Abstract
Power inverters produce common mode voltage (CMV) and common mode current (CMC) which cause high-frequency electromagnetic interference (EMI) noise, leakage currents in electrical drives application and grid-connected systems, which consequently drops the efficiency of the system considerably. This CMV can be mitigated by designing suitable EMI filters and/or investigating the effects of different modulation strategies. In this paper, the effect of various modulation techniques over CMV and CMC are investigated for two-level and three-level inverters. It is observed that the modified third harmonic injection method reduced the CMV and CMC in the system by 60%. This modified pulse width modulation (PWM) technique is employed along with EMI chokes which results in reduced distortion of the system.
Highlights
The Photo Voltaiacs (PVs)-grid connected power inverter is a necessary part of the PV to electrical energy conversion system [1]
The simulated results show that when the modified pulse width modulation (PWM) method is implemented there is a considerable reduction in common mode current (CMC)
Of the system is observed to be reduced considerably. This satisfies the objective of optimizing the PWM technique to reduce the common mode voltage (CMV) and current in grid-tied inverters
Summary
The PV-grid connected power inverter is a necessary part of the PV to electrical energy conversion system [1]. In [16], a new scheme based on a dual CM internal loop for a PV grid-connected transformer-less system is proposed to suppress CMC high-frequency components. In [35], a new methodology called the spread spectrum (SS) technique is presented in order to reduce EMI of power converters over a wide range of frequency. In [49], controllable devices are used and active filters are presented to suppress CMC generated by the CMV method, called the active noise cancellation scheme, in order to mitigate the noise signal [50]. In [51], a new wavelet transform-based technique to mitigate EMI noise in power converter is presented with a frequency band of 3–30 MHz. In this paper, EMI mitigation techniques are investigated with the aim to reduce CMV and CMC in a PV-grid tied power inverter.
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