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Demand response (DR) has proved to be an inevitable part of the future grid. Much research works have been reported in the literature on the benefits and implementation of DR. However, little works have been reported on the impacts of DR on dynamic performance of power systems, specifically on the load frequency control (LFC) problem. This paper makes an attempt to fill this gap by introducing a DR...
One of the challenges in future energy systems is the massive use of high power converters that decouple new energy sources from the AC power grid, disabling natural frequency response. This situation decreases the total system inertia affecting the ability of power system to overcome system frequency's disturbances. It has been established by the wind power industry a controller to enable inertial...
This paper presents the Hardware in the Loop (HiL) validation of a control method to regulate the voltage of the DC Bus fed by Distributed Generation (DG) units in an islanded MVDC microgrid. The disturbance based control, employs a decentralized Linear Quadratic Gaussian (LQG) control of individual generator side converters to be executed locally, and which does not need remote measurements of loads...
In this paper, a trajectory sensitivity method (TSM) is used to estimate parameters of a synchronous generator model suitable for unbalanced conditions which are typical of distribution systems. The current formulation and mechanical equations which represent the synchronous machine have parameters whose value modification cause significant changes in system's output. Trajectory sensitivity method...
Cascading outages in transmission power systems leading to blackouts or major power disruption are due to complex mechanisms. Some of the key mechanisms are intrinsically linked to power system dynamics that static models cannot represent. Additionally, stochastic failures of the protection devices are another important factor. Therefore, a dynamic probabilistic risk assessment of cascading outages...
In this paper, we present a homotopy based numerical continuation algorithm to efficiently compute all feasible equilibria of a complex power system model. The dynamic characteristics of conventional power systems are undergoing a sea change due to the impact of large-scale integration of renewables, storage elements, new type of loads etc. Several parameters of these components affect the power system...
This paper presents a new methodology for long-term transmission planning over large systems. The developed approach aims at finding the optimal design of a large grid including its modular development plan over a long time horizon. Advanced optimization and simulation methods have been investigated to tackle this very large and complex problem, which includes highly combinatorial aspects and stochastic...
This paper develops a test bed based on the Northeastern Power Coordinating Council (NPCC) 48-machine, 140-bus power system model for simulating cascading failures. Then, the paper uses the test bed to demonstrate the interaction model recently proposed by [1] for analyzing cascading failures, identifying key linkages between component failures, and predict propagation of failures. For the NPCC test...
In a planning stability study focusing on a specific wind power plant (WPP), it is dispatched at full output. Its dynamic response is not expected to be noticeably affected by the loading of WPPs in close electrical proximity. To investigate the validity of this approach and better understand the mutual effect of the loading levels of nearby WPPs on their dynamic responses to power system faults,...
Electrical Power Systems are constantly exposed to various disturbances that can significantly affect their operation. Hence, the Automatic Under Frequency Load Shedding philosophy was proposed in order to relieve overloaded infrastructures in cases of imbalances between generation and demand. However, determining the various parameters that compose a conventional load shedding scheme is not a deterministic...
Due to security and liability concerns, the research community has limited access to realistic large-scale power grid models to test and validate new operation and control methodologies. It is also difficult for industry to evaluate the relative value of competing new tools without a common platform for comparison. This paper proposes to develop a large-scale virtual power grid model that retains...
Photovoltaic (PV) power is an environmentally friendly source of energy, which is quite convenient for integration into distribution systems in form of rooftop PV units. However, a high penetration level of PV units is needed to supply required energy for a considerable part of system loads. The impact of this high PV power penetration on the system stability needs to be assessed. Considering the...
This paper evaluates the effectiveness of reactive reserves provided by distributed energy resources to increase the loadability of a weak area of the Hellenic Interconnected System. The effect of static capacitor switching is compared to reactive support provided by electronic converters at the same substations. The investigation has been focused on a specific potentially unstable contingency of...
This paper proposes a robust control scheme to improve the integration of variable energy sources such as renewables into a DC bus distribution microgrid. The model of the controller is developed and analyzed with simplification of parameters and keeping the effect of the multiple loads and sources connected in parallel as an uncertainty. Various simulated scenarios are used to show the performance...
Analytic methods to quantify power systems stability margins while acknowledging uncertainty will be critical in dynamic security assessment due to the integration of renewable resources and uncontrollable loads. Lyapunov's direct method provides a mathematical framework to assess stability margins. However, analytical construction of Lyapunov functions are limited to very restrictive settings and...
A reliable and economic/environmental smart grid (SG) has been a major focus area for modern power system design, which is threatened by the renewable resource penetration and load fluctuation. This paper presents a reliable and economic load frequency control (LFC) strategy based on model predictive control (MPC) to allocate active power set points for different generators by considering units' economic...
This paper presents some results of our ongoing research on the dynamic performance of the Vietnam power system. The study involves simulations of N−1 events in the 500–220kV transmission system, especially the loss of an 500kV circuit, which in reality has caused a large scale blackout in the Southern grid of Vietnam, in May 2013. The simulations reveal some interesting results, regarding the operation...
The Icelandic power network has transmission constraints that often lead to inter-area oscillations. Although conventional stabilization methods have been applied successfully in the past, there is potential to exploit large industrial loads to enhance system stability during stringent operation conditions. This paper analyzes the performance of two damping controllers. The controllers can use both...
Newer dynamic load models are being developed in industry through field-tests, to better represent the actual system response. Some of these models are quite complex, and include feeders, distribution transformers and various types of static and dynamic loads, thus resulting in more than a hundred parameters per model. This paper presents a methodology on how such complex dynamic load models in commercial...
To assess static voltage stability in power networks, critical load values were examined at each load bus as a voltage instability predictor. However, the information that is required to evaluate loadability conditions is usually not available at load buses. To predict impending voltage collapse in a droop-controlled power distribution network, this paper introduces a static voltage stability detector...
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