The operational economy of a distribution network is an important part of its economic evaluation. It directly affects the power efficiency of consumers. With the rapid development of the DC distribution network and the integration of multi-type distributed generation to a low-voltage network, how to quantitatively evaluate the operational loss of LVAC (low voltage AC) and LVDC (low voltage DC) distribution networks and further compare their operational economy have important guiding significance for the planning and operation of the future low-voltage distribution system. Given a typical topological structure of LVAC and LVDC distribution networks with multi-type distributed generation, an operational economy comparison evaluation model between LVAC and LVDC based on the whole system power loss is established. Then taking the operational economy as an objective, an optimization model of the operation strategy considering the charge-discharge state of energy storage is proposed. Finally, based on the data of the demonstration project of Shenzhen China-US Center LVDC distribution network, the power loss in the typical operation day is calculated and classified. Then the operational economy of AC and DC distribution networks is compared, while the impact of energy storage is discussed. The results show that the power loss of the system is different in spatial and temporal distribution with multi-type distributed generation integration, and the LVDC distribution network has certain advantages in operational economy under long-term operation. This work is supported by Key Science and Technology Project of China Southern Power Grid Company (No. 090000KK52180116), National Key Laboratory of Power System (No. SKLD19KZ04), and Sichuan Provincial Science and Technology Project (No. 2019YJ0631).