Many grid connected PV installations consist of a single series string of PV modules and a single DCAC inverter. This efficiency of this topology can be enhanced with additional low power, low cost per panel converter modules. Most current flows directly in the series string which ensures high efficiency. However parallel Cúk or buck-boost DC-DC converters connected across each adjacent pair of...

The paper presents a detailed modeling and simulation of different control schemes of the real and reactive power flows in a three-phase voltage source inverter (VSI) interfacing a photovoltaic (PV) generation system to the power grid. Synchronisation of the inverter and grid AC waveforms is achieved using a phase-locked-loop (PLL) circuit. An effective decoupling strategy based on proportional...

Transformerless inverters are high efficiency inverters featuring high efficiency and lower size and weight. In this paper a topology based on H-bridge with ac decoupling scheme consisting of diode bridge and a switch with clamping to the DC midpoint is implemented. A 16V prototype of HB-ZVR inverter has been implemented in hardware using open loop control. The control pulses were generated usi...

Received Aug 27, 2014 Revised Dec 2, 2014 Accepted Dec 25, 2014 In this paper, a new control method for quasi-Z-source cascaded multilevel inverter based grid-connected photovoltaic (PV) system is proposed. The proposed method is capable of boosting the PV array voltage to a higher level and solves the imbalance problem of DC-link voltage in traditional cascaded H-bridge inverters. The proposed...

This paper describes the modeling and control of a three-phase grid-connected converter fed by a photovoltaic array. The converter is composed of an isolated DC-DC converter and a three-phase DC-AC voltage source inverter The converters are modeled in order to obtain small-signal transfer functions that are used in the design of three closed-loop controllers: for the output voltage of the PV ar...

Multilevel inverters (MLIs) have seen significant growth in a variety of medium- to high-power industrial applications and become mature viable solution for renewable energy systems over the past decade. The major concerns MLIs are high component count buck-type feature ac output voltage when used grid-connected renewable-energy-based sources such as solar photovoltaic (PV) panels. As another o...

Design challenges for grid-connected solar PV systems related to the power conditioning units are quality, efficiency, reliability, cost of implementation etc. This paper deals with single dc source-based double LDN high-resolution multilevel inverter topology appropriate blend switches address most practical constraints central application. A two-stage solution is adapted utilization as well i...

This paper proposes a vector controlled isolated source cascaded two-level inverter (CTLI), for grid connected photovoltaic (PV) system. The system is controlled to operate with variable solar irradiance, supplying different levels of active power. The PV systems are designed, modeled and tested with the proposed controller, to provide maximum power output. Additional operation as a reactive po...