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Nowadays, the solar power systems are quickly developing in many countries to replace the fossil power sources and mitigate the environment pollution. The working efficiency of the power conditioner system in the solar power system is not high because the energy supply from solar array depends on the weather. The utilization rate of the power conditioner system can be increased by supplementing the...
This paper proposes a fast voltage control scheme including synchronous generators and static var compensators (SVCs) for power systems with high penetration of wind power. The scheme is able to reduce the fast voltage variations and improve the post-fault voltage dynamics. Taking an industrial power system with high penetration of wind power as an example, a reduced system model has been derived...
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...
This paper presents comparative evaluation and explores the different technologies suitable for the implementation of the Medium Voltage Direct Current (MVDC) electrical supplies for the marine on-board electrical distribution network. To realize the MVDC supply in the range from 5 kV to 25 kV, various technological choices are available during the design process and have a direct influence on the...
The PV generation application on traction system contributes to promote the nearby accommodation of PV energy and the energy-saving and emission-reduction of traction system. This paper proposed three-phase approach and back-to-back approach for PV generation application on AC powered traction system. Corresponding control principles and energy management strategies were also discussed. The PV energy...
With the global trend of restructuring in electricity market, providing affordable, reliable and quality electric power by service providers to customers the end users of electric energy are of immerse concern. Several initiatives have been taken by utilities to improve power quality in low voltage electric power distribution network but the inadequate operation/performance of the conventional compensation...
This paper focuses on a possible evolution of the control architectures suitable for Integrated Power Systems in modern all-electric ships. In control systems there is a major trend in using information and telecommunication technology as general real-time operating systems and standard communication protocols. This trend leads a standardization at software and communication protocol level that is...
In this paper, we design a controller using H infinity control theory and examine its frequency fluctuation suppressing performance in a small-scale system composed of real machines. The introduction of distributed power sources such as solar power generation and other sources of natural energy into smart power grids has been increasing in recent years. However, given that the amount of power generated...
To meet the power demand for multi-U CubeSat from 1U up to 20U, a kind of innovative modular electric power system(EPS) is designed and verified. The system can convert three independent photovoltaic power inputs with each channel up to 40Watts, and the maximum power point (MPP) for each channel can be set independently by hardware. The solar power is converted and stored in lithium-ion batteries...
In the signal phase AC traction power supply system, usually use automatic passing neutral section to maintain load balances of three-phase system, but the automatic passing neutral section is easy to produce overvoltage in power system, it severely imperils the safety of electric system and equipment. Therefore, it is necessity to carry on the analysis to the electromagnetic transient process of...
LEO Satellites equipped with high-power microwave payloads bring special demands for fast charging of Lithium ion battery. However, charging polarization occurs in traditional constant current-constant voltage strategy for Li-ion battery, following by comparative long charging time. To realize fast charging of batteries, novel Li-ion battery fast charge topology and principle were present based on...
In a Smart Grid environment measurements from remote sensors are telemetered to control centers and serve as input to many energy management applications. This, on one hand, has increased efficiency and reliability but at the same time has left the system exposed to cyber threats. This paper reviews the possibilities of such attacks and the impacts these might have on different power system operations...
The impact of stochastic excitation in the operation process of power systems is becoming more and more serious. In this paper, the stochastic model of the single machine infinite bus power systems with automatic voltage regulator (AVR) was established. The stability of the power system and the relationship between the parameters and stochastic excitations were discussed. The conditions for the mean...
In this study a family of Nine-Switch Converters is observed. In proposed circuits intermediate DC-link elements interface input and output converter parts through a nine-switch matrix chain. Such approach allows achieving step-up voltage capability with low THD index. The article gives general information about principle of operation and possible control strategies, considers basic performances and...
For decades, high voltage alternating current (HVAC) has been the more conventional method of power delivery. With recent advances in power electronics, high voltage direct current (HVDC) is an established technology in long-distance bulk power transmission. It is re-emerging to be the better option due to improved system operation and better support in the development of onshore and offshore transmission...
The focus of this paper is the online load flow optimization of power systems in closed loop. In contrast to the conventional approach where an AC OPF solution is computed before being applied to the system, our objective is to design an adaptive feedback controller that steers the system in real time to the optimal operating point without explicitly solving an AC OPF problem. Our approach can be...
Increasing penetration of converter-based generations in power system has led to new system challenges. Short circuit power response from converter-based generations is different from that of traditional synchronous generators. Power electronic converters can be designed for over-current only up to 1.1–1.25 times of its nominal value. Low availability of short circuit power can cause many challenges...
There are presented the results of the research of the efficiency of multi-agent management of voltage mode in electric grids, diagrams of power delivery of power stations. In the structure of devices for voltage regulation in a controllable area, there was considered the use of the normalizer of AC voltage, in particular as the means of emergency control, controlling the stability of motoring load...
The article considers algorithms of operating the multiphase unit for balancing main load based on selection of load phase connection to electric network phases with retaining an original order of load phases interlace. The influence of the operating algorithms on the load asymmetry coefficients of zero and negative sequences at the electrical point is analyzed based on computer modeling the treed...
Quasi-Static-Time-Series (QSTS) simulation is a technique widely used in planning and research to evaluate the power system's behavior in daily, yearly and other time frames. This simulation technique has become increasingly relevant due to the interconnection of Distributed Energy Resources (DER) and unconventional loads into the power grid. It models the control actions performed by devices such...
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