Reactive Power Balance Research Articles

Insecure System Reactive Power Balance Analysis and Counter Measures

Insecure System Reactive Power Balance Analysis and Counter Measures

Insecure System Reactive Power Balance Analysis and Counter Measures

One of the consequences of a calamitous system disturbance can be a mismatch of a system's reactive power demand and its reactive power resources. Power system collapses have occurred for both situations-when there has been a reactive power deficit and a reactive power surplus.

Advanced Scheme for AC Voltage Control at HVDC Converter Terminals

A new economic and effective scheme for controlling the ac voltage at the HVDC terminals during both steady state and dynamic conditions is presented. By extending the basic characteristics of an HVDC converter, it is possible to affect and modulate the reactive power balance on the ac side. Analytical studies as well as digital and simulator results are presented to demonstrate the viability of the proposed ac voltage control strategy to optimize HVDC terminal design and performance for a practical system. The economic and technical features of the new scheme are discussed and compared with other ac voltage control techniques such as synchrononous condensers and static VAr compensators.

Voltage Stability Analysis in Electric Power Systems by Nonlinear Programming

ABSTRACT Voltage instability phenomena in electric power systems are characterized by a progressive lowering of receiving end voltages beyond their nominal values.Particularly, a voltage collapse occurs at a load node when the active power fed from the load reaches a maximum value. On the basis of this observation a new method for the analysis of the voltage stability in power systems is presented.The suggested approach derives the critical voltage stability conditions for the system through the solution, by non linear programming techniques, of a non linear constrained optimization problem which considers as objective function the active power demand at a prefixed load node and as constraints the active and reactive power balance equations at the system nodes and the practical operating capabilities of generators. The method proves suitable for a rigorous individualization of the factors which affect voltage instability phenomena and can advantageously be used for planning and operation of electric power...

サイクロコンバータを用いた無効電力補償装置の無効電力平衡に着目した動作解析と補償限界

サイクロコンバータを用いた無効電力補償装置の無効電力平衡に着目した動作解析と補償限界

On the changes in the fundamental component caused by the higher harmonic components in an oscillator with resistive nonlinearity

In an oscillator with nearly sinusoidal voltage, the change ΔI 1 , of the fundamental component of current owing to the presence of higher harmonic voltage components V n , can be expressed as a function of V n . It is shown that the relation for Im ΔI 1 corresponds to Groszkowski's law of reactive power balance of harmonics. An interesting relation between Re ΔI 1 and the sum of real powers of the higher harmonics is found.