Optymalne sterowanie kilku falowników przy ich równoległej pracy na sieć autonomiczną

Cooperation of the several inverters systems differing in parameters were considered. All inverters are connected to the common load. The load is impedance of the inductance type in star layout. Parallel with the star of load, the star of capacity is connected. The goal of the circuit is to create the symmetric layout of the 3-phase voltages at the load, which is asymmetric and can have impulse characteristic. The measurements of the voltages in autonomous grid at real object and measurements of the currents flowing from etery circuit to the load were taken. The controlled magnitude are currents flowing from the inverters for which the optima value is calculated. We need to take into account the limitation of maximum allowed value of this current. The system of inverters, connected parallel, can have tendency to oscillation. It manifests by presence of the high er ripples in inverters currents. These pulsations actually compensate each other, they are not noticeable at the load site and give needed load current. This phenomenon is a kind of resonance pulsation, it consists of transfer ring the power (even negative) between individual inverters and that is why it is very bad.