Quantifying the Quality of the Overall Supply Voltage

2009 ◽  
pp. 187-213
Keyword(s):  
Supply Voltage

Experimental studies of the operation dynamics of the motion neuro regulator of a nonlinear dynamic system

2021 ◽  
pp. 26-41
Author(s):  
Yu. Romasevych ◽  
◽  
V. Loveikin ◽  
A. Shevchuk ◽  
I. Bolbot ◽  
...  
Keyword(s):  
Angular Velocity ◽  
Dynamic System ◽  
Nonlinear Dynamic ◽  
Supply Voltage ◽  
Experimental Studies ◽  
Control Process ◽  
Nonlinear Dynamic System ◽  
Quality Of Control ◽  
Control Stability

In the article, experimental studies of the neurocontroller of a laboratory installation of a quadrocopter link are presented. The latter is a nonlinear dynamic system. The input vector of the neurocontroller included the angle of inclination of the rod (a beam of the quadcopter) relative to the horizon, its angular velocity, and the angular velocity of the propeller. The output signal of the neurocontroller is proportional to the supply voltage of the propeller drive. In the article, the planning of experimental studies was carried out and eight indicators were selected, according to which the quality of the control process was evaluated. In addition, a qualitative analysis of the control process of the dynamic system motion was carried out with the corresponding graphical dependencies. The data obtained showed a good quality of control at a zero setpoint angle. For other values of the setpoint (-0.52 and -1.05 rad), the neurocontroller provides the rod aboutness to the setpoint angle and the control stability. However, the quality of control is not high. The reason for this effect has been established in the work. In order to improve the quality of control, the neurocontroller was modified by including an integral component in its structure. At the same time, the steady-state control error has significantly decreased with minor changes in other estimated indicators.

scholarly journals The influence of power electronic converter passive filter parameters for flicker in LED lighting

2018 ◽  
Vol 21 ◽  
pp. 00020
Author(s):  
Dariusz Sobczynski
Keyword(s):  
Power Systems ◽  
Supply Voltage ◽  
Current Source ◽  
Luminous Flux ◽  
Light Sources ◽  
Light Emitting ◽  
Current Voltage ◽  
Passive Filters ◽  
The Stability

The light emitting diodes (LEDs) are ever more used, and their price is getting lower year on year. Although, exchanging traditional light sources for the LED lamps does not seem to be complicated, we need to remember to maintaining high–quality of light. One of the aspects we should be worry about is a light’s flickering. Due to the shape of the current–voltage characteristics of the LED diode and their dependence on temperature, the value of the luminous flux – but also the lifetime – depends to a large extent on the stability of the supply voltage. Therefore, correct power system should be a thermally stable current source. Unfortunately, the simple power systems, equipped with passive filters are often used as cheap commercial solutions. In those types of systems stability of the output voltage is heavily dependent on the load conditions. Passive filters – usually consisting of coils and capacitors – are placed in the output circuit. This paper presents research carried out to show of filter capacitance influence on flickering phenomenon, and practical light’s flickering measuring technique for the LED lamps.

scholarly journals Method of determining the signal level at the input of the optical receiver of surveillance equipment

2020 ◽  
pp. 15-21
Author(s):  
A. V. Sadchenko ◽  
O. A. Kushnirenko ◽  
A. V. Troyanskiy
Keyword(s):  
Supply Voltage ◽  
Functional Model ◽  
Information Leakage ◽  
Load Resistance ◽  
Optical Signal ◽  
Practical Implementation ◽  
Probe Signal ◽  
Detailed Model ◽  
Information Signal

The paper considers typical designs of surveillance devices for acousto-optic leakage channels. To assess the quality of the channel, it is proposed to use the criterion of the minimum permissible power of the information signal at the input. To analyze the processes that occur while the probe signal propagates to the pick-up point and back to the surveillance device, the authors propose a detailed model of the information leakage channel with the indication of the main transformations of the intercepted signal. The paper presents the main criteria for the correct reception of an optical signal and for the extraction of acoustic information from it. A number of assumptions are formulated regarding the practical implementation of the optoelectric converter of the receiving device, and a simplified equivalent functional model of the optical information transmission channel is developed. The authors also propose a method for calculating the voltage at the load of the photodiode depending on the distance to the vibrating surface, power and the coefficient of directional action of the transmitter emitter. The numerical dependences of the voltage at the load of the photodiode on the distance are obtained for specific numerical values of the load resistance, supply voltage, directional coefficient of the emitter and receiver, as well as the geometric dimensions of the information interception zone. A simplified technique is developed that allows determining the signal level at the input of the sensitive element of a photodetector under idealized conditions, if the minimum permissible optical signal power condition is met and there is no background illumination of the photodetector of the surveillance device.

