POWER CONVERSION DEVICE, METHOD FOR CONTROLLING POWER CONVERSION DEVICE, AND PROGRAM

To provide a power conversion device having high reliability, a method for controlling the power conversion device, and a program.SOLUTION: A power conversion device of an embodiment has a power converter and a converter control part. The power converter includes at least one arm unit in which is connected in series a plurality of unit converters having an energy storage element and a plurality of switching elements. The converter control part switches at least between a first control state in which the unit converters are made output a voltage of the energy storage element and a second control state in which the unit converters are shorted, thereby controlling conversion operation of the power converter. The converter control part has a state count computation part for calculating the number of unit converters to which the control state is allocated, a list computation part for generating list information of voltage magnitude relations of the energy storage element, and a unit converter selection part for selecting a unit converter the control state of which is to be changed. The unit converter selection part excludes a unit converter whose control state has not been continued for a minimum time from the unit converters whose control states are to be changed.SELECTED DRAWING: Figure 1 【課題】信頼性の高い電力変換装置、電力変換装置の制御方法、およびプログラムを提供することである。【解決手段】実施形態の電力変換装置は、電力変換器と変換器制御部とを持つ。電力変換器は、エネルギー蓄積要素および複数のスイッチング素子を有する複数の単位変換器が直列に接続されたアームユニットを少なくとも１つ有する。変換器制御部は、少なくとも、単位変換器にエネルギー蓄積要素の電圧を出力させる第１制御状態と単位変換器を短絡させる第２制御状態とを切り替えて電力変換器の変換動作を制御する。変換器制御部は、制御状態を割り当てる単位変換器の数を算出する状態数演算部と、エネルギー蓄積要素の電圧の大小関係のリスト情報を生成するリスト演算部と、制御状態を変更する単位変換器を選択する単位変換器選択部とを持つ。単位変換器選択部は、制御状態が最小時間継続していない単位変換器を、制御状態を変更する単位変換器から除外する。【選択図】図１