Comparative Study and Analysis of the Capacity of TCR Type SVC and Chain SVG to Suppress Transient Voltage Drop

2014 ◽  
Vol 651-653 ◽  
pp. 1033-1036
Author(s):  
Hui Hao ◽  
Jin Ning Shan ◽  
Qing Ye ◽  
Xin Liang Bu ◽  
Meng Nan Wang ◽  
...  
Keyword(s):  
High Speed ◽  
Reactive Power ◽  
Electronic Device ◽  
Voltage Drop ◽  
Response Speed ◽  
Power Electronic ◽  
Instantaneous Reactive Power Theory ◽  
Transformation Ratio ◽  
Transient Voltage ◽  
Short Time

Traditional voltage regulating means, for example, change the transformation ratio of on-load tap-changing transformer, switch on/off parallel compensation capacitor etc, could not solve transient voltage drop effectively due to slow response speed and inaccurate control. SVC and SVG adopt power electronic device that may be turned on/off at high speed and instantaneous reactive power theory, could output huge reactive power within very short time smoothly, so they are capable to suppress transient voltage drop.This paper analyzes the principles of SVC and SVG to suppress transient voltage drop theoretically, studies their characteristics in this respect through simulation, puts forward precautions for both devices to further suppress transient voltage drop according to the simulation result.

A Novel Harmonic Detection Method Based on Wavelet Analysis

2014 ◽  
Vol 945-949 ◽  
pp. 2057-2061
Author(s):  
Lei Wu ◽  
Ya Zhou Gao
Keyword(s):  
Wavelet Analysis ◽  
Lower Cost ◽  
Reactive Power ◽  
Electronic Device ◽  
Power Electronic ◽  
Harmonic Suppression ◽  
Harmonic Detection ◽  
Power Filter ◽  
Low Pass ◽  
Low Pass Filters

Active power filter (APF) is a new power electronic device used for reactive power compensation and dynamic harmonic suppression. Its performance depends on the highly precise detection of harmonic and reactive current. In view of the low pass filters defection in traditional ip-iq method, this paper proposes a wavelet filter based on wavelet analysis. This algorithm could attain higher detection precision with lower cost. The simulate results illustrate the efficiency and accuracy of it.

Study on Current Detecting and Control Method for STATCOM across Transformer

2011 ◽  
Vol 130-134 ◽  
pp. 1933-1937
Author(s):  
Cun Ping Wang ◽  
Xiang Gen Yin ◽  
Jian Liu ◽  
Qing Xiong
Keyword(s):  
Reactive Power ◽  
Control Method ◽  
Electronic Device ◽  
Control Strategies ◽  
Power Electronic ◽  
Output Current ◽  
Load Current ◽  
Decoupling Method ◽  
Reactive Current ◽  
And Control

Static var compensator (STATCOM) is a widely used power electronic device for dynamic reactive power compensation, and its current detecting and control method generally adopts d-q decoupling method based on the synchronous rotating coordinate transformation. However, in the traditional method, the load reactive current component is directly used as the command of STATCOM output current, so it is required that the installation position of STATCOM must be consistent with load current detecting point. But in practice, STATCOM installation point and load current detecting point may be located at two different sides of the transformer. For this situation, this paper proposed an improved reactive current detecting and control method based on the principle of power balance, achieving the current detecting and control strategies when the two points are located at different sides of transformer. Finally, the simulation of system with STATCOM accessed from the third winding of transformer verifies the correctness and feasibility of the proposed method.

scholarly journals Control the Voltage Instabilities of Distribution Lines using Capacitive Reactive Power

Energies ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 875 ◽  
Author(s):  
Shailendra Rajput ◽  
Ido Amiel ◽  
Moshe Sitbon ◽  
Ilan Aharon ◽  
Moshe Averbukh
Keyword(s):  
Control Algorithm ◽  
Power Plants ◽  
Reactive Power ◽  
Voltage Drop ◽  
Analytical Calculation ◽  
Electricity Distribution ◽  
Simulation Experiments ◽  
Distribution Lines ◽  
Transformation Ratio ◽  
And Control

