فهرست عناوین اصلی در این پاورپوینت

فهرست عناوین اصلی در این پاورپوینت

● Reactive Power and Voltage Control
● Production and Absorption of Reactive Power (Q)
● Production and Absorption of Q (cont’d)
● Methods of Voltage Control
● Methods of Voltage Control (cont’d)
● Objectives of Reactive Power Compensation
● Shunt Reactors
● Shunt Capacitors
● Series Capacitors
● Relative Performance of Shunt and Series Caps
● Conclusions from Results Presented in
Fig. 11.56
● Compensation Requirements
● Synchronous Condenser
● Static VAR Compensators (SVC)
● Static Synchronous Compensator (STATCOM)
● Comparison of
STATCOM and SVC Characteristics
● Comparative Summary of Alternative Forms of Compensation
● Comparative Summary (cont’d)
● Tap-Changing Transformers
● Tap-Changing Transformers (cont’d)
● Modelling of Transformer ULTC Control Systems
● Distribution System Voltage Regulation
● Distribution System Voltage Regulation (cont’d)
● Implementation of Overall Reactive Power Control

نوع زبان: انگلیسی حجم: 7.01 مگا بایت
نوع فایل: اسلاید پاورپوینت تعداد اسلایدها: 37 صفحه
سطح مطلب: نامشخص پسوند فایل: ppt
گروه موضوعی: زمان استخراج مطلب: 2019/06/07 11:42:45

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عبارات مهم استفاده شده در این مطلب

عبارات مهم استفاده شده در این مطلب

voltage, power, control, line, load, shunt, ۱۵۳۹pk, reactive, system, capacitor, crp, q,

توجه: این مطلب در تاریخ 2019/06/07 11:42:45 به صورت خودکار از فضای وب آشکار توسط موتور جستجوی پاورپوینت جمع آوری شده است و در صورت اعلام عدم رضایت تهیه کننده ی آن، طبق قوانین سایت از روی وب گاه حذف خواهد شد. این مطلب از وب سایت زیر استخراج شده است و مسئولیت انتشار آن با منبع اصلی است.

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عبارات پرتکرار و مهم در این اسلاید عبارتند از: voltage, power, control, line, load, shunt, ۱۵۳۹pk, reactive, system, capacitor, crp, q,

