About
77
Publications
6,541
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
582
Citations
Publications
Publications (77)
Optimal Scheme for Remote Island Power System considering PV Forecast Error (2025 Annual Meeting IEEJ) 日本の離島電力系統では,ディーゼル発電機(DG)によって電力供給が行われてきた。また,近年の太陽光発電(PV)システムの普及によってPVの予測誤差の影響が増加し,供給予備力の不足や需給インバランスが問題となっている。本研究では,当日にPV出力の予測を繰り返し更新し,数分ごとに発電機起動停止計画を再立案することによって,不確実性による予測誤差の影響に即時対応できるような計画手法を提案した。シミュレーションでは,最大負荷が大きい淡水化装置が稼働しても,蓄電池によってDG追加起動を要求せず,重負...
Optimal Joint Planning of Technology Selection, Capacities Planning, and Operation Scheduling for Demand-Side Energy System considering Dynamics of Heat Pump Water Heater and Linkage of Electricity, Heat, and Water (Jxiv)
Heat pump water heaters (HPWHs) are attracting considerable attention as a pivotal renewable energy technology for achieving ca...
Increasing integration of inverter power sources into the electrical power system has raised concerns about a lack of system inertia, leading to potential disturbances in system frequency and speed during grid disruptions. Virtual synchronous generator (VSG) control is a promising solution for inertia support of the electrical power system. VSG's i...
Electric power systems with increasing photovoltaic (PV) systems face concerns regarding degradation in frequency stability due to heightened output forecast errors. As a countermeasure, given the dynamic factors like demand, PV output, and meteorological elements, calculating the optimal reserve margin (ORM) becomes crucial for economic efficiency...
Research on energy management systems for microgrids up to recent years has covered a wide range of time scales, equipment, and services. However, the roles and purposes of consumers and aggregators targeted in these studies are scattered, making it difficult to apply them to the actual construction of microgrids. This study comprehensively deals w...
Integrating Grid-Following Inverters (GFLs) into power systems presents significant stability challenges, particularly in systems with reduced strength and high renewable energy penetration. This study delves into the dynamic interactions between parallel synchronous generators (SGs) and GFLs, highlighting the impact of reduced system inertia and t...
Traditional inverters in isolated power systems use Constant
Voltage Constant Frequency (CVCF) control to maintain stable
voltage and frequency, making them suitable for standalone
applications but limiting their use in grid-connected systems due to
a lack of synchronization capabilities[1]. Conversely, Grid
Following Inverters (GFL) can synchr...
This paper introduces a DC-link fault detection and synchronization control strategy for grid-forming inverters in hybrid DC/AC microgrids, aiming to bolster system stability and reliability. The proposed control scheme seamlessly integrates DC-link fault detection with virtual synchronous generator (VSG) control, facilitating inertia emulation and...
Integrating Grid-Following Inverters (GFLs) into power systems poses significant challenges in maintaining system stability and ensuring reliable power sharing. This study examines the factors influencing GFL stability and integration by analysing the interactions between parallel synchronous generators (SGs) and GFLs operating. The study uses math...
Increasing integration of inverter power sources into the electrical power system has raised concerns about a lack of system inertia, leading to potential disturbances in system frequency and speed during grid disruptions. Virtual synchronous generator (VSG) control is a promising solution for inertia support of the electrical power system. VSG’s i...
The absence of the phase-locked loop (PLL) in grid-forming GFM inverters due to its instability issues brings a problem of lack of a detecting unit for GFM control. This paper studies the DC bus controller for grid fluctuation detection and control. The control is done using a DC bus controller which calculates the required power reference for the...
There is a growing concern about increasing data center (DC) power consumption, and addressing it requires increased use of renewable energy sources (RE). However, a major challenge is that renewable energy output fluctuates. Therefore, proposed CPU speed control to optimally design photovoltaic systems and storage batteries for RE100% DC, and prop...
Recently, CO2 emissions have increased, and energy generation accounts for 42.5% of worldwide CO2 emissions, making it a serious problem owing to global warming and environmental change. To address this, power-generating units are increasingly aiming to reduce emissions while minimizing costs. The primary goal of this research is to develop a compl...
In recent years, there has been a notable rise in the integration of solar PV-based sources into the electricity markets, driven by ongoing electricity market reforms and various initiatives, including the FIT scheme. As a result, energy aggregation is gaining momentum, and aggregators will facilitate the sale of residential PV energy within electr...
