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In this paper, three different Wide-Area Damping Control design methods are considered for a two-level control scheme. The important challenges involved in this control design are output-feedback, communication time-delays, loss of remote signals and multivariable control design. Three different control design methods, found in the literature, are analyzed: Riccati equation solution, Linear Matrix...
With high-penetration levels of renewable generating sources being integrated into the existing electric power grid, conventional generators are being replaced and grid inertial response is deteriorating. This technical challenge is more severe with photovoltaic (PV) generation than with wind generation because PV generation systems cannot provide inertial response unless special countermeasures are...
This paper proposes an approach for estimating dynamic equivalents retaining the oscillatory modes through an optimal formulation. This approach defines equivalent generators for representing an external area while preserves the study area. The optimal formulation estimates the corresponding parameters of the equivalent generators, minimizing the difference between the main inter-area modes for the...
This paper studies the impact of wind generation on generator rotor angle and inter-area oscillation stability. A comparative simulation study is conducted based on a U.S. Eastern Interconnection (EI) planning model for year 2030. The wind penetration level is 17% of the total generation. Generator critical clearing time (CCT) and inter-area oscillation damping ratio are evaluated. It is observed...
In this work we study the impacts of Denial-of-Service (DoS) attacks on the cyber-physical implementation of wide-area control. The controller is desgined as a Linear Quadratic Regulator (LQR) for damping power flow oscillations. We first derive a nominal mathematical model of the power system network considering a delay-aware LQR controller without any DoS. Thereafter, we model how DoS enters the...
This paper studies the problem of optimal frequency regulation in power networks, represented by a nonlinear structure preserving model, including turbine-governor dynamics. Exploiting an incremental passivity property of the power network, distributed controllers are proposed that regulate the frequency and minimize generation costs, requiring only frequency measurements.
Using the pseudo-generalized Hamiltonian method, this paper investigates the decentralized nonlinear robust coordinated control of multiple static synchronous compensators (STATCOMs) in multi-machine multiload power systems. First, the uncertain nonlinear differential algebraic equation model is constructed for the power system. Then, the dissipative pseudo-generalized Hamiltonian realization of the...
The relevance of the research is caused by the fact that more than two thirds of territories in Russia do not have centralized power supply. There are small isolated power systems consisting of several loads ranging from 1 to 15 MW. Unfortunately, the share of small power plants in the world does not exceed 25%. Another part is large gas turbine generators with powers over 20 MW. One of the reasons...
The paper reveals that while the equivalent circuit, representing the load side reflected low-frequency dynamics of a wind turbine generator, is similar to the electrical equivalent circuit of a photovoltaic generator, their dynamic resistances possess different behavior. While the incremental conductance of a photovoltaic generator does not change sign with terminal voltage variations, zero-crossing...
In this paper a new approach to parametric change detection and failure diagnosis for interconnected power units is proposed. The method is based on a new nonlinear filtering scheme under the name Derivative-free nonlinear Kalman Filter and on statistical processing of the obtained state estimates, according to the properties of the x2 distribution. To apply this fault diagnosis method, first it is...
This paper presents a comprehensive modelling approach to obtain a small-signal model of a Modular Multilevel Converter (MMC)-based High Voltage Direct Current (HVDC) link interfacing two large asynchronous ac systems. Detailed models are used to represent synchronous generators, MMC converters and their controllers. Time-domain simulations of the non-linear model are presented to test the performance...
Power System stability is an essential study in the planning and operation of an efficient, economic, reliable and secure electric power system because it encompasses all the facet of power systems operations, from planning, to conceptual design stages of the project as well as during the systems operating life span. This paper presents different scenario of power system stability studies on a modified...
Stability of complex electrical power systems (EPS) is an important technical property, indicator of reliable and efficient operation of the EPS. The concept of stability can be divided into three types: the static, dynamic and resulting one. Static stability is the ability of the system to restore normal operation after minor perturbations, in its turn, dynamic and resulting stability is the ability...
This paper attempts to show how a fuzzy logic controller (FLC) is used for the design of a power system stabilizer (PSS) for a multi-machine interconnected power system. It has also been addressed how a fuzzy logic-PSS has been optimized by using an adaptive neuro-fuzzy inference system (ANFIS) based technique. The design objective of the PSS is to supply an external damping torque to an automatic...
Power system monitoring and control relies on the result of dynamic state estimation. Installation of PMU in power grids in recent years makes it possible to study the dynamic properties of power system. However it's hard to replace PMU on all buses with the conventional measurement of SCADA system in near future and there are lots of traditional measurements of SCADA system. Therefore, it is reasonable...
Transient stability-constrained optimal power flow (TSC-OPF) aims at optimising the scheduling of generation with stability constraints to ensure a secure system in the event of contingencies. This paper proposes a new approach based on a critical clearing time (CCT) constraint that replaces the dynamic and transient stability constraints of the TSC-OPF problem. The CCT is computed by a multilayer...
Many electric power utilities, such as Hydro-Quebec, are capacity limited despite having enormous energy surpluses. When demand and supply fluctuate, frequency control guaranties that the nominal network frequency remains constant. Frequency control can be applied on generation as well as demand side. This paper investigates the application of optimal demand side frequency based load control (OLC)...
Excitation control is one of the most effective means to improve the dynamic performance of power systems. This paper investigate the switched excitation control of power systems with generator tripping operation under emergency. First, we discuss the dynamics of the generators under different operating conditions and put forward a switched power system model. Then, the switched dynamic model is transformed...
In this paper, multi area multi objective dynamic economic dispatch (MAMODED) with optimal real power dispatch in dynamic areas is considered. More accurate cubic cost function models thermal and emissions functions. The five-objective MAMODED includes thermal, renewable, tie line losses and emissions plus all the possible constraints. Uncertainties and variability of renewable energy (RE) sources...
In this paper, a preventive control method against transient instabilities due to a set of critical contingencies that could occur in a large power system is proposed. The generation rescheduling, adopted as the preventive control, is based on the coherency between the generators. The rescheduling is done by attempting to bring the generators’ rotor speeds equal after a three phase fault that might...
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