Abstract
Transformerless inverters have become an important integration of the modern photovoltaic (PV) grid-tied systems. Unfortunately, it has a general safety problem regarding the earth leakage current that must be less than the recommended standards. Lately, the H7 transformerless inverter, which is a three-phase inverter with an additional switch on the DC side, is introduced to mitigate the earth leakage current. Different modulation techniques and controllers are proposed to optimize its performance. This paper proposed the application of model predictive control (MPC) to grid-connected H7 transformerless inverter supplied by the PV power system. In modeling the system, the grid inductance has been taken into consideration. The inverter is linked with the PV through a boost converter. It is found that the boost converter inductance value has a great effect on the leakage current. Matlab's simulations for the proposed system are carried out. The performance of the proposed system controlled by MPC is compared to that controlled by the proportional-integral (PI) controller. The results show that the MPC gives the system greater benefits than the PI controller. The effects of the boost-converter inductance on the earth leakage current are studied. Also, the design of the boost-converter inductance is introduced.
Highlights
Solar photovoltaic (PV) energy sources have gained great importance in recent years
This paper proposed the application of model predictive control (MPC) to grid-connected H7 transformerless inverter supplied by the PV power system
This paper proposes a PV powered H7 transformerless inverter controlled by the MPC algorithm
Summary
Solar photovoltaic (PV) energy sources have gained great importance in recent years. It is one of the most promising renewable energy sources that can meet the increasing demands of electrical energy in the future. The common advantages of the PV resources are availability everywhere, reliability, maintenance-free, no acoustic noise, long life, and no environmental pollution [1]. PV systems have become worldwide spread based on previous advantages. The PV systems may be utilized to deliver energy to the utility grid or standalone loads. Standalone PV systems are usually adapted for rural areas where the utility grid is not available. Grid-connected PV systems are preferred over standalone ones due to high efficiency, low cost, optimum utilization of PV panels, and no storage requirement [2]
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