Grid-Connected Control Strategy of Five-level Inverter Based on Passive E-L Model

Abstract

At present, the research on five-level inverters mainly involves the modulation algorithm and topology, and few articles study the five-level inverter from the control strategy. In this paper, the nonlinear passivity-based control (PBC) method is proposed for single-phase uninterruptible power supply inverters. The proposed PBC method is based on an energy shaping and damping injection idea, which is performed to regulate the energy flow of an inverter to a desired level and to assure global asymptotic stability, respectively. Furthermore, this paper presents a control algorithm based on the theory of passivity that gives an inverter in a photovoltaic system additional functions: power factor correction, harmonic currents compensation, and the ability to stabilize the system under varying injection damping. Finally, the effectiveness of the PBC method in terms of both stability and harmonic distortion is verified by the simulation and experiments under resistive and inductive loads.

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

“…Assuming that y (11) is true. It can be concluded that the system satisfies the strict passive inequality, and therefore, this system can adopt PBC method 37 .…”

“…If there is a semi-definite and continuously differentiable storage function H(x) and a positive definite function Q(x) for ∀t > 0, the dissipation inequality is satisfied 37 :…”

“…where x, u, and y are the state variables, input variables, and out variables of the, respectively; the spaces are x∈Rn, u∈Rm, and y∈Rm, respectively; and f is the local Lipschitz about (x, u). If there is a semi-definite and continuously differentiable storage function H(x) and a positive definite function Q(x) for ∀t > 0, the dissipation inequality is satisfied 37 :…”

Structure analysis and sliding mode control of new dual quasi-Z-source inverter in microgrid

“…However, the predicted value of the grid impedance is difficult to ascertain. It is well known that the passivity‐based control method is based on energy shaping and damping injection idea by using the energy dissipation properties of the system under consideration . However, in existing passivity‐based control methods, there is no analytical robustness study which investigates the influence of parameter variations on the output voltage and the global stability.…”

“…It is well known that the passivity-based control method is based on energy shaping and damping injection idea by using the energy dissipation properties of the system under consideration. 13 However, in existing passivity-based control methods, there is no analytical robustness study which investigates the influence of parameter variations on the output voltage and the global stability. The aforementioned control methods offer various advantages and disadvantages related to dynamic response, robustness against parameter variations, steady-state error, and stability.…”