Optimal Demand-Supply Scheduling Considering PV Penetration and Securing ESS Reserve Power for Remote Island Power System Including Desalination Unit (2024 Annual Meeting IEEJ) 外部との連系線を持たない離島電力系統ではディーゼル発電機(DG)により島内需要を賄っている。しかし,高額な燃料単価と保守点検費が経済的負担を増大させている。また,島民のライフラインとして機能する淡水化装置(DU)の最大負荷は大きく,その運転計画を考慮した電力供給運用を行うことが重要である。本稿では,これらに加えてPV導入・ESS予備力確保を考慮...
The absence of the phase-locked loop (PLL) in grid-forming GFM inverters due to its instability issues brings a problem of lack of a detecting unit for GFM control. This paper studies the DC bus controller for grid fluctuation detection and control. The control is done using a DC bus controller which calculates the required power reference for the...
This study focuses on the development of an energy management system (EMS) for a microgrid (MG) that prioritizes balanced demand-supply operation to accommodate the stakes of distribution system operator (DSO), consumers (CNSs), and aggregator (AGR). An innovative EMS model for MG is introduced, which integrates power interchange (PIC) through elec...
The integration of photovoltaic (PV) systems is continuously gaining ground with increasing installation in many nations. Decentralized PV systems could be connected in a centralized or decentralized manner each having different advantages and disadvantages. However, the AC grid stability of the PV Integration under these two connection strategies...
Proposal of Preliminary Study Framework for Regional Microgrid Construction (2023 Annual Meeting IEEJ) 国内外においてマイクログリッド(MG)への関心は高まっており,様々なMGの構築やその運用形態などが議論されている。資源エネルギー庁が提唱する地域MG構築フローにおける事前検討の段階では多種多様な地域MGの必要性・目的・概要の検討を行える汎用的な枠組みの構築が望まれる。本稿では,事前検討フレームワークとしてMFSVSサイクルを提案し,これを使用した地域MG構築の事前検討の例を示す。福井県越前市内の仮想3地域へ家庭用蓄電池システムを導入して地域MG構築を行う場合の事前検討の結果,コストの面を重...
The virtual synchronous generator (VSG) has been used to provide emulated inertia to inverter-based resources (IBR). The DC bus voltage and current variations due to changes in the AC load power fluctuations are neglected in the VSG control. Whereas, the DC bus response phenomenon can be used to improve the VSG performance. To improve the VSG contr...
Optimization Problem of Local Power Supply and Demand by Cross-Regional Power-Interchange for Diversified Aggregation Businesses (Joint Technical Meeting on Power Engineering/Power Systems Engineering/Semiconductor Power Converter) 系統運用管轄者とその目的が多様化・複雑化するアグリゲーションビジネスの展開のためには,目的関数が一般化された最適化問題が必要となる.加えて,エネルギーマネジメントのためのVPPやDRの必要量や貢献度,その向きが検出できる必要もある.本研...
Conventional grid-following (GFL) inverters are synchronized through the phase lock loop (PLL) control. The PLL is essential for the grid frequency and the phase angle calculation. However, the synchronization of the GFL using the PLL control introduces stability issues, especially in weak grids and inverter-dominated systems. This could lead to la...
In traditional power system based mainly on synchronous generators (SG), frequency control was done either by increasing or decreasing the steam in the case of steam generators or the opening and closing of the water flow valves in the case of hydro generator systems. This fundamental control strategy has been used over the years to maintain the st...
For the carbon neutral society, installation of renewable energies is increasing. In particular, expectations for Wind Turbine Generator Systems (WTGSs) have raised in Japan. However, since output of the WTGSs fluctuates, it may cause difficulty in the operation of the electric power system, such as reduction of frequency stability by the imbalance...
Preliminary Study about Net Load Power Leveling by Energy Storage System and Power Interchange in Energy Supply and Demand Model in Regional System (Joint conference of Hokuriku chapters of Electrical and Information Societies 2022) 太陽光発電(PV)の余剰電力の発生および電気自動車(EV)の充放電の地理的・時間的な集中などによる地域系統の負荷の不均衡が問題視されている.本研究では,蓄電池(ES)の運用のみならずEVの充放電により地域系統間の電力融通(IC)を行い...
A virtual battery (VB) model is proposed in this paper to facilitate in the management of a smart microgrid. A cluster of controllable load and generations (CLGs) is referred to as VB, and it operates similarly as the battery storage that reduces the size of the energy storage device (ESS). Aggregators use the VB to distribute power among CLGs when...
