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In this paper, a Wide Area Control (WAC) scheme cooperates with Renewable Energy Sources (RESs) to achieve a robust power oscillation damping. The WAC signals are synthesized by a two-level hierarchical controller which utilizes global measurements from all the installed synchronous generators to maximize the performance of the generators' local controllers. In the proposed WAC scheme, the dynamic...
This paper investigates the dispatch of diesel generators in Kinmen Island power system with wind power generators. Because wind conditions are somewhat unpredictable, it is difficult to provide a stable base load of power to the grid from wind energy. To ensure an adequate supply of energy at all times, wind energy needs to be combined with other sources. To know the dynamic behavior of the system,...
Renewable Energy (RE) units especially grid connected Wind and Solar PV which have no rotational inertia are effectively displacing the conventional generators and their rotating systems. This reduces both the cost of generation and environmental effects. However, this has implications on the frequency stability in that frequency dynamics become faster with low inertia. This makes frequency control...
This paper joins the developing trend of modeling distributed generators based on dq0 quantities, and proposes an open-source software for modeling and analysis of large-scale power networks based on dq0 signals. The dynamic models describing the network are provided as state-space objects that are sparse and of minimal order. The software supports integration of various models of synchronous machines,...
In this paper, a hybrid measurement and model-based method is proposed which can estimate the dynamic state Jacobian matrix in near real-time. The proposed method is computationally efficient and robust to the variation of network topology. A numerical example is given to show that the proposed method is able to provide good estimation for the dynamic state Jacobian matrix and is superior to the model-based...
Increasing dynamics of electrical loads presents uncertainty and hence new challenges for power grid controls and optimization. In economic dispatch control (EDC) for minimizing generation cost, demand reporting by customers is a promising approach for managing the uncertainty, but it raises important privacy concerns. Adding random noise to aggregate queries of demand reports can provide differential...
With the development of renewable energy, many countries developed their projects in offshore islands, resulting in high penetration of renewable energy in those island systems. However, large renewable energy integration affects the original unit scheduling and system transient stability. When a contingency event occurs, such as a generator trip, the frequency stability would be reduced, even leading...
In this work we propose an adaptive cyber-enabled control scheme for transient stability of smart grids. Based on feedback linearization control theory, the proposed distributed scheme utilizes a distributed energy storage system (ESS) to modify the dynamics of the power system during transients. However, the controller's design parameter is adapted to the cyber state of the smart grid. Specifically,...
In this paper, a novel framework for dynamic event monitoring in smart grid with synchrophasor data is proposed. The fundamental principle is that the nonstationary signatures of any dynamic event in the system will be captured by the data set collected from the phase measurement units (PMUs). The framework is performed in three steps: 1) Energy function components construction by using PMU data....
The transient response of power grids to external disturbances influences their stable operation. This paper studies the effect of topology in linear time-invariant dynamics of different power grids. For a variety of objective functions, a unified framework based on H2 norm is presented to analyze the robustness to ambient fluctuations. Such objectives include loss reduction, weighted consensus of...
This paper proposes a Dynamic Regulation Market Mechanism (DRMM) that results in improved financial settlements for wholesale electricity markets. The DRMM dispatches control signals at the Tertiary Control (TC) level based on a co-optimization problem that jointly optimizes energy production and reserve capacity. At the Secondary Control (SC) level the DRMM dispatches control signals using an iterative...
With the development of renewable resources, large amounts of Distributed Generation (DG) units penetrated into distribution network. Instead of traditional passive PQ bus equivalence, DG characterized Active Distribution Network (ADN) need to be appropriate modeled as active components to represents its dynamic behaviors. Though existed ADN equivalent research considered the inverter-based DG units...
The energy structure is undergoing a very serious change with the connection of renewables from the distribution level. One of these important changes that will ensure the sustainability of energy is the successful implementation of the microgrids. It is very important how the microgrid structure can recover itself from a severe system faults and also how the microgrid structure can maintain the balance...
In this paper, the interaction between ac and dc grids is studied for two types of MMC control structures; conventional and non-conventional control structures. Linear analysis methods that are based mode shapes and participation factors are used to identify dynamic interaction in a hybrid ac-dc power system. The analysis uses as a test system a three terminal Modular Multilevel Converter (MMC) based...
The National Load Dispatch Centre of Electricity Viet Nam (EVNNLDC) and Siemens PTI investigated the stability of the electrical 500/220 kV transportation system of Viet Nam. The general scope of the investigations is to improve the stability of the Viet Nam power system and to give the EVNNLDC staff the capability to decide how to deal with expected stability challenges in the future, which are related...
Electromagnetic transient studies of large scale power system including FACTS and HVDC requires modeling of complicated transmission networks, at the same time modeling the details of complete system requires great amount of computer memory and computation time. The complete Indian power system network of northern, eastern, western, north-eastern and southern region consists of more than 1200 buses...
The dynamical economic dispatch problem is studied and reformulated by a distributed interior point method via a logarithmic barrier. By the facilitation of the graph Laplacian, a fully distributed primal-dual dynamical multiagent system is developed in a smart grid scenario to seek the saddle point of dynamical economic dispatch which coincides with the optimal solution. Specifically, to avoid high...
Results of a nonlinear simulation is used in this paper to identify a linear model of a black-boxed synchronous machine. Linear system identification methods such as Prony Analysis, are employed to identify linear models of power system devices when their complete mathematical models are not available to be included in small signal stability studies. While the user lacks the knowledge of the control...
In this paper, a new three input ports generation system with open-winding generator for wind/solar hybrid generation system is proposed. By using an open-winding topology can save a set of full-controlled power electronic device, which simplifies the structure and increases the system reliability. In order to maintain the generating efficiency of PM generator, d axis current is set to zero, battery...
This paper focuses on the assessment of power systems dynamic stability, considering the example of the Blackout that occurred in Tunisia in 2014. The fault that caused the blackout is a short circuit that occurred on 31 August 2014. This work is a simulation of this fault using PSS/E Program with an assessment of the dynamic stability of the Tunisian power system. The work also addresses the importance...
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