Reactive Power Control in Power System using Modified UPFC

The power system is a exceptionally nonlinear system that works in an always showing signs of change condition, loads, generator yields, topology and key working parameters changes consistently. The stability of the system depends on the nature of the disturbance as well as the initial operating condition. The power congestion known as the limitations to how much power can be transferred across a transmission interfaces and further that there is an incentive to actually desire to transfer more power. The old approach was to correct congestion lies in reinforcing the system with additional transmission capacity. Although easy to perform, this approach is complex, time consuming and costly. It is ending up noticeably progressively hard to get the licenses to building new transmission passages, or even grow existing ones. This issue can be solved by introducing Facts devices in the transmission system. Facts Devices play an imperative part in controlling the reactive and active power flow to the power network and thus both the system voltage variances and transient stability. Among Facts device Unified Power Flow Controller (UPFC) is the most versatile and complex power electronic equipment which can increase reliability and can serve as an alternative to new investments in overhead lines, which are difficult due to a lack of public support. The proposed work is based on control of reactive power in power system utilizing modified Unified Power Flow Controller (UPFC). The impact of customary UPFC and modified UPFC on the power flow of transmission lines were analyzed

Power system requirements

An overview of electrical power requirements for each mission of a baseline and alternate plan for space activities in the 1990-2035 timeframe is presented. The specific missions included low earth orbit (LEO), geosynchronous earth orbit (GEO), lunar, Mars, and asteroid related projects

Remote platform power conserving system

A system is described where an unattended receiver and transmitter equipped data collection platform is interrogated by a substantially polar orbiting satellite. The method and apparatus involve physically representing the orbit of the satellite and the spin of the planetary body with timers, and using these representations to turn on the platform's receiver only when the satellite should be in radio range of the platform, whereby battery power at the platform is conserved

Space station power system

The major requirements and guidelines that affect the space station configuration and power system are explained. The evolution of the space station power system from the NASA program development-feasibility phase through the current preliminary design phase is described. Several early station concepts are described and linked to the present concept. Trade study selections of photovoltaic system technologies are described in detail. A summary of present solar dynamic and power management and distribution systems is also given

Desain Pengendalian Power System Stabilizer dengan Pole Placement Fuzzy Logic Control

Power system stabilizer (PSS) berguna untuk meredam osilasi elektro mekanik yang menyebabkan gangguan. Beberapa metode desain pengendalian PSS telah dilakukan antara lain adaptive control dan robust control selain itu logika fuzzy juga berperan dalam meningkatkan performansi PSS. Kestabilan dan pencapaian performansi dari kontrol sistem berdasarkan model fuzzy output feedback controller dapat diperoleh dengan menggunakan teknik kestabilan dengan metode pole placement. Selanjutnya dilakukan defuzzyfikasi untuk mendapatkan performansi system. Pada paper ini akan dikaji pembentukan model fuzzy Takagi-Sugeno dengan metode pole placement dan dilakukan perbandingan performansi sistem untuk sistem tanpa kontrol, sistem dengan kontrol pole placement dan sistem kontrol fuzzy pole placement serta dikaji mana yang lebih baik. Kata kuncci : fuzzy Takagi-Sugeno, output feedback controller, PSS, pole placemen

MULTIFUNCTIONAL POWER QUALITY CORRECTION SYSTEM

Study the system of electric power quality control based on AVI with PWM in the systems of group feed of electromechanics with the direct-current unibus

Autonomous power system brassboard

The Autonomous Power System (APS) brassboard is a 20 kHz power distribution system which has been developed at NASA Lewis Research Center, Cleveland, Ohio. The brassboard exists to provide a realistic hardware platform capable of testing artificially intelligent (AI) software. The brassboard's power circuit topology is based upon a Power Distribution Control Unit (PDCU), which is a subset of an advanced development 20 kHz electrical power system (EPS) testbed, originally designed for Space Station Freedom (SSF). The APS program is designed to demonstrate the application of intelligent software as a fault detection, isolation, and recovery methodology for space power systems. This report discusses both the hardware and software elements used to construct the present configuration of the brassboard. The brassboard power components are described. These include the solid-state switches (herein referred to as switchgear), transformers, sources, and loads. Closely linked to this power portion of the brassboard is the first level of embedded control. Hardware used to implement this control and its associated software is discussed. An Ada software program, developed by Lewis Research Center's Space Station Freedom Directorate for their 20 kHz testbed, is used to control the brassboard's switchgear, as well as monitor key brassboard parameters through sensors located within these switches. The Ada code is downloaded from a PC/AT, and is resident within the 8086 microprocessor-based embedded controllers. The PC/AT is also used for smart terminal emulation, capable of controlling the switchgear as well as displaying data from them. Intelligent control is provided through use of a T1 Explorer and the Autonomous Power Expert (APEX) LISP software. Real-time load scheduling is implemented through use of a 'C' program-based scheduling engine. The methods of communication between these computers and the brassboard are explored. In order to evaluate the features of both the brassboard hardware and intelligent controlling software, fault circuits have been developed and integrated as part of the brassboard. A description of these fault circuits and their function is included. The brassboard has become an extremely useful test facility, promoting artificial intelligence (AI) applications for power distribution systems. However, there are elements of the brassboard which could be enhanced, thus improving system performance. Modifications and enhancements to improve the brassboard's operation are discussed

Overload protection system for power inverter

An overload protection system for a power inverter utilized a first circuit for monitoring current to the load from the power inverter to detect an overload and a control circuit to shut off the power inverter, when an overload condition was detected. At the same time, a monitoring current inverter was turned on to deliver current to the load at a very low power level. A second circuit monitored current to the load, from the monitoring current inverter, to hold the power inverter off through the control circuit, until the overload condition was cleared so that the control circuit may be deactivated in order for the power inverter to be restored after the monitoring current inverter is turned off completely