period pulse width and frequency measurements

... voltages and damage harmonic power quality As an example, a network as that in Fig 4 was constructed in the laboratory and its (UB = 100 V and SB = 500 VA) and considering two cases (dC = 1 and 0.5): ... device and series device, and mainly discussed a scheme and control of UPQC with current-injection shunt APF which can protect load from almost all supply problems of voltage quality and eliminate ... substation, namely X1, apr = 2.323 pu and X2, apr = 2.323 pu and X1 = 2.234 pu and X2 = 2.503 pu The former was calculated by neglecting the inductor resistance (1) and the latter was calculated by

Ngày tải lên: 19/06/2014, 08:20

... 1 and the maximum traction load (i.e., S L = 75 MVA), the ratio r L = R L /X S = λL ·S S /S L is 145.08 and 9.92 and the resonance is located at harmonics k r, a = 21.6 and 6.0 on the French and ... Trang 2corresponding to the above data are r L = 27.4, λL = 1 and 0.95 (Cases 1 and 2, respectively) and τ1 = 0 6.1.2 Experimental measurements of the series resonance The harmonic response of ... rectifier and the large input capacitor make the current have narrow high peaks at short intervals and almost zero value elsewhere Fig 3 shows the output voltage and current of the circuit in Fig 2 Frequency

Ngày tải lên: 19/06/2014, 08:20

... neighbour’s facility and vice versa Electric utilities have recognized this problem and are adopting standards, like the Institute of Electrical and Electronics Engineers (IEEE) Standard 519 which ... This standard is designed to protect both businesses and utilities, many other standards are also available and set limits for such harmonic penetration Harmonic analysis, load flow analysis, and ... should the system parameters change and cause the tuning frequency to shift slightly higher [6, 7] Once the filter type and the components (reactors, capacitors and resistors) are determined, the

Ngày tải lên: 19/06/2014, 08:20

... utility [8] Harmonic measurements and analysis have been conducted and are becoming an important component of the plant routine measurements and for power system planning and design Metal plant ... are to expand because of the high and rapid demand on steel, aluminum, etc… to coup up with the higher rates of development As for the plant and due to presence of three arc furnaces and two ladle ... voltages and TRMS AC line currents; peak voltage and current; active, reactive and apparent power per phase; harmonics for voltages and currents up to the 50th order (CA8334, technical handbook,

Ngày tải lên: 19/06/2014, 08:20

... module and ground and represents the parameter under study Parameter Cc represents the capacitive coupling between cables and ground and Rc and Lc are the resistance and inductance of ... Asymmetrical and Nonsinusoidal Conditions, IEEE 260 Power Quality Harmonics Analysis and Real Measurements Data Transactions on Power Delivery, Vol 23, Issue 2, (april... elements and ... and i2(t) are the current of mesh 1 and mesh 2, respectively, vin(t) is the injected voltage by the converter, v2(t) the voltage at node 2 and vpv(t) is the voltage between PV module and

Ngày tải lên: 19/06/2014, 08:20

... pulse trials were injected before and after PRBS trials and the responses were com-pared Torque and EMGs were recorded and ensemble-averaged Changes in reflex torque of more than 20% before and ... intrinsic and reflex stiffness gains and Ashworth scores in the spas-tic, paretic elbow and ankles N N 1 1 ˆ TQ Trang 5Joint reflex torque and Ashworth Figure 3 shows a typical position pulse trial ... stretch reflex response and to measure reflex torque magnitude, a series of 10 pulses was applied to the elbow/ankle joint with displacement amplitude of 5 deg and width of 40 ms Pulses were applied

Ngày tải lên: 19/06/2014, 08:20

... introduced by Rosenberg and colleagues [3] and applied by Farmer and colleagues [4] who used coherence analysis to identify both a significant low frequency and beta-band association between ... peak value and its frequency or the frequency range of significant coherence In Figure 1 there is significant coherence between 0.5 and 3.5 Hz and the peak value of coherence is 0.46 and occurs ... (t) and y2 (t) result from passing the signals x1 (t) and x2 (t) respectively through a tunable narrowband bandpass filter with transfer function denoted by H (f): where and ∆ are the center frequency

