A Voltage and Power Flow State Calculation Technique of Distribution System using Measurement Values

This paper has described a technique of calculating voltage and power flow state of a distribution system using the information measured with two or more switches with sensors installed in a distribution system. The proposed technique is that, a set of the power distribution section where two or more switches with a sensor are connected is defined as the large section, and the active power and reactive power consumption in the large section are calculated based on measurement information, voltage (RMS), current (RMS) and power factor. Using the simple distribution system model that consisted of the large sections, the power consumption of the large section is calculated by the power flow calculation to separating power consumption and power distribution loss. It is distributed to the small sections that constitute the large section, and detailed power flow calculation is performed. Verification of the proposal technique and basic estimation of the calculation error were performed using the simple power distribution system model.