Photovoltaic energy storage system, power system, and high-voltage ride-through control method

A power system, comprising an inverter and an energy storage device, wherein;

• an input end of the inverter is connected to a direct current bus, and an output end of the inverter is configured to connect to an alternating current power grid;
• the energy storage device is connected to the direct current bus;
• the inverter is configured to send high-voltage ride-through information to the energy storage device when a high-voltage ride-through occurs in the alternating current power grid;
• and
• the energy storage device is configured to:
• when the high-voltage ride-through information is received, adjust an output voltage reference value to maintain a discharging working state in response to the energy storage device being in the discharging working state, or adjust a charging power reference value to maintain a charging working state in response to the energy storage device being in the charging working state.

A high-voltage ride-through control method, applied to a photovoltaic energy storage system, wherein:

• the photovoltaic energy storage system comprises an inverter and an energy storage device, an input end of the inverter is configured to connect to a direct current bus, the energy storage device is configured to connect to the direct current bus, and an output end of the inverter is configured to connect to an alternating current power grid;
• and
• the high-voltage ride-through control method comprises:
• receiving high-voltage ride-through information sent by the inverter, wherein the inverter is configured to determine whether a high-voltage ride-through occurs in the alternating current power grid;
• and
• when the high-voltage ride-through information is received, adjusting an output voltage reference value to maintain a discharging working state in response to the energy storage device being in the discharging working state, or adjusting a charging power reference value to maintain a charging working state in response to the energy storage device being in the charging working state.