Modular multilevel converter (MMC) is widely utilized in the field of high power conversion. It usually adopts cascaded proportional-integral (PI) control

which is equivalent to a type Ⅱ system. It is difficult to consider the dynamic performance and disturbance suppression

and there is a significant energy nonlinearity problem in the high-voltage DC bus. To solve the above problems

this paper proposes a full-state feedback control (FSFC) strategy for MMC

constructs a linearization model for MMC based on the energy perspective

and introduces the full-state variable feedback

which downgrades the model to a type Ⅰ system

improves the system disturbance suppression and damping characteristics while providing a fast response

and realizes the energy linearization in the DC voltage control. The paper derives the block diagram of the full-state feedback control structure

determines the state feedback gain coefficient when the damping characteristics are optimal

and compares and analyses the control characteristics of FSFC and cascaded PI. The results show that the FSFC has significant advantages over PI control and model predictive control (MPC) in terms of dynamic response

DC load step and grid voltage dips. Finally

a time-domain simulation and an experimental prototype are built to verify the effectiveness and superiority of the proposed full-state feedback control.