Abstract
Dynamic states (e.g., voltage sags and swells) in the power grid can cause faults and defects in sensitive loads and in consequence financial losses. This paper deals with a flexible transformer based on bipolar direct AC/AC chopper (BD-AC). It is a combination of BD-AC and traditional power frequency transformer, and it can realize the flexible regulation of voltage amplitude and phase angle respectively according to voltage requirements. Firstly, the topology and modulation strategy of the selected BD-AC are analyzed. On this basis, the flexible transformer system topology based on BD-AC and transformer is proposed. Then, based on the structure of flexible transformer system, its working principle is analyzed in detail, and the regulation range of voltage amplitude and phase angle are quantitatively studied. Furthermore, considering the principle of voltage regulation, a triangle angle theory based control strategy is proposed. Finally, the correctness and effectiveness of the theoretical analysis of the proposed flexible transformer system are carried out by detailed computer simulation.
Highlights
With the rapid development of social economy, the electrification of daily life is growing and the demand for power quality of the end-users is increasing [1], [2]
VOLTAGE AMPLITUDE REGULATION Keeping the phase angle of the voltage as a constant, and setting symmetric scene and asymmetric scene (A-phase voltage amplitude sag 40%, B-phase voltage amplitude sag 30% and C-phase voltage amplitude swell 30%) to verify the voltage regulation capability of the flexible transformer system, respectively
A flexible transformer based on bipolar direct AC/AC chopper for flexible regulation of supply voltage, and operating as a power shifter transformer has been presented in this paper
Summary
With the rapid development of social economy, the electrification of daily life is growing and the demand for power quality of the end-users is increasing [1], [2]. In order to mitigate the adverse effects of the above reasons on the voltage quality, there are two paths leading to the protection of sensitive loads against voltage perturbation and the reduction of energy losses [11], i.e., to improve the ride-through capability of electrical devices during voltage perturbation and install voltage stabilizers to reduce voltage fluctuation. Both of the means should be developed simultaneously and independently. With the development of power electronic technology in recent years, there are various types of hybrid AC compensators used in modern
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