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For electric drive vehicles including electric vehicles, hybrid electric vehicles and plug-in hybrid electric vehicles a new battery/ultra-capacitor hybrid energy storage system (HESS) is proposed. The conventional HESS design uses a larger DC/DC converter to interface between the ultra capacitor and the battery/DC link to satisfy the real time peak power demands. The proposed design uses a much smaller...
Static Synchronous Compensator (STATCOM) is one of the typical FACTS device which is used to improve the voltage profile and transient stability in power system by damping the low frequency oscillation in it. This paper presents a self tuning PI controller for STATCOM in which the PI controller gains are adopted with the system load impedance by Back Propagation Algorithm. In order to overcome the...
The dc link voltage of the unified power quality conditioner (UPQC) is maintained at certain preset value during the steady state. However the dc link voltage can significantly deviate from its reference during a transient event, caused by load connection/disconnection or/and supply side voltage sag/swell. During such transients, due to significant deviation in the dc link voltage, the series injected...
Reactive power plays an important role in maintaining voltage stability, supporting real power transmission and overall system reliability. Thus, developing an accurate and feasible method for reactive power pricing is very significant in a deregulated electricity market. In this paper, the reactive power production cost of generator is represented as a nonlinear model that considers the corresponding...
The authors of [1] proposed the novel balancing technique of the sub module capacitor of Modular Multilevel Converter (MMC) which based on sorting of capacitor voltages, detection of current and the selection of the sub modules. In this paper the versatility of the balancing method has been checked by applying it to one of the applications i.e MMC -HVDC. The comprehensive simulations have been carried...
Presently, many industrial processes require high performance switching control of a number of inverter-fed induction machines. Multi-motor drives employ various methods to reduce complexity and minimize the cost. Independent control of motors is required as these motors are subjected to frequently changing operating conditions. Recent researches have ascertained the independent control of parallel...
In Radial Distribution Systems (RDS), the injection level of harmonics by non linear loads is high, due to continuous penetration of harmonic producing loads. Shunt capacitors play a vital role in enhancing the performance of Radial Distribution Systems. Introduction of shunt capacitors may further increase the harmonics, if not placed at optimal locations. This paper aims to identify optimal placement...
Power quality problems in the power distribution system are not new, but the customer awareness regarding these problems has increased nowadays. Recent development of Flexible Alternating Current Transmission System (FACTS) devices offers reliable solution to power quality problems. This work proposes a solution that implements custom power devices such as Static Synchronous Compensator (STATCOM)...
The latest buzzword, in energy conscious industries, is the improvement of power quality. Good quality of electric power can not only result in handsome savings in power bills but also helps in avoiding unwarranted breakdowns. This paper aims at analyzing the reasons for poor quality of power and solutions for improving it. The change in magnitude and power factor can be corrected without much of...
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