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Controlled Power Converters are extensively used in industrial applications as they can adapt the electrical energy as required by the application. However, these devices must be properly commutated in order to control voltages and currents. Indeed, power converters are known to be multivariable, coupled, and nonlinear systems; therefore, the control technique needs to be chosen carefully. There are...
Power converters have been widely used in industrial applications as parallel and series compensators, UPQCs, and STATCOMs. These electronic devices can also be utilized on weak-grid or micro-grid systems, where both the supply voltage amplitude and frequency, may vary considerably from the nominal values. Micro-grid and weak-grid systems are commonly associated to distribute non-conventional power...
This work evaluates the performance of a nonlinear control strategy of a modular photovoltaic (PV) plant that is used to support grid frequency control. The PV plant is designed based on a real study case and it has a modular structure consisting in several generating units. Each generating unit consists in PV arrays interfaced to the grid with a three-phase three-level cascaded H-bridge converter...
This work presents a case study of a modular photovoltaic (PV) plant where PV panel arrays are connected to the grid through cascaded single-phase current-source inverters. It is shown that, under non-uniform insolation conditions of the PV arrays, the output voltages of the cascaded inverters become unbalanced. Therefore, a dc voltage elimination control loop is proposed to balance the output voltage...
Single-phase inverters have gained important acceptance last time. This is because single phase inverters have been used in renewable energy, ac drives and many other applications and controlled by name ways as linear, nonlinear predictive between others. This paper studied the control of a Single-Phase Current Source Inverter (SP-CSI) for multi-cell and three-phase applications. Cascaded H-Bridge...
This work deals with the control of a single-phase Current Source Inverter (CSI) in a three-phase array which can be used for both power drives and PV applications. Unlike in three-phase inverters, where the Fortescue Transform or Park Transformation can be applied in order to simplify the design of the controllers, for single-phase systems they cannot be directly applied making the control a difficult...
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