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In this paper, an improved control strategy for three-phase inverter is proposed, which ensures three-phase output voltage symmetry under unbalanced grid voltage. Firstly, the positive and negative sequence separation module is used to obtain unbalance output voltage and current during the grid faults. By calculating output power of the inverter, an improved P-ƒ, Q-U and Q-G droop control strategy...
For the islanded microgrid which is connected with nonlinear loads, an effective harmonic sharing method should be designed to guarantee the system stable operation. In this paper, a novel method of virtual impedance and PCC voltage compensation are proposed to achieve the harmonic sharing and voltage quality improvement at the point of common coupling (PCC). The fundamental and each harmonic currents...
This paper proposes an improved distributed secondary control scheme for dc microgrids (MGs), aiming at overcoming the drawbacks of conventional droop control method. The proposed secondary control scheme can remove the dc voltage deviation and improve the current sharing accuracy by using voltage-shifting and slope-adjusting approaches simultaneously. Meanwhile, the average value of droop coefficients...
In recent years, with the promotion and application of photovoltaic (PV) technology, research on grid-connected inverters incorporating with weak grid has become a hot field. In general, the large grid impedance will reduce the gain and bandwidth of the control system and slow down the dynamic response, or even lead to resonance and instability of the whole control system. Especially, when the grid...
Low short circuit capacity and high grid impedance are the main electrical characteristics of weak grid, and there are some stability and power quality problems with a large number of PV power generation systems incorporated into weak grid. The increasing penetration of PV power generation easily lead to voltage rise at the end of grid, and it affects the ability of weak grid to accept PV power capacity...
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