Minimization of leakage ground current in transformerless single-phase full-bridge photovoltaic inverters

Investigations on EMI Mitigation Techniques: Intent to Reduce Grid-Tied PV Inverter Common Mode Current and Voltage

“…In the given system, a damping resistor R CM2 is connected between grid and neutral point capacitor. Additionally, two chokes, L CM1 and L CM2 , and three Y-connected capacitors, C CM2 , are connected for filter purposes [12][13][14]. R CM1 and C CM1 are connected between the grid and negative terminal of the DC link.…”

“…In [13], the mid-point of DC and AC side voltage nodes are connected to the proposed new CM internal loop scheme in order to suppress CMC. In [14], a novel modulation scheme is presented to control inverter power switches in order to reduce CMC. In [15], a CM internal loop is formed by employing the RC branch in between the negative bus of DC and output terminals.…”

Novel Common-Mode Current Suppression Method in Transformerless PV Grid-Connected System

“…In [8], a CM internal loop is proposed by connecting the midpoint of ac side voltage to the dc side voltage point. In [9], a new modulation method is proposed for optimally controlling the power switches of transformerless single-phase full-bridge PV inverters to reduce CM current. In [10], the RC absorption branch is added between the output terminal and the dc negative bus to form a single CM internal loop.…”

“…In [10], the RC absorption branch is added between the output terminal and the dc negative bus to form a single CM internal loop. However, there is no further analysis of CM current in [8][9][10], and there is no comparative analysis of the effect of CM internal loop on the high frequency component of the CM current. Furthermore, it is easy to produce high frequency resonance in the CM circuit by using the single CM internal loop method so that the large CM current of the resonant frequency will be produced.…”