On the equilibria of power systems with nonlinear loads

1989 ◽  
Vol 36 (11) ◽  
pp. 1458-1463 ◽  
Author(s):  
D.J. Hill
Keyword(s):  
Power Systems ◽  
Nonlinear Loads

A Quick Response Power Factor Detector for Nonlinear Loads

2013 ◽  
Vol 284-287 ◽  
pp. 2433-2438
Author(s):  
Maoh Chin Jiang ◽  
Bing Jyun Shih
Keyword(s):  
Power Systems ◽  
Transient Response ◽  
Power Factor ◽  
Nonlinear Loads ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Active Power Filters ◽  
Power Filters ◽  
Low Pass ◽  
Fast Power

A fast power factor detector for nonlinear loads is proposed to overcome the drawback of conventional detectors, which can measure only the power factor of linear loads. The design of the proposed detector is based on the concept of additional characteristic of trigonometric function. It does not require any low-pass filter or integrator. Therefore, the transient response of the proposed detector is much faster than that of the conventional detectors. The theoretical response time of the proposed detector is less than one-fourth of a cycle. Because of its promising accuracy and rapid transient response, it can be used in many systems such as the control of power systems, and active power filters, to improve their transient performance. Theoretical analysis and experimental results are also detailed in this paper.

scholarly journals Cooperative Control of Active Power Filters in Power Systems without Mutual Communication

2010 ◽  
Vol 2010 ◽  
pp. 1-13 ◽  
Author(s):  
Josef Tlustý ◽  
Jiří Škramlík ◽  
Jan Švec ◽  
Viktor Valouch
Keyword(s):  
Power Systems ◽  
Power System ◽  
Cooperative Control ◽  
Harmonic Load ◽  
Nonlinear Loads ◽  
Power Circuit ◽  
Active Power Filters ◽  
Power Filters ◽  
Node Voltage ◽  
Mutual Communication

The procedure for calculating controller parameters of the APFs implemented into a multibus industrial power system for harmonic voltage mitigation is presented. The node-voltage-detection control strategy is applied and the basic controller parameters are found under the condition that the demanded THD factors at the buses where the APFs are placed will be obtained. A cooperative control of several APFs without mutual communication is proposed, simulated, and experimentally verified. By tuning the controller gains without considering the power circuit parameters, all APFs used tend to share harmonic load currents approximately equally regardless of the operation modes of the nonlinear loads in different parts of the power system.

A New Central Control Scheme for Future Micro-Grid Systems Considering Variable Speed Drive Systems and Fuzzy Logic Control System

2019 ◽  
Vol 8 (2) ◽  
pp. 25-46
Author(s):  
Safwan Mhrez Nadweh ◽  
G. Hayek ◽  
Bassam Atieh
Keyword(s):  
Power Systems ◽  
Power Quality ◽  
Electrical Power ◽  
Variable Speed ◽  
Nonlinear Loads ◽  
Distortion Factor ◽  
Variable Speed Drive ◽  
Grid Systems ◽  
Micro Grid ◽  
Drive Systems

The increased use of nonlinear loads in power systems have caused problems with the quality of electrical power systems, which affects its performance. One of the most important nonlinear loads is variable speed drive systems (VSDS) which causes issues to the industrial plants power supply. In this article, the authors compare different control methods to apply the bias voltages required to operate transistors in the four-quadrant chopper which added to the dc- link of the variable-speed drive system in order to improve power quality, considering future micro-grid systems. A selection is then made of the appropriate one that improves power quality specifications. This article discusses the issues related to VSDS, such as total harmonic distortion factor THD%; the ripple factor of the DC current and voltage of the VSDS; and its harmful effects on the power system.

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