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This paper introduces two novel metrics to judge the capability and influence of wind power to provide virtual inertia response (i.e. frequency support). The first metric considers the generation unit (i.e. wind turbine generator (WTG)/wind farm (WF) vs. synchronous generator). This metric is applied to compare between three different methods of provision of frequency support. The second metric assess...
The paper focuses on the evaluation of locally-made biogas-powered generators to determine its electrical performance efficiency using the purified fuel. Since the demand of energy in the world is greatly increasing, the efficiency and financial concerns of the system is a major aspect. Locally-made biogas generator was chosen for the study due to its availability and abundance in the Philippines...
There are different innovative concepts to localize disturbances with an electromechanical impact in power systems using synchronized frequency measurements from Wide Area Measurement Systems. This paper investigates five approaches, of which four are mainly discussed and one is novel: Gradient Search, Triangulation, Parzen Windows, Probability Circles and Time Distance Ratios. The similarities and...
This paper proposes a novel decentralized control strategy for the complex power system with persistent bounded disturbances and nonlinear interconnections. The recursive design method is adopted to construct the decentralized feedback control law. The developed feedback control law improves the disturbance rejection performance of the corresponding closed-loop interconnected system in the sense of...
The problem of controlling a variable-speed-variable-pitch wind turbine in non conventional operating points is addressed. We aim to provide a control architecture for a general active power tracking problem for the entire operating envelope. The presented control enables to cope with system non linearities while handling state and input constraints, and avoiding singular points. Simulations are carried...
This paper is an overview of Power System Simulation Toolbox (psst). psst is an open-source Python application for the simulation and analysis of power system models. psst simulates the wholesale market operation by solving a DC Optimal Power Flow (DCOPF), Security Constrained Unit Commitment (SCUC) and a Security Constrained Economic Dispatch (SCED). psst also includes models for the various entities...
This paper presents a suitable sustainable standalone power system for an off-grid town in Western Australia. To reduce the percentage of the electricity generated by a diesel generator in this remote town, the considered sustainable system consists of wind turbines, a photovoltaic system and a battery storage system, on top of a diesel generator. The analysis first aims to define a suitable sustainable...
Voltage disturbances in power systems are caused by various events such as faults or control actions. It is important to accurately identify them for fast remedial response and damage prevention. Recently, data mining techniques have been applied in power system research, usually from the perspective of the entire system. The analyzed data include measurements from transmission buses, substations,...
Power system operators have traditionally addressed system uncertainty through the scheduling of operating reserves. These reserves are excess capacity, either online or offline, that can quickly be used to address unforeseen events in the load profile. As renewable energy resources, namely wind and solar, new techniques are being developed to address the uncertainty introduced from these sources...
Nodes in power system are aggregated into multiple zones for the allocatian of transmission usage prices. The formation of zones depends on a set threshold, connectivity and type of pricing mechanism. In this paper, a novel concept to club the nodes into zones that are closely connected and experience similar usage prices, for few of the popular transmission pricing mechanism such as equivalent bilateral...
Wind energy is widely considered as a major source of clean energy. As such, wind turbines are becoming popular in the renewable energy world. The output of the wind turbine varies with randomly changing speed of the wind. This is a critical problem for wind turbines in general, and fixed speed wind generators in particular. However, conventional pitch controllers and governor control systems are...
A novel configuration of a compressed air assisted wind energy conversion system is proposed to capture the mechanical spillage of a wind turbine and store it as the compressed air. The compressed air storage could be used to supplement electric power generation. The compact design utilizes the surplus capacities of blades and generator, and combines the compressor and expander into one machine. The...
Nowadays the propulsion electrification of ships is under intensive research. During this course, a very attractive option is the use of shaft electric machines, which is an intermediate step between the classic ship configuration and the all-electric one. However, two problems arise: (1) power dispatch should be carried out based on the Lagrange method or dynamic models, instead of simplistic methods...
This paper formulates a power system related optimal control problem, motivated by potential cyber-attacks on grid control systems, and ensuing defensive response to such attacks. The problem is formulated as a standard nonlinear program in the GAMS optimization environment, with system dynamics discretized over a short time horizon providing constraint equations, which are then treated via waveform...
Utility scale battery storage will soon reach a level of maturity where the modular design of the technology and aggregation will allow custom-built solutions for energy and ancillary service needs of the power system. Several projects are in the demonstration phase worldwide and hold promise for successful incorporation of battery storage into traditional power systems operations. In contrast to...
With a growing emphasis on energy efficiency and system flexibility, a great effort has been made recently in developing distributed energy resources (DER), including distributed generators and energy storage systems. This paper first formulates an optimal DER coordination problem considering constraints at both system and device levels, including power balance constraint, generator output limits,...
This paper investigates the scheduling horizon of power system containing wind and concentrating solar power (CSP) plants with thermal energy storage (TES). CSP plant with TES can be used to reduce the uncertainty of renewable generation and provide services to power system. However, forecast error of wind/solar is strongly related to the forecast horizon. When CSP plant with TES is incorporated into...
Economic dispatch problem (EDP) is an important optimization problem in modern power system. When involved with valve-point loading effect, this problem becomes a complex non-convex and non-linear optimization problem. In this case, many researchers adopt evolutionary algorithms to solve it. An equality constraint, the power balance constraint, exists in this problem. This constraint leads some common...
Renewable energy is becoming increasingly important to isolated power systems (IPS) as they seek to reduce their emissions and operational costs. Australian IPS typically supply energy to consumers using both renewable and diesel generation termed a hybrid IPS. As renewable penetration increases within a hybrid IPS, a potential conflict arises, with the diesel generators unable to lower their output...
This paper studies physical consequences of worst-case unobservable false data injection (FDI) attacks on the electric power system. In particular the focus is on FDI attacks wherein the attacker can only change measurements in an attack sub-network of the entire network and has limited knowledge of network parameters outside of this sub-network. The goal of this limited resource attack is to cause...
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