Fractional order modeling method of three-phase voltage type PWM rectifier
A technology of three-phase voltage and modeling method, which is applied in the direction of electrical components, output power conversion devices, AC power input conversion to DC power output, etc. It can solve the problems of not considering the fractional order characteristics of inductance and capacitance, and the model is not accurate enough.
Active Publication Date: 2019-11-08
GUANGXI UNIV
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[0005] In order to solve the problem that the traditional three-phase voltage-type PWM rectifier modeling method does not consider the fractional-order characteristics of inductors and capacitors, and the model is not accurate enough, the present invention provides a fractional-order modeling method for three-phase voltage-type PWM rectifiers. The specific technology The scheme is as follows:
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[0084] In order to better understand the present invention, the present invention will be further described below in conjunction with accompanying drawing and specific embodiment:
[0085] figure 1 It is the topological structure diagram of the main circuit of the three-phase voltage type PWM rectifier described in the present invention. In the figure, u a , u b , u c is the phase voltage of the three-phase grid; v a , v b , v c Input phase voltage for the AC side of the three-phase voltage type PWM rectifier; i a i b i c is the three-phase input phase current. Since the negative pole N on the DC side of the three-phase voltage-type PWM rectifier is generally not connected to the neutral point 0 on the AC side, no matter whether the three-phase grid voltage is balanced or not, there is i a + i b + i c = 0; L a , L b , L c is the inductance of the three-phase line filter reactor, and its order is α a 、α b 、α c , and 0a ,α b ,α c la, R lb , R lc is the equiv...
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The invention relates to the power electronic system modeling technology field and especially relates to a fractional order modeling method of a three-phase voltage type PWM rectifier. A fractional order characteristic of an inductor and a capacitor is considered, and a method for establishing a fractional-order model of a three-phase voltage-type PWM rectifier in a three-phase static (a, b, c) coordinate system, a two-phase static (D, Q) coordinate system, and a synchronous rotation (d, q) coordinate system and the corresponding fractional-order model of the three-phase voltage-type PWM rectifier in the three-phase static (a, b, c) coordinate system, the two-phase static (D, Q) coordinate system, and the synchronous rotating (d, q) coordinate system are provided. The method and the modelcan be conveniently used in a design and analysis of three-phase voltage-type PWM rectifier and a fractional-order controller so as to improve operation performance and a control effect. The fractional-order model of the three-phase voltage-type PWM rectifier in the three-phase static (a, b, c) coordinate system can realize high-precision waveform simulation of the three-phase voltage-type PWM rectifier.
Description
technical field [0001] The invention relates to the technical field of power electronic system modeling, in particular to a fractional-order modeling method for a three-phase voltage-type PWM rectifier. Background technique [0002] Fractional calculus is obtained after the calculus order of integer order calculus is extended from integers to non-integer numbers (fractions, irrational numbers, complex numbers). Nature is fractal in nature, and fractional calculus can be used to establish systematically accurate or more accurate fractional mathematical models. [0003] Literature Westerlund S, Ekstam L.Capacitor theory[J].IEEE TRANSACTIONS ONDIELECTRICS AND ELECTRICAL INSULATION and literature Westerlund S.Dead Matter HasMemory[M].Kalmar,Sweden:Causal Consulting research shows that: capacitance and inductance are essentially fractional order Yes, integer-order inductors and capacitors do not exist in actual engineering. The integer-order models used to describe the electrica...
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IPC IPC(8): H02M7/219
CPCH02M7/219
Inventor 徐俊华李啸骢
Owner GUANGXI UNIV