This paper proposes a Multi-Objective Improved Particle Swarm Optimization (IPSO) for placing and sizing the series Modular multilevel converter based unified power flow controller (MMC-UPFC) FACTS devices to manage the transmission congestion and voltage profile in deregulated electricity markets. The proposed multi-objective IPSO algorithm is perfect for accomplishing the close ideal Distribusted Generation (DG) sizes while conveying smooth assembly qualities contrasted with other existing algorithm. It tends to be reasoned that voltage profile and genuine power misfortunes have generous upgrades along ideal speculation on DGs in both the test frameworks. The proposed system eliminates the congestion and the power system can be easily used to solve complex and non-linear optimization problems in a real-time manner.