This study presents a new power system enabled by power-electronic technology for renewable source integration in micro-grid. The micro-grid is decoupled into multiple independent power channels. These power channels are used for any source to any load-independent power transfer over the common power transmission line. This system works on the principle of frequency-selective orthogonal power transfer and superposition theorem. To demonstrate the proposed power system, a laboratory-scale prototype of an interconnected two-source two-load system is developed. The two sources independently transfer power to their respective loads at power transmission frequencies of 500 and 0 Hz (DC is also a valid frequency for power transmission), respectively, over the common power transmission path. Thus, a two-source two-load system is decoupled into two independent power channels. The proposed system is modular and scalable in structure and can be extended for any number of sources and loads. Finally, the effectiveness of the proposed system is verified through simulations and experimental results which demonstrates independent transmission of 100 W power in each of the two power channels of the two source-two load interconnected system.

No abstract

There exists two well known types of power transfer ac or dc. Power transfer at multiple frequencies has not yet gained much attention. This paper aims at bringing out such topologies, which are capable of integrating different electrical power sources (ac or dc) irrespective of its frequency of generation, form a multi-frequency bus, transmit power over a single line and extract/convert them at the load side. This leads to the definition of unified utility/grid concept. For this, the paper presents more insight into three possible multi-frequency converter topologies with renewable energy sources (RESs)/battery integration. The proposed topologies work on the principle of orthogonal power transfer. Furthermore, power transfer at multiple frequencies shows an effective way of decoupling the individual sources of the system. Finally, the feasibility of transferring power at multiple frequencies is validated experimentally and the results are discussed herein along with its potential benefits.

No abstract

No abstract