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This paper presents a three phase grid connected DC/AC inverter with active and reactive power (VAR) control for medium size renewable and distributed DC energy sources. The inverter, based on a voltage sourced inverter (VSI) configuration, allows the local residential energy generation to actively supply reactive power to the utility grid, at the same time, this topology allows to work this installation...
This paper presents a grid-side model and control for small wind turbines connected to the grid using a back-to-back converter. The control is developed to transmit all power generated by an induction machine to the grid and to match grid requirements. The grid synchronization is achieved by a Double Synchronous Reference Frame Phase Locked Loop (DSRF-PLL) even during grid faults or unbalanced conditions...
The Transmission System Operators are specially concerned about the Low Voltage Ride Through requirements of distributed generation power plants. Solutions based on the installation of STATCOMs and DVRs, as well as on advanced control functionalities for the existing power converters have contributed to enhance their response under faulty and distorted scenarios, and hence to fulfill these requirements...
In this paper a single phase inverter grid connected implementation is presented. The proposed solution is based on the calculation of the input line fundamental harmonic using a DSP processor. Our aim is to increase the inverter performance through a better synchronization with the grid and achieving a unitary power factor even in case of distorted input line, usually present in industrial environments...
This paper presents a new harmonic currents identification method called neural synchronous method and based on artificial neural networks. Its theoretical aspect relies on a new decomposition of the load current signals. Adaline neural networks are used in order to learn this decomposition on-line; the fundamental currents can therefore be estimated at each sampling time. The fundamental currents...
The problem, as described by this paper mill, is the desire to retire an inefficient condensing steam turbine generator for economic reasons and purchase additional power from the utility. The condensing unit, along with a modern extraction steam turbine generator and two utility ties, presently supply power to this three-bus medium voltage system via sync bus and reactor ties. A power system study...
This paper offers an overview of the passive methods used for islanding detection. A monitoring PLL has been adopted for the estimation of the voltage amplitude and frequency. Passive inverter resident methods discussed are the over/under voltage (OUV), over/under frequency (OUF), the voltage harmonic monitoring (with a study on the effects of the grid impedance value and of the inverter DC voltage...
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