Abstract
Renewable Energy Source (RES)-based power plants need to control the active and reactive power at the Point of Common Connection (PCC) with the grid, in order to comply with the requirements of the Transmission System Operators (TSOs). This point is normally far away from the power converter station, and the cables and step-up transformers have a non-neglectable influence on the delivered power. In order to overcome this drawback, this paper presents a control algorithm that permits one to control remotely the power injected at the PCC, by adjusting the local controller of the Voltage Source Converters (VSCs). In this work, the synchronization with the grid is done based on the Virtual Flux (VF) concept. The results reveals that the VF estimation is able to produce a reliable estimation of the grid voltage in any point of the network, and makes it possible to calculate the necessary current reference for injecting a desired active and reactive power at a point that can be some kilometres away. In this paper the main principle for this remote power control is presented. Likewise, the simulation and experimental results will be shown in order to analyse the effectiveness of the proposed system.
Highlights
The prospects of renewable energy integration during the years is still very optimistic
The inverter has been powered by a programmable dc power which is connected controlled
VFsynchronization synchronizationthat thatpermits permitsone onetotocontrol control the theactive/reactive active/reactivepower powerdelivery deliveryinina aremote remotepoint pointofofthe thegrid, grid,asasfor forinstance instanceatatthe thetransformer transformer connection results from thethe simulation as well as the experimental studies prove that the connectionpoint
Summary
The prospects of renewable energy integration during the years is still very optimistic. The control strategy of these grid-connected power converters, especially the current control layer, can be performed in an αβ stationary reference frame, a dq0 synchronous reference frame, or in an abc reference frame. As mentioned in previous such as .[7,8,16,17,18,22], a virtual flux, Ψ, can bethe obtained by integrating the converter outputpapers voltage, Vconv. Converter integrating the converter output voltage, V conv. Should be taken into account for finding the converter output voltage before performing the Considering that the flux calculation will be based in the stationary reference frame, αβ, the virtual integration. The voltage drop caused by the conduction losses of the converter and the primary filter inductor, represented by the equivalent resistance R1 , losses converter and the filter inductor, represented by theperforming equivalentthe resistance
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