Multi‐frequency power system for renewable source integration in smart grid

Abstract

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.

Evaluation of Multifrequency Power Electronic Converters: Concept, Architectures, and Realization

“…The proposed system shows adaptive impedance tuning, as the load-side hysteresis current controlled boost rectifiers can draw current at any desired frequency from MF bus voltage. The advantages of the proposed system, compared to the system reported in [11] are summarized as: (i) the proposed system is modular in structure with identical source-side and load-side power electronics interface modules, (ii) independent control of power transfer at distinct frequencies, (iii) flexibility to selectively transfer power from any desired source terminal to any desired load terminal without changing system's architecture and (iv) online dynamic powerflow management i.e., in case of a particular source failure, corresponding load demand can be fulfilled by other available source of the system.…”

“…Decoupled power transfer at distinct frequencies have been reported in [9]- [11]. The use of multiple frequencies for signal transmission is a well established technique in the radio communication and television broadcasting systems.…”

“…Power transfer at multiple frequencies have been implemented in various applications e.g. high-voltage dc-dc converters [9], [10], smart-grid [11]- [13], wireless power transfer [14], [15], ac motor drives [16], etc,. In [10], an additional frequency is used to implement nestled secondary power loop in a modular multilevel converter (M2C) to add multiple sources to M2C.…”

“…In [10], an additional frequency is used to implement nestled secondary power loop in a modular multilevel converter (M2C) to add multiple sources to M2C. In [11], a MF based smartgrid system with renewable integration is proposed. This system can selectively cater the loads operating at different frequencies.…”

Lyapunov function‐based improved switching command for a boost converter with an inductor–capacitor input filter

“…Switching DC–DC converters are widely employed in many systems in various applications [1–3], e.g. renewable‐energy conversion systems [4], DC microgrids [5], and transportation applications [6]. In particular, DC–DC converters are used to supply energy from the source to the load.…”