POWER CONVERSION DEVICE AND POWER SUPPLY SYSTEM PROVIDED WITH THE POWER CONVERSION DEVICE

PROBLEM TO BE SOLVED: To avoid the problem of mutual interference of voltage control in the case of constructing a power supply system for connecting a power conditioner for performing MPPT control and a power conversion device in parallel with respect to a DC power generation device, and to achieve highly accurate MPPT control with high stability to the DC generation device without applying change, exchange, modification or the like to the power conditioner.SOLUTION: A power conversion device 1 is connected to a power conditioner 3 having an MPPT control function in a parallel state with respect to an output side of a DC generation device 2, and inputs and outputs direct current power Iin one direction or inputs and outputs the direct current power bidirectionally between its connection point N and an energy storage device (e.g., a power storage device) 4. A variable k representing a just enough ratio of generated power Pof the DC generation device 2 to an input power target value Pof the power conditioner 3 is calculated, a current value of a result of multiplying a power generation current Iof the DC generation device 2 by the variable k is calculated as a current command value I, and current Iof input/output is controlled so as to be the current command value I.SELECTED DRAWING: Figure 1 【課題】直流発電装置に対して、ＭＰＰＴ制御を行うパワーコンディショナ（パワコン）と、電力変換装置を並列に接続する電力供給システムを構築する場合に、電圧制御の相互干渉という問題を回避し、併せて、パワコンについて変更・交換・改変等を加えることなしに直流発電装置に対する高精度で安定性の高いＭＰＰＴ制御を実現する。【解決手段】電力変換装置１は、直流発電装置２の出力側に対してＭＰＰＴ制御機能を有するパワコン３と並列の状態で接続され、その接続点Ｎとエネルギー貯蔵装置（例えば蓄電装置）４との間で直流電力Ｉ2を一方向に入力、出力または双方向に入出力する。直流発電装置２の発電電力Ｐ0のパワコン３の入力電力目標値Ｐ1rに対する過不足の割合を表す変数ｋを求め、直流発電装置２の発電電流Ｉ0に変数ｋを乗算した結果の電流値を入出力の電流における電流指令値Ｉ2rとして求め、入出力の電流Ｉ2が電流指令値Ｉ2rとなるように制御する。【選択図】図１