Passivity-based control with dual lagrangian model of four-wire three-level three-phase NPC voltage-source rectifier

Abstract

This paper presents the EL modeling of the fourwire 3-level 3-phase NPC voltage source rectifier (VSR). The load current of the four-wire 3-level 3-phase could be expressed in two forms: the load current involving the current of capacitor C 1 , and the load current involving the current of capacitor C 2 . So that two EL models will be obtained for four-wire 3-level 3-phase NPC voltage source rectifier. The models are completely in accordance with kirchoffs circuit theory and superposition law of course. One of the rules is utilized to control the voltage of C 1 and the other is used to control the voltage of C 2 . Transforming the EL model from the abc reference frame to dq reference model will completely retain the energy dissipative properties of two models. Having drived the EL models, the control method combined with the techniques of the energy shaping and damping injection applied to the dq frame EL models of the converter. To study the output regulation problem of C 1 and C 2 , the voltage indirect control method has been applied to the passivity based controller. To regulate the internal dynamics of the output voltages of C 1 and C 2 an outer loop that consisting PI controller is added to both controller models. To verify the ability of the proposed control method different simulations have been carried out by MATLAM/SIMULINK software. The simulation results clarify the abilities of the new method such as: very low THD, unity power factor, decoupled current loop dynamics, low oscillation in the neutral point potential (NPP).

Power Quality Improvement with a Pulse Width Modulation Control Method in Modular Multilevel Converters under Varying Nonlinear Loads

“…Among the various kinds of multilevel converters [1][2][3], modular multilevel converters (MMCs) have attracted increasing attention for various industrial applications such as Static Synchronous Compensators (STATCOM) [4], energy storage systems [5], power electronic-based transformers [6], rolling mill factories [7], high-voltage direct current (HVDC) [8][9][10], solar photovoltaics [11], grid-connected conditions [12], and motor drives [13]; simultaneously, many new modulation-based control strategies have been recently developed in order to present more effective controllers for these kinds of multilevel converters [14]. Several publications have focused on proposing modulation techniques with the aim of reducing capacitor voltage ripples and switching losses, as well as allowing a smaller cell capacitor size for MMCs [15,16].…”

Lypunov theory combined with small signal linearization for regulated operation of a hybridDC/ACmicrogrid

“…Many nonlinear control techniques furthermore were applied to power electronic converters as well as microgrids such as sliding mode control, 20,21 passivity theory, 22,23 and feedback linearization 24,25 . In this paper, a Lyapunov‐based control technique is proposed to make stable responses for a hybrid DC/AC microgrid.…”

A New Dual Lagrangian Model and Input/Output Feedback Linearization Control of 3-Phase/Level NPC Voltage-Source Rectifier

“…By applying odq transformation [16] to (21-25), the first equations of the rectifier in a rotating reference frame d-q may be written as below:…”

“…The input/output feedback linearization [13][14][15] control strategy that is proposed in this paper can enable the three phase/level NPC rectifiers to keep the output voltages and NPP at its desired values. Also, this control strategy is based on the dual lagrangian model [16] of the rectifier, which is obtained with the superposition law, the load current and the Euler-Lagrange description of the rectifier. Then, during the performance of the control strategy, the dynamics zero of the rectifier are avoided and the state feedback law controlled inputs are completed by pole placement.…”