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Renewable technology based Micro Grid (MG) are mostly implemented with power electronic devices. Those MGs have no or very small aggregated physical inertia, depending on the generation technology used. Reduction in system inertia may have negative influence on stability of the system where the MG is integrated. Conversely power injection from MG might reduce line congestion, stress on synchronous...
The ever-increasing trend of extracting electrical power from renewable resources is encouraging addition of more and more wind generation to the grid. However, the integration of added wind generation is compromising the stability of the system as wind generation technologies differ from that of conventional generation. Hence, there is an urgent need to investigate influence of various wind generation...
This paper used a twofold method to assess and select suitable control input for PV supplementary wide-area damping controller (WADC) in large-scale interconnected system. The geometric measure of controllability/observability index is used to preselect the input signals for WADC. Then, the Hankel interaction index (HII) is Calculated for each subsystem considering signal transmission delay to determine...
Along with a number of benefits, large penetration of distributed generation (DG) units in the distribution system imposes some serious challenges for power engineers. Slow voltage recovery under post-fault condition turns up as one of the most critical problems in small DG integration. Majority of the small DG units trip due to lack of fault ride-through (FRT) capability, and hence, challenges the...
The penetration level of renewable based distributed generation (DG) has increased rapidly in recent years. Grid standards demand small DG units to operate with constant power factor control mode and large DG units with voltage control mode. As a result, small DG units are exposed to the problem of slow voltage recovery due to contingencies like fault. This paper proposes a new sensitivity index based...
Factors like diminishing fossil fuels and environmental concerns are driving the integration of locally available energy resources at a distribution level. As a result, a number of stability issues have become a concern for utilities at distribution systems. One of the important stability concerns is the small signal stability caused by electromechanical or other low frequency oscillations. The oscillations...
In this paper, the effect of increased solar power penetration by three Photovoltaic (PV) generator systems on inter-area oscillation is investigated. With the help of an illustrative example, it is shown that general trends for PV generator is to increase the damping of inter-area mode oscillation. However, there are exceptions for certain types of system, location and penetration for which PV generator...
Voltage instability is considered as one of the main threats to secure operation of power system networks around the world. Grid connected renewable energy-based generation are developing in recent years for many economic and environmental reasons. This type of generation could have significant impact on power system voltage stability given the nature of the primary source of generation and the technology...
In recent years there has been an increasing focus on distributed generation, due to the benefits they bring to the distribution network and to consumers. To maximize these benefits, such as loss minimization, generator locations and sizes must be carefully determined. Currently few methods in the literature can allocate multiple types and multiple numbers of distributed generators simultaneously,...
The integration of large-scale distributed generation (DG) and energy storage significantly affect the dynamic behaviors of distribution systems. Distributed systems are facing new challenges in terms of their dynamic behaviors due to the addition of large-scale DG into low-voltage distribution systems. This paper analyses the important effects of the penetration of large-scale wind, solar and energy...
Integration of small distributed generation (DG) units to weak distribution system is a major concern for power system engineers. Recent grid standards demand small DG operation with power factor control mode. Lack of sufficient reactive power support brings the problem of slow voltage recovery under post-fault condition. This paper presents a comprehensive VAR planning with a mixture of both static...
Intermittent and slow generator like PV is augmented with auxiliary device to meet the certain grid code requirements for interconnection. Ultracapacitor, battery energy storage system (BESS) or shunt capacitor at the PV terminal have recently been used as auxiliary devices for large-scale PV generator system to improve the system performance during transients. Although the studies on individual auxiliary...
Renewable energy based generations are connected at subtransmission and distribution levels and are normally dispersed throughout the network. This causes a number of benefits and challenges for power system operators. This paper outlines voltage and small signal stability issues for a distribution network and provides a number of case studies.
Power system low frequency oscillations influence dynamic behaviour of a complex power system and threaten its security. The dynamic performance of power system can be improved by damping low frequency oscillation with the help of supplementary controllers. This paper presents the design of supplementary controller for Static Var Compensator (SVC) to damp low frequency, in particular inter-area oscillations...
This paper presents the impact of large-scale photovoltaic (PV) generation on power system oscillatory instability. Two models of PV generation systems, namely detailed dynamic and simplified models, have been studied in IEEE-14 bus test system typically used for power system oscillatory instability studies. Influence of radiation pattern, and size and location of PV generating system on the power...
Low frequency oscillations with growing amplitude can be a threat to secure operation of power system. Such oscillatory behaviour can be dealt with proper design of supplementary controller with the best input signal. This paper presents a design of supplementary controller for static Var compensator (SVC) using H∞ loop-shaping technique to damp low frequency, in particular inter-area oscillations...
This paper presents voltage stability in power systems when connected by wind farm generators. Two models of wind generator, namely squirrel cage induction generator and doubly fed induction generator are used and based on steady-state model. P-V curve is used to express maximum loading factor in power system when wind farm was installed. The test IEEE 14 bus system is selected to show proposed performance...
This paper presents the impact of large scale PV generation on Bangladesh power system oscillatory and static voltage stability. First, the eigenvalue of the system without and with PV based generator has been analyzed. Then system loading margin is studied without and with PV based generator. The influence of radiation, position, and penetration of PV based generator on system is considered for the...
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