Active power filter(APF) is a typical hybrid dynamic system. And the accuracy of its model directly affects the understanding of the movement laws and the design performance of the controller. According to hybrid auto...
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Active power filter(APF) is a typical hybrid dynamic system. And the accuracy of its model directly affects the understanding of the movement laws and the design performance of the controller. According to hybrid automata modeling theory, partition of the state space in single-phase shunt APF movement is analyzed in this paper. Then the hybrid automaton model is established. The model can accurately reflect dynamical motion characteristics of the single-phase shunt APF. Simulation results illustrate the effectiveness and validity of the proposed mode.
The problem of determining the Hopf bifurcation point in an autonomous nonlinear system with bifurcation parameters is converted into solve a set of nonlinear algebraic equations, which can be constructed by a semi-an...
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The problem of determining the Hopf bifurcation point in an autonomous nonlinear system with bifurcation parameters is converted into solve a set of nonlinear algebraic equations, which can be constructed by a semi-analytical method and solved by an iterative numerical algorithm as proposed, according to the necessary and sufficient conditions for existing of Hopf bifurcation. First of all, the eigen-polynomial of Jacobian matrix of the system can be decomposed into product of two parts under the condition for existing of Hopf bifurcation. And then, the coefficients of the eigen-polynomial can be decided though the semi-analytical method by using the relations of the coefficients and the elements of Jacobian matrix, and deducing the conditions which should be decided by the coefficients at Hopf bifurcation point. The nonlinear equation set is constructed through the above condition and the one that Hopf bifurcation point must be the balance point of the system. The nonlinear equation set is constructed through the above condition and the one that Hopf bifurcation point must be the balance point of the system. And last, the nonlinear equation set is solved by using Newton2 Raphson iterative method. The proposed method can determine both Hopf bifurcation point and the pure imaginary eigenvalue pair of the Jacobin matrix of the system at the same time, thus avoiding the shortcoming for repeatedly solving the eigenvalue problems for every change of the chosen parameters as in some other existing methods. The proposed method is feasible and effective which is illustrated in General Electric Power systems.
In this paper, a new hyper-chaotic system is generated by introducing a state variable into Chen system. This system contains five system parameters and two cross- product terms, can generate hyper-chaotic attractors ...
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In this paper, a new hyper-chaotic system is generated by introducing a state variable into Chen system. This system contains five system parameters and two cross- product terms, can generate hyper-chaotic attractors with proper parameters regions. The theoretical analysis demonstrates that a Hopf bifurcation arises at zero equilibrium point. The basic dynamic properties of the proposed system are investigated via Lyapunov exponents spectrum and bifurcation diagram. Finally, the hyper-chaotic circuit is designed and realized by using the Multisim software, which confirms that the proposed system can be achieved.
It's introduced domestic and overseas current development of Static Synchronous Compensator, and analyzed principle of STATCOM, and combining lots of information, respectively summarized the control technique of S...
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ISBN:
(纸本)9781612844589
It's introduced domestic and overseas current development of Static Synchronous Compensator, and analyzed principle of STATCOM, and combining lots of information, respectively summarized the control technique of STATCOM based on control mode and control tactics.
In the practical application process of active disturbance rejection control technique, it is difficult for parameter tuning with too many parameters, different control objects and the direction and size of tuning ran...
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In the practical application process of active disturbance rejection control technique, it is difficult for parameter tuning with too many parameters, different control objects and the direction and size of tuning range unknown. In this paper, through the actual simulation and analysis, some rules on parameter tuning of active disturbance rejection control(ADRC) will be given, which has a greater significance for the practical application of ADRC.
Based on finite element analysis software ANSYS, a company warehouse properties of door type steel frame structure has been studied under the action of fire. Taking the whole structure as research object, the paper us...
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Based on finite element analysis software ANSYS, a company warehouse properties of door type steel frame structure has been studied under the action of fire. Taking the whole structure as research object, the paper used beam element and shell element to simulate the column, prime beam, second beam and concrete slab in the structure respectively. When linking the slab and the beam by beam connection and linking the column and the beam by pin connection at the same time, the influences of the whole structure have been considered based on different areas affected by fire. The results of analysis draw three conclusions. Firstly, large-span and strong constraints beam of structure and column-beam joint are the adverse regions affected by fire. Secondly, the column which bears multiple components is the weak link of steel structure. Finally, it is the temperature gradient in the direction of slab thickness that plays a crucial role in the ability of the overall fire resistance of steel structure.
The working principle of the mechanical feed system of Φ630 automatic pipe chamfering machine is introduced in this paper, and the working state of the feed system is analyzed in order to provide a theoretical basis ...
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The working principle of the mechanical feed system of Φ630 automatic pipe chamfering machine is introduced in this paper, and the working state of the feed system is analyzed in order to provide a theoretical basis for the servo control of feed system. The detection principle of the feed system and the detection method of the feed speed and displacement are also emphasized, and the calculating formula of the electronic gear ratio is presented to offer theoretical reference for equipment site commissioning.
Motor Schema-based formation controlsystem is chosen to be the main research direction. Five sub-behaviors called move-to-goal, avoidobstacle, swirl, noise and keep-formation are introduced for the line formation con...
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Motor Schema-based formation controlsystem is chosen to be the main research direction. Five sub-behaviors called move-to-goal, avoidobstacle, swirl, noise and keep-formation are introduced for the line formation control mission. Using Teambots simulation system, the line formation is simulated. Neighbor-referenced method for formation position determination has been adopted. Aiming at the line formation, single-neighbor-referenced and double-neighbor-referenced methods are used. The simulations experiments data indicate that double-neighbor-referenced method reduces the running time, improves performance and achieve stability.
In order to improve the capability of the fault diagnosis, this paper introduces the Decision Directed Acyclic Graph(DDAG) algorithm and establishes a new detection and diagnosis system combing the DDAG with the Kerne...
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In order to improve the capability of the fault diagnosis, this paper introduces the Decision Directed Acyclic Graph(DDAG) algorithm and establishes a new detection and diagnosis system combing the DDAG with the Kernel Principal Component Analyses(KPCA) method. The hybrid system uses KPCA and DDAG to detect and identify the fault. A specific description of the principles and procedures about how to use KPCA method and DDAG is given. The new detection and diagnosis system has an excellent performance in the fault detection and diagnosis of the Tennessee-Eastman(TE) process. This paper gives a new way to research the fault detection and diagnosis in industrial nonlinear system.
Image feature matching in three-dimensional information acquisition technology is an important aspect of machine vision, in order to achieve the real-time and matching robustness requirement, an image registration...
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Image feature matching in three-dimensional information acquisition technology is an important aspect of machine vision, in order to achieve the real-time and matching robustness requirement, an image registration method based on SURF algorithm is proposed. First construct Hessian matrix based on box-type filter, use SURF algorithm to calculate the information of feature points, then decompose characteristics of feature points and match feature points. Experimental results show that the matching speed of SURF algorithm is 4 times as fast as the SIFT algorithm, greatly improves the real-time and robustness.
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