抄録
The solar radiation has an irregularly varying factor due to a basic day and night cycle and climatic conditions. For such conditions a data sampling interval is important to assure the accuracy of energy monitoring in photovoltaic system. While treating a system monitoring equipment as a black box, the author has developed the method of calibrating an energy integrating function. At first for various input waveforms have been examined the relationship between sampling intervals and quasi integration outputs by trapezoidal rule. In the numerical simulation the phases of sampling clock are also considered. After all it is concluded that a sampling interval can be inspected through outside observation only by using a rectangular single pulse. By applying the pulse to the energy integrating process, two kinds of integrated outputs can be obtained for different sampling phases. The calculated difference between the both outputs can uniquely give sampling interval being inspected. Conditions to assure measuring accuracy are discussed and the validity of this method has been demonstrated experimentally. practical calibrating procedures are also proposed for the integrating function of PV system monitoring.
