Generation Control with Modified Maximum Power Point Tracking in Small Isolated Power Network with Photovoltaic Source

In small isolated power networks without storage units and with photovoltaic (PV) panels operating at their maximum power points (MPPs), no frequency control is possible. To balance the network with PV panels only it is necessary to control the PV panels such that they produce the specific amount of power needed for stabilizing the system. Therefore, to control the grid frequency with PV panels only, a new algorithm was developed, where the PV panels´ bus is specified as a reference node. This algorithm allows operating the PV panels not only at their MPPs, but at an operating point where the needed power is produced. This operating mode is called "MPPT off mode", in contrast to "MPPT on mode", in which the PV panels always deliver the maximal possible power.