![IOSR Journal of VLSI and Signal Processing (IOSR-JVSP)](http://s1.studyres.com/store/data/008171067_1-770d7742b2be5709e7dfa8aa476ed37a-300x300.png)
Modeling and Control of a Variable-Speed Constant-Frequency Synchronous Generator With Brushless Exciter
... pulsewidth-modulation (PWM) converters, as shown in Fig. 1(a). The second category is a variable-speed constant-frequency generation system which uses a doubly fed induction generator and a reduced-rating power converter, as shown in Fig. 1(b). The former offers simple configurations for generators ...
... pulsewidth-modulation (PWM) converters, as shown in Fig. 1(a). The second category is a variable-speed constant-frequency generation system which uses a doubly fed induction generator and a reduced-rating power converter, as shown in Fig. 1(b). The former offers simple configurations for generators ...
Integration of Distributed Generation in Low Voltage Networks
... impulsive transients are damped quickly by resistive circuit components and are not conducted far from their source. There can be significant differences in the transient characteristic from one location within a building to another. Impulsive transients can excite power system resonance circuits an ...
... impulsive transients are damped quickly by resistive circuit components and are not conducted far from their source. There can be significant differences in the transient characteristic from one location within a building to another. Impulsive transients can excite power system resonance circuits an ...
Advanced Protection, Automation, and Control Functions
... incremental torque is negative, the fault is declared forward, and if it is positive, the fault is declared reverse. In this manner, the fault direction and faulted phase(s) are readily identified, which results in a robust and faster protective relay. With systems being pushed ever closer to their ...
... incremental torque is negative, the fault is declared forward, and if it is positive, the fault is declared reverse. In this manner, the fault direction and faulted phase(s) are readily identified, which results in a robust and faster protective relay. With systems being pushed ever closer to their ...
3 Ohm`s Law - Skills Commons
... The "symbol" given for each quantity is the standard alphabetical letter used to represent that quantity in an algebraic equation. Standardized letters like these are common in the disciplines of physics and engineering, and are internationally recognized. The "unit abbreviation" for each quantity r ...
... The "symbol" given for each quantity is the standard alphabetical letter used to represent that quantity in an algebraic equation. Standardized letters like these are common in the disciplines of physics and engineering, and are internationally recognized. The "unit abbreviation" for each quantity r ...
SAGs and SWELLs
... controllers for an assembly line. One glass plant estimates that a five-cycle interruption can cost about $200k. The cost to a major computer center of a 2-second outage was $600k. Following a voltage sag, an auto manufacturer indicated that the restarting of the assembly lines may required clearing ...
... controllers for an assembly line. One glass plant estimates that a five-cycle interruption can cost about $200k. The cost to a major computer center of a 2-second outage was $600k. Following a voltage sag, an auto manufacturer indicated that the restarting of the assembly lines may required clearing ...
An effective passive islanding detection method for PV
... frequency drift with positive feedback, and reactive power export error detection (RPEED) Chowdhury et al., 2009; Mohamad et al., 2011; Lopes and Huili, 2006. AFD method varies the output current frequency through positive feedback. This method will inject a current with slightly distorted in freque ...
... frequency drift with positive feedback, and reactive power export error detection (RPEED) Chowdhury et al., 2009; Mohamad et al., 2011; Lopes and Huili, 2006. AFD method varies the output current frequency through positive feedback. This method will inject a current with slightly distorted in freque ...
Aluminum Electrolytic Capacitors in Power Electronics
... The main determining factors in choosing between aluminum electrolytic and a film capacitors are usually the minimum capacitance and ripple current ratings you need. Compare the cost of a film capacitor to meet the minimum capacitance to the cost of electrolytics (including bus work and resistors) t ...
... The main determining factors in choosing between aluminum electrolytic and a film capacitors are usually the minimum capacitance and ripple current ratings you need. Compare the cost of a film capacitor to meet the minimum capacitance to the cost of electrolytics (including bus work and resistors) t ...
