Fault coordination control and ride-through method and system of optical storage and direct flexible system

Abstract

The application discloses a fault cooperative control and crossing method and system of a light storage direct flexible system. The method comprises the following steps: acquiring operation state data of the light storage direct flexible system; judging whether a fault occurs in the system and determining a fault type according to the acquired data; when judging that an alternating current grid fault occurs in the system in a grid-connected operation mode, switching a photovoltaic port from a maximum power point tracking mode to a constant voltage mode, calculating a voltage deviation between a direct current bus voltage rated value and a direct current bus voltage according to the operation state data of the system, switching a mode of an energy storage port according to the voltage deviation, and updating an active power reference value of a grid-connected converter according to a dispatching instruction; and when judging that a direct current side short circuit fault occurs in the system in an off-grid mode, suppressing a fault current and physically isolating a fault point. Optimal power flow management and rapid system recovery in different fault scenarios are realized under the premise of ensuring stability of the direct current bus voltage and safety of equipment.

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