This research proposes a smart microgrid installation and operation for an island by introducing ship's generators as a backup generator. On a small island, it is challenging to run big loads such as tower cranes and big motors, which are very necessary for the island's industrial development. Besides, photovoltaic (PV) and wind turbine generator (...
Renewable energy sources (RESs) contribute not only to securing sustainable resources but also mitigates environmental issues. However, a massive installation of RESs causes problems such as voltage deviation, reverse power flow, frequency fluctuation, and etc., hence, RESs high penetration is restricted and several problems remain in the fusion of...
The Virtual Synchronous Generator (VSG) can give virtual inertia and imitate primary control of the synchronous generator. This paper focuses on grid-following (GFL) type VSG for easy parallel operation compared to voltage source inverter. The grid frequency support of GFL-VSG can be achieved by controlling active power output using frequency devia...
Global activity for a sustainable society has encouraged the transformation of the power system from synchronous generator-based generation to a massive integration of variable renewable energy (VRE) generation interfaced by power electronic converters. This transformation comes with stability concerns such as low-Nadir and a high rate of change of...
The need for sustainable energy has led to an increasing number of renewable energy installations. As a result, the power system has experienced a global energy transition from fossil-based systems such as oil, coal, and natural gas-powered through synchronous generators to renewable energy sources like solar, wind, and battery which are interfaced...
Renewable energy (RE) are interfaced to the power system through inverters. These inverters can either be controlled as a current source known as grid following (GFL) or as a voltage source known as grid forming (GFM). The massive integration of RE through PEC may cause stability problem. This paper examines the best inverter control for a low iner...
High penetration of photovoltaic (PV) power generation systems is restricted due to the risk of a critical stability decline of the power system. The stability decline has been caused by the power supply/demand imbalance due to the mismatch between photovoltaic power generation and load demand, and exceedance of generators ramp up/down rate with ne...
This article proposes a plan to replace real-time power with constant power from the grid to reduce costs and reduce the impact of the micro-grid on the main grid at the same time. Most of the peak electricity consumption periods of universities or some enterprise institutions are during the daytime. If solar energy can be used reasonably at this t...
Penetration of equipment such as photovoltaic power generations (PV), heat pump water heaters (HP), and electric vehicles (EV) introduces voltage unbalance issues in distribution systems. Controlling PV and energy storage system (ESS) outputs or coordinated EV charging are investigated for voltage unbalance compensation. However, some issues exist,...
This paper presents a compensation method for unbalanced voltage through active and reactive power control by utilizing a smart inverter that improves the voltage unbalance index and detects an unbalanced state of voltage magnitude and phase, and thus enhances power quality by minimizing the voltage imbalance. First of all, this paper presents an a...
This paper presents a novel design scheme to reshape the solar panel configuration and hence improve power generation efficiency via changing the traditional PVpanel arrangement. Compared to the standard PV arrangement, which is the S-shape, the proposed M-shape PV arrangement shows better performance advantages. The sky isotropic model was used to...
This paper deals with the comparison approach of operational cost and consumer efforts for the smart grid system. There are two objectives considered for the smart power system i.e. the minimization of the operational cost and consumer efforts of demand responses. Normally, consumers do not want to make much effort for reducing or increasing their...
A number of studies realized operation of power systems are unstable in developing countries due to misconfiguration of distribution systems, limited power transfer capability, inconsistency of renewable resources integration, paucity of control and protection measures, timeworn technologies, and disproportionately topology. This study underlines a...
Voltage stability analysis and improvement remain a major concern of power system operators due to the recurrent risk of voltage collapse. Many approaches have been used to analyze voltage stability but an approach that can directly indicate the closeness of power system to voltage collapse can be used to optimally plan for the improvement of the p...
Power sector, as one of the least progressed division, is limiting the socioeconomic development in Afghanistan. Although the country has a vast solar energy potential with a bright prospect for growth, however inadequate endorsement and attention have prevented its proper use. Meanwhile, Kabul the capital city and one of the fastest growing cities...
The rapid growth of renewable energies specifically wind and solar with their intermittent phenomena has recently become an exciting and important topic among researchers worldwide. The integration of such devices in distribution networks comprising of battery energy storage systems (BESSs) is considered as efficient and complementation approach wh...
Combating climate change issues resulting from excessive use of fossil fuels comes with huge initial costs, thereby posing difficult challenges for the least developed countries in Sub-Saharan Africa (SSA) to invest in renewable energy alternatives, especially with rapid industrialization. However, designing renewable energy systems usually hinges...
