The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
High degree penetration of residential rooftop Photovoltaic (PV) systems will cause the overvoltage problem in power distribution system. In this study, a real-time overvoltage prevention control realized by multi-agent based community energy management system (CEMS) is proposed. The main concept of the proposed control is to suppress the overvoltage by managing the operation schedule of household...
In a modern transmission system, wide area monitoring system (WAMS), which is capable to perform real time monitoring and control, is employed. State estimation process using PMU data is one of the important parts in WAMS since the current operating condition of the power system should be represented precisely. Practically, the measurement errors due to the communication congestion are existed and...
For stable operation of power system, preventive control based on security constraint optimal power flow is widely applied. Other than line contingency, recent penetration of renewable energy could become new threat, especially for the voltage stability issue. However, consideration of renewable energy uncertainty would increase the number of system states that should be considered in the preventive...
Wide Area Monitoring System (WAMS) with Phasor Measurement Unit (PMU) has the capability to do real time monitoring including fast system condition changes. On the other hand, Supervisory Control and Data Acquisition (SCADA), which is vulnerable to that condition, are still widely used in wide world power system because of its capability and maturity. This paper proposes the framework in transforming...
Due to recent growth of small-scaled distributed generators such as PV in demand-side, the local demand and supply system that called MG, becomes real possibility. MGs would be equipped with energy storage systems such as a battery. Since PVs and batteries primitively work with DC, advantages of DC supply system over AC supply might be emphasized. This paper proposes an algorithm for optimal design...
Demand response (DR), is one of attractive options for the end-users such as commercial buildings (COBUs), residences, and industrial facilities. In a COBU, the most popular adjustable demand is a chiller system used in heating, ventilation and/or air conditioning loads, which can achieve load reduction in a specified duration by means of pre-cooling (time- shift of chiller operation). On the other...
nowadays, power system tends to be operated in heavily stressed load, which can cause voltage stability problem. Moreover, occurrence probability of contingency is increasing due to growth of power system size and complexity. This paper proposes a new preventive control scheme based on voltage stability and security monitoring by means of wide area monitoring systems (WAMS). The proposed control scheme...
A surge of needs for the low carbon society promotes a spread of electric vehicle (EV). EVs could be charged at night simultaneously, as a result, severe voltage drop may happen. The authors have proposed the method which can compensate the voltage drop caused by EV charging by means of adjusting charging schedules and controlling reactive power. However, though the method can avoid the voltage violation,...
One of the promising contributions from end-users such as commercial buildings (CBs), residences and/or factories is demand response (DR) in which the end-users reduce their electricity consumption upon a request from the utility. In CBs, consumption is reduced by fully or partially shutting down the chiller systems used in heating, ventilation and/or air conditioning (HVAC) loads. On the other hand,...
New PMU placement algorithm considering network connectivity, zero injection bus, reliability of N−1 line contingency and voltage stability performance (enhancing Voltage Stability Index) are proposed in this work. Reliability and voltage stability level are selected to determine the security level of Wide Area Monitoring System and priority bus. Optimization problem is formulated by minimizing the...
The Ministry of the Environment of Japan is promoting a demonstration project named "wide-area operation systems for multiple renewable energy (RE) power plants" in which the authors have been devoted. In this project, the generation outputs from five RE power plants are monitored online and the fluctuation in total output is absorbed by a combination of three different energy storage systems...
In recent years, distributed generators (DG) with renewable energy (RE) are introduced to electric power systems for saving CO2 emission. Installation of DGs in user-side leads to the local demand and supply system, called microgrids (MGs). Since the some of DGs work in DC, advantages of DC supply system over the AC might be emphasized The authors are investigating the merits of DC microgrid (DCMG)...
The Ministry of the Environment of Japan has promoted the demonstration project named “wide-area operation systems for multiple renewable energy power plants”. The purpose of wide-area operation system is to stabilize the total generation output of photovoltaic (PV) power plants and wind farms using energy storage systems (ESSs) and a controllable renewable energy (RE) generator based on the weather...
A surge of needs for the low carbon society promotes a spread of electric vehicle (EV). EVs could be charged at night simultaneously, as a result, severe voltage drop may happen. Typical charger for EV employs the self-commutated inverter, which can control both active and reactive powers in principle. The authors are investigating the availability of EVs for the distribution system operation qualitatively,...
Challenges for the low carbon society has brought a spread of electric vehicles (EVs). Most of EVs could be charged at night simultaneously. That could cause severe voltage drop along the feeder. On the other hand, EVs are able to inject/absorb reactive power by using interfacing inverter in principle. This paper proposes active and reactive power management which can regulate feeder voltages in the...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.