Passivity‐based control of MMC‐based active power filter under non‐ideal conditions

Abstract

Summary To improve the voltage withstand level and maintain a high effective switching frequency of conventional active power filter, modular multilevel converter (MMC) with a high number of voltage levels is employed in shunt active power filter recent years, but few articles study this topology from the control strategy applicable to various non‐ideal states. This paper proposes a passivity‐based control (PBC) scheme for MMC‐based shunt active power filter (MMC‐SAPF) with independent positive‐ and negative‐sequence components, and the proper control laws have been defined based on the PBC method, which can also be applied to the non‐ideal state. The passivity of MMC‐SAPF and stability analysis are proved, and damping injection idea is used to design corresponding controllers with high dynamic performance. Besides, the overall control scheme is also based on circulation current suppressing controllers, submodule capacitor voltage controllers, and a harmonics detection section that can choose compensation signals flexibly according to the capacity of active power filter and is applicable in non‐ideal states, as well as ideal state, which can improve the comprehensive performance of this system. By comparing PBC with traditional PI control under ideal state and various non‐ideal operating states, the effectiveness and superiority of proposed strategy were validated by simulation and downscaled experiments.

Dual‐passivity‐based control strategy of modular multilevel matrix converter

“…If the input u and output y of the system and the energy supply rate y T u are established, the system is strictly passive 26,27 …”

“…According to the theory of passivity‐based control, the strictly passive systems can adopt passivity‐based control and the control system is stable 26,27 …”

“…Based on the decoupling model of M3C under double αβ 0 transformation, this paper proposes a passivity‐based control strategy for the M3C input‐side and output‐side, 24‐27 that is, dual‐passivity‐based control (DPBC) strategy. Compared with the traditional PI control strategy, that is, dual‐PI control (DPIC) strategy, the passivity‐based controller designed by using the passivity‐based control theory can achieve the global stability of the system, no singular point, and so on 28 .…”

Power losses minimization for modular multilevel converter s with second‐order and fourth‐order harmonic circulating current injection

“…The modular multilevel converter (MMC), which was first proposed by A. Lesnicar and R. Marquardt 1‐2 , was developed in 2003. Recently, the MMC has drawn significant attention from the power electronic industry and academia due to its advantages such as modularity, high efficiency, high‐quality waveforms and flexible expandability 3‐4 .…”

Analysis and validations of operation behaviors for dual active bridge‐based unified power quality conditioner under different working conditions

“…compensator (SVC), 4 static synchronous compensator, (STATCOM), 5 active power filter (APF), 6 and unified power quality conditioner (UPQC), 7 etc. Among these equipment, the UPQC has attracted more and more attention because of its ability to improve the power quality with respect to both voltage and current.…”