A high-frequency multi-port (HFMP) direct current (DC) to DC converter is presented. The proposed HFMP utilized interface a photovoltaic (PV) system. presented compact and can perform maximum power point tracking. It consists of transformer with many identical input windings one output winding. Each winding connected PV module through an H-bridge inverter, the tracked using perturb observe (P&a...

Quality degradation, power loss, and fire hazards are amongst the consequences of uncleared electric faults within photovoltaic (PV) arrays. This paper proposes an effective protection method for i) detecting using current variations, ii) discriminating them from other disturbances based on transient response PV cells, iii) locating faulty string arrays with a minimal number measurement sensors...

Abstract In the process of accessing distributed power sources in microgrid, there will be serious coupling between active and reactive power, which lead to significant changes inverter outlet voltage impedance increase circulating current phenomenon. The generation accelerate aging devices, reduce efficiency, threaten stable operation system. this paper, mechanism is analysed, basic characteri...

The Cúk converter, which has voltage buck and boost ability, offers high flexibility as an interface device for solar panels. In addition, current ripple can be more reduced because of two input and output inductors at both sides. This paper presents a new application of current-variable inductors in a Cúk converter that reduces the size and capacity of storage elements. Because of two inductor...

Microgrids active characteristics such as grid-connected or islanded operation mode, the distributed generators with an intermittent nature, and bidirectional power flow in distribution lines lead to malfunction of traditional protection schemes. In this article, impedance-based fault detection scheme is proposed main microgrids by applying equivalent circuits for doubly-fed lines. scheme, rela...

< p>The restricted earth fault (REF) protection is provided for electrical power transformer in order to sense internal faults, mainly because it more sensitive than the main differential protection. However, The REF relay may maloperate when current (CT) saturation happens following a severe external fault. In this paper, new simple algorithm proposed scheme which realized by considering four ...