By Chao-Shun Chen, Chia-Hung Lin, Te-Tien Ku, and Cheng-Ting Hsu
The Penghu smart grid (SG) demonstration project is sponsored by the National Energy Project (NEP) to derive the guidelines for the smart grid roadmap in Taiwan. The smart grid companies are also invited for the installation of the SG demonstration system to obtain the reference site of smart grid project in the actual Taiwan Power Company (Taipower) system. This project will develop and commercialize the key components and application functions of smart grid to enhance the technology of the local SG companies to compete in the international SG market. The project will also comply with the national goal of Penghu low carbon emission project by providing the testing platform of smart grid to verify various SG functions. Taipower will also develop the planning of smart grid implementation in her whole power system based on the try run results of this project.
A research consortium formed by five universities, several research institutes and 10 local companies in Taiwan to develop key components and application functions of the smart grid with the Taipower system as the testing bed. The objectives of this SG demonstration project are to develop the following subsystems.
- Renewable energy management system (REMS)
- Advanced distribution automation systems (ADAS)
- Transformer management system (TMS)
- Advanced metering infrastructure (AMI)
Advanced Distribution Automation System
Two distribution feeders (RA18 and RA26) have been selected for feeder automation to perform the function of fault detection, isolation and restoration (FDIR). Besides the installation of four-way line switches and optical fiber for the communication system, the FDIR function will be executed by the existing feeder dispatcher control system (FDCS) in Taipower. A dual port of feeder remote terminal unit (FRTU) will be provided to handle the data transmission with the master station of distribution management system (DMS) in the SG demonstration room so that more advanced application functions and testing can be performed. The intelligent feeder terminal units (FTUs) are installed with the lateral terminal units (LTUs) to execute the service restoration for the fault on distribution lateral circuits within 10 seconds. Different IEC data transmission standards will be integrated to complete the construction of Common Information Module (CIM) for data exchange among SG subsystems.
Renewable Energy Management System
To support the integration technology of renewable energy generation for the million solar photovoltaic (PV) roof project in Taiwan, the testing environment of high penetration DG is set up on both Penghu Island and Chi-Mei Island. The impact analysis of distribution feeders due to real power generation by PV systems is performed in REMS to solve the bus voltage. The decision making of autonomous control or voltage-var control with reactive power compensation for smart inverters is determined when the over-voltage violation occurs. By applying the REMS to perform the control of PV smart inverters, the over-voltage problem due to too much power generation during peak solar irradiation periods can be completely resolved. It is found that the allowable maximum PV penetration of typical distribution feeder can be increased by 40% with the implementation of REMS for intelligent control of smart inverters. This demonstration project will provide important references for Taiwan government to pursue more aggressive renewable energy project for the promotion of green energy.
Transformer Management System
For the effective asset management of SG system, this project installs a TMS to monitor the operation status of distribution transformers and perform the real-time report to the master station for the abnormal conditions such as overloading or high temperature. The TMS is also integrated with the AMI subsystem to achieve the function of possible customer tampering detection. It can also support the customer load control for demand response and smart charging of electric vehicles to prevent the transformer overloading problem.
Advanced Metering Infrastructure
For the AMI system, this project coordinates with the AMI vendors to perform the testing of smart meters, in-home display (IHD), data concentrator unit (DCU) and AMI header. The demand response management system (DRMS) with distributed system architecture is installed to integrate with the energy service provider (ESP) to support the identification of customer load profiles and the execution of customer load control when the power system encounters the service shortage problem. This project completes the installation and testing of 200 smart meters with hybrid communication, one set of energy service system and cover 130 smart homes.
Chao-Shun Chen has been with I-Shou University as a chair professor and with National Sun Yat-Sen University as a joint professor since 2008. He was a professor at National Sun Yat-Sen University (1984 to 1994), worked for Empros Systems International (1989 to 1990), and has been the Deputy Director General of the Department of Kaohsiung Mass Rapid Transit since 1994. He was formerly a professor with the National Taiwan University of Science and Technology (1997 to July 1998), and was a professor with National Sun Yat-Sen University (1998 to January 2008). He received a B.S. degree from National Taiwan University in 1976, and M.S and Ph.D. degrees in electrical engineering from the University of Texas at Arlington in 1981 and 1984, respectively
Chia-Hung Lin is presently a full professor at National Kaohsiung University of Applied Sciences. His areas of interest are distribution automation and computer applications to power systems. He received a B.S. degree from National Taiwan Institute of Technology in 1991, an M.S. degree from the University of Pittsburgh in 1993, and a Ph. D. degree in electrical engineering from the University of Texas at Arlington in 1997.
Te-Tien Ku is presently an assistant professor at National Penghu University of Science and Technology. He received M.S. and Ph. D. degrees in electrical engineering from National Sun Yat-Sen University in 2006 and 2012, respectively. His areas of interest are smart grid and applications to distribution systems.
Cheng-Ting Hsu is currently a professor of electrical engineering at Southern Taiwan University, Yung-Kang City, Taiwan. From 1990 to 1992, he was a power electronics engineer with Phoenixtec Power Company Limited, Taipei, Taiwan, developing uninterruptible power supply equipment. He received B.S., M.S., and Ph.D. degrees in electrical engineering from National Sun Yat-Sen University, Kaohsiung, Taiwan, in 1986, 1988, and 1995, respectively.