Extended Bandwidth Instantaneous Current Sharing Scheme for Parallel UPS Systems

Comprehensive review on control strategies of parallel‐interfaced voltage source inverters for distributed power generation system

“…Consequently, a suitable control strategy is required to make certain, the equal current sharing among the inverters. The controller, therefore, needs to fulfil the following objectives [22–26]: Module synchronisation. Improved load sharing. Obtain the desired output voltage. The controller should be able to employ proper current sharing amongst the parallel inverters, to protect any particular inverter from overheating. Minimum communication lines between the inverters to ensure better reliability. The performance of the controller should not differ with an increase or decrease in the number of inverters connected in parallel. The current/power‐sharing control topologies of parallel‐connected inverters are broadly classified as wired [27–53] or wireless controllers [25, 37, 54–133]. Although the wired controllers ensure efficient power‐sharing between the parallel‐connected inverters, yet, the presence of inter‐communication link between them makes the operation less reliable.…”

“…Double-loop voltage IACS: Fig. 8a depicts the continuous time model of double-loop voltage IACS control, for the control of the Pth parallel-connected inverter [37][38][39].…”

Lithium Titanate Battery Management System Based on MPPT and Four-Stage Charging Control for Photovoltaic Energy Storage

“…In a photovoltaic energy storage system, the low voltage of the photovoltaic PV input board is boosted to a bus voltage of 400 V via an interleaved parallel boost circuit, and a large-capacity electrolytic capacitor is connected in parallel to the busbar for power buffering and decoupling [7][8][9]. The 400 V bus voltage then charges the lithium battery through a full-bridge soft-switch circuit for photovoltaic energy storage.…”

“…In off-grid and grid-connected applications, fluctuations in photovoltaic power will lead to reliability and safety issues; thus, solutions to stabilize the fluctuation are necessary. The currently available technologies include energy storage, power reduction, and integration with other energy sources; among these technologies, energy storage is a relatively developed solution [6][7][8]. Employing large-capacity energy storage technology has become mandatory for the grid connection of distributed photovoltaic power generation, and is an important basis for the future construction of smart power grids.…”

Optimal configuration of a power grid system with a dynamic performance sharing mechanism

“…As power production may be influenced by the state of generators and the demand may also vary, the power produced in a district may not be able to satisfy its power demand (Faza, 2017). In light of this, the performance sharing mechanism is essential such that the districts with sufficient power supply can share the redundant power with the districts with deficient power supply (Tolani ＆Sensarma, 2017). The power grid system can be regarded reliable as long as the demands of all the districts can be satisfied after proper power redistribution.…”