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Register a new userImproving Parallel Active Filters' performance by enhancing control system's work conditions
تحسين أداء المرشحات الفعّالة التفرعية في الشبكات الكهربائية
1981
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Added by
Tishreen University ورقة بحثية
Publication date
2015
fields
Electrical Power Engineering
and research's language is
العربية
Created by
Shamra Editor
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يتم في هذا البحث دراسة تأثير تحسين شروط عمل نظام التحكم بالمرشح الفعّال على تحسين أدائه في تعويض التوافقيات و تحسين جودة الطاقة الكهربائية. حيث يتم تحويل مدخلات نظام التحكم المتغيرة إلى قيم ثابتة مع الزمن. يتم اعتماد مطالات التوافقيات العليا كقيم مرجعية (قيم مقاسة) لنظام التحكم, بحيث يقوم المرشح بالعمل على تخفيض قيمها و بالتالي تحسين قيمة عامل التشوّه التوافقي الكلي (Total Harmonic Distortion(THD.
This paper presents the effects of enhancing control systems' work conditions on active power filter performance in improving power quality. We will convert the changeable inputs of the controllers into static ones. The high harmonics' amplitude will be the set-values of the controllers, so the active filter reduces them into zero and then THD will be in its permitted limits.
References used
Rudnick,H; Dixon,J; Morán,L." Delivering Clean and Pure Power". IEEE power & energy magazine, 2003
D. kumar, P." INVESTIGATIONS ON SHUNT ACTIVE POWER FILTER FOR POWER QUALITY IMPROVEMENT". Thsis, National Institute of Technology Rourkela,2007
Patidar, R, D; Singh, S, P. "ACTIVE AND REACTIVE POWER CONTROL AND QUALITY MANAGEMENT IN DG-GRID INTERFACED SYSTEMS. ARPN". Journal of Engineering and Applied Sciences,2009
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Computer networks have evolved considerably in the past few years of big increases
in mutual amounts of data across the network hand because of the increasing number of
interconnected devices, which can exchange data as part of the network and this
is what led
to the emergence of what is known as the problems of congestion Studies showed about
some of these problems that the largest reason is involved in the implementation of the
transmission rules, and this led to the urgent of multiple types of protocols in the computer
networks that needs to deal with different computer and communication systems, and
many other applications, which often causes errors at the level of the bit and level of the
packets, missing packets, duplicate packets, randomly received packets, and most
importantly the appeared congestion in the network.
This research aims to determine how to improve the performance of the network to
get rid of the congestion by using advantages of the algorithms used to avoid congestion
that may occur in the networks that rely TCP protocol . The goals of these algorithms is to
reach stability in the network by working to achieve the principle of package saving.
Also within this scope it has been studied, and compared some of the algorithms that
used to avoid congestion in general, without relying on a specific protocol or specific
service category.
The target of this study is improving the electrical power systems performance estimation
because of its importance in complex modern networks investment that have a lot of
advanced equipments.
Having a complete representation of the electrical sy
stem makes diagnosis thing much
accurate and reliable which is used in electrical networks operation and maintenance. We
focus in this research on implying different conditions and factors which affect operation
and we use fuzzy petri nets for that purpose because of its characteristics in handling with
incomplete and uncertainty data . we make our simulation on a real diagram of a refinery
to compute its truth degree and discuss the results , we match that adding changing factors
at operation contribute in improving networks estimation accuracy and support decisionmaking
process .
This paper presents a three phase shunt Active Power Filter (APF) for power quality
improvements in terms of harmonics compensation. The compensation process is based on
measure non-liner load currents and Active Filter currents, and then extract t
he references
from measured currents. Measured currents are then transferred from abc frame to d-q
reference frame. A Synchronous Proportional Integral controller (Synchronous PI
controller) is used. The control signals then drive the Pulse Width Modulation (PWM)
routine, where its output controls the Voltage Source Inverter (VSI) switching devices. The
performance of the Active Filter and the Synchronous PI controller is validated though the
simulink results in MATLAB environment.
Nowadays, wireless networks are spreading more and more. The majority of installed networks have become wireless due to the simplicity of installation; where they do not need an infrastructure. This does not mean that the role of the wired networks i
s being eliminated. Instead, the wireless networks
are considered as a complementary of the wired networks. With all types of networks from personal and local area networks (PAN and LAN) to wide area networks (WAN) especially the Internet,
research has become oriented to focus on the quality of service (QoS) and the integration among all these networks taking into account the Internet which is considered as the backbone for each network that wants to exchange the information with any other network all over the world. In our research, we take into account the quality of service in the broadband networks such as the WiMax network (Worldwide Interoperability for Microwave Access) with IEEE 802.16e standard which covers cities and supports the mobility. This network can be used to interconnect the rural zones with the center of cities, this kind is called point-to-point, or it can be used to cover the cities and is called point-tomultipoint,
The last one is used to interconnect different wireless networks especially the local one which has infrastructure (Wi-fi: Wireless Fidelity) and networks which have many users and called
hotspots. However, the cells of Wi Max in the cities are called hotzones.
We propose a system model that performs the load balancing process between the base stations of WiMax network. This means, the proposed load balancing algorithm exchanges the terminals between the adjacent base stations in order to make the throughput in each base station equals to the throughput
in the others. This will improve the performance of the overall network and increase the available bandwidth for each terminal; in addition, this will increase the number of terminals which can be
served. On one side, these advantages return to the subscribers, they also return to the operator on the other side, not to mention the good renown that the operator will get from subscribers that will make more subscribers join to this network.
The proposed load balancing system can be centralized; implemented in a centralized server connected
to all base stations or distributed system implemented in each base station. The load balancing algorithm which consists of several steps is placed in a controller that achieves it. The load balancing process and the handover procedure have to be fast enough in order to prevent the adverse effect on
the quality of service especially for the real-time applications users.
Many researches showed the ability of advance reservation to improve the predictability of the
system; that allows it to deliver the applications required time constrains. Applications with
many tasks require the system to ensure a number of reserv
ations on many different distributed
resources, which usually carried out through multi-level negotiation adding by that additional
overhead on the application total response time. The extra overhead depends on many
parameters including system workload and contention. Workflows add more complexity due to
their tasks’ dependencies; thus, any rejection of or delay for a task reservation would increase
application complete time.
This paper suggests the use of elastic advanced reservation plans that depend on time gaps
presented in the sub-optimal schedules, in order to improve the reservation acceptance rate. It
presents an elastic co-reservation agent which provides the needed reservations using First Fit
allocation strategy.
The results show the ability of the proposed agent to always improve the acceptance rate with an
average of (22.25%). The more important came out result is the agent ability to increase the
reservation acceptance rate with the increasing of system competence, reaching (48.4%) for
simultaneous 90 users at the system.
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