Photovoltaic System Impact Analysis and Voltage Control with Smart Inverters

• Main Authors: Da-Hao Zheng, 張大豪
• Other Authors: Chia-Hung Lin
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/80082715644846944148

碩士 === 國立高雄應用科技大學 === 電機工程系博碩士班 === 104 === This thesis investigates the distribution feeder impact and control strategies of PV systems. The distribution feeder network was obtained by retrieving the connectivity table and attribute data of distribution components from the database of Distribution Mapping Management System (DMMS). The PV power generation is simulated according to the hourly solar irradiation and temperature data provided by the Taiwan Weather Bureau. The voltage variation at the point of common coupling (PCC) is also derived by executing the three-phase load flow analysis to investigate the maximum PV installation capacity . In this study, three strategies for controlling a smart converter is proposed to prevent overvoltage problem due to much power injection of PV system. The first strategy was to employ the active power curtailment. During solar energy generation, the amount of electricity injected into a distribution feeder should be reduced to prevent voltage from exceeding 1.05 pu. The second strategy was to regulate the power factor according to the active power output of PVsystem; within the rated limits, the power factor of a converter was adjusted to maintain the voltage within certain limits to improve the system power quality, and to enhance the low-voltage grid capacity of a photovoltaics system. The third strategy was to regulate the reactive power output of Smart Inverter according to voltage output. When the voltage exceeds certain the specified limits, the amount of reactive power compensation can be output generated according to the allowable maximum voltage. to prevent overvoltage due to high penetration PV system. To assist the distribution system operation for feeders, the impact of voltage variation due to high penetration PV system is analyzed. The control strategy of PV smart inverters is proposed to mitigate the impact of renewable energy mtegration.