Reactive Power Scheduling Research Articles

Evaluation of Economy and/or Security Oriented Objective Functions for Reactive Power Scheduling in Large Scale Systems

Evaluation of Economy and/or Security Oriented Objective Functions for Reactive Power Scheduling in Large Scale Systems

The Han Powell Algorithm Applied to the Optimization of the Reactive Power Generation in a Large Scale Electric Power System

In this paper the Han-Powell algorithm is proposed as a means for optimizing the reactive power generation in a large scale system. The algorithm is based upon the iterative resolution of quadratic programming subproblems. Other approaches based upon recursive resolution of linear programs seem not to be suitable for the strongly non linear characteristics of the problem.In the adopted model, a reduced and compact problem is solved with only inequality constraints.The equality constraints (load flow equations) are utilized to eliminate a large number of variables (dependent variables). In this way the optimization model is expressed only in terms of the control variables (reactive power generations or generator terminal voltages and LTC transformer tap positions). This approach allows ns to perform the reactive power scheduling of the Italian electric production and transmission system (with about 500 nodes) with reasonable computer requirements (CPU time and central core). The main advantages of the Han-Powell method are:-it is robust and reliable-it shows a sure and fast convergence-it is easy to implement provided a good quadratic programming subroutine is available.

Optimal active‐reactive hydro‐thermal schedules using functional analysis

AbstractA new approach to the hydro‐thermal optimal active and reactive power scheduling problem is proposed. The optimal schedules for a system with thermal and common‐flow hydro‐plants are obtained. The active‐reactive power balance model of the electric network is introduced. Although not as accurate as the load‐flow model, the present model is simpler. The scheduling problem is solved by use of the minimum norm formulation of functional analytic optimization.

Influence of Generator Capability Curves Representation on System Voltage and Reactive Power Control Studies

The influence of generator capability chart representation (overexcited zone) on system voltage and reactive power control studies is examined. A load pick-up in a power system is simulated by means of a computer program and the steady--state operation in some "critical" conditions (heavy power flows and low power factors) is analyzed. Under these conditions the adoption of the simplified representation (rectangular) or of a more exact representation of the actual capability charts, may influence the search for feasible solutions to a considerable extent. Possible criteria for the optimization of system voltage and reactive power scheduling in critical conditions are also discussed on the basis of this more L exact representation.