CONTROL SYSTEM FOR MICROGRIDS FOR THE PRODUCTION AND DISTRIBUTION OF ELECTRIC POWER COMING FROM MULTIPLE PRODUCTION SOURCES OF DIFFERENT TYPES, AND CONTROL METHOD THEREOF

摘要

It is described a control system for a microgrid for the production and distribution of electric power coming from multiple electric power sources of the intermittent and/or random and/or programmable and/or accumulation-system type,said microgrid control system being organized with a hierarchical control structure on two levels, comprising a first control level for power conversion systems (PCS) of electric power coming from said multiple electric power sources, a second control level for a microgrid controller (MC) adapted to cooperate with said first control level, said second control level being adapted to control electric power to be supplied to a distribution network (on-grid condition) and/or to be supplied as the primary generation to power up isolated loads (off-grid condition) and/or to control intelligent distributed electric power accumulation systems (ACC),said second control level for the microgrid controller (MC) comprising: a monitoring system (MON), adapted to interface with physical signals generated by said control system, and to perform operations on said power conversion systems (PCS) and on said microgrid;a control function (FC) system, adapted to receive, at the inputs, measurements and states of the control system and to provide, at the output, parameters and set points through which said monitoring system (MON) acts on said power conversion systems (PCS), so as to manage the power flows of the microgrid;a state machine (MAS), adapted to cooperate with said monitoring system (MON) and said control functions (FC), so as to control the operating conditions of the microgrid and decide, based on said conditions, which control functions (FC) are to be enabled;said first control level (CPCS) of power conversion systems (PCS) being adapted to control the values of voltage (V), frequency (f), active power (P) and reactive power (Q) generated by said microgrid, and comprising: a droop control system under said on-grid condition, adapted to act on the values of said active and reactive power (P₀ and Q₀), keeping them at set-point values (P_ref and Q_ref), by increasing or decreasing frequency and voltage, respectively, based on first droop curves;a droop control system under said off-grid condition, adapted to act on the values of said voltage (V) and frequency (f), keeping them at set-point values (f_ref and V_ref), based on second droop curves.