Technical Strategies for Voltage Power Regulation in LV Distribution Networks
We report the integration of a novel voltage regulation strategy in the inverter control algorithm for Dispersed Generation (DG) applications. The adoption of a decentralized voltage control based on local curves allows the voltage profile to be controlled at the Point of Common Coupling (PCC) of the generators and, therefore, the capacity of existing distribution networks to host more generation from renewables. The work is focused on a low voltage distribution network and both the reactive power modulation and the real power curtailment are considered in the proposed local strategy. Both numerical and experimental analysis are necessary in order to test and validate the proposed voltage control strategy. Firstly, the performances of the proposed control are tested by a numeral analysis and the impact on both the electrical system and the inverter apparatus is evaluated. Secondly, the benefit of the control strategy is analysed by experimental analysis in a test facility to verify the feasibility of voltage regulation in a real feeder.
Dispersed generation to provide ancillary services: AlpStore project
In the future, electrical systems should be able to integrate all users at the same time and guarantee power quality, stability and safety over time. The integration of renewable energy sources leads to new issues involving the intermittence of this generation typology. A high penetration of intermittent power plants will reduce the capability of the system to overcome critical events (e.g. frequency oscillations and voltage profile perturbation). This work presents new regulation schemes/functions developed in the AlpStore project framework, devoted to managing dispersed generation in order to provide ancillary services to the main grid. The work developed can be split into two main items: reactive injection regulation and frequency control regulation. The first regulation is devoted to increasing the Hosting Capacity of the distribution grid (i.e. it results to be a local control), whereas the latter aims to guarantee the energy balance of the national electric grid (i.e. it could be classified as a grid control).
Centrali ibride, tecniche di controllo per la gestione di micro reti intelligenti
Le centrali ibride, elemento chiave per poter realizzare e controllare le microreti ad alta penetrazione di Fonti Energetiche Rinnovabili, richiedono tecniche di controllo specifiche. In questo articolo si presenta una panoramica sulle varie modalità di controllo degli inverter di interfaccia delle centrali ibride e sulle diverse architetture di microrete che si possono realizzare. Si presentano inoltre alcuni risultati sperimentali ottenuti su una microrete a potenza ridotta sulla quale sono state implementate diverse strategie di controllo.