|Author's Email Address
||This thesis had been viewed 5350 times. Download 263 times.|
|Type of Document
||Distribution System Planning and Protection Coordination Considering Integration of Renewable Energy Generation|
|Date of Defense
||Markov random procedure
loop power controller
advanced distribution automation system
loss of load expectation
permissive overreaching transfer trip
||The first part of this dissertation presents strategies to expand the capacity of distribution substations based upon loss of load expectation (LOLE) levelsand the impact of photovoltaic (PV) systems. Historical solar irradiation data were collected and applied using the Markov random procedure in order to derive the probability distribution of PV power generation. Chi-square fitness and independence tests have proven this simulation procedure effective. The LOLE of the distribution systems in this study was examined by integrating three models: probabilistic PV power generation, risk of main transformer outage, and load growth of various types of customers. |
The second part of this dissertation presents a loop power controller (LPC) for the control of real and reactive power flows in order to achieve loading balance among distribution feeders. To demonstrate the effectiveness of the LPC by adjusting voltage ratio and phase shift between two feeders, a Taipower distribution feeder with a large-scale PV system, which has been installed at the Kaohsiung World Games Stadium, has been selected for computer simulation.
The third part discusses the Advanced Distribution Automation System (ADAS), which was applied to monitor the operation status of wind generators (WG) and line switches. A change in the network configuration can be caused by either transferring load between distribution feeders or by varying the WG operation status. This change requires the ADAS control master station to activate the adaptive relay setting, perform a short circuit analysis to simulate the magnitude and direction of fault current flows, and adjust the protective relay settings accordingly. The sample distribution feeders with open- and closed-loop configurations were used to demonstrate the adaptive relay setting for distribution systems with various WG operation scenarios. This data suggests that the fault currents contributed by WGs must be included in the ADAS system configurations of the TAP/LEVEL settings of protective relays in order to achieve adaptive protection of smart distribution systems. To prevent the improper coordination of protective relays forthe closed-loop distribution systems with many WGs, the protective scheme of permissive overreaching transfer trip(POTT)has also been proposed as a means of simplifying the protective coordination for closed-loop distribution systems.
This study advances our knowledge in three ways. It establishes a stochastic solar irradiation model to help expand the capacity of distribution substations connecting renewable energy sources, it provides a useful solution to improper relay coordination caused by renewable energy, and its LPC and adaptive protection relay settings can reduce the loss of energy in distribution lines and increase the operation flexibility and reliability of distribution systems.
||Cheng-Ting Hsu - chair|
Mei-Song Kang - co-chair
Chia-Hung Lin - co-chair
Chun-Lien Su - co-chair
Shih-Chieh Hsieh - co-chair
Jen-Hao Teng - co-chair
Chao-Shun Chen - advisor
Indicate in-campus at 0 year and off-campus access at 5 year.|
|Date of Submission