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This paper proposes a novel control method to realize unbalanced load power sharing in an islanded microgrid. The proposed method consists of typical real-power-frequency (P-f) and reactive-power-voltage (Q-V) droop control, virtual impedance control which only functions at fundamental negative sequence, and unbalanced-power-small-signal-frequency (SU-ωss) droop control. The typical droop control...
Multi-cell diode-capacitor/inductor based boost derived DC-DC converter provides a simple solution for high step-up voltage regulation in solar and fuel cell generation. However, many passive components increase the order of system model and complexity. Transient modeling analysis reveals that time constant of each component in diode-capacitor/inductor network is much smaller than that of other circuit...
In this paper, the stability issues of multi-module DC distributed power system are studied. Physical understanding of terminal characteristics of each module is studied. All the modules are divided into two groups (Z type and Y type) based on the different terminal property type and different equivalent circuit is selected for each group. Equivalent circuits of total system are established to analyze...
In this paper, an extensive analysis on the influence of DC side voltage to the performance of PAPF is carried out, and a specification of the DC side voltage rated value is presented. First, through equivalent circuit analysis and Fourier Transform analytical expressions, a required lowest value of DC side voltage for full compensation (a zero source current THD) is obtained for six-pulse converter...
Active power filter (APF) is one of the most effective solutions to compensate the current harmonics and to enhance the power quality in industrial application. Control is one of the key elements to their performance. This paper proposes a generalized control approach for APF, which provides a systematical way not only to analysis the regular control schemes but also develop new control schemes. Based...
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