scholarly journals Characteristics of electricity quality parameters in agri-food processing plants

2018 ◽  
Vol 10 ◽  
pp. 02022 ◽  
Author(s):  
Krzysztof Necka ◽  
Małgorzata Trojanowska
Keyword(s):  
Control Systems ◽  
Food Processing ◽  
Supply Voltage ◽  
Quality Parameters ◽  
Electrical Drives ◽  
Statistical Measures ◽  
Processing Plants ◽  
Normative Requirements ◽  
And Control

The paper presents the results of electricity quality measurements conducted in six agri-food processing plants equipped with receivers of different sensitivity to the quality of the supply voltage. In particular, statistical assessment has been conducted for the value of the parameters characterizing the supply voltage, describing the parameters using the basic statistical measures and comparing them with the normative requirements. The paper also presents examples of the hazards to electrical drives and control systems caused by such industrial electromagnetic interferences as voltage changes or deformations of voltage waveform.

scholarly journals Power Quality Improvement Using Unified Power Quality compensator

2021 ◽  
Vol 10 (4) ◽  
pp. 2803-2809
Keyword(s):  
Power Systems ◽  
Power Quality ◽  
Distribution System ◽  
Supply Voltage ◽  
Voltage Sag ◽  
Harmonic Currents ◽  
Power Quality Improvement ◽  
Power Quality Disturbances ◽  
Quality Of Electric Power

Power quality has become an important factor in power systems, for consumer and household appliances with proliferation of various electric/ electronic equipment and computer systems. The main causes of a poor power quality are harmonic currents, poor power factor, supply voltage variations, etc. In recent years the demand for the quality of electric power has been increased rapidly. Power quality problems have received a great attention nowadays because of their impacts on both utilities and customers. Voltage sag, swell, momentary interruption, under voltages, over voltages, noise and harmonics are the most common power quality disturbances.It proposes a new connection for a unified power quality compensator (UPQC) to improve the power quality of two feeders in a distribution system. It illustrates how UPQC can improve the power quality by mitigating all these PQ disturbances. The proposed configuration of the UPQC is developed and verified for various power quality disturbances by simulating the mode using MATLAB.

Continuous PWM Modulation Strategy for NPC/H and H Bridge Hybrid Multilevel Converter

2013 ◽  
Vol 748 ◽  
pp. 510-513
Author(s):  
Hong Zheng ◽  
Yue Lei Shi ◽  
Hang Hui Zhang
Keyword(s):  
Control Strategy ◽  
Output Voltage ◽  
Supply Voltage ◽  
Matlab Simulation ◽  
Multilevel Converter ◽  
Multilevel Converters ◽  
Voltage Variation ◽  
Slave Converter ◽  
And Control

f the ratio of NPC/H and H bridge hybrid multilevel converters DC supply voltage changed, the output voltage PWM waveform will be discontinuous. Thus an improved topology and control strategy is proposed. In new method, master converter operates at the fundamental frequency based on command voltage, slave converter adopts carrier phase shifted PWM technology (CPS-SPWM) at a higher frequency to enhance the quality of output voltage waveform. The amplitude of command voltage is higher than output voltage amplitude of the master converter at any time, to ensure that output voltage variation of both converters keeps in the same direction without any current flow backwards. Matlab simulation results demonstrate the effectiveness of the proposed control strategy and topology.

scholarly journals Adaptive hysteresis band current control of grid connected PV inverter

2021 ◽  
Vol 11 (4) ◽  
pp. 2856
Author(s):  
R. S. Ravi Sankar ◽  
A. Venkatesh ◽  
Deepika Kollipara
Keyword(s):  
Supply Voltage ◽  
Time Domain Analysis ◽  
Current Control ◽  
Switching Frequency ◽  
Pv Inverter ◽  
Machine Drive ◽  
Current Controller ◽  
Hysteresis Controller ◽  
Distribution Generation

In this paper, adaptive hysteresis band current controller is implemented to control the current injected into the grid. Initially it was implemented by B.K Bose for control of the machine drive. Now it is implemented for the grid connected PV inverter, to control the current injected into Grid. It is well suitable for the distribution generation. The adaptive hysteresis band controller changes the bandwidth based on the modulating frequency, supply voltage, input DC voltage and slope of the reference current. Consequently, the controller generates pulses to the inverter. It is advantageous over the conventional hysteresis controller, as the switching frequency is maintained almost constant. Thereby quality of grid current is also improved. It is verified in time domain analysis of simulation using MATLAB.

