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With the rapid development of smart community technologies, how to improve user comfort levels and make full use of renewable energy have become urgent problems. This paper proposes an optimization algorithm to minimize daily energy costs while considering user comfort level and renewable energy consumption rate. In this paper, the structure of a typical smart community and the output models of all components installed in the community are introduced first. Then, the characteristics of different types of loads are analyzed, followed by defining the coefficients of user comfort level. In this step, the influence of load-scheduling on user comfort level and the renewable energy consumption rate is emphasized. Finally, based on the time-of-use gas price, this paper optimizes the daily energy costs for an off-grid community under the constraints of the comfort level and renewable energy consumption rate. Results show that scheduling transferable loads and interruptible loads are not independent to each other, and improving user comfort level requires spending more money as compensation. Moreover, fully consuming renewable energy has side effects on energy bills and battery lifetime. It is more conducive to system economy and stability if the maximum renewable energy consumption rate is restricted to 95%.

In order to promote VLC become an appealing indoor wireless broadband access, VLC needs a ubiquitous network as its backbone to avoid becoming an information isolated island. Therefore, a novel and cost- effective framework of ubiquitous indoor broadband access based on deeply integrated VLC and PLC technology is proposed. The broadband access network supports two-way transmission through each LED using the decode-and-forward (DF) working mode. It is implemented at low cost by revising existing power facilities. Furthermore the duplex voice communication network prototype is built based on hybrid PLC-VLC structures in the laboratory. The experimental test results show that the system can support two-way broadband communication services, including voice, video and high speed data transmission up to 5Mbps in the case of the photodiode (PD) as a receiver. It can meet the high requirements of QoS (Quality of Service). The way provides an important means to solve the "last mile" communication, the increasing scarce spectrum resources and the growing demand for high speed communication.