Timers
... Desired Time Range Time Ranges 0.1 seconds to 1 second 0.1 seconds to 3 seconds 0.1 seconds to 6 seconds 0.15 seconds to 18 seconds 0.1 seconds to 10 seconds 0.3 seconds to 30 seconds 0.6 seconds to 60 seconds 1.8 seconds to 180 seconds 6 seconds to 10 minutes 18 seconds to 30 minutes 36 seconds to ...
... Desired Time Range Time Ranges 0.1 seconds to 1 second 0.1 seconds to 3 seconds 0.1 seconds to 6 seconds 0.15 seconds to 18 seconds 0.1 seconds to 10 seconds 0.3 seconds to 30 seconds 0.6 seconds to 60 seconds 1.8 seconds to 180 seconds 6 seconds to 10 minutes 18 seconds to 30 minutes 36 seconds to ...
Performance Validation
... for the replacements with spares is not intended to allow some equipment to perpetually remain below a higher prevailing performance standard. When an asset owner decides equipment has reached the end of its normal design life, replacements must satisfy prevailing performance standards. Non-major re ...
... for the replacements with spares is not intended to allow some equipment to perpetually remain below a higher prevailing performance standard. When an asset owner decides equipment has reached the end of its normal design life, replacements must satisfy prevailing performance standards. Non-major re ...
S. Lim, J. Ranson, D.M. Otten and D.J. Perreault, Two-Stage Power Conversion Architecture Suitable for Wide Range Input Voltage, IEEE Transactions on Power Electronics , Vol. 30, No. 2, pp. 805-816, Feb. 2015.
... duty ratio with dead time. Table II shows the on-state switches in each state and conversion mode, and Table III presents the circuit configuration with this switch operation, where the current source iint models the time-averaged currents drawn by the high-frequency regulation stage. Additionally, o ...
... duty ratio with dead time. Table II shows the on-state switches in each state and conversion mode, and Table III presents the circuit configuration with this switch operation, where the current source iint models the time-averaged currents drawn by the high-frequency regulation stage. Additionally, o ...
design a three phase controlled rectifier for use in the laboratory
... Three phase AC to DC conversion of electric power is widely employed in adjustable speed drives (ASDs), uninterruptible power supply (UPSs), HVDC systems and utility interfaces with non-conventional energy sources such as electroplating welding units etc, battery charging for electric vehicles and p ...
... Three phase AC to DC conversion of electric power is widely employed in adjustable speed drives (ASDs), uninterruptible power supply (UPSs), HVDC systems and utility interfaces with non-conventional energy sources such as electroplating welding units etc, battery charging for electric vehicles and p ...
QPO-2 datasheet Low Voltage Output Ripple Attenuator
... The QPO-2 operates over an output voltage range of 0.3 to 5.5 Vdc and requires an external input bias voltage of 7 volts above the QPO output for proper operation. It is compatible with most switching power supplies and converters and regulates the output load by using either a converter’s remote se ...
... The QPO-2 operates over an output voltage range of 0.3 to 5.5 Vdc and requires an external input bias voltage of 7 volts above the QPO output for proper operation. It is compatible with most switching power supplies and converters and regulates the output load by using either a converter’s remote se ...
ECE 3130 * Digital Electronics and Design
... • Click “Measures…” and select “rise time” • Type in a trace name and press “Measure” • With the same trace, measure the “fall time” • Since we changed the pMOS width to obtain a symmetric VTC, the rise and fall times should be the same Allan Guan ...
... • Click “Measures…” and select “rise time” • Type in a trace name and press “Measure” • With the same trace, measure the “fall time” • Since we changed the pMOS width to obtain a symmetric VTC, the rise and fall times should be the same Allan Guan ...
Datasheet - Mouser Electronics
... IMPORTANT! To ensure safe and reliable operation, dc shunts and all associated equipment must be installed and serviced by qualified technical personnel. Never make any connections to the shunt, the load, or the ammeter with energized power sources. Contact Murata Power Solutions if you have any ques ...
... IMPORTANT! To ensure safe and reliable operation, dc shunts and all associated equipment must be installed and serviced by qualified technical personnel. Never make any connections to the shunt, the load, or the ammeter with energized power sources. Contact Murata Power Solutions if you have any ques ...
