POWER CONVERSION SYSTEM, AND POWER CONVERSION DEVICE

• Main Authors: MAEBA KOTA, ITO TOMONORI, HORIO WATARU, HANAMURA KENJI
• Format: Patent
• Language: English; Japanese
• Published: 18.04.2019
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONTROL OR REGULATION THEREOF; CONTROLLING; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; PHYSICS; REGULATING; SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES; SYSTEMS FOR STORING ELECTRIC ENERGY

To improve power generation efficiency and power conversion efficiency of a solar cell (2) in a separated type power conversion system (1).SOLUTION: A first control circuit (12) performs MPPT (Maximum Power Point Tracking) control of a DC/DC converter (11). A second control circuit (22) controls an inverter (21) in such a manner that voltage of a DC bus (40) between the DC/DC converter (11) and the inverter (21) becomes voltage corresponding to a voltage command value which is calculated by the MPPT control due to the first control circuit (12). After the voltage of the DC bus (40) is stabilized at the voltage corresponding to the transmitted voltage control value, the first control circuit (12) calculates a next voltage command value by the MPPT control. After the voltage command value is received from the first control circuit (12), the second control circuit (22) controls the inverter (21) on the basis of the received voltage command value and, after the voltage of the DC bus (40) is stabilized, transmits update confirmation data to the first control circuit (12).SELECTED DRAWING: Figure 1 【課題】分離型の電力変換システム（１）において、太陽電池（２）の発電効率および電力変換効率を高くする。【解決手段】第１制御回路（１２）は、ＤＣ／ＤＣコンバータ（１１）をＭＰＰＴ(MaximumPowerPointTracking)制御する。第２制御回路（２２）は、ＤＣ／ＤＣコンバータ（１１）とインバータ（２１）間の直流バス（４０）の電圧が、第１制御回路（１２）によるＭＰＰＴ制御により算出された電圧指令値に対応する電圧になるように、インバータ（２１）を制御する。第１制御回路（１２）は、直流バス（４０）の電圧が、送信した電圧指令値に対応する電圧に安定した後、ＭＰＰＴ制御による次の電圧指令値を算出する。第２制御回路（２２）は、第１制御回路（１２）から電圧指令値を受信した後、受信した電圧指令値をもとにインバータ（２１）を制御し、直流バス（４０）の電圧が安定した後に、更新確認データを第１制御回路（１２）に送信する。【選択図】図１