The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents photovoltaic (PV) grid-connected power conditioning systems based on Z-source inverter. Using Z-source network, the system can work within a range of PV array output voltage wider than that of the conventional boost converter. It allows the use of the shoot-through switching state for boosting the input voltage, compensates dead-time effect which causes serious output voltage distortions...
Being able to correctly track the Maximum Power Point (MPP) of a solar array is of a paramount importance, especially when dealing with large and very large solar fields. Each deviation means - energy is not optimally harvested from the field. This is evident to the extreme, when local shading occurs. Then, locally shaded cells turn into loads on the entire array. In the past, it was offered to deal...
This paper presents a discussion on architecture-oriented assurance technology in Micro grid. We analyzed the characteristic of Micro grid from evolutional view, and proposed the concept of architecture-oriented assurance technology in Micro grid from the technology evolution and policy evolution. Technology evolution contained Function Evolution, Role Changing Autonomy and Role Coordination. Policy...
Three different current control strategies including P+Resonant controller, PI-controller in dq0-reference frame and hysteresis controller for a three-phase-four-wire solar inverter are investigated and compared concerning their influences on the leakage current at the solar array, the grid harmonics, the step response and the resulting power losses in the power devices.
Due to the stochastic characteristic of photovoltaic (PV) generation, energy storage devices are indispensable to smooth the power flow and provide the electric energy with high quality. In this paper, an integrated DC/DC converter is proposed to realize high performance interfaces for PV array, battery and load. This converter consists of a boost converter for the PV array and a buck/boost converter...
This paper presents an approach to generate three-phase multi-level AC voltage output using a switching matrix device and photovoltaic (PV) panels. The approach is based on the dynamic reconfiguration of PV panels distributed in a matrix. The principle is similar to methods used in multi-level inverters related to the technique of matrix reconfiguration. The concept is to switch in and out solar panels...
The ability to harvest all available energy from a photovoltaic (PV) array is essential if new system developments are to meet levelized cost of energy targets and achieve grid parity with conventional centralized utility power. Therefore, exercising maximum power point tracking (MPPT) algorithms, dynamic irradiance condition operation and startup and shutdown routines and evaluating inverter performance...
In the last decade, c-Si module degradation rates of <1%/year have been reported. It is unclear if this degradation rate extends directly to the string level and what is the expected statistical spread of degradation rates. Nine photovoltaic (PV) arrays totaling nearly 100 kW at Standard Reporting Conditions are currently being used at Sandia National Laboratories (SNL) primarily for inverter testing...
This work develops a maximum power point tracking (MPPT) algorithm for optimizing solar array performance that is robust to rapidly varying weather conditions. In particular, a novel extremum seeking (ES) controller, which utilizes the inverter ripple, is designed and tested on a simulated array with grid-tied inverter. The new algorithm is benchmarked against the perturb and observe (PO) method using...
A novel maximum power point tracking (MPPT) method for the voltage-mode grid-connected inverter of photovoltaic generation system is proposed in this paper. The proposed MPPT method incorporated in the controller of the voltage-mode grid-connected DC/AC inverter is used to track the maximum power of solar cell array by monitoring the output voltage of the solar cell array. The main feature of the...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.