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Inertia reduction due to inverter-based resource (IBR) penetration deteriorates power system stability, which can be addressed using virtual inertia (VI) control. There are two types of implementation methods for VI control: grid-following (GFL) and grid-forming (GFM). There is an apparent difference among them for the voltage regulation capability, because the GFM controls IBR to act as a voltage source and GFL controls it to act as a current source. The difference affects the performance of the VI control function, because stable voltage conditions help the inertial response to contribute to system stability. However, GFL can provide the voltage control function with reactive power controllability, and it can be activated simultaneously with the VI control function. This study analyzes the performance of GFL-type VI control with a voltage control function for frequency stability improvement. The results show that the voltage control function decreases the voltage variation caused by the fault, improving the responsivity of the VI function. In addition, it is found that the voltage control is effective in suppressing the power swing among synchronous generators. The clarification of the contribution of the voltage control function to the performance of the VI control is novelty of this paper.
Dai Orihara; Hiroshi Kikusato; Jun Hashimoto; Kenji Otani; Takahiro Takamatsu; Takashi Oozeki; Hisao Taoka; Takahiro Matsuura; Satoshi Miyazaki; Hiromu Hamada; Kenjiro Mori. Contribution of Voltage Support Function to Virtual Inertia Control Performance of Inverter-Based Resource in Frequency Stability. Energies 2021, 14, 4220 .
AMA StyleDai Orihara, Hiroshi Kikusato, Jun Hashimoto, Kenji Otani, Takahiro Takamatsu, Takashi Oozeki, Hisao Taoka, Takahiro Matsuura, Satoshi Miyazaki, Hiromu Hamada, Kenjiro Mori. Contribution of Voltage Support Function to Virtual Inertia Control Performance of Inverter-Based Resource in Frequency Stability. Energies. 2021; 14 (14):4220.
Chicago/Turabian StyleDai Orihara; Hiroshi Kikusato; Jun Hashimoto; Kenji Otani; Takahiro Takamatsu; Takashi Oozeki; Hisao Taoka; Takahiro Matsuura; Satoshi Miyazaki; Hiromu Hamada; Kenjiro Mori. 2021. "Contribution of Voltage Support Function to Virtual Inertia Control Performance of Inverter-Based Resource in Frequency Stability." Energies 14, no. 14: 4220.
As distributed power sources via grid-connected inverters equipped with functions to support system stabilization are being rapidly introduced, individual systems are becoming more complex, making the quantification and evaluation of the stabilizing functions difficult. Therefore, to introduce distributed power sources and achieve stable system operation, a system should be reduced to a necessary but sufficient size in order to enable the quantification of its behavior supported by transient theory. In this study, a system in which multiple distributed power supplies equipped with virtual synchronous generator control are connected is contracted to a two-machine system: a main power supply and all other power supplies. The mechanical torque of each power supply is mathematically decomposed into inertia, damping, synchronization torques, and the governor effect. The system frequency deviations determined by these elements are quantitatively indexed using MATLAB/Simulink. The quantification index displayed in three-dimensioned graphs illustrates the relationships between the various equipment constants of the main power supply, the control variables of the grid-connected inverter control, and the transient time series. Moreover, a stability analysis is performed in both the time and frequency domains.
Yuko Hirase; Kazusa Uezaki; Dai Orihara; Hiroshi Kikusato; Jun Hashimoto. Characteristic Analysis and Indexing of Multimachine Transient Stabilization Using Virtual Synchronous Generator Control. Energies 2021, 14, 366 .
AMA StyleYuko Hirase, Kazusa Uezaki, Dai Orihara, Hiroshi Kikusato, Jun Hashimoto. Characteristic Analysis and Indexing of Multimachine Transient Stabilization Using Virtual Synchronous Generator Control. Energies. 2021; 14 (2):366.
Chicago/Turabian StyleYuko Hirase; Kazusa Uezaki; Dai Orihara; Hiroshi Kikusato; Jun Hashimoto. 2021. "Characteristic Analysis and Indexing of Multimachine Transient Stabilization Using Virtual Synchronous Generator Control." Energies 14, no. 2: 366.
Deep penetration of distributed generators have created several stability and operation issues for power systems. In order to address these, inverters with advanced capabilities such as frequency and reactive power support the grid. Known also as Smart Inverters (SIs), these devices are highly dynamic and contribute to the power flow in the system. Notwithstanding their benefits, such dynamic devices are new to distribution networks. Power system operators are very reluctant toward such changes as they may cause unknown issues. In order to alleviate these concerns and facilitate SIs integration to the grid, behavior studies are required. To that end, this paper presents a power hardware-in-the-loop test set up and tests that are performed to study fault behavior of SIs connected to distribution networks. The details of the software model, SI integration with the real-time simulator, test results, and their analyses are presented. This experience shows that it is not trivial to connect such novel devices with simulation environments. Adjustments are required on both software and hardware fronts on a case-by-case basis. The encountered integration issues and their solutions are presented herein. The fault behavior of the SI with respect to the fault location is documented. It is observed that for faults that are close to SIs, momentary cessation of generation is observed. This needs to be tackled by device manufacturers as this phenomenon is very detrimental to health of a power system under fault conditions. Extensive PHIL test results show that several factors affect the fault behavior of an SI: fault location and its duration, SI mode of operation as well as extra devices housed in the casing. These results and their in-depth analyses are presented for a thorough understanding of SI behavior under fault conditions.
