AUTOMATIC FREQUENCY MATCHING CONTROLLER FOR INTERCONNECTED SOLAR POWER GENERATION SYSTEM

摘要

PURPOSE: To make an interconnected solar power generation system suitable for commercial AC power systems having different frequencies by setting the center frequency and Q value of a band-pass filter constituting a double-humped band-pass filter or the constant of a system protective circuit in accordance with the frequency of an AC power system. CONSTITUTION: A double-humped band-pass filter (phase control circuit) 12 composed of two band-pass filters(BPFs) 10 and 11 is connected to the control system of the output current feed-back loop of an inverter 4. Before the inverter 4 is actuated, a system control circuit 9 detects the frequency of a commercial AC power system 1 by means of an AC voltage detector 13 and sets the center frequency and Q-value of a phase control circuit 12 in accordance with the frequency by supplying control signals to the filters 10 and 11. In addition, the circuit 9 sets the constant of a system protective circuit 15 and the center frequency and Q-value of a band-pass filter(BPF) 16 in accordance with the frequency of the power system 1.