مشاهده محتوای متنیِ این اسلاید ppt

مشاهده محتوای متنیِ این اسلاید ppt

۱۵۳۹pk control of reactive power and voltage copyright p. kundur this material should not be used without the author s consent ۱۵۳۹pk crp reactive power and voltage control voltage at terminals of all equipment are within acceptable limits both utility and customer equipment designed to operate at certain voltage rating prolonged operation outside allowable range could cause them damage system stability is satisfactory voltage levels and reactive power control have significant impact on stability the reactive power flow is minimized so as to reduce i ۲r and i ۲x losses to a practical minimum ensures transmission system operates efficiently control objectives contributing to efficient and reliable operation of power system ۱۵۳۹pk crp production and absorption of reactive power q synchronous generators can generate or absorb q depending on excitation capability limited by field current armature current and end region heating limits automatic voltage regulator continuously adjusts excitation to control armature voltage primary source of voltage support overhead lines at loads below natural or surge impedance load sil produce q at loads above sil absorb q underground cables have high sil due to high capacitance always loaded below sil and hence generate q cont d ۱۵۳۹pk crp production and absorption of q cont d transformers absorb q due to shunt magnetizing reactance and series leakage inductance loads a typical load bus is composed of a large number of devices composite characteristics are normally such that a load bus absorbs q industrial loads usually have shunt capacitors to improve power factor as power flow conditions vary reactive power requirements of transmission network vary since q cannot be transmitted over long distances voltage control has to be effected using special devices dispersed throughout the system ۱۵۳۹pk crp methods of voltage control control of voltage levels is accomplished by controlling the production absorption and flow of reactive power at all levels in the system generating units provide the basic means of voltage control additional means are usually required to control voltage throughout the system sources or sinks of reactive power such as shunt capacitors shunt reactors synchronous condensers and static var compensators svcs line reactance compensators such as series capacitors regulating transformers such as tap changing transformers and boosters cont d ۱۵۳۹pk crp methods of voltage control cont d shunt capacitors and reactors and series capacitors provide passive compensation are either permanently connected to the transmission and distribution system or switched contribute to voltage control by modifying the network characteristics synchronous condensers and svcs provide active compensation the reactive power absorbed supplied by them are automatically adjusted so as to maintain voltages of the buses to which they are connected together with the generating units they establish voltages at specific points in the system voltages at other locations in the system are determined by active and reactive power flows through various circuit elements including the passive compensating devices ۱۵۳۹pk crp objectives of reactive power compensation to control voltage and or improve maximum power transfer capability achieved by modifying effective line parameters characteristic impedance electrical length θ βl the voltage profile is determined by zc the maximum power that can be transmitted depends on zc as well as β ۱۵۳۹pk crp shunt reactors used to compensate the undesirable voltage effects associated with line capacitance limit voltage rise on open circuit or light load shunt compensation with reactors increases effective zc reduces the effective natural load i.e. voltage at which flat voltage profile is achieved they are connected either directly to the lines at the ends or to transformer tertiary windings conveniently switched as var requirements vary line reactors assist in limiting switching surges in very long lines at least some reactors are required to be connected to lines ۱۵۳۹pk crp shunt capacitors used in transmission systems to compensate for i ۲x losses connected either directly to h.v. bus or to tertiary winding of transformers normally distributed throughout the system so as to minimize losses and voltage drops usually switched a convenient means of controlling voltage shunt capacitor compensation of transmission lines in effect decreases zc increases θ i.e. electrical length advantages low cost and flexibility of installation and operating disadvantages q output is proportional to square of the voltage hence q output reduced at low voltages shunt capacitors are used extensively in distribution systems for power factor correction and feeder voltage control ۱۵۳۹pk crp series capacitors connected in series with the line used to reduce effective inductive reactance of line increases maximum power reduces i ۲x loss series capacitive compensation in effect reduces both characteristic impedance zc and electrical length θ reactive power produced increases with increasing power transfer self regulating typical applications improve power transfer compatibility alter load division among parallel lines voltage regulation ۱۵۳۹pk crp relative performance of shunt and series caps a power transfer as a function of transmission angle δ b midpoint voltage as a function of power transfer figure ۱۱.۵۶ performance of ۶ km line with and without passive compensation compensation chosen to keep vm at ۱. pu when p ۱.۴ po po natural load ۱۵۳۹pk crp conclusions from results presented in fig. ۱۱.۵۶ with shunt capacitor compensation chosen to keep midpoint voltage at ۱. pu when p ۱.۴ po maximum power transfer capability increased to ۱.۵۸ pu of natural power sil represents an increase of .۱۶ pu over the uncompensated case voltage regulation is poor i.e. the voltage magnitude is very sensitive to variations in power transfer with series capacitor compensation chosen to keep mid point voltage at ۱. pu when p ۱.۴ po maximum power transfer capability increased to ۲.۶۵ pu voltage regulation significantly improved ۱۵۳۹pk crp compensation requirements in all cases it is not required to satisfy both the objectives of increasing the power level at which the voltage profile is flat and decreasing electrical length θ in order to improve power transfer level short lines may require voltage support i.e. increase natural load this may be achieved by shunt capacitors provided θ does not become excessive as a result lines longer than ۵ km cannot be loaded up to natural load because of excessive …

کلمات کلیدی پرکاربرد در این اسلاید پاورپوینت: voltage, power, control, line, load, shunt, ۱۵۳۹pk, reactive, system, capacitor, crp, q,

این فایل پاورپوینت شامل 37 اسلاید و به زبان انگلیسی و حجم آن 7.01 مگا بایت است. نوع قالب فایل ppt بوده که با این لینک قابل دانلود است. این مطلب برگرفته از سایت زیر است و مسئولیت انتشار آن با منبع اصلی می باشد که در تاریخ 2019/06/07 11:42:45 استخراج شده است.

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