Optimal Planning of Battery Energy Storage Systems to Enhance PV Penetration Level in Distribution Systems

• Main Authors: Meng-Yuan Hsieh, 謝孟原
• Other Authors: Shih-Chieh Hsieh
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/22236827913230298118

碩士 === 義守大學 === 電機工程學系 === 103 === Presently, the renewable energy generation has been being developed all over the world. In May 2013, the European Photovoltaic Industry Association reported that the global installed capacity of PV had reached 102.2GW to generate 110TWh annually. The Council for Economic Planning and Development of Taiwan estimated that the global installed PV capacity will reach in the range between 288GW and 422GW in 2017. In other words, PV power generation will become the mainstream of renewable energy generation in the future. To overcome the shortcoming that PV systems could not generate power at night, the Battery Energy Storage System would be installed to improve the harness efficiency of the solar energy. The types of energy storage system are ranging wide from the smallest secondary batteries such as lithium-ion batteries to the pumped-storage hydroelectric power generation station or the compressed air energy storage system. The most important function of the energy storage system is that the stored renewable energy can be utilized to supply the power grid when the renewable energy systems cannot generate electrical power. When installing renewable energy systems in a distribution feeder, one must comply with the voltage variation rules. Take Taipower’s distribution system for instance, the capacity of renewable energy system is not allowed to be higher than 5,000kWp and the voltage variation before and after its installation should not exceed 2.5%. Therefore, in order to improve the utilization of renewable energy, this thesis proposes to incorporate the battery energy storage system with the PV system to store excess power by the PV system when the power injection to the grid may cause the violation of voltage variation rule. This thesis aims to use the BESS to increase the penetration of the PV systems in distribution systems, and to investigate the cost-benefit analysis and sensibility analysis.