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In recent years, problems regarding the voltage stability have been of vital importance at EHV and UHV level because of its sensitivity to active and reactive power changes. Beside, conversion of three-Phase Double-Circuit (3PDC) to six-Phase Single-Circuit (6PSC) line is known as a well method to increase the power transfer capability. The voltage stability problem has received little attention in...
A new emergency DC power supply (EDCPS) control strategy for multi DC system is presented to improve system stability, when a fault results in one DC system blocked. Furthermore, a coordination control strategy for reactive power among HVDC converter stations is put forward in concert with EDCPS. An important feature of the method proposed is that it makes full use of the available AC filters of the...
Reactive compensation of transmission makes the PV curve flatter and could potential lead to loss of sufficient discrimination between the normal operating and critical voltage. This can make it difficult to distinguish critical voltage from the normal metered operating voltages during highly stressed transmission operation. Further, instrument transformers are known to contain both magnitude and...
The voltage stability and the sensitivity of power grid are presented by introducing the P-V and the Q-V curves based on the dynamic load. Firstly, a power grid is exactly rewritten into a simple equivalent decentralized system by the power flow calculation. Next, the dynamic load is modeled in a higher order polynomial form identified from the data at a load-bus observed in Sweden. Then, the system...
The most important requirement of a power system for maintaining desired voltage profile and voltage stability is the existence of sufficient amount of reactive power reserve in the proper location of the power system. The requirement to locally generate reactive power, has made determining the installation point to be a requirement. In this paper some methods for identification of critical buses...
Knowledge of the load composition and characteristics, such as corresponding PV curves, are necessary tools for the voltage stability analysis. This paper investigates small industrial induction motors that are operated under different mechanical load conditions. Experimental tests were performed to determine the system's PV characteristics and assess the voltage stability under different loading...
Stabilizing control for power system stability has been applied to generators equipped with excitation controller and speed governor. Recently, power electronics-based control devices have been the focus of research and development for the improvement of dynamic stability. Power electronics control devices are utilized for control of the power flow on a transmission line or the reactive power in a...
A new approach to ANN-based real time voltage stability monitoring and reactive power management in a power system has been proposed in this paper. In this approach a separate ANN has been trained for each of the vulnerable load buses in the system from the voltage stability point of view. The vulnerable load buses of the system are identified by modal analysis of the system reduced Jacobian (of Q-V...
Electric power network stability analysis requires that all system components are represented by their models. Usually, detailed data about system components such as generators, transformers and transmission lines are available. In this case accurate models can be derived from the network devices. However, corresponding data for individual loads are not always available, which makes the modelling...
The steady state stability limit of turbine generator with automatic voltage regulator (AVR) extends steam turbine's safe range under exciting operation compared to generator without AVR. Therefore, Paper analyzes the parameter of AVR's effect on steady state stability limit of turbine generator, and verifies the conclusion with the simulation model in Matlab/Simulink environment.
In a power system, voltage stability margin improvement can be done by regulating generators voltages, transformers tap settings and capacitors/reactors rated reactive powers (susceptances). In this paper, one of these methods which we name ldquoreactive power rescheduling with generator rankingrdquo is considered. In this method, using ldquoranking coefficientsrdquo, the generators are divided into...
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