Taha Selim Ustun; Shuichi Sugahara; Masaichi Suzuki; Jun Hashimoto; Kenji Otani. Power Hardware in-the-Loop Testing to Analyze Fault Behavior of Smart Inverters in Distribution Networks. Sustainability 2020, 12, 9365 .
AMA StyleTaha Selim Ustun, Shuichi Sugahara, Masaichi Suzuki, Jun Hashimoto, Kenji Otani. Power Hardware in-the-Loop Testing to Analyze Fault Behavior of Smart Inverters in Distribution Networks. Sustainability. 2020; 12 (22):9365.
Chicago/Turabian StyleTaha Selim Ustun; Shuichi Sugahara; Masaichi Suzuki; Jun Hashimoto; Kenji Otani. 2020. "Power Hardware in-the-Loop Testing to Analyze Fault Behavior of Smart Inverters in Distribution Networks." Sustainability 12, no. 22: 9365.
The integration of smart grid technologies in interconnected power system networks presents multiple challenges for the power industry and the scientific community. To address these challenges, researchers are creating new methods for the validation of: control, interoperability, reliability of Internet of Things systems, distributed energy resources, modern power equipment for applications covering power system stability, operation, control, and cybersecurity. Novel methods for laboratory testing of electrical power systems incorporate novel simulation techniques spanning real-time simulation, Power Hardware-in-the-Loop, Controller Hardware-in-the-Loop, Power System-in-the-Loop, and co-simulation technologies. These methods directly support the acceleration of electrical systems and power electronics component research by validating technological solutions in high-fidelity environments. In this paper, members of the Survey of Smart Grid International Research Facility Network task on Advanced Laboratory Testing Methods present a review of methods, test procedures, studies, and experiences employing advanced laboratory techniques for validation of range of research and development prototypes and novel power system solutions.
Juan Montoya; Ron Brandl; Keerthi Vishwanath; Jay Johnson; Rachid Darbali-Zamora; Adam Summers; Jun Hashimoto; Hiroshi Kikusato; Taha Ustun; Nayeem Ninad; Estefan Apablaza-Arancibia; Jean-Philippe Bérard; Maxime Rivard; Syed Ali; Artjoms Obushevs; Kai Heussen; Rad Stanev; Efren Guillo-Sansano; Mazheruddin Syed; Graeme Burt; Changhee Cho; Hyeong-Jun Yoo; Chandra Awasthi; Kumud Wadhwa; Roland Bründlinger. Advanced Laboratory Testing Methods Using Real-Time Simulation and Hardware-in-the-Loop Techniques: A Survey of Smart Grid International Research Facility Network Activities. Energies 2020, 13, 3267 .
AMA StyleJuan Montoya, Ron Brandl, Keerthi Vishwanath, Jay Johnson, Rachid Darbali-Zamora, Adam Summers, Jun Hashimoto, Hiroshi Kikusato, Taha Ustun, Nayeem Ninad, Estefan Apablaza-Arancibia, Jean-Philippe Bérard, Maxime Rivard, Syed Ali, Artjoms Obushevs, Kai Heussen, Rad Stanev, Efren Guillo-Sansano, Mazheruddin Syed, Graeme Burt, Changhee Cho, Hyeong-Jun Yoo, Chandra Awasthi, Kumud Wadhwa, Roland Bründlinger. Advanced Laboratory Testing Methods Using Real-Time Simulation and Hardware-in-the-Loop Techniques: A Survey of Smart Grid International Research Facility Network Activities. Energies. 2020; 13 (12):3267.
Chicago/Turabian StyleJuan Montoya; Ron Brandl; Keerthi Vishwanath; Jay Johnson; Rachid Darbali-Zamora; Adam Summers; Jun Hashimoto; Hiroshi Kikusato; Taha Ustun; Nayeem Ninad; Estefan Apablaza-Arancibia; Jean-Philippe Bérard; Maxime Rivard; Syed Ali; Artjoms Obushevs; Kai Heussen; Rad Stanev; Efren Guillo-Sansano; Mazheruddin Syed; Graeme Burt; Changhee Cho; Hyeong-Jun Yoo; Chandra Awasthi; Kumud Wadhwa; Roland Bründlinger. 2020. "Advanced Laboratory Testing Methods Using Real-Time Simulation and Hardware-in-the-Loop Techniques: A Survey of Smart Grid International Research Facility Network Activities." Energies 13, no. 12: 3267.
