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Voltage instability has been a cause of several recent major power outages worldwide. This paper presents a successive mixed integer programming (MIP) based method of reactive power control planning to increase voltage stability margin under a set of contingencies. The backward/forward search algorithm and voltage stability margin sensitivities are used to select candidate locations for switched shunt...
As energy crisis poses a huge threat to human welfare, the electric vehicle is of vast potential for future development as an newly emerged traffic tool which is energy-conserving and environment-protective. However, the layout method of its charging station is far from a mature system even though the construction is being undertaken. Thus this paper presents a multi-objective planning model which...
Smart Grid is aimed to incorporate monitoring, analysis, control and communication capabilities to improve reliability and energy efficiency. However, currently there is no enough sensor to provide information interface for the implementation of smart grid. Therefore, new types of sensors should be deployed to assist the implementation of smart grid. This paper proposes a novel scheme, in which new...
Voltage vulnerability has been important in power system security research. Considering the characteristic that the voltage are mainly influenced by the reactive power, the potential energy margin which can embody the impacts from the reactive load, the reactive output of generator, the reactive compensation, and so on, was proposed as the benchmark, and then, the degree index and the trend index...
Icing on overhead power transmission line is a serious problem that affects the secure operation of power system. This paper firstly analyses transmission line icing damage and the advantage & disadvantage of various current online monitoring techniques. Then, the implementation scheme of a novel method, which based on the sensor network of fiber optic sensor, is introduced. Through measuring...
The problem of diagnosing the actuator faults and sensor faults of linear system with the methods of fault detection and isolation (FDI) technology and optimal fault-tolerant observers is addressed. The measurable outputs used to reconstruct states for the system carry the fault information, which may affect the performance of the system state estimation. In this paper, by comparing the measurable...
In order to create natural eye movement and expression, a novel approach was presented. In this method, for a smooth effect, the 3D grid region of the eyelids was divided into two parts: the boundary points and the non-boundary points. The boundary points are controlled by Oscillating Guard Bar Mechanism, which affect the non-boundary points by RBF (radial basis function) deformation. Besides, other...
In this paper, in terms of pairwise constraints which specify whether a pair of instances belong to the same class (must-link constraints) or different classes (cannot-link constraints), we propose a novel semi-supervised discriminant analysis algorithm which integrates both global and local structures. Specifically, our objective is to learn a smooth as well as discriminative subspace. In order to...
This paper focuses on that the surface wave on the patch antenna has great effects on its performance in electronic toll collection (ETC) system. The surface wave reduction condition for the circle patch antenna is studied. A cored circle patch antenna operated at 5.8 GHz is presented to remarkably reduce the surface wave, but these did not significantly reduce the efficiency or usefulness of the...
Traditionally, human expression database was built by recording the real actor's face. The disadvantage of this expressions are lack of spontaneity. In this paper, to alleviate this problem, we present a newly developed expression database which is constructed in two aspects. Based on our database, we proposed a new algorithm to synthesize the facial expression animation. And the experimental results...
Gossip-based protocols are increasingly popular in large-scale distributed applications that disseminate updates to replicated or cached content. GO (gossip objects) is a pernode gossip platform that we developed in support of this class of protocols. In addition to making it easy to develop new gossip protocols and applications, GO allows nodes to join multiple gossip groups without losing the appealing...
A new directly manipulated algorithm of rigid body displacement constrained deformation, abbreviated as RBDCD, is proposed in this paper. It's based on the idea of freeform deformation (FFD), but replaces the concept of "free-form" by introducing the rigid body displacement as constraints to adapt to industrial requirements. RBDCD also omits the general process of parameterization in traditional...
This paper attempts to obtain insight about the effect of modal interaction of higher than 2nd order in small-signal analysis, through evaluating the effect of 3rd order modal interaction. The indices that quantify the 3rd order modal interaction are defined, following the modal analysis procedures used in linear modal analysis and second order modal analysis. Numerical simulation results demonstrates...
This paper reports part of the results in the project to develop an on-load de-icing system. In the system, a high frequency high voltage excitation with adjustable frequency, is used to de-ice the ice covered on long power transmission line. The system is highly efficient in de-icing due to the joint heating effect brought by transmission line loss and dielectric loss. The mathematical model of the...
The analysis of higher order modal interaction attracts much attention from scholars all over the world. The normal form theory and the modal series method offer new ideas for solving these problems. However, literature review and simulation show that modal analysis for a certain case with these approaches may obtain different results. In this paper, the currently available methods are integrated...
According to the integral theory of energy function, branch potential energy function model is constructed, and then two indexes are proposed: one is the current vulnerability, which quantifies the distance between the current transmitted power and initial transmitted power to identify the current vulnerable area, the other is the forecasting vulnerability, which is gained through computing the branch...
Chaotic Immune evolutionary algorithm (CIEA) is proposed on the shortage of current algorithms training artificial neural network, biological immune mechanism and the characteristics of evolution. A novel artificial neural network based on chaotic immune evolutionary algorithm (CIEANN) is presented in this paper. The algorithm has the merits of chaos, immunity and evolutionary algorithm. It can ensure...
Peers in multiple P2P applications execute overlapped operations with different implementation, like neighbour management, resource publish/lookup, delay investigation, which leads to poor interoperability and unnecessary network load. Peers contribute their resources only when they stay in same application. We propose a P2P middleware, called Ripple, to accomplish common functions in a layered architecture...
In the existing data fetching algorithms for P2P streaming systems, the peers usually fetch data independently, leading to huge inter-AS traffic (AS: autonomous system). This paper proposes CoFetch, a collaborative fetching algorithm for P2P live streaming systems to decrease inter-AS traffic. In CoFetch, to avoid that all peers fetch the same data from inter-AS connection, instead of aggressively...
In P2P live streaming system, service will be degraded when thousands of semi-riders, peers with very limited outbound bandwidth, concurrently join. Due to the limited outbound bandwidth, a semi-rider peer always gets more data than its contributions. In this paper, we propose VolunteerLive, an incentive-based P2P live streaming model, to address this issue. In VolunteerLive, these asymmetrical users...
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