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Hyperbolic function sliding-mode control-based chaotic oscillation suppression method of power system

A technology of power system and hyperbolic function, applied in the direction of reducing/preventing power oscillation, circuit device, AC network circuit, etc., can solve problems such as chattering problems, and achieve the effect of fast chaotic oscillation phenomenon

Active Publication Date: 2017-05-17
XIAN UNIV OF TECH
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Problems solved by technology

[0004] Sliding mode control has been applied to the control of chaotic oscillations in power systems. The advantage of sliding mode control is that it can overcome the uncertainty of the system and has strong robustness to disturbances and unmodeled dynamics. The disadvantage of this control is that its control chattering problems during

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  • Hyperbolic function sliding-mode control-based chaotic oscillation suppression method of power system
  • Hyperbolic function sliding-mode control-based chaotic oscillation suppression method of power system
  • Hyperbolic function sliding-mode control-based chaotic oscillation suppression method of power system

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Embodiment

[0083] Step 1: Let a=1, b=0.02, c in the system model 1 =0.2, F=0.2593, the system appears chaotic oscillation, image 3 and Figure 4 They are the timing diagrams of the relative electrical angle δ and the relative rotor angular velocity ω when chaotic oscillation occurs, respectively. From the simulation graph, it can be seen that the system has random oscillations in the generator rotor operating angle and relative speed under this set of parameter conditions. At this time, the interconnected system is in a state of chaotic oscillation.

[0084] Step 2: Add a hyperbolic sliding mode controller module to the chaotic oscillation of the interconnected dual-machine system, and make the tracking target x d =sint, hyperbolic sliding mode controller parameters are set as follows: c=25,D 1 =2, η=20, ε=0.02.

[0085] Step 3: The controller output is generated by the joint action of the target signal of the relative rotor angle of the two machines, the model parameters and the co...

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Abstract

The invention discloses a hyperbolic function sliding-mode control-based chaotic oscillation suppression method of a power system. The chaotic oscillation suppression method is implemented according to the following steps of 1, calculating a relative error e(t) according to a relative rotor angle actual value x<1>(t) and a relative rotor angular speed ideal value x<d>(t) of a second-order interconnection dual-motor power system; 2, setting a sliding-mode controller parameter; 3, calculating a motion state of a system sliding-mode surface according to the relative error e(t) and the sliding-mode controller parameter; and 4, generating a controller output u(t) by joint efforts of the sliding-mode controller parameter and a motion state equation, making the controller output acted on a rotor of a power generator, outputting the current relative rotor angle actual value x<1>(t), forwarding to the step 1, and adjusting the controller output according to the relative error. According to the hyperbolic function sliding-mode control-based chaotic oscillation suppression method of the power system, a chaotic oscillation phenomenon generated in the interconnection dual-motor power system is rapidly and effectively suppressed by the sliding-mode controller of a hyperbolic tangent function.

Description

technical field [0001] The invention belongs to the technical field of suppressing chaotic oscillation of an interconnected power grid, and in particular relates to a method for suppressing chaotic oscillation of a power system based on hyperbolic function sliding mode control. Background technique [0002] Chaotic oscillation is a very complex phenomenon caused by the interaction of various parameters in nonlinear systems. In recent years, people have not only observed many chaotic phenomena in the laboratory, but also recognized the conditions and characteristics of chaos. When it occurs, the system will continue to oscillate irregularly with the change of operating parameters, which may lead to system instability and seriously endanger the safe operation of the system. [0003] The control method of power system chaos is divided into two aspects: guiding the development of chaotic oscillation to the expected track and suppressing the occurrence of system chaos. At present...

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Application Information

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IPC IPC(8): H02J3/24
CPCH02J3/24H02J2203/20
Inventor 朱大锐张文超段建东
Owner XIAN UNIV OF TECH
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