MAXIMUM POWER POINT TRACKING DEVICE AND POWER CHANGE AMOUNT MEASUREMENT METHOD

• Main Author: NAGATO SHUICHI
• Format: Patent
• Language: English; Japanese
• Published: 15.01.2015
• Subjects: BASIC ELECTRIC ELEMENTS; CONTROLLING; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; PHYSICS; REGULATING; SEMICONDUCTOR DEVICES; SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES

PROBLEM TO BE SOLVED: To improve the maximum power point tracking performance by quickly obtaining a generated power change amount P with respect to only an output voltage change under the consideration of a solar radiation change in a maximum power point tracking device 10 for controlling a power conversion device 6 such that a photovoltaic power generation device 1 outputs power at the maximum power point.SOLUTION: The output voltage of a photovoltaic power generation device 1 is changed by V in each t by voltage changing means 11, and a generated power change amount (P-P) before and after change is calculated by voltage search means 12. Also, a generated power change due to a solar radiation change is detected by providing a voltage fixation period T in which a voltage is fixed at a time interval tlonger than the t by voltage change detection means 13, and generated power due to the solar radiation change generated in the period is calculated in each t by correction means 14, and a generated power change amount (P-P) in each t is corrected by using the generated power as a correction amount, and a generated power change amount P with respect to only the output voltage change is calculated. 【課題】太陽光発電装置１が最大電力点で出力するように電力変換装置６を制御する最大電力点追従装置１０において、日射量変化を考慮して、出力電圧の変化のみに対する発電電力変化量 Ｐを速やかに取得して最大電力点追従性能を向上させる。【解決手段】電圧変化手段１１により太陽光発電装置１の出力電圧を ｔ毎に Ｖ変化させ、電圧探索手段１２により変化前後の発電電力変化量（Ｐ２−Ｐ１）を演算する。また、電力変化検出手段１３により ｔより長い時間間隔ｔｍａｘで電圧一定にする電圧固定期間 Ｔを設けて日射量変化による発電電力変化を検出して、補正手段１４により ｔ毎にその期間で生じた日射量変化による発電電力を演算し、この発電電力を補正量として ｔ毎の発電電力変化量（Ｐ２−Ｐ１）を補正して、出力電圧の変化のみに対する発電電力変化量 Ｐを求める。【選択図】図１