MODEL PREDICTIVE CONTROL OF AN ELECTRICAL SYSTEM

摘要

An electrical system (10) comprises an electrical converter (12) for interconnecting an An electrical system (10) comprises an electrical converter (12) for interconnecting an electrical source (e.g. a grid) (14) with at least one rotating electrical load (16) and the electrical converter (12) comprises at least one active rectifier (18) and at least one inverter (20). A method for controlling the electrical system (10) comprises the steps of: receiving a set point reference (44) for the at least one electrical load (16) and a latest estimated state (38) for the converter (12), wherein the estimated state (38) comprises estimated values estimated from measurement values (26, 28) of the electrical system (10); predicting a sequence of future states and future inputs over a horizon of at least two time instants with a mathematical model (56) of the electrical system (10), wherein the future inputs comprises future rectifier reference values for the at least one rectifier (18) and future inverter reference values for the at least one inverter (20) and wherein the sequence of future states is predicted with the mathematical model (56) of the electrical system (10) by minimizing a cost function, the mathematical model (56) being based on a number of equations relating a present state of the electrical system (10) with a future state of the electrical system (10); and selecting future rectifier reference values (48) to be input to the at least one rectifier (18) and future inverter reference values (52) to be input to the at least one inverter (20) by selecting at least one future time instant from the horizon.