The 4th Purple Mountain Forum on Smart Grid Protection and Control (PMF-SGPC 2019) will be held on August 17-18, 2019 in Nanjing, China. The aim of the conference is to provide an international forum for experts to promote technical exchanges and share of expertise in the field of smart grid operation, protection and control. This conference is sponsored by State Grid Electric Power Research Institute (also called NARI Group Corporation) and the State Key Laboratory of Smart Grid Protection and Control, which will include keynotes and invited speeches, plenary sessions, round table discussions, and oral presentations/poster sessions for accepted papers.