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Voltage instability has becoming one of the major concern for power systems utilities nowadays. It is believed as one of the major drives of the blackouts. Moreover, nowadays, many loads are single-phase small air conditioning motors which are prone to stall when the voltage falls because of short circuits in transmission lines. Excessive motor stalling may cause the system to experience voltage collapse...
The modelling of synchronous generators or synchronous compensators and static var compensators have been studied for voltage stability studies. The best models were established with active voltage control and with loss of control. The voltage stability indexes were evaluated. In all cases, the loss of control proved to have a negative impact on voltage stability conditions.
The complexity of voltage collapse problem has increased with increasing interconnections between independent power systems. When a bulk power transmission network (generation and transmission system) is operated close to the voltage stability limit, it becomes difficult to control the reactive power demand for that system. As a result, the system voltage stability is affected, which if undetected...
This paper will explain the dynamics of slow voltage instability on large power systems at a basic and intuitive level. This paper will outline the voltage instability phenomenon and leave the specific details for individual investigation. Slow Voltage Instability is a phenomenon which occurs over several minutes to an hour; where as Transient Voltage Collapse occurs over several seconds. Understanding...
Integration of wind turbines may have significant impacts on power system operation. Generation of electricity from wind power has received considerable attention. Induction machines are the one which are widely used as generators in wind power based generations. This paper analyzes the impact of integrating wind generation on the voltage collapse and loading parameters of the network of Kathmandu...
Assessment of voltage stability of a multi-bus power network in an equivalent mode is a new era of research in the field of power system operation and control which may prevent the system for unusual voltage collapse in a faster way. As FACTS controllers are now an inescapable part of power system, in this paper two major FACTS devices i.e, Thyristor controlled series capacitor (TCSC) and Static synchronous...
Static load which is known for three different characteristics i.e. constant power, constant current and constant impedance shows a different voltage profile because both of their real power and reactive power vary differently as the voltage varies except for constant power. This paper will analyze the impact of each load characteristic individually and also as combination on voltage stability of...
In this paper, a continuation method is applied to a power system in order to compute the voltage dynamic stability limit. After modeling of the synchronous machine, we define the voltage stability; a simple example model has been investigated where we use a constant voltage source. The implementation of the continuation method for funding solution boundary curves is given to prove the utility of...
Current methods in which maximum sizes of new wind farms are determined do not take into consideration their impact on future wind penetration levels. In this paper, two methods are proposed to determine maximum sizes of multiple new wind farms for maximizing wind penetration levels. In both methods, each new wind farm size is determined using an iterative process where each wind farm's size is incremented...
In this paper a computer package-NETOMAC, which is developed by Siemens power transmission and distribution group and used to analyze system voltage collapses in time-domain, is presented. The components, which significantly affect the voltage stability, are modeled in detail with the NETOMAC controllers in the simulation process. The advantage of NETOMAC is that it can simulate nearly all dynamic...
It is necessary to simulate accurately the voltage response characteristics of load in voltage stability assessment and control of power system. The post-contingency load dynamic restoration is one of the direct reasons of mid-long term voltage instability or voltage collapse. A new continuation power flow (CPF) model for simulating the load time-domain dynamic restoration is proposed in this paper...
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