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In photovoltaic grid-connected inverter based on the deadbeat current control, the filter inductance variation and one-step-delay control affect the distortion of the grid current, stability and dynamic of the system. In this paper, a fast robust PWM method for photovoltaic grid-connected inverter is proposed, which reduces the distortion of the grid current caused by the filter inductance variation,...
The major drawback of the two switch flyback topology is its low-power applications such as microinverter. This study proposes a high-power two-switch flyback inverter and shows its excellent performance as a string-type PV inverter. The suggested inverter system is based on interleaving technique and operated in discontinuous conduction mode. Moreover, a fast and robust maximum power point tracking...
This work provides a simple and effective state space discrete-time model for LCL filters connected to the grid with uncertain inductance. This model is suitable for the design of digital robust controllers for this application. The proposed description is given by the combination of matrices obtained for the minimum and maximum values of the grid inductance, and is capable to provide small errors...
The objective of this paper is to design partial state feedback controllers, in order to reduce the number of sensors needed to implement this strategy for current control of grid-connected converters. The resulting control vector is suitable for digital implementation. The control gains are computed by means of linear matrix inequalities. The grid inductance is considered as an uncertain parameter...
This paper deals with the design of robust discrete linear quadratic regulators applied to three-phase inverters connected to the grid by means of LCL filters. The system is modeled in the state space in abc coordinates and changed to aß coordinates, allowing a simple control design and implementation. Resonant controllers are used to ensure the tracking of sinusoidal references for grid current....
This work deals with the design of a robust discrete-time quadratic controller applied to inverters connected to grid with uncertain inductance. First, the plant is modeled taking into account uncertain parameters and parasitic resistances, leading to a discrete-time polytopic model with two vertices. The control gains are computed by means of linear matrix inequality conditions. A design example...
This paper proposes a novel position sensorless control in the overmodulation range of an inverter for IPMSMs with magnetic non-linearity. This paper describes the simultaneous achievement of (1) position sensorless control, (2) robust maximum torque per ampere control in consideration of the magnetic non-linearity in an IPMSM, and (3) robust overmodulation drives of the inverter. First, this paper...
The predictive current control algorithm of permanent magnet synchronous motor (PMSM) drives has precise current tracking, constant switching frequency and is suitable for digital implementation. However, the conventional deadbeat predictive current control algorithm is sensitive to the stator inductance parameter mismatch. This paper presents an improved deadbeat predictive current control algorithm...
Short circuit III is the occurrence of a short circuit across the load during the conducting mode of the freewheeling diode. This has the same importance for the application of high power IGBTs as the known short circuit II. Different to short circuit II, the IGBT of the same module is now turned-on starting from very low voltage across its terminals and showing a forward recovery voltage before saturating...
This paper is concerned with the design and simulation of a pulse width modulation (PWM) rectifier for three-phase Permanent Magnetic motor drive. Based on the mathematical model of PWM rectifier, the dual-close-loop engineering design with decoupled feed-forward control is applied in the 3-phase voltage source rectifier. The objective to be reached is to realize unity power factor at the input ac...
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