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The negative interaction between AC and DC voltage controls of the static synchronous compensator (STATCOM) has attracted much attention, and new control models and strategies need to be developed. This paper proposes a new solution based on differential game theory to solve the negative interaction problem between AC voltage controller and DC voltage controller in the STATCOM. The types of differential...
Cold roll forming (CRF) is an important sheet metal forming process that is widely studied through experiments and numerical simulations. Mathematical analysis is a more efficient and economical tool to examine CRF, but little attention has been given to it for a long time. In this study, a new mathematical model is developed to analyze the bend angle distribution and longitudinal strain development...
Nowadays social networks have been dominating the life of majority young people. To enhance internal communication, companies also start to use social networks to communicate inside with their staffs. Yet the answers to what motivates people to participate in social networks still remain vague. Thus, this empirical study within China Mobile Beijing area is aimed to find out what motivation factors...
Conventional fault analysis algorithms may not be suitable for the AC/DC hybrid systems. To solve this problem, a mathematical model for HVDC (High Voltage Direct Current) system, which is suitable for analyzing faults in AC system, is presented in this paper. Firstly, based on the switching functions method and sequence components method, an equivalent model of HVDC converter under the asymmetric...
Based on the basic voltage and flux equations of the Doubly Fed Induction Generator, this paper derived expressions of short-circuit current of wind turbines, which are expressed by transient equations of stator and rotor flux. The transient equations of stator and rotor flux were functions of initial values of stator and rotor flux and transient time constants of stator and rotor windings. The initial...
Research and utilization of quadrotor helicopter in many areas is increasing because of its special flight performance. It is not easy to control a quadrotor whose dynamic characteristics are nonlinear, multivariable and stronglycoupled. A novel method is proposed to solve this problem, which adopts a MIMO RBF-ARX model to represent the nonlinear dynamics of quadrotor, and then based on a locally...
Aircraft simulation platform is the most important supporting technology in the aircraft development process. This simulation platform can be used for validating the design of subsystem and also it provides the necessary data for the Aircraft design. Wind has great impact on the flight parameter. In order to accurately simulate the wind model and calculate the flight parameters, a simulation modeling...
Variogram as an important mathematical model of Kriging can effectively describe the features of the variants in some districts of ore deposit. This paper presents a isoline drawing method which uses genetic algorithm (GA) to estimate the Kriging variogram parameters. This method called GA-based Kriging was compared to ordinary Kriging. The isolines interpolated by GA-based Kriging are of higher precision...
The paper presents a new phase coordinate algorithm for analysis faulted AC double-circuit lines. Different topologies of double-circuit lines are considered. Different types of short circuit faults, inter-circuit faults and open conductor faults are treated in a general fault conditions. The development of the algorithm is based on the matrix transformation and port network theory in phase coordinates...
The conventional symmetrical components fault analysis method may not be practically feasible in case of the analysis of simultaneous faults, especially in inherently unbalanced power systems because of the difficulties encountered in the assembly of sequence networks and their solution. To alleviate these problems, this paper presents a new algorithm for computer which is suitable for analyzing arbitrary...
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