Abstract:
A hybrid power system (1 ) is disclosed. The system comprises a plurality of dispatchable power resources (7.i; 7.j) and a first controller (12) for controlling the dispatchable power resources. The system further comprises a power resource section (5) responsive to environment conditions and a second controller (17) for controlling the power resource* section (5) responsive to environment conditions. The second controller (17) is configured and arranged for measuring a total power (∑P genset ) generated by the plurality of dispatchable power resources (7.i; 7,j) and a total power (∑P PV ) generated by the power resource section (5) responsive to environment conditions; and for generating a power curtailment signal (PV curtailment ), when required, for reducing the total power (ΣΡ PV ) generated by the power resource section (5) responsive to environment conditions.
Abstract:
DC/AC converter comprising a new control device and method for managing inrush current transients during operation without requiring additional external devices or emergency operating modes forcing the DC/AC converter to shut down. The present invention is particularly, but not exclusively, aimed at grid connected DC/AC converters, often subject to inrush current phenomena due to perturbations in the grid.
Abstract:
The multi-level DC/AC converter, comprising: an input (5,7) connectable to a direct voltage source (3), with a first connection (5) and a second connection (7) between which can be applied an input voltage (Vi); a half-bridge with a first controlled switch (21) and a second controlled switch (25) between which is positioned an output (U) of the converter; a first connecting branch (15) between the first controlled switch (21) and the first connection (5) and a second connecting branch (17) between the second controlled switch (25) and the second connection (7); a third controlled switch (59) associated to the first controlled switch (21), connectable in series to the first controlled switch to generate an output voltage exceeding a first limit value (Vi/2); a fourth controlled switch (61) associated to the second controlled switch (25), connectable in series to said second controlled switch to generate an output voltage below a second limit value (−Vi/2).
Abstract:
The system provides for one or more photovoltaic panels (3) or other energy sources, connected to a series of inverters (5) in parallel, the outputs of which are connected to a load (Z) and/or to an electricity distribution grid (7). One of the inverters operates as master unit and generates a power control signal in order to track the maximum power point that can be obtained from the panels (3). The other inverters operate as slave units. The control is performed so that all the inverters absorb a variable quantity of power according to the fluctuations in the power available at the output of the photovoltaic panels (3) or other source subject to fluctuations.
Abstract:
Multi-level inverter introducing a new topology wherein standard IGBTs can be employed in place of common emitter IGBTs, wherein switching and conduction losses are minimized and wherein the number of implemented levels can be easily increased with the addition of a minimum number of components.