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.
Almost all existing relevant literatures are focused on the multi-inverter system that only contains one type of inverter. Till now, the interactions in multi-inverter system consisting of polytype inverters have been not investigated systematically. To fill this gap, the paper is aimed at the stability study of the generic system containing multiple types of inverters. The mathematic model of interactions...
Harmonic resonances around the intersection frequency is triggered with the stability margin decreasing to zero and the system will be unstable with the stability margin reducing to be negative. For suppressing harmonics, the phase difference between the inverter admittance and grid admittance should be lower than 120° at their intersection. Based on this principle, a phase-reshaping strategy aiming...
Studies suggest that inter-area low-frequency oscillations can be damped with supplementary damping control of large-scale photovoltaic (PV) plants. Multiple-model adaptive control (MMAC) is applied as the damping strategy to deal with uncertain variations of the postdisturbance operating conditions. To reduce the scales of the model bank and the damper bank, K-means clustering algorithm is used taking...
In the paper a simple stability-equivalent single- inverter system is proposed to analyze the stability of the complex multi-inverter system. Investigation shows that the harmonic resonance even instabilities will be triggered with the increase of the paralleled inverter quantities or the grid inductance due to the interaction between the inverter admittance and the grid admittance. From the perspective...
Grid impedance brought in by transformers and transmission lines in large-scale photovoltaic (LSPV) system results in complex interactions between the plant and the grid. An equivalent model of LSPV plant containing polytype inverters is established. Influences of different types of inverters and grid impedance on grid-connected current stability are studied by root locus analysis. The increase both...
Digitally controlled system has been widely used for the multi-inverter systems. However, the effects of time delay have not been fully studied in the grid-connected large-scale photovoltaic (LSPV) systems. To address this issue, this paper develops the general Norton model for grid-connected LSPV models by adding delay module into the inverter control system model. Meanwhile, based on the model of...
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.