The voltage instabilities in the distribution lines are primarily related to the integration of photovoltaic power plants with the local grids. Conventional tap-changers cannot compensate for the rapid disparities between generated and consumed power because of sluggish dynamic response. This article presents an effective method and control algorithm to improve the voltage instabilities of distribution lines. Analytical calculation confirms that the application of capacitive reactive power on load is beneficial to keep the voltage at the permissible level. Importantly, the severe concern about the current increment with voltage enhancement is also addressed. The dynamic behavior during capacitance switching is studied using simulation experiments. It is suggested that capacitance is connected to the load for the only time of voltage drop until the transformation ratio changes to the desired level. This article provides an explanation and solution for voltage deviations of electricity distribution lines in steady-state and dynamic modes.

Design of Dual-Power Supply Automatic Switching Device without Disturbance

2013 ◽  
Vol 394 ◽  
pp. 284-288
Author(s):  
Zhi Qiang Du ◽  
Xiao Fei Zhang ◽  
Tong Fang Ma ◽  
Li Juan Feng
Keyword(s):  
Power Supply ◽  
Power Supply System ◽  
Reactive Power ◽  
Voltage Drop ◽  
Voltage Fluctuations ◽  
Switching Device ◽  
Instantaneous Reactive Power Theory ◽  
Instantaneous Switching ◽  
Automatic Switching ◽  
Dual Power

The dual power supply system is widely used in our daily life. When power instantaneously switched between the main power and the stand-by power supply, the voltage fluctuations had the varying degree influence on machines. Based on the principle of correlation coefficient of two waveforms and instantaneous reactive power theory, the dual-power supply automatic and instantaneous switching device without disturbance is provided in this paper. The equipment could identify and isolate the broken-down power source in 5ms. At the same time, power supply keeps continuous meeting the requirements of power quality without voltage drop.

Low-Cost High-Speed Techniques for Real-Time Simulation of Power Electronic Systems

2007 ◽  
Author(s):  
R. E. Crosbie ◽  
J. J. Zenor ◽  
R. Bednar ◽  
D. Word ◽  
N. G. Hingorani
Keyword(s):  
Real Time ◽  
High Speed ◽  
Low Cost ◽  
Electronic Systems ◽  
Power Electronic ◽  
Real Time Simulation ◽  
Time Simulation

scholarly journals Neuro-Inspired Computing with Spin-VCSELs

2021 ◽  
Vol 11 (9) ◽  
pp. 4232
Author(s):  
Krishan Harkhoe ◽  
Guy Verschaffelt ◽  
Guy Van der Sande
Keyword(s):  
Processing Speed ◽  
Delay Time ◽  
High Speed ◽  
State Of The Art ◽  
Polarization Modulation ◽  
Time Interval ◽  
Computing Technique ◽  
High Modulation ◽  
Short Time ◽  
Modulation Speed

Delay-based reservoir computing (RC), a neuromorphic computing technique, has gathered lots of interest, as it promises compact and high-speed RC implementations. To further boost the computing speeds, we introduce and study an RC setup based on spin-VCSELs, thereby exploiting the high polarization modulation speed inherent to these lasers. Based on numerical simulations, we benchmarked this setup against state-of-the-art delay-based RC systems and its parameter space was analyzed for optimal performance. The high modulation speed enabled us to have more virtual nodes in a shorter time interval. However, we found that at these short time scales, the delay time and feedback rate heavily influence the nonlinear dynamics. Therefore, and contrary to other laser-based RC systems, the delay time has to be optimized in order to obtain good RC performances. We achieved state-of-the-art performances on a benchmark timeseries prediction task. This spin-VCSEL-based RC system shows a ten-fold improvement in processing speed, which can further be enhanced in a straightforward way by increasing the birefringence of the VCSEL chip.

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