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This paper focuses on dynamic performance control of modular multilevel converters (MMC) in high-voltage direct current (HVDC) transmission systems. To achieve this objective, a new mathematical model including six state variables of ac-currents and dc-link voltage of MMC, and circulating currents of converter arms are proposed for MMC in d-q reference frame. In addition, a robust control technique...
A droop-Lyapunov based control technique using direct-quadrature (d-q) rotating frame dynamic model is presented in this paper for the frequency and voltage magnitude regulation of a stand-alone single-phase voltage-source inverter (SPVSI). Steady-state and dynamic performance of the controller are analyzed based on the d-q frame model and direct Lyapunov method respectively to satisfy control aims...
This paper proposes a control technique of an interfaced converter for the integration of Distributed Generation (DG) sources into the power grid. The proposed control technique provides compensation for the active, reactive, and harmonic current components of grid-connected loads. Proper switching functions of the interfaced converter have been defined based on passivity control theory by achieving...
This paper introduces a control strategy for assessing the role of shunt active power filters (SAPF) in electrical power networks. The proposed control scheme is based on the Lyapunov control theory and defines a stable operating region for the interfaced converter during the integration with utility grid. The compensation of instantaneous variations of reference current components in the control...
This paper deals with a control technique for multilevel converter topologies base on Direct Lyapunov Control Method (DLCM) for integration of Renewable Energy Resources (RER) into the power grid. The compensation of variations in reference current components is considered properly in this control plan, which is the main contribution and novelty of this work in comparison with other control strategies...
This paper presents a multifunction control strategy for the stable operation of Distributed Generation (DG) units during grid integration. The proposed control model is based on Direct Lyapunov Control (DLC) theory and provides a stable region for the appropriate operation of DG units during grid integration. Using DLC technique in DG technology can provide the continuous injection of maximum active...
Distributed generation (DG) corresponds to the application of small generating units which are the set up in distribution systems or near load centers. Utilization of DG influences various operational indices of the distribution feeders such as feeder loading, electrical losses and voltage profile. In addition, use of DG in its appropriate size is an essential tool to attain the DG maximum potential...
This paper presents an input/output feedback linearization control strategy for the three-level three-phase neutral-point-clamped rectifier using it's dual Lagrangian modeling, which is obtained based on the superposition law, the load current and The Euler-Lagrange description of the rectifier. The load current can be given in two forms: 1. the load current involving the current of capacitor C1 and...
An ac neutral wire is connected to the midpoint of the dc bus of the three level/phase NPC rectifiers and then a new dual Lagrangian model of the rectifier is presented in this paper. At first, the load current can be obtained in two forms: 1. the load current involving the current of capacitor C1 2. The load current involving the current of capacitor C2 and then the new model is founded based on...
The load current of three level/phase neutral point clamped rectifier could be expressed in two forms: the load current involving the current of capacitor C1, and the load current involving the current of capacitor C2. Using the Euler-Lagrange model based on the superposition law and the obtained load current, a new dual Lagrangian model of the rectifier is founded in this paper and then the two obtained...
One of the main concerns in controlling the output voltage of boost converter is keeping the output voltage in a desirable value under the variations of load and parameter uncertainties. This paper presents a control method which is based on sliding mode control (SMC). One of the major features of this method is its ability to provide fast error convergence and strong robustness. The try is to provide...
In this paper, a new unidirectional three-level rectifier is presented to draw sinusoidal line current with low THD and unity power factor. The adopted rectifier consists of a diode bridge, a power switch and two blocking diodes. Low cost, simple structure and convenient control are the main advantages of this rectifier. A two loop controller is developed to control the adopted rectifier. A voltage...
In this paper, a new control scheme is proposed for the new single-phase single-switch three-level rectifier to supply two different load with different voltages and draw sinusoidal line current with low THD. The adopted rectifier consists of a diode bridge, a power switch and two blocking diodes. Low cost, simple structure and convenient control and three level voltage are the main advantages of...
This paper presents the EL modeling of the four-wire 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 C1, and the load current involving the current of capacitor C2. So that two EL models will be obtained for four-wire 3-level 3-phase NPC voltage source rectifier...
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