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

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 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.

Investigation of common-mode voltage and ground leakage current of grid-connected transformerless PV inverter topology

2015 ◽  
Vol 26 (1) ◽  
pp. 20-24
Author(s):  
Atanda K. Raji ◽  
Mohamed T. E. Kahn
Keyword(s):  
Solar Energy ◽  
Leakage Current ◽  
Energy System ◽  
Common Mode ◽  
System Cost ◽  
Pv Inverter ◽  
Common Mode Voltage ◽  
The Cost ◽  
Isolation Transformer ◽  
Inverter Topology

The problems of increasing electricity demand by the unabated population and economy growth can be solved by employing sustainable distributed generation technologies. Convectional primary energy sources such as coal, liquid hydrocarbons’ and natural gasses create environmental degradation and energy security problems. Even though the cost of solar energy is zero, the same cannot be said of a solar energy system. The system cost especially the initial capital investment has been hindering the rapid deployment of solar energy systems. One way of reducing the system cost of a solar energy system is to look into the constituent components and see where cost can be reduced without compromising the system efficiency and human safety. Eliminating the isolation transformer reduces the cost and increases the system overall efficiency. However, the galvanic connection between the PV array and the utility grid creates a safety problem for people and system equipment. We present a simplified model for the investigation of the common mode voltage and ground leakage current that can lead to electromagnetic interference. The leakage current level is used for the determination of the suitability of the investigated PV inverter topology for grid connection without isolation transformer.

Simultaneous Common-Mode Resonance Circulating Current and Leakage Current Suppression for Transformerless Three-Level T-Type PV Inverter System

2019 ◽  
Vol 66 (6) ◽  
pp. 4457-4467 ◽  
Author(s):  
Xiaoyan Li ◽  
Xiangyang Xing ◽  
Chenghui Zhang ◽  
Alian Chen ◽  
Changwei Qin ◽  
...  
Keyword(s):  
Leakage Current ◽  
Common Mode ◽  
Pv Inverter ◽  
Circulating Current

A Single-Phase Five-Level Transformer-Less PV Inverter for Leakage Current Reduction

2021 ◽  
pp. 1-1
Author(s):  
Xiaonan Zhu ◽  
Hongliang Wang ◽  
Wenyuan Zhang ◽  
Hanzhe Wang ◽  
Xiaojun Deng ◽  
...  
Keyword(s):  
Leakage Current ◽  
Single Phase ◽  
Pv Inverter ◽  
Current Reduction
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