Power storage system, voltage transformer and power storage power conditioner

A power storage system comprising:

• a voltage transformer, and
• a power storage power conditioner,
• wherein the voltage transformer comprises
• a first input part to which direct-current power output from a power generator is input,
• a first voltage transform part that transforms a voltage of the direct-current power input to the first input part into a first predetermined voltage, and
• a first output part that outputs the direct-current power transformed into the first predetermined voltage to the power storage power conditioner,
• wherein the power storage power conditioner comprises
• a second input part to which the direct-current power output from the first output part is input,
• a second voltage transform part that transforms the first predetermined voltage of the direct-current power input to the second input part into a second predetermined voltage,
• a first input and output part that outputs the direct-current power transformed into the second predetermined voltage to a battery unit and to which direct-current power is input from the battery unit,
• a conversion part that converts the direct-current power input to the second input part into alternating-current power, and
• a second input and output part that outputs the alternating-current power to a power system or a load and to which alternating-current power is input from the power system,
• wherein the conversion part converts the alternating-current power input to the second input and output part into direct-current power,
• wherein the second voltage transform part transforms a voltage of the direct-current power converted by the conversion part into the second predetermined voltage and transforms a voltage of the direct-current power input to the first input and output part into a third predetermined voltage, and
• wherein the conversion part converts the direct-current power transformed into the third predetermined voltage by the second voltage transform part into alternating-current power.