long life span. The paper also investigated the CM leakage currents envisage and behavior for the three-phase MLI through the inverter switching function, which is not discussed before. The proposed SVM on TL-TNP-MLI offers the reliable PV grid interface with very low switching-frequency leakage current (200mA) for all the PV and inverter operation conditions. The feasibility and effectiveness of the TLI and its control strategy is confirmed through the MATLAB/Simulink simulation model directly as compared with 2kW roof top PV plant connected TL-TNP-MLI experimentation, showing good accordance with theoretical investigation. The simulation and experimental results are demonstrated and presented in the good stability of steady state and dynamics performances. The proposed inverter reduces the cost of grid interface transformer, harmonics filter, and CMV suppressions choke.

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