POWER MANAGEMENT DEVICE, HOST POWER MANAGEMENT DEVICE, POWER MANAGEMENT METHOD, AND POWER MANAGEMENT PROGRAM

To increase power transmission efficiency.SOLUTION: A power management device 10 includes a control unit 13 that controls a converter which can bidirectionally convert between an external bus voltage supplied to an external DC bus and an internal bus voltage supplied to an internal DC bus in a power supply system. The control unit 13 transmits, when a power storage amount of the power supply system falls below a first power storage threshold, a first power transmission request to a host power management device, selects a first reception power target value according to a first transmission power value in the first power transmission request from among a plurality of reception power target values, sets a target value of the external bus voltage to the first reception power target value, selects, when the power storage amount of the power supply system exceeds a second power storage threshold and a second power transmission request is received from another power supply system, a first transmission power target value according to a second transmission power value in the second power transmission request from among a plurality of transmission power target values, and sets the target value of the external bus voltage to the first transmission power target value.SELECTED DRAWING: Figure 4 【課題】送電効率を改善すること。【解決手段】電力管理装置１０は、外部直流バスに供給される外部バス電圧と給電システム内の内部直流バスに供給される内部バス電圧とを双方向に変換可能なコンバータを制御する制御部１３を備え、制御部１３は、給電システムの蓄電量が第１蓄電閾値を下回る場合、上位電力管理装置に第１送電要求を送信するとともに、複数の受電目標値の中から、第１送電要求における第１送電電力値に応じた第１受電目標値を選択し、外部バス電圧の目標値を第１受電目標値に設定し、給電システムの蓄電量が第２蓄電閾値を上回り、かつ、他の給電システムから第２送電要求を受信した場合、複数の送電目標値の中から、第２送電要求における第２送電電力値に応じた第１送電目標値を選択し、外部バス電圧の目標値を第１送電目標値に設定する。【選択図】図４