A System with Dynamic Reactive Power Compensating for High Power Windings Rotor Induction Motor

2010 ◽  
Vol 139-141 ◽  
pp. 1601-1604
Author(s):  
Hui Rong Xiao ◽  
Chen Min ◽  
Jun Zhang ◽  
Yong Jun Xiong
Keyword(s):  
Induction Motor ◽  
Power Factor ◽  
Single Phase ◽  
Reactive Power ◽  
Voltage Source ◽  
Stator Current ◽  
Capacitive Voltage ◽  
In Series ◽  
Motor Load ◽  
Set Up

This paper presents how a capacitive voltage source is connected in series to the rotor of induction motor to improve power factor, reduce stator current, and improve efficiency and ability of overloading. The principle of the reactive power compensating device for windings rotor induction motor is described and mathematical model in dq0 reference frame is set up. A single phase to three phases AC-AC cycloconverter is adopted in order to produce capacitive voltage, which make the circuit simple and capacity of transformer much decremented. Using an 89S52 sing-chip microcomputer as the control kernel and MAX197 as A/D, the system is capable of automatic adjusting the function of power factor compensation as the change of the motor load. The system was tested on a JR138-8 motor. The result shows that the power factor is over 0.96 and the current of the stator reduces over 15%.

scholarly journals Review Scope on Design & Operation of Automatic Power Factor Controller Circuit with Artificial Intelligence using Fuzzy Logic

2021 ◽  
Vol 9 (VII) ◽  
pp. 3248-3256
Author(s):  
Sandeep Bishla
Keyword(s):  
Artificial Intelligence ◽  
Fuzzy Logic ◽  
Induction Motor ◽  
Power Factor ◽  
Single Phase ◽  
Reactive Power ◽  
Sleep Mode ◽  
Capacitor Banks ◽  
K Factor ◽  
Selection Of

This paper shows the scope of making an automatic Power Factor controller with the help of Fuzzy Logic. A Single-phase PF circuit is taken for experimental purposes in two sets of capacitor banks. Single-phase supply connected to Induction Motor as load considering for power factor correction. Capacitor along with its circuit connected in parallel to the Induction Motor. Selection of capacitor is done based on multiplier table using K Factor along with initial Cos of the load. Incoming control from MCB and current measurement are done at incoming as well as on capacitor banks individually. Seeking best selection, represent the relation between KVAr and µF. Results show we got desired permutations & combinations of data for making the FLC rule table. By this, we also thought about the industrial application using reactive power during the jerking load and sleep mode of machines.

scholarly journals Direct control of active and reactive power for a grid-connected single-phase photovoltaic inverter

2021 ◽  
Vol 12 (1) ◽  
pp. 139
Author(s):  
Eyad Radwan ◽  
Mutasim Nour ◽  
Ali Baniyounes ◽  
Khalid S. Al Olimat ◽  
Emad Awada
Keyword(s):  
Power Factor ◽  
Power Flow ◽  
Single Phase ◽  
Reactive Power ◽  
Voltage Source ◽  
Direct Control ◽  
Utilization Factor ◽  
Pv Inverter ◽  
Active And Reactive Power ◽  
Wide Range

This paper presents a single-phase grid-connected photovoltaic system with direct control of active and reactive power through a power management system of a Photovoltaic inverter. The proposed control algorithm is designed to allow maximum utilization of the inverter’s available KVA capacity while maintaining grid power factor and current total harmonic distortion (THD) requirements within the grid standards. To reduce the complexity and improve the efficiency of the system, two independent PI controllers are implemented to control single-phase unipolar PWM voltage source inverter. One controller is used to control the power angle, and hence the active power flow, while the other controller is used to control the reactive power, and consequently the power factor by adjusting the voltage modulation index of the inverter. The proposed system is modelled and simulated using MATLAB/Simulink. The PV inverter has been examined while being simultaneously connected to grid and local load. Results obtained showed the ability of the PV inverter to manage the active and reactive power flow at, and below rated levels of solar irradiances; resulting in an increased inverter utilization factor, and enhanced power quality. The proposed system, was capable of operating at power factors in the range of 0.9 lead or lag for reactive power compensation purposes and delivered its power at a wide range of solar irradiance variations.

scholarly journals Hybrid Reference Current Generation Theory for Solar Fed UPFC System

