A photovoltaic grid-connected inverter low-voltage ride-through control system
A low-voltage ride-through and control system technology, applied in photovoltaic power generation, AC network voltage adjustment, AC network circuits, etc., can solve problems such as limiting the size of reactive power and the impact of reactive power, and prevent capacitor voltage fluctuations from exceeding the limit , Optimize the fluctuation range of sub-module capacitor voltage and increase the effect of output reactive power
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[0041] Take the MMC modular multilevel inverter as an example: such as figure 1 As shown, the photovoltaic grid-connected inverter low-voltage ride-through control system of the present invention is as follows: on the basis of the traditional double-closed-loop vector control system of the current inner loop voltage outer loop, the low voltage ride-through control module and sub-module capacitors are added Voltage control module; when the grid-connected point voltage drop is detected, the low-voltage control module is used to inject reactive current and limit the active current, and the sub-module capacitor voltage control module is used to control the fluctuation range of the sub-module capacitor voltage when reactive power is emitted.
[0042] Such as figure 2 As shown, the low-voltage control module includes a reactive current injection unit and an active current limiting unit; when the grid-connected point voltage drop is detected, the reactive current injection unit is u...
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