All You Need To Know About Power over Ethernet (PoE)
... Switch side - According to Ethernet standard, 1500 Vac galvanic isolation is required between the main board circuitry of the switch, including protective and frame ground, and the Media Dependent Interface (MDI), which is the RJ-45. IEEE 802.3af standard extends this requirement so the PoE unit res ...
... Switch side - According to Ethernet standard, 1500 Vac galvanic isolation is required between the main board circuitry of the switch, including protective and frame ground, and the Media Dependent Interface (MDI), which is the RJ-45. IEEE 802.3af standard extends this requirement so the PoE unit res ...
he inverter is one of the most important and most complex
... grid (if the batteries are not already charged). This also means that an inverter can be a complete emergency backup system for on-grid power needs (just add batteries). A backup battery charger doesn’t have to be built into the inverter. Separate chargers are, in some cases, superior to those built ...
... grid (if the batteries are not already charged). This also means that an inverter can be a complete emergency backup system for on-grid power needs (just add batteries). A backup battery charger doesn’t have to be built into the inverter. Separate chargers are, in some cases, superior to those built ...
OIP A 67 dBm Multistacked Junction Varactor 3
... ECENTLY, radio frequency (RF) adaptive systems have drawn a lot of attention, resulting in an intensive search for low-cost low-distortion tunable elements. Potential candidates are semiconductor diodes [1]–[4], MEMS switches/varactors [5], [6] and Barium Strontium Titanate (BST) varactors [7]. Alth ...
... ECENTLY, radio frequency (RF) adaptive systems have drawn a lot of attention, resulting in an intensive search for low-cost low-distortion tunable elements. Potential candidates are semiconductor diodes [1]–[4], MEMS switches/varactors [5], [6] and Barium Strontium Titanate (BST) varactors [7]. Alth ...
Installing Grounding Lug Kits on Cisco 4000 Series Routers
... Generation and The Network Works. No Excuses. are service marks; and BPX, Catalyst, Cisco, Cisco Systems, the Cisco Systems logo, EtherChannel, FastHub, FastPacket, ForeSight, IPX, LightStream, OptiClass, Phase/IP, StrataCom, and StrataView Plus are registered trademarks of Cisco Systems, Inc. in th ...
... Generation and The Network Works. No Excuses. are service marks; and BPX, Catalyst, Cisco, Cisco Systems, the Cisco Systems logo, EtherChannel, FastHub, FastPacket, ForeSight, IPX, LightStream, OptiClass, Phase/IP, StrataCom, and StrataView Plus are registered trademarks of Cisco Systems, Inc. in th ...
Power factor
In electrical engineering, the power factor of an AC electrical power system is defined as the ratio of the real power flowing to the load to the apparent power in the circuit, and is a dimensionless number in the closed interval of -1 to 1. A power factor of less than one means that the voltage and current waveforms are not in phase, reducing the instantaneous product of the two waveforms (V x I). Real power is the capacity of the circuit for performing work in a particular time. Apparent power is the product of the current and voltage of the circuit. Due to energy stored in the load and returned to the source, or due to a non-linear load that distorts the wave shape of the current drawn from the source, the apparent power will be greater than the real power. A negative power factor occurs when the device (which is normally the load) generates power, which then flows back towards the source, which is normally considered the generator.In an electric power system, a load with a low power factor draws more current than a load with a high power factor for the same amount of useful power transferred. The higher currents increase the energy lost in the distribution system, and require larger wires and other equipment. Because of the costs of larger equipment and wasted energy, electrical utilities will usually charge a higher cost to industrial or commercial customers where there is a low power factor.Linear loads with low power factor (such as induction motors) can be corrected with a passive network of capacitors or inductors. Non-linear loads, such as rectifiers, distort the current drawn from the system. In such cases, active or passive power factor correction may be used to counteract the distortion and raise the power factor. The devices for correction of the power factor may be at a central substation, spread out over a distribution system, or built into power-consuming equipment.