Method, storage medium and apparatus for adjusting charging-discharging efficiency ratio of energy storage power station

A method for adjusting a charge-discharge efficiency ratio of an energy storage power station, comprising:

• before charging, determining a theoretical charging electric quantity, a theoretical charging average power, an initial charging voltage and an initial charging current;
• setting the theoretical charging electric quantity Qc=(Ep×K1×(100−SOC))/100, wherein Ep represents a rated total energy of the energy storage power station, K1 represents a battery attenuation coefficient, and SOC represents a state of charge value;
• setting the theoretical charging average power Pc=Qc/(H0×K2), wherein H0 represents a valley time duration, and K2 represents a battery effective charging time coefficient;
• when a total voltage of current batteries is smaller than a battery platform voltage, setting the initial charging voltage as the battery platform voltage, and setting the initial charging current as a first current;
• when the total voltage of the current batteries is greater than or equal to the battery platform voltage, setting the initial charging voltage as a full-charge voltage of the batteries, setting the initial charging current as a ratio of the theoretical average charging power to the total voltage of the current batteries, wherein the first current is smaller than the ratio;
• in a charging process, when a power determined according to a charging output voltage and a charging output current reaches a current charging power output condition, adjusting a current charging current by using a preset step length;
• in the charging process, when an initial total voltage of the current batteries is smaller than the battery platform voltage and until the initial total voltage of the current batteries reaches the battery platform voltage, the charging output voltage and the charging output current are adjusted;
• in the charging process, determining a highest single cell voltage change rate and an accumulated charging electric quantity from a current time period to a next time period, and determining an adjustment direction of a charging power according to a magnitude relation of the highest single cell voltage change rate;
• responding to meeting a charging cutoff condition, ending the charging process, and recording the charging power, a charging average power and an actual charging time during the charging process;
• before discharging, determining a theoretical discharging electric quantity, a theoretical discharge average power and an initial discharge current;
• setting the theoretical discharging electric quantity Qd=(Ep×K1×SOC)/100;
• setting the theoretical discharge average power Pd=Qd/(H1×K3), wherein H1 represents a peak time duration, and K3 represents a battery effective discharge time duration coefficient;
• setting the initial discharge current as a ratio of the theoretical discharging average power to the total voltage of the current batteries;
• in a discharging process, when a power determined according to a current discharging current reaches a current discharging power output condition, adjusting the current discharging current by using a preset step length;
• in the discharging process, determining a lowest single cell voltage change rate and an accumulated discharging electric quantity from a current time period to a next time period, and determining an adjustment direction of the discharging power according to a magnitude relation of the lowest single cell voltage change rate;
• and responding to meeting the discharge a discharging cutoff condition, ending the discharge process, and recording a discharging electric quantity, a discharge average power and an actual discharge time duration during the discharge discharging process.