Ngày tải lên: 19/06/2014, 10:20

... without and with the OPD The jet velocity V and radiation parameters were varied For V= 50, 100, and 300 m s -1, the propulsion produced by the jet was Fj = 6, 28, and 200 g, respectively, and the ... The jet velocity without the ODP was V=300 and 400 ms-1, Fj= 80 and 140 g The OPD was produced by repetitively pulsed radiation with f= 50 and 100 kHz and the average power W≈1200 W (the absorbed ... ejection The OPD was produced by radiation pulse trains, and in some cases – by repetitively pulsed radiation The structure and repetition rate of pulse trains was selected to provide the replacement

Ngày tải lên: 21/06/2014, 02:20

... diameter of the laser beam, pulse duration and other parameters of the laser system But when using dimensionless variables and parameters the results can be compared and the conclusion is that ... coating and granite substrate at rectangular laser pulse duration τs=0.15(Yevtushenko et al., 2007) Trang 5The Effect of the Time Structure of Laser Pulse on Temperature Distribution and Thermal ... 2002) in contrary to thus far frequency-domain measurements of transition linewidths (Becker & Shirley, 1996), spectroscopy of bound electron dynamics in atoms and molecules (Hentschel et al.,

Ngày tải lên: 21/06/2014, 02:20

... mode locked envelope and the pulse train The possibility exists that the spontaneous emissions accidentally gets in phase and opens up the stuarable absorber gate and a pulse starts to reverberate ... mode width and high coherence time), should show spontaneous break up into random pulsations, which is not observed in reality Trang 11Various Ambiguities in Generating and Reconstructing Laser Pulse ... (1/200GHz), which is less than half the Q-switched pulse width So, the Q-switch pulse width had time to carry out a couple of reverberations and establish cavity longitudinal modes through stimulated

Ngày tải lên: 21/06/2014, 02:20

... marking parameters such as the pulse repetition frequency, laser pumping current, pulse duration and focal distance The laser setting was tuned according screen-to the trace width (microfabrication ... DPMAX and the maximum bandwidth of the voltage responsivity BWMAX This choice of the sensor design parameters (dimensions, substrate, bonding) is an example of good compromise among cost, bandwidth, ... equalization filter of the amplitude of the frequency response in order to achieve a flat bandwidth (±1dB) between 10Hz and 18 kHz In this way the laser pulse shape was reproduced with high fidelity,

Ngày tải lên: 21/06/2014, 02:20

... (means charge- and current-free) medium, Maxwell’s equations in Gaussian units are: 10 B E D H where E and H are electric and magnetic fields In addition, D and B are electric and magnetic flux ... Detection and Timing: Experiments and Techniques, In: Adv Electron El Phys., L Marton and Claire Marton (Ed.), Vol 31, page numbers (39–117), Elsevier, ISBN: 9780120145317, Netherlands Poultney, ... we have measured the lock-in output with the lock-in integrated time 100 ms, and the equivalent noise bandwidth for bandpass filter Δf =1 Hz It is interesting to note that the lock-in output increase

Ngày tải lên: 21/06/2014, 02:20

... Equation (9) contains a carrying envelope with wave number k0and frequencyω0and spatial and temporal information contained in f(r, z)and g(t)respectively The following gaussianexpressions (10) ... wave andits direction alternates every half period of the oscillation Acceleration mechanisms presentedhere require an intermediary : the plasma wave This one is excited by the laser pulse andallows ... systems, also based on chirped pulse amplification, Strickland &Mourou (1985) and using here Titanium Sapphire crystals, fit in a room of several tens ofmeters square and deliver on-target energy

Ngày tải lên: 21/06/2014, 02:20

... are dominant in iP and iN In other words, the ripple currents can be reduced by increasing the carrier frequency and the buffer inductance value Carefully looking into v∗ and iP in Fig reveals ... commands of chopper-cells and 2, v∗ and v∗ as follows: v∗ = v∗ − v∗ E + , (17) where a reasonable approximation of v∗ = v∗ = v∗ was A B1 B2 made Equation (17) implies that chopper-cells and were ... 70 V, and the ∗ dc voltage command of each chopper-cell was vC = 70 V The ac voltage command of the load was given by: √ v∗ = 2V0 sin 2π f t V0 = 25 V f = 50 Hz (20) The circuit parameters and...

