Feasibility Analysis of AC and DC Hybrid Power Transmission over the Same Transmission Line

Although distributed DC power generation technology has moved forwards with great progress, the design and construction cost of re-laying DC power supply lines is much high, so the overall application level is low. Considering that most household appliances are ultimately powered by DC Power directly and indirectly, and referring to the concepts of Power over Ethernet (PoE) and Power over Data Line (PoDL), etc., the idea of combining DC Power supply lines with existing AC Power supply lines and then realizing common-cable transmission is proposed. In this paper, a variety of potential common-cable transmission schemes are presented, including a single-pair-wire system with matrix converter and a single-pair-wire system with rectifier-inverter, and their principle and feasibility are analyzed deeply.