Harmonic Comparison of Three Phase Direct Matrix Converter for Reactive Load with Balance and Unbalance Supply Voltage

2018 ◽  
Vol 9 (1) ◽  
pp. 345
Author(s):  
Kandasamy K.V ◽  
Sarat Kumar Sahoo
Keyword(s):  
Control Method ◽  
Supply Voltage ◽  
External Disturbance ◽  
Optimization Technique ◽  
Input Voltage ◽  
Matrix Converter ◽  
Control Technique ◽  
Three Phase ◽  
The Matrix

<span lang="EN-IN">This paper presents harmonic analysis of matrix converter using different control technique for balance and Unbalance three phase input voltage of reactive load. Since Matrix converter is subject to affected either by external disturbance or by load conditions. Due to this the supply voltage becomes unbalance. This cause improper switching of matrix converter results higher harmonics. This harmonics are harmful to the quality of the output power. The switching sequence of the matrix converter is controlled by vector control method. Different control technique is proposed in this paper to get optimized result with reduced harmonic for unbalanced and balance input voltage using PID, Fractional Order PID (PI<sup>λ</sup>Dδ) controller (FOPID), Particle Swarm Optimization (PSO)FOPID. PID control technique result are compared with other optimization technique for best optimum output. The FOPID controller is used to compensates the current and also improvise the quality of energy by reducing the harmonic content. The simulations and hardware results will be presented and interpreted. The effectivess of the proposed system is proven with the results is shown in this paper which produce a better steady state lesser transient rather than the conventional PID method.</span>

PHYSICAL AND MATHEMATICAL JUSTIFICATION OF DIELECTRIC SEPARATION OF SEEDS OF SPICY-AROMATIC PLANTS

2020 ◽  
Author(s):  
Ю.К. Городецкий ◽  
Ю.Ф. Росляков ◽  
В.В. Литвяк
Keyword(s):  
Charged Particle ◽  
Supply Voltage ◽  
Film Coating ◽  
Aromatic Plants ◽  
Technological Parameters ◽  
Effective Surface ◽  
Dielectric Characteristics ◽  
Polarization Force ◽  
Mathematical Justification

Приведены результаты аналитических исследований влияния технологических параметров диэлектрического сепаратора на качество разделения семян пряно-ароматических культур семейства зонтичные (Apiaceae) для введения их в рецептуру пищевых продуктов. Установлена аналитическая зависимость силы поляризации Fп от заряда на семенах Q, диэлектрических характеристик изоляции электродов бифилярной обмотки εи, пленочного покрытия εп и семян εс, эффективной поверхности заряженной частицы – ее части, контактирующей с изоляцией электродов, Sэф на рабочем органе диэлектрического лабораторного сепаратора для укропа, тмина и кориандра при напряжении и частоте питающей сети 230/50 В/Гц, потребляемой мощности (0,7 ± 0,2) кВт и напряжении на бифилярной обмотке 0,9–1,5 кВ. Показано, что поляризационная сила пропорциональна либо квадрату заряда, получаемого семенем, либо квадрату питающего напряжения. Электроды, образующие бифилярную обмотку рабочего органа, должны быть уложены плотно рядом один с другим с целью минимизации угла α, возникающего между проекциями действующих сил. The results of analytical studies of the influence of the technological parameters of the dielectric separator on the quality of the separation of seeds of spicy-aromatic crops of the Umbrella family (Apiaceae) for their introduction into food formulations are presented. An analytical dependence of the polarization force Fp on the charge on the seeds Q, on the dielectric characteristics of the insulation of the electrodes of the bifilar winding εи, the film coating εп and seeds εс, on the effective surface of the charged particle (its part) in contact with the insulation of the electrodes, Sef on the working body of the dielectric laboratory separator, is established for dill, caraway and coriander with a voltage and frequency of the mains 230/50 V/Hz; power consumption (0,7 ± 0,2) kW and voltage at the bifilar winding 0,9–1,5 kV. It was shown that the polarization force is proportional to either the square of the charge received by the seed or the square of the supply voltage. The electrodes forming the bifilar winding of the working body should be laid tightly next to each other in order to minimize the angle α arising between the projections of the acting forces.

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