Ngày tải lên: 15/10/2013, 16:24

... fluxes ψg and ψc φ Power factor angle xxvi List of Abbreviations DSP Digital Signal Processor PWM Pulse Width Modulation SPWM Sin Triangle Pulse Width Modulation SVPWM Space Vector Pulse Width Modulation ... =0.87 (a1 ) VU V and IW for NV scheme (a2 ) npf and FFT for NV scheme (b1 ) VU V and IW for SV scheme (b2 ) npf and FFT for SV scheme (c1 ) VU V and IW for NV + SV scheme (c2 ) npf and FFT for NV ... =0.93 (a1 ) VU V and IW for NV scheme (a2 ) npf and FFT for NV scheme (b1 ) VU V and IW for SV scheme (b2 ) npf and FFT for SV scheme (c1 ) VU V and IW for NV + SV scheme (c2 ) npf and FFT for NV...

Ngày tải lên: 14/09/2015, 08:37

... any jokes, as I'm really bad at telling jokes So I'll no more than wish Jim and Sandra luck and hope they have a long and happy life together Business conversation Paula: David: David, I wonder ... drove at breakneck speed along the m o t o r w a y and was soon stopped by the police (carelessly fast and dangerous] Slow m o v e m e n t and stopping It was fascinating to see the winning goal ... the traffic slowed to a crawl and then finally came to a standstill He always does everything in an unhurried manner, (slow; implies slight criticism] We got up late and had a leisurely breakfast,...

Ngày tải lên: 01/11/2013, 11:20

... wife and husband seem to have closer and more intimate relationship than in American one so that Vietnamese people are more comfortable criticizing their spouses Of the family members, grandparents ... have everyday contact with their grandparents, and hence they seldom criticize them In summary, the investigation in the frequency of criticizing by the Vietnamese and the American reveals the fact ... govern its occurrence and forms of expression are culture dependent The topics of criticism, frequency of criticizing and factors that affect people’s decision to criticize and their criticizing...

Ngày tải lên: 28/03/2014, 11:20

... breakpoints in the Chinese and Thai viruses were located in AV1, AV2, AC1 and AC4, whereas ORFs AV1 and AV2 were identified to be cold spots in the Bangladeshi viruses The frequency and locations of recombination ... recombinant forms, recombination hot spots and frequency of recombination documented in this study would provide new information for understanding the diversity and evolution of tomato-infecting begomoviruses ... Tomato yellow leaf curl Thailand virus-[1] Tomato yellow leaf curl Thailand virus-[2] Tomato yellow leaf curl Thailand virus-[Myanmar] Tomato yellow leaf curl Thailand virus-[Y72] Z48182 AF165098...

Ngày tải lên: 18/06/2014, 18:20

... Harmonics Analysis and Real Measurements Data Crectifier and Cac_cable are the capacitive couplings of the rectifier side and underground cable, respectively, with ground Rac_cable and Lac_cable make ... compatibility (EMC) Part 4-7: Testing and measurement techniques General guide on harmonics and interharmonics measurements and instrumentation for power supply and equipment connected thereto, International ... (a) current waveform and (b) FFT analysis of the waveform obtained, at node - - Adjustment of the firing pulses frequencies and control strategies to reduce or avoid resonance and capacitive currents...

Ngày tải lên: 18/06/2014, 22:20

... Spain XI Part Measurements Electric Power Systems Harmonics Identification and Measurements Soliman Abdelhady Soliman1 and Ahmad Mohammad Alkandari2 1Misr University for Science and Technology, ... fundamental frequency component and harmonic components with order of integral multiples of the fundamental frequency It is also assumed that the frequency is known and constant during the estimation period ... Quality Harmonics Analysis and Real Measurements Data Sources and problems of harmonics [2] Harmonic sources are divided into two categories: Established and known New and Future A review of the...

Ngày tải lên: 19/06/2014, 08:20