Shanmuka Naga Raju
Bipolar PWM and LCL Filter Configuration to Reduce Leakage Currents in Transformerless PV System Connected to Utility Grid
499 - 505
2018
12
6
International Journal of Energy and Power Engineering
https://publications.waset.org/pdf/10009243
https://publications.waset.org/vol/138
World Academy of Science, Engineering and Technology
This paper presents PV system without considering transformer connected to electric grid. This is considered more economic compared to present PV system. The problem that occurs when transformer is not considered appears with a leakage current near capacitor connected to ground. Bipolar Pulse Width Modulation (BPWM) technique along with filter LCL configuration in the circuit is modeled to shrink the leakage current in the circuit. The DCAC inverter is modeled using Hbridge Insulated Gate Bipolar Transistor (IGBT) module which is controlled using proposed Bipolar PWM control technique. To extract maximum power, Maximum Power Point Technique (MPPT) controller is used in this model. Voltage and current regulators are used to determine the reference voltage for the inverter from active and reactive current where reactive current is set to zero. The PLL is modeled to synchronize the measurements. The model is designed with MATLAB Simulation blocks and compared with the methods available in literature survey to show its effectiveness.
Open Science Index 138, 2018