Effect of load transfer to penetration level of PV generation in distribution system

This paper is to investigate the impact of load transfer operation to the reduction of PV installation capacity so that the limit violation of voltage fluctuation caused by PV generation can be prevented. To determine the constraint of PV installation capacity when the load transfer is executed for distribution operation, the large scale PV systems installed in two feeders of the Feng-Shan District of Taiwan Power Company (Taipower) have been selected for computer simulation. The PV power generation is simulated according to the hourly solar irradiation and temperature provided by the weather bureau. The voltage variations of the distribution feeders are also performed by executing the 3-φ load flow analysis for the impact analysis of the PV system. To solve the reduction of PV installation capacity due to load transfer operation of distribution system, the advanced distribution automation system (ADAS) may be considered to perform the control of PV inverter for generation curtailment during the load transfer for service restoration. With the control of PV power generation to prevent over voltage problem, the PV installation capacity of distribution feeders can be increased to improve the penetration level PV system to make full use of renewable solar energy.