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In this paper, a virtual synchronous generator with photovoltaic energy storage hybrid system (VSG-PV) is adopted. VSG-PV can not only output the maximum power of photovoltaic, but also can maintain a stable voltage and frequency of the point of common coupling when system worked in the island model comparing to the conventional photovoltaic generation system. The small signal model of the hybrid...
In this paper, we present a theoretical and experimental study about the carrying capacity of flight dielectric elastomer (DE) balloon in electromechanical performance. This paper deals with some structures which are consist of helium balloons or air balloons based on theoretical analysis. We compared the two kinds of gas balloons at the same initial pressure, air and helium, there was no great difference...
In recent years, with the rapid development of renewable energy, power energy storage has become a bottom neck of its development, and superconducting magnetic energy storage (SMES) seems to be a viable solution. A topology based on common DC voltage bus is proposed for high power voltage source converter (VSC)-SMES. The mathematical model of SMES is constructed and the detailed control strategy is...
Aimed at the problem that the photovoltaic grid inverter output asymmetry current in the case of the grid voltage unbalance of the micro-grid, through the analysis of the inverter output characterization under the unbalanced conditions.Adopt double-loop dq control to carry out positive and negative sequence separation, respectively positive and negative sequence current are feedforward decoupling...
The mathematic model of three-phase pulse-width modulated (PWM) voltage rectifiers is nonlinear, strong coupling. And the mathematic model error, time-varying uncertainties and external disturbance will influence the performance of the system. This paper presents a linear quadratic regulator (LQR) for the inner current loop control without decoupling, and a robust H∞ control method for the outer voltage...
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