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Conventional photovoltaic (PV) power system connects hundreds and thousands of solar cells to form the PV array to match the power and voltage rating. It has been reported that any mismatch among cells results in significant power loss. PV modular level parallel inverter (MLPI) has attracted significant research attention in order to address the issue and improve system reliability. The MLPI requires...
The key drivers for Maximum Power Point Tracking (MPPT) solutions in photovoltaic (PV) power plants are independency from solar panels, fast tracking of irradiance and temperature variations, and efficiency of conversion capacity. In the most available MPPT solutions, some issues such as high implementation burden and performance degradation during abrupt changes have not been sufficiently investigated...
In the operation of a photovoltaic system, one of the most important issues is absorbing maximum power from the PV array under continuous and rapid changing irradiance condition. The sampling points obtained at different moments are not on the PV characteristic curve with the same irradiance, so the MPPT strategy may misjudge. In this paper, a novel method to track the MPP is presented, which is based...
Anew control strategy to achieve high performance from solar photovoltaic system using single stage inverter interfacing grid without maximum power point tracking (MPPT) techniques is investigated in this paper. Sinusoid-tracking algorithm and adaptive filter is proposed to improve the power quality and to regulate constant AC voltage at the point of common coupling (PCC). Proportional integral controllers...
In this paper, the single-stage Maximum Power Point Tracking (MPPT) control strategy for the Aalborg photovoltaic inverter is presented. Aalborg inverter has many advantages, such as high efficiency, wide range of input voltage, minimum voltage drop of the filtering inductors, etc. Nevertheless, it is essentially a “half-bridge” inverter with two input sources, where one source works in MPPT mode,...
Cascaded or distributed module-level inverters are becoming increasingly desirable for photovoltaic applications. The authors have demonstrated an AC-stacked topology that allows each inverter to operate completely autonomously from all the others. The only required communications is a low-bandwidth synchronization signal communicated from the point-of-grid-connection. This paper describes the communications...
Owing to economic aspects, Central inverter is the dominating candidate in large scale PV installations despite its lower energy harvest compared to other topologies like string inverters especially under partial shading conditions. In this paper a new voltage balancing topology is introduced to enable better energy yield from central inverters. The proposed topology is characterized by its fractional...
Grid-tied Photovoltaic (PV) inverters are required to have harmonics mitigation control to reduce harmonics distortion on the output current caused by the impact of grid background harmonics. In this paper, a decentralized control strategy for reduction of the impact of distorted grid voltage on the AC-stacked PV inverter architecture is proposed. Two control schemes with the selective harmonics mitigation...
This paper presents a power pulsation decoupling strategy for a two-stage single-phase photovoltaic (PV) inverter with film capacitor, which has small capacitance and large voltage ripple. Such large voltage ripple at DC bus is propagated to the PV array and decreases the maximum power point tracking (MPPT) efficiency. To maintain the MPPT efficiency, a new small-signal model which considers the DC...
The three-level T type inverter has been extensively used in photovoltaic (PV) generation. Various PV panels in cascaded connection normally require unequal dc voltage to accomplish separate maximum power point tracking (MPPT). This paper proposes a DPWM-controlled three-level T type inverter for two strings of PV panels in cascaded connection. The proposed modulation is developed based on the so-called...
In order to enable a more wide-scale utilization of PV systems, the cost of PV energy has to be comparable with other energy sources. Oversizing the PV array is one common approach to reduce the cost of PV energy, since it increases the PV energy yield during low solar irradiance conditions. However, oversizing the PV array will increase the loading of PV inverters, which may have undesired influence...
To improve light load efficiency, a three-phase photovoltaic (PV) based microinverter may operate in single-phase, two-phase or three-phase mode depending on the available input power. Therefore, its DC link capacitor may be subjected to large peak-to-peak voltage ripple when operating in phase skipping mode. This paper determines the minimum value of the DC link capacitor by allowing the maximum...
This paper focuses on the relevant content of the MVDC-connected photovoltaic system based on the modular cascaded structure. This paper proposes a new topology for the DC grid-connected photovoltaic system with a novel capacitor voltage balancing control strategy, including the module input power ratio feed forward and module capacitor voltage closed-loop control. The proposed control strategy is...
Nowadays capacity of the photovoltaic systems in the grid is remarkable and provides a major part of energy in the grid. Therefore, an abruption of these systems from the grid can create a damage to the grid. Unlike in the past that PV systems disconnected from the grid when a voltage drop occurred, nowadays these systems should have Low Voltage Ride-Through (LVRT) capability. The PV system should...
A highly land-area-efficient solar array structure named “F Solar Package Type-M” was developed and evaluated based on the actual data in “F Nagara Solar Power Plant”. This package shows better power generation performance and return on investment than a conventional system configuration. A PV power plant using this package becomes more cost-effective and is expected to spread widely because the price...
A robust sliding mode controller (SMC) for a grid-connected photovoltaic inverter is proposed in this paper. The objective of the control is to force both the output voltage of the PV source and the grid power factor at the inverter output to follow a certain trajectory reference. The robust sliding mode controller is applied directly to the nonlinear state model of the system composed by the PV source...
The paper presents new trends in the development photovoltaic (PV) power plants, with particular reference on new inverter concept with DC-link voltage over 1000 V. For the inverters with the DC-link voltage reaching the value of 1500 V, basic and most important features will be presented. The principle of appropriate PV panel configuration selection in accordance with the inverter voltage input level...
This paper presents the effectiveness of the basic Active Power Curtailment (APC), also known as Constant Power Generation (CPG) or Power Feed-in Control (PFIC), of a 6.3 kW grid-connected photovoltaic (PV) system in the voltage enhancement at the point of connection through the real-world on-site testing results. The basic APC is able to limit the range of voltage fluctuation at the point of connection...
The increasing penetration of renewable energy systems force the grid-connected power converters to use advanced active power controls, which needs to add more functionalities to their control strategies. A power reserve control is being required for grid support capabilities on Renewable Energy Sources (RES). Classical algorithms as the Maximum Power Point Tracking (MPPT) cannot withstand power reserve...
Considering the new challenges in the energetic scenario around the world, this paper proposes the implementation of a micro-grid with photovoltaic generation and local accumulation, considering its capability to operate connected or islanded from the utility grid. The system will supply power to utility grid and local loads through six single-phase inverters in wye configuration, three of them operating...
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