Cascading outages can have a catastrophic impact on power systems. One such recent incident was the September 8, 2011 blackout that affected San Diego and large parts of southwestern United States. To prepare for events, NERC transmission planning standards require utilities to plan <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">${n}$ </tex-math></inline-formula> -1-1 outages. However, analyses be...

The penetration of renewable energy resources, such as wind and solar, is continuously growing in power system grids their interconnection low short-circuit (LSC) systems (aka weak grids) becoming more frequent. Converter interfaced resources have controls dynamics that differ from traditional synchronous generators require sufficient modeling for potential instabilities to be analyzed prevented both planning operations environment. In this work, instability scenarios related converter...

The past few decades have seen a rapid proliferation of distributed generation sources. These sources can be located at or near load centers and provide benefits which traditional may lack. However, distribution systems were not designed to accommodate such power as they might cause bidirectional flow other potential problems unexpected conditions. This paper investigates the impact two different types PV on test feeder. A realistic system has been modeled comparative study done for loading...

Oscillations with very low frequency at 0.1 Hz, have been observed in voltage and var practical solar photovoltaic (PV) systems when power exporting ramps up to a certain level. This letter provides an explanation on the formation of 0.1-Hz oscillations identifies three critical factors that lead oscillations: communication delay between plant-level control inverter-level control, high volt/var sensitivity level, volt-var feedback system consisting plant inverter grid impact. Furthermore,...

Accurate representation of system loads is critical for performing power dynamic studies. As date, in positive sequence bulk studies, the WECC composite load model state-of-the-art representing aggregated behavior at substation bus. Although used widely, this continuously undergoing improvements to ensure that a reasonable different components can be obtained. One such refinement development response VFDs. This paper proposed generic capture large number VFDs connected bus The was developed...

One of the most important aspects time-domain simulations for power system planning studies is load modeling. For a realistic representation load, Western Electricity Coordinating Council (WECC) model validation and working group developed composite model. The represents aggregation different types loads at substation level. However, there exists some uncertainty in determining parameters percentage composition components. Trajectory sensitivity (TS) analysis provides systematic approach to...

Parameter estimation plays a crucial role in load modeling. The aggregated nature of the model and large number tunable parameter makes task challenging. Therefore, deeper understanding process is required. Sensitivity analysis provides useful insight into process, which can make more efficient systematic. importance sensitivity highlighted this paper through an example.

As the number of distributed energy resources (DERs) continues to increase, DER response during a fault is becoming critical power system stability. In near future, DERs are expected provide advanced functions such as voltage ride through and dynamic support maintain stable operation. this context, an aggregated model that includes these has been developed previously under composite load structure. order parameters appropriate for actual distribution system, however, simulations based on...

With the spread of distribution connected inverters on a feeder being hidden from transmission planner, ability to represent under voltage tripping characteristic an aggregation in planning study is becoming increasingly important. In this paper, parameters partial trip recently approved positive sequence aggregated distributed energy resource model will be developed. deriving these parameters, uncertainty associated with location feeder, impact <tex...

This paper develops a method for computing probabilities of contingencies P1-P7 specified by the North American Electric Reliability Corporation (NERC) Standard TPL-001-4. These are useful performing industry-based probabilistic planning power flow studies. Markov models provided that characterize TPL contingency types P1-P7, and data processing necessary to estimate model parameters is described based on NERC collection systems GADS, GADS-Wind, TADS, MIDAS. A software system called...

Reliability issues in the wake of major blackouts have spurred a discussion on development reactive power markets. In 2003 North American blackout, deficiency was identified as one causes for propagation blackout. This event to an extent motivated federal electricity regulatory committee (FERC) explore idea paper investigates need system, present compensatory structures and new market suggested literature. A survey practices regarding compensation associated drawbacks has been presented....

The increased reliance on digital services, growth of big data analytics, and popularity cloud-based among other things, have led to the recent boom in centers. North America leads world total number installed centers, it is estimated that peak megawatt (MW) capacity around 4,458 MW, with another 1,144 MW under construction according latest assessment by CBRE, a commercial real estate services investment firm based America. Notably, Silicon Valley (California), Northern Virginia, Atlanta...

Regional inertia challenges can emerge in a large power system if high, local penetrations of renewable generation begin to create weakly connected, low regions within the system. These may be exposed frequency deviations or rate change (RoCoF) event loss infeed/outfeed such region. This paper presents screening methodology that identify potential regional issues without using time domain simulations. provides basis for transmission planners screen coupled and thereby take necessary actions...

This study investigates the operation of inverter-based resource (IBR) plants in a bulk power system, under different grid-strength conditions and for various penetration levels static dynamic loads. For this purpose, Monte-Carlo EMT simulations have been performed on combined transmission-distribution network PSCAD/EMTDC software. The four active distribution feeders are connected at locations system. Each feeder comprises three-phase induction motor loads, single-phase average-model...

One of the most challenging research problems in natural language processing (NLP) is that word sense induction (WSI). It involves discovering senses a given its contexts usage without use inventory which differentiates it from traditional disambiguation (WSD ). This paper reports work on Bengali, less-resourced language, based distributional semantics and translation context vectors learned parallel corpora to improve task performance. The performance proposed method was compared with...

High phase order transmission systems (e.g., n <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">φ</sub> ≥ 6) are revisited with a specific focus: the operation of polyphase system one out service. The resulting voltage at load end circuit is considered for unbalance calculation. Envisioned temporary outages to allow repairs phase. concept single pole switching stability enhancement three-phase during fault can be found in literature. This paper...

High phase order transmission systems are studied with attention to the operation of polyphase one out service (open circuited). The case above three is investigated. intent identify operating and design scenarios that result in acceptable even open circuited. Envisioned temporary outages (e.g., allow repairs) phase; cases which opened momentarily reclosure successful. Considered as measures acceptability voltage unbalance, regulation power transfer upon opening phase. concept single pole...