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1527
Author(s):  
R. Senthil Kumar ◽  
K. Mohana Sundaram ◽  
K. S. Tamilselvan
Keyword(s):  
Neural Network ◽  
Power Factor ◽  
Reactive Power ◽  
Voltage Source ◽  
Unity Power Factor ◽  
Current Generation ◽  
Load Voltage ◽  
Reference Current Generation ◽  
Source Current

The extensive usage of power electronic components creates harmonics in the voltage and current, because of which, the quality of delivered power gets affected. Therefore, it is essential to improve the quality of power, as we reveal in this paper. The problems of load voltage, source current, and power factors are mitigated by utilizing the unified power flow controller (UPFC), in which a combination of series and shunt converters are combined through a DC-link capacitor. To retain the link voltage and to maximize the delivered power, a PV module is introduced with a high gain converter, named the switched clamped diode boost (SCDB) converter, in which the grey wolf optimization (GWO) algorithm is instigated for tracking the maximum power. To retain the link-voltage of the capacitor, the artificial neural network (ANN) is implemented. A proper control of UPFC is highly essential, which is achieved by the reference current generation with the aid of a hybrid algorithm. A genetic algorithm, hybridized with the radial basis function neural network (RBFNN), is utilized for the generation of a switching sequence, and the generated pulse has been given to both the series and shunt converters through the PWM generator. Thus, the source current and load voltage harmonics are mitigated with reactive power compensation, which results in attaining a unity power factor. The projected methodology is simulated by MATLAB and it is perceived that the total harmonic distortion (THD) of 0.84% is attained, with almost a unity power factor, and this is validated with FPGA Spartan 6E hardware.

scholarly journals Windings Design for Single-phase Induction Motors Base on 4-phase Induction Motor (Case study: identical windings design)

2018 ◽  
Vol 215 ◽  
pp. 01023 ◽  
Author(s):  
Zuriman Anthony ◽  
Erhaneli Erhaneli ◽  
Zulkarnaini Zulkarnaini
Keyword(s):  
Induction Motor ◽  
Power Factor ◽  
Single Phase ◽  
Induction Motors ◽  
Three Phase ◽  
Motor Design

A 1-phase induction motor usually has a complicated windings design which compares to polyphase induction motor. In addition, a large capacitor start is required to operate the motor. It is an expensive way to operate the motor if it compare to polyphase induction motor. So, a new innovation method is required to make the motor more simple and cheaper. This research is purposed to study a new winding design for a single-phase capacitor motor. Winding design of the motor was conducted to a simple winding design like a 4-phase induction motor that has four identical windings. The comparator motor that use in this study was a Three-phase induction motor with data 1400 RPM, 1.5 HP, 50Hz, 380/220V, Y/Δ, 2.74/4.7A, 4 poles, that had the same current rating which the proposed method. The result showed that the motor design on this proposed method could be operated at 88.18 % power rating with power factor close to unity.

scholarly journals HIL-Assessed Fast and Accurate Single-Phase Power Calculation Algorithm for Voltage Source Inverters Supplying to High Total Demand Distortion Nonlinear Loads

Electronics ◽  
2020 ◽  
Vol 9 (10) ◽  
pp. 1643
Author(s):  
Jorge El Mariachet ◽  
Yajuan Guan ◽  
Jose Matas ◽  
Helena Martín ◽  
Mingshen Li ◽  
...  
Keyword(s):  
Steady State ◽  
Single Phase ◽  
Reactive Power ◽  
Dynamic Performance ◽  
Active Power ◽  
Voltage Source ◽  
Power Calculation ◽  
Calculation Algorithm ◽  
Nonlinear Loads ◽  
Voltage Source Inverters

The dynamic performance of the local control of single-phase voltage source inverters (VSIs) can be degraded when supplying to nonlinear loads (NLLs) in microgrids. When this control is based on the droop principles, a proper calculation of the active and reactive averaged powers (P–Q) is essential for a proficient dynamic response against abrupt NLL changes. In this work, a VSI supplying to an NLL was studied, focusing the attention on the P–Q calculation stage. This stage first generated the direct and in-quadrature signals from the measured load current through a second-order generalized integrator (SOGI). Then, the instantaneous power quantities were obtained by multiplying each filtered current by the output voltage, and filtered later by utilizing a SOGI to acquire the averaged P–Q parameters. The proposed algorithm was compared with previous proposals, while keeping the active power steady-state ripple constant, which resulted in a faster calculation of the averaged active power. In this case, the steady-state averaged reactive power presented less ripple than the best proposal to which it was compared. When reducing the velocity of the proposed algorithm for the active power, it also showed a reduction in its steady-state ripple. Simulations, hardware-in-the-loop, and experimental tests were carried out to verify the effectiveness of the proposal.

