Results 241 to 250 of about 80,798 (260)

Study on 24h Dynamic Reactive Power Optimization Considering Safety Operation Limit of Generators

2019 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia), 2019
In order to solve the practical problem of 24-hours dynamic reactive power optimization in power system dispatching, according to the limit output range of generator’s operation, this paper divides generator’s operation into three regions in PQ mathematical model and takes the action times of discrete control equipment as global inequality constraints,
Bin Lu, Xi Xu, Zhipeng Yu, Wen Wang, Xuenan Gu   +4 more
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A modified Newton–Raphson load flow scheme for directly including generator reactive power limits using complementarity framework

Electric Power Systems Research, 2014
Abstract A modified Newton–Raphson (NR) load flow scheme which automatically incorporates generator reactive power limits is proposed. Traditionally, handling generator reactive power limits is considered as an adjusted load flow solution and this adjustment is carried out through bus type switching method.
Lakshmi Sundaresh, P.S. Nagendra Rao
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A Smooth Power Flow Model of Electric Power System with Generator Reactive Power Limits Taken into Consideration

2005 IEEE International Symposium on Circuits and Systems, 2005
This paper deals with a power flow computation model in which generator reactive power limits are taken into account. The power flow computation in such a case includes a trial-and-error process, which mathematically implies undifferentiability. This paper illustrates a new differentiable power flow model that eliminates the trial-and-error process. In
Yuki Kataoka
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A new perspective on wind integrated optimal power flow considering turbine characteristics, wind correlation and generator reactive limits

Electric Power Systems Research, 2019
Abstract The operation of power system is facing newer challenges due to inherent uncertainty in wind generation. The current study fills the gap in the available literature by combining the nature of uncertainty of wind power in terms of varying wind speed correlation, turbine characteristics and generator reactive power limits.
M. Tripathy, Rajat Kanti Samal
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Global Approximation of Static Voltage Stability Region Boundaries Considering Generator Reactive Power Limits

IEEE Transactions on Power Systems, 2018
Power system static voltage stability region boundary (SVSRB) is a complicated hypersurface in parameter space. Due to inequality constraints such as generator reactive power limits, different critical points on the SVSRB may be related to different groups of active constraints and can be associated with different types of loadability limit, which ...
Yiwei Qiu, Hao Wu, Yonghua Song, Jianhui Wang   +3 more
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Probabilistic load flow incorporating generator reactive power limit violations with spline based reconstruction method

Electric Power Systems Research, 2013
Abstract The increase in the penetration of intermittent generation and uncertainty in load patterns calls for the need to include these uncertainties in the conventional power flow programs. Consideration of the generator reactive power limit violation is an essential aspect in load flow studies for planning. In this paper, a probabilistic load flow
Neeraj Gupta, Vinay Pant, Biswarup Das
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Voltage collapse precipitated by the immediate change in stability when generator reactive power limits are encountered

IEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications, 1992
When a generator of a heavily loaded electric power system reaches a reactive power limit, the system can become immediately unstable and a dynamic voltage collapse leading to blackout may follow. The statics and dynamics of this mechanism for voltage collapse are studied by example and by the generic theory of saddle node and transcritical ...
Ian Dobson, Lanxin Lu
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Limit Cycle Occurrence During Reactive Power Generation by Interlinking Converter in Hybrid Microgrids

Canadian Journal of Electrical and Computer Engineering, 2016
This paper is concerned with the analysis of an instability phenomenon, known as limit cycle, in hybrid microgrids (HMGs). The rapid growth of distributed energy resources and their integration into existing distribution networks has opened a new era for electricity generation and distribution markets.
Mehdi Baharizadeh, Hamidreza Karshenas, Jafar Ghaisari   +2 more
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A fast method for load margin estimation considering the reactive power generation limits

2016 IEEE Power and Energy Society General Meeting (PESGM), 2016
In the context of voltage stability, this paper describes a fast algorithm that estimates the maximum loadability point (MLP) of a power system from its power flow equations. First it estimates the load level where each generator reaches its reactive limit, this is done using a quadratic curve fitting technique.
Luan F. Colombari, Moussa R. Mansour, Rodrigo A. Ramos, Lus Fernando C. Alberto   +3 more
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Sufficient conditions for power flow insolvability considering reactive power limited generators with applications to voltage stability margins

2013 IREP Symposium Bulk Power System Dynamics and Control - IX Optimization, Security and Control of the Emerging Power Grid, 2013
For the non-linear power flow problem with PQ and reactive power limited slack and PV buses, we present two sufficient conditions under which the specified set of nonlinear algebraic equations has no solution. The first condition uses a semidefinite programming relaxation of the power flow equations along with binary variables to model the generators ...
Daniel K. Molzahn, Vikas Dawar, Bernard C. Lesieutre, Christopher L. DeMarco   +3 more
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