PHOTO VOLTAIC POWER GENERATION SYSTEM

• Main Author: SHIMADA RYUICHI
• Format: Patent
• Language: English; Japanese
• Published: 16.12.2022
• Subjects: CONTROLLING; PHYSICS; REGULATING; SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES

To provide a connection device, a PV module, and a photovoltaic power generation system that enable Maximum Power Point Tracking (MPPT) control for each module.SOLUTION: Each of connection devices 10 is configured to: turn on a first semiconductor switch 6 and a second semiconductor switch 7 simultaneously to set a voltage of a capacitor 4 to zero; immediately after that, turn off the first semiconductor switch 6 and the second semiconductor switch 7 simultaneously to recharge the capacitor 4; meanwhile, calculate generated power of a PV module 1, using a predetermined formula based on a voltage measured by a voltage sensor 5; and scan the voltage to determine and store, as a new maximum power point voltage, a voltage at a point where the generated power being calculated is maximum; and perform step-down DC/DC conversion on the PV module 1, so as to control each PV module so that the voltage of the PV module reaches the maximum power point. A number of PV modules are connected with each other in series to form a string, and connected to a system through voltage-type DC/AC inverse conversion after step-up DC/DC conversion of current thereof or directly through current-type inverse conversion.SELECTED DRAWING: Figure 1 【課題】モジュール毎にＭＰＰＴ制御を可能とする接続装置、ＰＶモジュール及び太陽光発電システムを提供する。【解決手段】第１の半導体スイッチ６と第２の半導体スイッチ７を同時にオンして一旦コンデンサ４の電圧をゼロにした直後、第１の半導体スイッチ６と第２の半導体スイッチ７を同時にオフしてコンデンサ４を再充電しつつ、電圧センサ５にて計測した電圧に基づいて所定の計算式によりＰＶモジュール１の発電電力を算出し、算出した発電電力が最大となる点の電圧をスキャンして新たな最大電力点電圧）として記憶し、ＰＶモジュール１に降圧型ＤＣ／ＤＣ変換する接続装置１０によって、各ＰＶモジュールが最大電力点の電圧になるように制御して、多数直列接続してストリングとなし、その電流を昇圧型ＤＣ／ＤＣ変換した後に電圧型ＤＣ／ＡＣ逆変換若しくは直接に電流型逆変換により系統に連系する。【選択図】図１