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.
Due to the rapid increase in biological data dimension and acquisition rate, the traditional analysis methods are unable to achieve acceptable accuracy. Recently, Deep learning technologies have shown outstanding results in many domains; especially in pattern recognition in the field of bioinformatics. In this paper, we provide background of what deep learning and its frameworks. In addition, we review...
Hot reserved redundant sub-modules significantly increase the reliability of MMC systems equipped with considerable sub-modules. This paper presents a fault-tolerant operation scheme for an MMC with a distributed control architecture. The MMC output, internal dynamics and the average capacitor voltages are balanced and well-regulated while asymmetrical sub-modules in arms are bypassed due to faults...
Compared to conventional L filters, LCL filters and LLCL filters have better high-frequency harmonic attenuation ability with less total inductance. However, one or two more magnetic cores are commonly demanded for grid-side and paralleled trap inductors. To further reduce the weight and volume of filter inductors, magnetic integration technique is an effective way. For conventional integrated LCL...
Renewable energy generators, e.g. wind turbines and photovoltaic (PV) arrays, have been increasingly employed to replace conventional gas/steam turbines so as to reduce greenhouse gas emission. However, such generators are normally coupled to the power grid through fast-response power converters without any inertia, leading to decreased power system inertia. As a consequence, system frequency deviations...
Fault tolerant operation can significantly improve the reliability of a Modular Multilevel Converter (MMC), but the precondition is that a fast and accurate fault detection and localization method has been embedded into the MMC control system. This paper proposes a fault diagnosis method used in a distributed control architecture, which makes the local controllers capable of identifying the switching...
This paper addresses design consideration on Battery Energy Storage System (BESS) sizing of Hybrid Electric Marine Vessel. Different size of BESS is simulated to assess fuel consumption of the vessel, charge/discharge peak power of the BESS, and equivalent life cycle of the BESS used. To determine power contribution between generators and BESS, a Power Management System (PMS) is designed based on...
This paper explores the frequency instability mechanism in modern power electronics-based power systems. It is revealed that the lack of damping and inertia together with the slow response of the frequency regulator should be responsible for frequency instability issues. As a result, three possible solutions targeting at damping enhancement, inertia emulation, and response acceleration are employed...
In this paper, distributed energy storage systems (DESSs) for power system frequency regulation are investigated. Due to the fact that above 95% of the electricity in Singapore is generated by combined cycle gas turbines (CCGTs), the system frequency model of Singapore based on CCGT is developed. The DESSs are utilized for system frequency regulation hierarchically. At the decentralized control level,...
In order to overcome the ever-challenging environmental issues such as the greenhouse gas emission, traditional energy sources are gradually being replaced by renewable energy sources. However, the increasing penetration of renewable energy sources leads to the decrease of power system inertia, as renewable sources barely contribute to inertial response. To tackle this problem, a hybrid energy storage...
The ISO/IEEE 11073-PHD series of standards were produced to standardize Personal Health Devices and allow the interoperability among medical devices. To meet different customers' needs, some manufactures perform some customizations based on the common basis established by aforementioned standards. However, little attention has been paid (or no work has been done) so far to analyze the status and trend...
Technology development for point-of-care viral pathogen detection is critical for early diagnosis of infectious diseases, and rapid and effective disease intervention. In this paper, we present the development of a zinc oxide nanorod-integrated microdevice for highly sensitive and specific detection of avian influenza virus. This multiplexed immunofluorescence platform takes two advantages of the...
The increasing scale and capacity of power grid will lead to the increase of short-circuit current (SCC) level of the buses, which poses threats to the safe and stable operation of power grid. This paper proposes a dynamic partitioning technology for dynamically adjusting power grid partition structure by means of line-switching and load-transferring aiming at the problem of excessive SCC of buses...
Distributed static series compensator (DSSC) is a new type of distributed FACTS devices that can realize accurate control of power flow and enhance voltage stability. Thus, it could be installed in stability-limited transmission systems widely. This paper presents a new capacity control model for DSSCs and deduces the corresponding power flow equations. To illustrate the effect on system power voltage...
The maximum efficiency point tracking (MEPT) control strategy has been adopted in state-of-the-art wireless power transfer (WPT) systems to meet power demand with the highest efficiency against coupling and load variations. Most of the MEPT implementations use dc/dc converters to regulate the output voltage and maximize the efficiency at the expense of increased system complexity. Other implementations...
In the power grid lacking conventional power sources for black start, adopting wind farm as a power source for black start is a beneficial attempt. With Jangsu local power grid as research object in China, and combining with the special geographical and demand of the local power grid, a black start scheme using permanent-magnet synchronous generator(PMSG)-based wind farm as black start power is proposed...
This paper explores the interconnection of multiple microgrid with “tie-line”. Tie-line control can be managed to control the power flow from microgrid and voltage at respective microgrid buses at the point of interconnection. Formation of such DC microgrid cluster ensures higher reliability of power supply and flexibility to manage distributed energy resources and loads in the system. Two identical...
In order to solve the voltage over-limit problem of distributed photovoltaic(PV) connected to string lines, it is feasible to fully utilize the reactive power regulation ability of PV systems to adjust the line's voltage. In this paper, based on analyzing the mechanism of the point of interconnection(POI) of PV systems voltage over-limit and the voltage sensitivity of low-voltage string lines, a reactive...
A bipolar dc microgrid features three voltage levels and is capable of transmitting power more efficiently than a unipolar system. This paper proposes a droop control to achieve load sharing and voltage balancing in such a microgrid system. Droop control is adopted to ensure that autonomous sharing of load power can be realized without communication. Moreover, the positive and negative pole voltages...
The point of common coupling (PCC) voltage feedforward is widely employed for LCL-type grid-connected converters to prevent the large inrush current during startup and suppress the disturbance of the grid voltage, etc. However, this feedforward loop is usually ignored in the system modeling and stability analysis for simplicity. Such an assumption may not be valid under weak power grids and can even...
Distributed Static Compensators (DSTATCOM), composed of power converters and passive filters, have been extensively utilized in the distribution system to improve its power quality (PQ). For selection of passive filters, the LCL filters are increasingly employed to replace the conventional L filters. However, the LCL filters are normally designed for the application of grid-connected inverters (GCI),...
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.