A new reactive power planning based on system multiscenario operations

Wang, Shihong; Ghong, Zhan; Rui, Hebing; QingMing, Xiao; Chen, Jian; Xu, Mingchang

doi:10.1016/j.egypro.2011.12.1011

Cited by 4 publications

(1 citation statement)

References 6 publications

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“…Apparent power is the product of the current and voltage of the electric load. Due to energy stored in the load and returned to the source, or due to a non-linear load that distorts the wave shape of the current drawn from the source, the apparent power can be greater than the real power [4]. Low-power-factor loads increase losses in a power distribution system and result in increased energy costs [10].…”

Section: Introductionmentioning

confidence: 99%

PLC based intelligent power factor correctors for industrial power systems-A case study

Kulkami¹,

Murthy²,

Raju³

2015

2015 International Conference on Power and Advanced Control Engineering (ICPACE)

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In recent years, the quality of power supplied to the consumer devices by an ac system has become an issue of great concern due to the rapidly increasing inductive loads, electronic equipments, power electronic devices and high system voltage.Power factor correction (PFC) is a technique of minimizing the undesirable effects of electric loads that create poor power factor conditions. Correction of power factor may be effected either by transmission utility which improves the stability and efficiency of the transmission network or by individuals customers.This paper aims at the correction method using an intelligent power factor corrector based on PLC (Programmable Logic Controller) as a control system especially for the correction of the industrial power factor, which is not only required for the smooth operation of the electrical equipments used in the industries but also to minimize the cost of penalty that has to be paid to power supply utilities for having low power factor. This involves measuring the power factor value from the supply line using Power Meter and development of a PLC program to determine and trigger capacitor banks of required rating in order to compensate deficient reactive power, thus bringing power factor near to unity. The results of this paper is based on the case study on application of the proposed method in a real industrial facility.

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Section: Introductionmentioning

confidence: 99%

PLC based intelligent power factor correctors for industrial power systems-A case study

Kulkami¹,

Murthy²,

Raju³

2015

2015 International Conference on Power and Advanced Control Engineering (ICPACE)

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Multi Objective Differential Evolution approach for voltage stability constrained reactive power planning problem

Roselyn

Devaraj

Dash

2014

International Journal of Electrical Power & Energy Systems

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A convex chance-constrained model for reactive power planning

Lopez

Pozo

Contreras

et al. 2015

International Journal of Electrical Power & Energy Systems

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The present study evaluated the effectiveness of a dicalcium and tetracalcium phosphatebased desensitizer in reducing dentin permeability in vitro. Dentin fluid flow was measured before and after treatment of dentin with patent dentinal tubules using 1 or 3 applications of the dicalcium and tetracalcium phosphate containing agent Teethmate TM (TM) and comparing the results with two sodium fluoride varnishes Vella TM (VLA) and Vanish TM (VAN), after storage in artificial saliva for 24 h, 48 h and 7 days. Significant differences were observed among the 4 methods employed for reducing dentin permeability (p < 0.001) and the 3 posttreatment times (p < 0.001). VLA and VAN never achieved 50% permeability reductions consistently in any of the 3 time periods. Only the calcium phosphate-based desensitizer applied for 3 times consistently reduced dentin permeability by 50% after 24 h. When applied once, the permeability reduction of TM increased progressively over the 3 time periods. After 7 days, only one and three applications of the calcium phosphate-based desensitizer consistently reduced dentin permeability by more than 50%. Permeability reductions corresponded well with scanning electron microscopy examination of dentinal tubule orifice occlusion in dentin specimens treated with the agents. Overall, the dicalcium and tetracalcium phosphate-based desensitizer is effective in reducing dentin permeability via a tubule occlusion mechanism. The ability of the agent to reduce dentin permeability renders it to be potentially useful as a clinical dentin desensitizing agent, which has to be confirmed in future clinical studies. By contrast, the two sodium fluoride varnishes are not effective in dentin permeability reduction and should be considered as topical fluoride delivering agents rather than tubular orifice-blocking agents.

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A new reactive power planning based on system multiscenario operations

Cited by 4 publications

References 6 publications

PLC based intelligent power factor correctors for industrial power systems-A case study

PLC based intelligent power factor correctors for industrial power systems-A case study

Multi Objective Differential Evolution approach for voltage stability constrained reactive power planning problem

A convex chance-constrained model for reactive power planning

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