Accurate electricity price forecasting is a crucial issue concerned by market participants either for developing bidding strategies or making investment decisions. Due to the complicated factors affecting prices, accurate turns out be very difficult. The autoregressive integrated moving average (ARIMA) approach has been extended make hourly clearing (MCP) in spot markets with error correction and confidence interval estimation. ARIMA model used method implement are presented first. Then...

This paper deals with the application of method normal forms in analysis a specific aspect system dynamic behavior Manitoba Hydro system. Following major loss transmission capacity on HVDC (Nelson River system), and subsequent operation protection systems, there is deficit generation remaining system, comprising Saskatchewan. The applied to determine natural groupings which are formed by machines due nonlinear interaction. grouping then provides basis for developing systematic procedure island

Abstract An articulated pipeline walking robot is proposed, which a that can walk on the outer surface of with turning transition and certain climbing ability replace traditional method to improve efficiency inspection maintenance reduce safety risk manual work. The gait outside pipe studied. traveling mode for horizontal pipes, L-type T-type pipes other systems analyzed. robot’s analyzed using D-H coordinate method, shows proposed design feasible.

This paper presents an analysis of the financial performance The Walt Disney Company within entertainment and media sector, focusing on key data such as liquidity, solvency, profitability. Through a comparison Disney's short-term debt structure, long-term stability with those peer companies in same industry, namely Netflix Paramount, study will provide health profitability trends recent years. also encompasses how indicators reflect firm's operational efficiency ability to respond changes...

This study provides a new method for non-linear robust adaptive excitation controller design power systems. can be developed by using the back-stepping technique, but needs fewer conditions than conventional methods, which is more desirable in guaranteed to presence of model errors and disturbances, will adapt uncertain parameters. Meanwhile, over-parameterisation problem that usually appears some methods avoided. Simulations on 4-machine-2-area system East China demonstrate effectiveness...

Knowledge Tracing (KT) is crucial in education assessment, which focuses on depicting students' learning states and assessing mastery of subjects. With the rise modern online platforms, particularly massive open courses (MOOCs), an abundance interaction data has greatly advanced development KT technology. Previous research commonly adopts deterministic representation to capture knowledge states, neglects uncertainty during student interactions thus fails model true state process. In light...

Knowledge Tracing (KT) is crucial in education assessment, which focuses on depicting students' learning states and assessing mastery of subjects. With the rise modern online platforms, particularly massive open courses (MOOCs), an abundance interaction data has greatly advanced development KT technology. Previous research commonly adopts deterministic representation to capture knowledge states, neglects uncertainty during student interactions thus fails model true state process. In light...

With the recent trend towards deregulating power systems around world, transfer capability computation emerges as key issue to a smoothly running market with multiple transactions. Total Transfer Capability (TTC) is basic measure for evaluating available (ATC). The paper presents calculation of TTC through an optimal flow approach. objective function maximize sum sending end-end generation and receiving-end load specified buses. constraints are ac equations system operation limits....

An integrated design method for emergency frequency control of interconnected AC/DC power systems with centre inertia (COI) signals is proposed in this study. It aims to provide support from reserve-rich area(s) the disturbed through paralleled AC and DC tie-lines under extreme conditions, when normal automatic generation (AGC) suspended. With assumption area COI employment wide-area measurement system (WAMS), centralised strategy drives frequencies track overall by virtue coordination high...

In this paper investigation of nonlinear modal interaction using the normal form vector fields technique is extended to HVDC/AC power systems with DC modulation. The AC-DC interface equations are solved a state space model second order approximation. Using technique, system's dynamic characteristics obtained. proposed approach applied 4-generator test system, and compared time domain solution.

Abstract The power system small signal stability analysis considering wind generation intermittence is studied comprehensively in this paper. modelling of doubly‐fed induction generator (DFIG) involving the converters with application stator flux‐oriented vector control strategy addressed briefly. In order to reveal how intermittent nature affects operating behaviour an existing system, a probabilistic method based on Monte Carlo simulation technique proposed explore and exploit impact...

The variability and intermittency of wind generation have brought new challenges to the planning operation interconnected power systems with high penetration grid-connected farms. In this paper, probability theory fuzzy sets are employed carry out systematic thorough studies on system flow calculation incorporating uncertainties from different types turbines. Weibull distribution which can reflect well is used as speed density model. With possibility/ consistency principle(PPCP), it...

Fault diagnosis is of great importance to the rapid restoration power systems. Many techniques have been employed solve this problem. In paper, a novel genetic algorithm (GA) based neural network for fault in systems suggested, which adopts three-layer feedforward network. Dual GA loops are applied order optimize topology and connection weights. The first GA-loop structure optimization second one weight optimization. Jointly they search global optimal solution diagnosis. formulation...

A linearised differential-and-algebraic-equation (LDAE) model for power-system subsynchronous-resonance (SSR) study is proposed. The LDAE can be established quickly according to the element models and network topology. Generalised eigenvalue complex-torque-coefficient analysis SSR based on presented. effectiveness of proposed SSR-study methods verified through computer test results. suggested its relevant have potential work jointly with appropriate HVDC transmission FACTS-device obtain deep...

A unified approach has been proposed in the paper for processing unbalanced operating conditions transient stability calculations. The suggested method combined advantages of both abc phase coordinates and 012 sequence coordinates. former is used to describe faults since it suitable modeling simultaneous latter time simulation its sparse nature. Novel fault description coordinate conversion formulation presented. equivalent positive bus admittance matrix derived interface with generators...

A structure-preserved power-frequency slow dynamics simulation model is suggested for interconnected ac/dc power systems with automatic generation control (AGC) consideration, which will be applied to study relevant emergency in future so that the bulk system viability crisis caused by load-frequency can released. In model, network structure of entirely preserved, and multi-area dynamic load flow (DLF) developed simulation. The generator speed governor rotor dynamics, characteristics,...

This paper discusses the solution of optimal power flow incorporating wind generation cost. A new model cost is presented based on probability distribution farm output. In this model, consists two components: reserve capacity and environmental benefit loss. Both components could be attributed to intermittence uncertainties power. self-adaptive evolutionary programming method employed solve OPF with incorporated. case study conduced IEEE New England test system (10-Geneartor-39-Bus) as...

Fault section estimation (FSE) of large-scale power networks can be implemented effectively by the distributed artificial intelligence (AI) technique. In this paper, an efficient multiway graph partitioning method is proposed to partition into desired number connected subnetworks with balanced working burdens in performing FSE. The elements at frontier each subnetwork also minimised method. suggested consists three basic steps: forming weighted depth-first-search tree studied network;...

Power systems are undergoing a significant change by introducing competition. In market environment, the decentralised decision-making approach should be strongly encouraged so as to use an ‘invisible hand’ achieve efficient equilibrium. However, in current power markets, centralised is still widely used due lack of proper optimal methods, e.g. OPF for managing congestion and setting price. A management spot market, which can also discover price, proposed. this approach, each participant...