Reactive power calculation of power cable under complex operation environment based on poynting vector

2015 ◽  
Vol 49 (3) ◽  
pp. 375-385 ◽  
Author(s):  
Fan Yang ◽  
Bing Gao ◽  
Minuyou Chen ◽  
Lin Wei ◽  
Qingjun Peng ◽  
...  
Keyword(s):  
Poynting Vector ◽  
Reactive Power ◽  
Power Calculation ◽  
Power Cable ◽  
Complex Operation ◽  
Operation Environment

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.

A method to calculate the reactive power of iced transmission line based on Poynting vector and FDFD

2016 ◽  
Vol 50 (3) ◽  
pp. 417-433 ◽  
Author(s):  
Peng Cheng ◽  
Fan Yang ◽  
Hanwu Luo ◽  
Haibo Guo ◽  
Wei Ran ◽  
...  
Keyword(s):  
Transmission Line ◽  
Poynting Vector ◽  
Reactive Power

Analytical Study of the Effects of Grid Resistance on Grid-Connected PV Systems: Modeling and Simulation

2016 ◽  
Author(s):  
S. F. Al-Gahtani ◽  
R. M. Nelms
Keyword(s):  
Renewable Energy ◽  
Power Systems ◽  
Reactive Power ◽  
Energy System ◽  
Power Calculation ◽  
Pv System ◽  
Pv Systems ◽  
R Ratio ◽  
Grid Impedance ◽  
Utility Network

Renewable energy systems have become common in power systems. Many problems associated with connecting a renewable energy system to utility network have arisen. In the traditional power calculation, the resistance of the line is ignored because of large the X/R ratio. However, the R/X ratio in the distribution network is greater than in transmission. Because of that, the line resistance should be considered in the power calculations. In this paper, the effect of the grid resistance on transfer of power is investigated by calculating the active power between a PV system and the grid where the grid resistance is included. Two models were developed to study the effects of the grid resistance. The sensitivity of real and reactive power to the grid impedance, the current performance and the phase angle for the maximum power were studied under variations of the grid resistance. The results from both models have been compared to emphasize that the transfer of power is really influenced by the resistance of the line impedance.

Fuzzy MRAS rotor resistance identification of bearingless induction motor based on reactive power

2020 ◽  
pp. 1-20
Author(s):  
Wenshao Bu ◽  
Fei Zhang ◽  
Youpeng Chen ◽  
Xiaofeng Zhang
Keyword(s):  
Control System ◽  
Induction Motor ◽  
Reactive Power ◽  
Decoupling Control ◽  
Power Calculation ◽  
Control Performance ◽  
Resistance Parameter ◽  
Identification Method ◽  
Rotor Resistance ◽  
On Line

As for the inverse decoupling control system of a bearingless induction motor (BL-IM), in order to eliminate the influence of rotor resistance variation on its control performance, on the basis of the reactive power calculation of torque system, a novel fuzzy model reference adaptive (MRAS) identification method of rotor resistance is proposed. The reference model and adjustable model of instantaneous reactive power are derived in detail. In order to improve the identification performance of rotor resistance, a fuzzy PI adaptive law based on popov super stability theory is constructed. On this basis, a rotor resistance identifier is constructed, and it is used to on-line correct the rotor resistance parameter in the inverse system mathematical model of a BL-IM system. Based on the inverse decoupling control system of a BL-IM, the simulation experimental analysis and verification are carried out. The simulation experimental results have shown that when the proposed identification method of rotor resistance is used, not only the identification- and tracking-speed of rotor resistance can be effectively improved, but also the identification accuracy of rotor resistance can be improved; as for the BL-IM system, after the rotor resistance parameter is on-line corrected, not only the inverse dynamic decoupling control performance can be effectively improved, but also the robustness of BL-IM system to the variation of rotor resistance parameters can be improved.

scholarly journals Improved PR Control Strategy for an LCL Three-Phase Grid-Connected Inverter Based on Active Damping

2021 ◽  
Vol 11 (7) ◽  
pp. 3170
Author(s):  
Yahui Li ◽  
Jing Zhang ◽  
Zhenghang Hao ◽  
Peng Tian
Keyword(s):  
Coordinate System ◽  
Control Strategy ◽  
Reactive Power ◽  
Current Control ◽  
Active Damping ◽  
Power Calculation ◽  
Frequency Method ◽  
Proportional Integral ◽  
Three Phase ◽  
Grid Connected Inverter

Aiming at the problem of power coupling and complicated decoupling in the d-q coordinate system of a three-phase grid-connected inverter, a current closed-loop control strategy based on an improved QPIR (quasi-proportional integral resonant) controller in the α-β two-phase static coordinate system is proposed. Firstly, the mathematical model of an LCL three-phase grid-connected inverter is established, and its instantaneous power calculation equation is deduced. Secondly, the frequency method is applied to compare and analyze the proportional resonant, quasi-proportional resonant, and improved current controller, and the appropriate improved controller parameters are obtained according to the traditional proportional integral controller parameter design method and the weight coefficient. Finally, the improved controller is compared with the traditional controller in the simulation model of the LCL three-phase grid-connected inverter based on active damping. The results show that the proposed improved current control strategy has good dynamic response characteristics, can realize the non-static error control of grid-connected current, and realizes the decoupling control of active power and reactive power when the load jumps. At the same time, the results also prove the superiority of the proposed control strategy and verify its effectiveness.

scholarly journals Comparison and analysis of several instantaneous reactive power calculation methods

2021 ◽  
Vol 2083 (4) ◽  
pp. 042050
Author(s):  
YiWen Hu
Keyword(s):  
Calculation Method ◽  
Random Number ◽  
Reactive Power ◽  
Random Numbers ◽  
Power Calculation ◽  
Calculation Methods ◽  
Instantaneous Reactive Power ◽  
Multiple Groups ◽  
Comparison And Analysis ◽  
Sine Signal

Abstract Briefly describes several more common algorithm of reactive power when the input signal is a sine signal and research all kinds of reactive power calculation method, through matlab using the theory of monte carlo random multiple sets of random number them as the amplitude and phase Angle of voltage, current, the different calculation method of the size of the instantaneous reactive power, To get the best calculation method. Multiple groups of random numbers can avoid the error caused by using only one set of data for testing in existing papers.

New reactive power calculation method for electric arc furnaces

Measurement ◽  
2016 ◽  
Vol 81 ◽  
pp. 251-263 ◽  
Author(s):  
Haidar Samet ◽  
Iman Masoudipour ◽  
Mostafa Parniani
Keyword(s):  
Calculation Method ◽  
Reactive Power ◽  
Electric Arc ◽  
Power Calculation ◽  
Electric Arc Furnaces ◽  
Arc Furnaces
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