This paper provides a novel hierarchical control for VSI-based microgrids. The advantage of the provided control scheme is to maintain the frequency and voltage stability and load sharing against large-signal disturbances. A hierarchical control, consisting of three levels, is described. A new control loop based on PI controller, is presented. The new control loop has a great impact on increasi...

The droop-based control schemes are widely used for power-sharing and of the isolated microgrids. conventional droop scheme with inner current voltage controllers can work effectively under ideal voltage. However, existence unbalance tends its performance to worsen. This paper aims propose an enhanced method improve power-sharing, maintain distributed generators’ (DGs) terminal voltages system ...

The origin of follicular dendritic cells (FDC) is unresolved, and as such, remains controversial. Based on the migration of Ag-transporting cells (ATC) into lymphoid follicles and the phenotypic similarity between FDC and ATC, one hypothesis is that ATC may represent emigrating FDC precursors. This contrasts with the view that FDC originate from local stromal cells in the secondary lymphoid tis...

One of the most critical operations aspects is power management strategies for hybrid AC/DC microgrids. This work presented in AC–DC microgrids with a droop control strategy. At first, photovoltaic, Wind, and battery are used as sources, which supply uncertainties. The AC DC controlled by an Adaptive neuro-fuzzy inference system (ANFIS) controller Proportional Integral Derivative (PID) controll...

Decentralized control strategies are popular candidates in microgrids control because of their reliability and performance. Conventionally, droop control (as a main decentralized strategy) is been utilized in order to prevent permanent droop of voltage and frequency after change in loads and also to share generated power between distributed generation units. In this paper, a new droop control s...

The efficiency droop in GaInN/GaN multiple-quantum well MQW light-emitting diodes is investigated. Measurements show that the efficiency droop, occurring under high injection conditions, is unrelated to junction temperature. Furthermore, the photoluminescence output as a function of excitation power shows no droop, indicating that the droop is not related to MQW efficiency but rather to the rec...

Follicular dendritic cells (FDC) are specialized antigen-presenting cells to cognate B cells in the follicle of the lymphoid tissues. FDC also support survival and proliferation of the B cells, leading to the germinal center formation. FDC therefore play a central role in humoral immune responses. However, molecular and functional characteristics of FDC are largely unknown, because it is diffic...

Purpose: To establish the method for the analysis of rifampin quinone and hydrazone in fixeddose combination tablets (FDC) containing rifampicin with or without sodium ascorbate as an additive. Methods: The International Pharmacopoeial (IP) method for the estimation of rifampin quinone in FDC was modified. The extraction solvent (methanol/buffer mixture) of the IP method was replaced with ethyl...

Conventional droop control is a basic control strategy for power sharing in islanded microgrid applications. This strategy has several limitations, such as low transient response, frequency and voltage deviations. This paper presents a modified droop control method for the proper operation of parallel-connected inverters in islanded microgrid. The proposed method is able to improve transient re...

Decentralized control strategies are popular candidates in microgrids control because of their reliability and performance. Conventionally, droop control (as a main decentralized strategy) is been utilized in order to prevent permanent droop of voltage and frequency after change in loads and also to share generated power between distributed generation units. In this paper, a new droop control s...