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This paper develops a robust extended Kalman filter to estimate the rotor angles and the rotor speeds of synchronous generators of a multimachine power system. Using a batch-mode regression form, the filter processes together predicted state vector and PMU measurements to track the system dynamics faster than the standard extended Kalman filter. Our proposed filter is based on a robust GM-estimator...
This paper presents an energy core-ness based analysis of hybrid distributed energy systems to identify the most important or core nodes in the system. The proposed energy core-ness based analysis is used to compute a one-to-one relation between generation sources, storage nodes and loads, regardless of their distributed location in the system. Results indicate that the proposed energy core-ness analysis...
Wind generation is traditionally treated as a non-dispatchable resource and is fully absorbed unless there are security issues. To tackle the operational reliability issues caused by the volatile and non-dispatchable wind generation, many dispatch frameworks have been proposed, including robust unit commitment (RUC) considering wind variation. One of the drawbacks that commonly exist in those dispatch...
In this study, a robust fault reconstruction approach is proposed for the 4.8 MW wind turbine benchmark system. Firstly, through weighted combination of a number of locally valid linear systems, the nonlinear wind turbine model is well represented by a Takagi-Sugeno fuzzy model. Then, augmented system approach jointly with unknown input fuzzy observer technique are utilized to estimate faults and...
This paper investigates the fault detection problem of quantized feedback systems with actuator faults, and system outputs are respectively quantized by a uniform quantizer and a non-uniform quantizer. A new method is proposed to deal with quantization errors, that is, the quantization errors are considered as the unknown inputs of the residual generator. In order to detect the faults, an optimal...
This paper presents a nonlinear internal model construction method by introducing certain coined Luenberger observer-like trial samples and further using Lyapunov's auxiliary theorem for confirmation. Specifically, it comes up with several novel types of parameterized nonlinear internal models with certain output in a constructive fashion, distinguishing themselves from existing ones proposed in the...
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...
In order to make wind power generation truly cost-effective and reliable, an advanced control technique must be used. This paper presents the development of a control strategy based on the rotor current loop using the Generalized Predictive Control (GPC) approach applied to a Doubly-Fed Induction Generator (DFIG)-based wind turbine. The controller is designed to minimize oscillations in the generator...
This paper introduces event-based control as a means to improve the behaviour of feedback loops with switching controllers. It investigates hybrid event-based control systems where the event-based part of the controller affects a continuous control loop. Its task is to adjust the operating point of this control loop to changing operation modes of the overall system. The paper introduces a control...
This article presents an accurate study about the validity of the tuning rule for symmetric-send-on-delta (SSOD) based PID controllers which was presented by the authors in a previous work. First we obtain the conditions under which the rule is valid and then we study its fulfillment for an extensive batch of 134 models. The results demonstrated that most of the models used in practical applications...
This paper describes a basic idea of a multilevel multiphase Energy Generation Systems (EGS) that display an interesting feature of increased robustness on contrary to their 3-phase counterparts. It is achieved mainly due to utilization of multiphase generator that is inherently able to work under open-phase failure without any fault-tolerant algorithm. Unfortunately, one phase lost in the generator...
Complex computational systems can experience undetected faults that produce incorrect outputs. However, error measures can be adopted to quantify these incorrect results and evaluate computational robustness. This paper offers an approach to assessing the worst case scalable robustness (WCSR) of an algorithm paired with an error measure, as well as the i.i.d. average case scalable robustness (ACSRiid)...
Compressed sensing, further to its ability of reducing resources spent in signal acquisition, may be seen as an implicit private-key encryption scheme. The level of achievable secrecy has been analyzed in the most classical settings, when the sensing matrix is made of independent and identically distributed entries. Yet, it is known that substantially improved acquisition can be achieved by tuning...
As renewable energy plants are becoming more widely accessible, one trend of power grids' evolution is decentralization which poses many challenges for grid management. In this paper, we propose a generator allocation method, based on community structure detection, for placing decentralized generators. We take node-generator distance (DG) as an indicator of optimal generators' locations and the underlying...
In view of the pitch blade servo system failure of wind turbine, this paper introduces the generate form of generating residual error and the fundamental principles of disturbance decoupling in the model-based fault diagnosis methods. Designing an observer-based fault diagnosis device. Under the premise of the assumption that the distribution of interfere is known, for the model uncertainty problems...
As a strong supplement of bulk power system, microgrid has become an important part of smart grid and has wide prospects in residential application. The increasing penetration of renewable energy and electric vehicles has bring numerous challenges to the stability of microgrid system. The stable and economic dispatch strategy plays a major role in the operation of such a distributed power system....
Uncertainty in wind power generation poses significant challenges to the operation of power systems. To tackle these challenges, a robust unit commitment model minimizing the fuel cost of conventional generators in coordination of the pumped storage plants is established to accommodate stochastic wind power. Wind power output is defined by uncertainty set which contains the worst-case scenario of...
In this paper, a robust controller is designed for the load frequency control (LFC) system in an islanded microgrid with multiple synchronous generation systems. This control strategy can be readily applied to an islanded microgrid which consists of renewable distributed generation and energy storage systems. The robust controller proposed in this paper includes multiple local controllers that are...
This paper deals with residual generator construction and fault detection system design issues based on a hybrid framework. The connection between the parity vectors and diagnostic observers is presented in details. In comparison with existing approaches, the proposed algorithm improves the computational efficiency and therefore the real-time implementation capacity of residual generation. A direct...
Inter-area oscillations are frequently observed in a multi-area power system; these oscillations are impacted by different contingencies and operating conditions, and occur with multiple modes. As a result, the consideration of robustness is essential during the design of damping controllers. In order to simultaneously satisfy the requirement of Robust Stability (RS) and Robust Performance (RP) for...
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