Method for controlling low-voltage ride through of cascaded photovoltaic grid-connected inverter
A low-voltage ride-through and control method technology, which is applied in photovoltaic power generation, irreversible DC power input conversion to AC power output, single-grid parallel feeding arrangement, etc. Realize the effect of low voltage ride-through control
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[0037] This control method for low-voltage ride-through of cascaded photovoltaic grid-connected inverters is based on the mathematical models of grid-side voltage under two common asymmetric grid fault conditions, and summarizes the three-phase grid-side voltage amplitude under different fault conditions The law between phase and phase.
[0038] Based on the above rules, the control methods of cascaded photovoltaic grid-connected inverters under different fault conditions are deduced: (1) When a single-phase ground short-circuit fault occurs, fault-tolerant control based on zero-sequence voltage injection is adopted; (2) Two-phase When a phase-to-phase short-circuit fault occurs, fault-tolerant control based on negative-sequence voltage injection is adopted.
[0039] The low voltage ride-through control of the cascaded photovoltaic grid-connected inverter is realized by setting the switching state of the H-bridge power device to bypass the power unit, recalculate the optimal m...
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