Since the development of smart grids, countries have established different smart grid technical standards based on their own energy characteristics, and developed smart grids suitable for their own countries. The construction of Ubiquitous Power Internet of Thing (UPIoT) has become a new strategy for the development of smart grids in China. The NIST’s (National Institute of Standards and Technology) interoperable smart grid conceptual architecture model and smart grid cybersecurity standards have certain reference significance for the construction of UPIoT in China. This paper analyzes the NIST’s interoperable smart grid conceptual architecture model and smart grid cybersecurity standards from the perspective of technical architecture and cybersecurity strategy. By studying conceptual architecture model and cybersecurity standards of the NIST, it analyzes interoperability design of the smart grid and summarizes the inspiration of U.S. smart grid technology to China's new stage of UPIoT construction. This work is supported by National Natural Science Foundation of China (No. 51707014), Youth Fund of Natural Science Foundation of Hunan Province (No. 2018JJ3534), and Key Laboratory of Renewable Energy Electric-Technology of Hunan Province (No. 2017ZNDL005).