Experimental Analysis on the Operating Performance of Induction Motor with Unbalance Power Supply Conditions

2014 ◽  
Vol 635-637 ◽  
pp. 1404-1407
Author(s):  
Yuan Xing Zhang ◽  
Fei Li ◽  
Ya Li Shen ◽  
Lei Juan Yang ◽  
Jie Li ◽  
...  
Keyword(s):  
Induction Motor ◽  
Power Supply ◽  
Power Efficiency ◽  
Single Phase ◽  
Reactive Power ◽  
Phase Voltage ◽  
Three Phase ◽  
Unbalanced Voltage ◽  
Negative Sequence Current ◽  
Domestic Appliances

Problems of power quality have been increasingly concerned by the researchers, as the domestic appliances we are usually used are single-phase load, which mainly causes the unbalance of three-phase voltage of power supply. If the induction motor is supplied by three-phase unbalanced voltage, the currents, active and reactive power, efficiency, and losses are affected as the negative-sequence current appears, this paper is emphasized on the induction motor’s characteristics when its’ power supply is three-phase unbalanced voltage by experimental research.

scholarly journals A Three-Level Inverter Based Static Compensator (STATCOM)

2018 ◽  
Vol 2 (5) ◽  
Author(s):  
Aniagboso John Onah
Keyword(s):  
Power Factor ◽  
Reactive Power ◽  
Voltage Regulation ◽  
Electric Utility ◽  
Transmission System ◽  
Voltage Source ◽  
Voltage Source Inverter ◽  
Distribution Lines ◽  
Static Compensator ◽  
Transmission And Distribution

In an electric utility network, the occurrence of voltage depression on transmission and distribution lines is due to the flow of reactive power. It is desirable to regulate the voltage within a narrow range of its nominal value (±5% range around their nominal values). Thus, reactive power control is necessary so as to control dynamic voltage swings under various system conditions and thereby improve the power system transmission and distribution performance. A fast acting Static Compensator (STATCOM) is required to produce or absorb reactive power so as to provide the necessary reactive power balance in transmission and distribution system. Modern reactive power compensation employs voltage source inverter (VSI). In this paper, a static compensator based on three-phase, three-level voltage source inverter (VSI) was investigated. The paper is intended to show how this STATCOM can be used to improve the ac system power factor and voltage regulation, and hence improve the performance of the transmission and distribution lines. Application of this STATCOM to a transmission system achieved unity power factor, thereby reducing the active power loss by 38.7% and consequently decreasing power costs, as well as increasing transmission system capacity. The presence of the STATCOM also reduced the reactive power flowing on the line from 2.79 MVAr to 1745VAr – resulting in optimum voltage regulation at the load bus. The reactive elements (L and C) are small in size.

Vector Decoupling Control Strategy for Three-Phase Voltage Source PWM Rectifier

2013 ◽  
Vol 336-338 ◽  
pp. 450-453
Author(s):  
Jian Ying Li ◽  
Wei Dong Yang ◽  
Ni Na Ma
Keyword(s):  
Power Factor ◽  
Control Strategy ◽  
Reactive Power ◽  
Decoupling Control ◽  
Voltage Source ◽  
Pwm Rectifier ◽  
Phase Voltage ◽  
Unity Power Factor ◽  
Three Phase ◽  
Rotating Coordinates

In view of the fact that active power and reactive power have coupling relation, a novel vector decoupling control strategy is presented for three-phase voltage source PWM rectifier. In the paper, the power control mathematical mode of the PWM rectifier is deduced based on the mathematical model of rectifier in synchronous d-q rotating coordinates, and a new voltage feed forward decoupling compensation control strategy is proposed. The simulation results show that the voltage and current of the three-phase PWM rectifier have better respond preference, the current aberrance is smaller and the voltage is steady under the control strategy. The PWM rectifier can implement PWM commute with unity power factor, but also feed back the energy to AC side with unity power factor.

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