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Abstract
This paper deals with the power conversion system architectures to interface a stationary electrochemical storage installation with the network. Theoretical justifications about the conversion system layouts and control, used for actual Italian installations, are given. This paper aims at giving the power energy society an overview of actual possibilities of static conversion of d.c. battery sources.
Highlights
An electrochemical energy stationary storage system (EESSS), as a matter of principle, could be directly connected to the HV network by means of an inverter
This effect is due to the fact that an inverter generally operates according to a PWM switching scheme [7,8] in which, in order to pilot the inverter switches, a sinusoidal reference signal is compared with a sawtooth signal with higher frequency
The main aim of this work is to focus on the necessary elements which must be taken into account when a power conversion architecture has to be chosen, in the light of the PCS state of the art namely:
Summary
An electrochemical energy stationary storage system (EESSS), as a matter of principle, could be directly connected to the HV network by means of an inverter. This behaviour implies two consequences: With a direct inverter−EESSS connection, the EESSS (e.g., a battery) voltage variations would imply a remarkable increase of the harmonic content (h) in the inverter output voltage. This effect is due to the fact that an inverter generally operates according to a PWM switching scheme [7,8] (see Section 3) in which, in order to pilot the inverter switches, a sinusoidal reference signal is compared with a sawtooth signal with higher frequency. It consists of a first stage made by a d.c.-d.c. converter and of a second stage made by a d.c.-a.c. converter so enabling to keep the inverter d.c. side voltage Uo constant
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