Low-frequency offset three-phase multi-inverter parallel operation control method under micro-grid island
A technology of three-phase inverter and multi-inverter, which is applied in the direction of single-network parallel feeding arrangement, AC network circuit, reducing/preventing power oscillation, etc. Problems such as small voltage and frequency fluctuations
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[0033] figure 1 It is a structural diagram of a three-phase multi-inverter parallel operation system under a microgrid island in an embodiment of the present invention, including multiple three-phase inverter systems, feeders, busbars, and loads. The three-phase inverter system includes distributed power supplies, Three-phase inverter bridge, LC filter, controller. u PCC is the bus voltage, i inv1 i inv2 i invNis the output current of inverter 1, 2, N, u inv1 , u inv2 , u invN is the output filter capacitor voltage of inverter 1, 2, N, L 1 , L 2 , L N is the filter inductance of inverter 1, 2, N, C 1 、C 2 、C N is the filter capacitor of inverter 1, 2, N, Z line1 ,Z line2 ,Z lineN is the feeder impedance of inverters 1, 2, and N connected to the bus, and N represents the total number of inverters in the microgrid.
[0034] figure 2 It is the structural diagram of the inverter controller control circuit in the embodiment of the present invention, including DSP ...
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