Extension of renewable energies in power system planning and operation especially distribution networks is not limited to power sustainability. It also encompasses many significant contributions such as eliminating electricity shortages by diversifying energy supply, improving reliability with power quality, reducing greenhouse gas emissions, and p...
The quest for economic growth has led to increase in world's energy consumption and to meet this continuously widening energy gap, high penetration of variable energy resources (VER) into the energy mix of countries all over the world is being encouraged. However, there is a limitation on the capacity of existing transmission facilities and the pow...
In order to solve urgent energy and environmental problems, it is essential to carry out high installation of distributed generation using renewable energy sources (RESs) and environmentally-friendly storage technologies. However, a high penetration of RESs usually leads to a conventional power system unreliability, instability and low power qualit...
The quest for industrialization and economic empowerment has led to increasing load demand in developing countries like Nigeria. However, existing transmission and generation capacity is limited and outdated; hence power systems are at risk of collapse. Introduction of localized utility-scale renewable energy technology has been identified as a way...
This study proposes the application of combinatorial multi‐objective optimisation (MOO) in an electrical power distribution system. Conventional electrical power systems do not consider reverse power flow, in which the power flows toward the feeder in the distribution system. However, reverse power flow toward the substation transformer is caused b...
The need for Sierra Leone, like every other country in Sub-Saharan Africa, to improve its electricity supply in order to enhance energy access for all thereby improving economic growth has become imminent. With a small population of about 7 million, the daily supply is not guaranteed and is far below the demand. With the huge renewable energy poten...
In the future, the limit of power transmission handling capability of power systems will be violated due to the pursuit of economic benefit and increase penetration of renewable energy resources. Hence, the likelihood of voltage instability and system’s risk of experiencing voltage collapse has increased. The voltage stability analysis remains a maj...
Japan contains a vast number of isolated islands. Majority of these islands are poweredby diesel generators (DGs), which are operationally not economical. Therefore, the introduction of renewableenergy systems (RESs) into these area is very much vital. However, the variability of RESs asa result of weather condition as well as load demand , battery...
High penetration of distributed generators (DGs) using renewable energy sources (RESs) is raising some important issues in the operation of modern power system. The output power of RESs fluctuates very steeply, and that include uncertainty with weather conditions. This situation causes voltage deviation and reverse power flow. Several methods have...
Due to the liberalization of electric power market, many power producers are entering into the power market. Most of electric power company have been introduced renewable energies that might increase the power system uncertainty. Therefore, it is expected that rise might the likelihood of voltage instability and voltage collapse. In addition, fluct...
Distributed generators (DG) using renewable energy sources (RESs) have been attracting special attention within distribution systems. However, a large amount of DG penetration causes voltage deviation and reverse power flow in the smart grid. Therefore, the smart grid needs a solution for voltage control, power flow control and power outage prevent...
This paper proposes an application of multi objective optimization method in a smart grid. Recently, smart gird problems has become more diversified and complex which cannot be solved by single objective optimization method. Technical, economical, and placement problems of control devices should also be considered as required. The technical and eco...
Distributed generation based on renewable energy sources (RES) continues to increase in electric power system penetration. In order to mitigate stability issues caused by high penetration of these weather-dependent systems, some type of control is necessary. This paper proposes a method to model heat pump water heaters (HPs) and battery systems for...
A recent trend of the power system is the ever increasing number of distributed generators (DGs) utilizing renewable energy sources, which have output powers that fluctuate due to unpredictable weather and ambient conditions. This causes fluctuations in system frequency and bus voltages, resulting in poor quality power, higher prices for electricit...
Distribution generator (DGs) using renewable energy sources (RESs) has introduced in the distribution system from economy and the environment issues. However, high DGs penetration in distribution system cause voltage deviation beyond the statutory range and also reverse power flow toward the substation and generator. It is necessary to introduce th...
Distributed generators (DG) and renewable energy sources have been attracting special attention in distribution systems in all over the world. Renewable energies, such as photovoltaic (PV) and wind turbine generators are considered as green energy. However, a large amount of DG penetration causes voltage deviation beyond the statutory range and rev...
In order to protect the environment and allow self-supported energy in isolated situations, distributed generators (DGs) using renewable energy sources (RESs) have been introduced in distribution system. High DG penetration in distribution systems causes voltage deviation and also reverses power flow toward substations and generators. Some research...
This paper proposes the application of multi-objective optimization to step voltage regulators in a distribution system. Conventional electrical power systems do not consider reverse power flow, in which the power flows toward the feeder in the distribution system. When large quantities of distributed generators (DGs) are introduced into a distribu...