Required functions of a microgrid become divers because there are many possible configurations that depend on the location. In order to effectively implement the microgrid system, which consists of a microgrid controller and components with distributed energy resources (DERs), thorough tests should be run to validate controller operation for possible operating conditions. Power-hardware-in-the-loop (PHIL) simulation is a validation method that allows different configurations and yields reliable results. However, PHIL configuration for testing the microgrid controller that can evaluate the communication between a microgrid controller and components as well as the power interaction among microgrid components has not been discussed. Additionally, the difference of the power rating of microgrid components between the deployment site and the test lab needs to be adjusted. In this paper, we configured the PHIL environment, which integrates various equipment in the laboratory with a digital real-time simulation (DRTS), to address these two issues of microgrid controller testing. The test in the configured PHIL environment validated two main functions of the microgrid controller, which supports the diesel generator set operations by controlling the DER, regarding single function and simultaneously activated multiple functions.
Hiroshi Kikusato; Taha Selim Ustun; Masaichi Suzuki; Shuichi Sugahara; Jun Hashimoto; Kenji Otani; Kenji Shirakawa; Rina Yabuki; Ken Watanabe; Tatsuaki Shimizu. Microgrid Controller Testing Using Power Hardware-in-the-Loop. Energies 2020, 13, 2044 .
AMA StyleHiroshi Kikusato, Taha Selim Ustun, Masaichi Suzuki, Shuichi Sugahara, Jun Hashimoto, Kenji Otani, Kenji Shirakawa, Rina Yabuki, Ken Watanabe, Tatsuaki Shimizu. Microgrid Controller Testing Using Power Hardware-in-the-Loop. Energies. 2020; 13 (8):2044.
Chicago/Turabian StyleHiroshi Kikusato; Taha Selim Ustun; Masaichi Suzuki; Shuichi Sugahara; Jun Hashimoto; Kenji Otani; Kenji Shirakawa; Rina Yabuki; Ken Watanabe; Tatsuaki Shimizu. 2020. "Microgrid Controller Testing Using Power Hardware-in-the-Loop." Energies 13, no. 8: 2044.
Variable distributed energy resources (DERs) such as photovoltaic (PV) systems and wind power systems require additional power resources to control the balance between supply and demand. Battery energy storage systems (BESSs) are one such possible resource for providing grid stability. It has been proposed that decentralized BESSs could help support microgrids (MGs) with intelligent control when advanced functionalities are implemented with variable DERs. One key challenge is developing and testing smart inverter controls for DERs. This paper presents a standardized method to test the interoperability and functionality of BESSs. First, a survey of grid-support standards prevalent in several countries was conducted. Then, the following four interoperability functions defined in IEC TR 61850-90-7 were tested: the specified active power from storage test (INV4), the var-priority Volt/VAR test (VV) and the specified power factor test (INV3) and frequency-watt control (FW). This study then out-lines the remaining technical issues related to basic BESS smart inverter test protocols.
Jun Hashimoto; Taha Selim Ustun; Kenji Otani. Smart Inverter Functionality Testing for Battery Energy Storage Systems. Smart Grid and Renewable Energy 2017, 08, 337 -350.
AMA StyleJun Hashimoto, Taha Selim Ustun, Kenji Otani. Smart Inverter Functionality Testing for Battery Energy Storage Systems. Smart Grid and Renewable Energy. 2017; 08 (11):337-350.
Chicago/Turabian StyleJun Hashimoto; Taha Selim Ustun; Kenji Otani. 2017. "Smart Inverter Functionality Testing for Battery Energy Storage Systems." Smart Grid and Renewable Energy 08, no. 11: 337-350.
The purpose of this study is to investigate concentrator photovoltaic (CPV) system performance. The performance of the CPV system depends on the climate and the environment condition more than the conventional flat-plate photovoltaic (PV) system. Moreover, the characteristic due to the angle of incidence (AOI) solar irradiance is extremely important. Therefore, the grid-connected PV and CPV systems installed in Japan are investigated to clarify these performance issues in this paper. The performance analysis results including performance ratio and alignment and tracking error data from one year of operation are presented and discussed.
Jun Hashimoto; Yanqun Xue; Kenji Otani; Matthew Muller; Sarah Kurtz. Performance of grid-connected conventional flat-plate and concentrator photovoltaic systems in Japan. Journal of International Council on Electrical Engineering 2015, 5, 23 -28.
AMA StyleJun Hashimoto, Yanqun Xue, Kenji Otani, Matthew Muller, Sarah Kurtz. Performance of grid-connected conventional flat-plate and concentrator photovoltaic systems in Japan. Journal of International Council on Electrical Engineering. 2015; 5 (1):23-28.
Chicago/Turabian StyleJun Hashimoto; Yanqun Xue; Kenji Otani; Matthew Muller; Sarah Kurtz. 2015. "Performance of grid-connected conventional flat-plate and concentrator photovoltaic systems in Japan." Journal of International Council on Electrical Engineering 5, no. 1: 23-28.