Assessment of High Penetration of Renewable Energy on 2025 Taiwan Power System

• Main Authors: Yeh, Tai-Chieh, 葉岱杰
• Other Authors: G. W. Chang
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/6fed9g

碩士 === 國立中正大學 === 電機工程研究所 === 106 === In line with the nation’s renewable energy development goals, there will be a significant number of renewable resoures connected to Taipower system in the near future. The high penetration of renewable resoures inevitably causes certain impacts on the power system in Taiwan. The government plans to achieve 20% of renewable energy power generation in 2025. Among them, solar photovoltaic ( PV ) is planned to set a target volume of 20GW, and the wind power is planned to set a target volume of 4.2GW in 2025. Such a high penetration of renewable energy may cause line congestion and voltage fluctuations, and affect the amount of renewables for grid connection, either under steady-state or dynamic operation stages. Therefore, it is of importance to assess the Taipower transmission line power-carrying capacity and transient stability to gauge the maximum integrated renewable energy capacity in the power network. In addition, the “Duck Curve” is also an important issue addressed in other countries with a high penetration of PV installations. Thus, it is important to investigate the green power generation curve of PV output at different load levels after they are connected to the network, and to predict the changes in the net load curve of the Taipower’s system caused by a high penetration of PV capacity in the network. Because of the instability and unpredictability of renewable energy power generation, if the power grid failure occurs, the transmission congestion, transient stability, and reliability will be the most critical issues to maintain a stable system operation. Therefore, before and after the high penetration of renewable energy integration, it is necessary to analyze the system behavior after the fault, the influence of the system frequency, and the generator rotor angle stability. In the study PSS\E is adopted to perform required simulations for peak and light load cases of Taiwan's power system in 2025 with expected high penetration of renewable energy capacity. To ensure the reliable operation of the power system, a variety of steady-state and transient analyses are to be performed after the integration of a significant number of renewable energy, and the resulting network congestions, “Duck Curve” transient stability and reliability issues are reported. Then the mitigation strategies of the high penetration of renewable energy impacts on the system and load curves are suggested.