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A nonlinear inductance analysis method and three-phase pwm converter control method

An analysis method and nonlinear technology, applied in the direction of converting AC power input to DC power output, electrical components, and AC network to reduce harmonics/ripples, etc., can solve the problem of large current harmonics on the grid side and current loop controller Insufficient design, difficult to judge the system stability and other problems, to achieve the effect of maintaining stability of the control system, solving stability problems, and improving dynamic characteristics

Active Publication Date: 2019-06-18
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a nonlinear inductance analysis method and a three-phase PWM converter control method, thereby solving the current Loop controller design lacks theoretical guidance of the system, the current harmonics on the grid side are too large, and the technical problems of system stability are difficult to judge

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  • A nonlinear inductance analysis method and three-phase pwm converter control method
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  • A nonlinear inductance analysis method and three-phase pwm converter control method

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Embodiment 1

[0082] As an embodiment of the control method of the present invention, the basic parameters of the three-phase PWM converter are: grid side line voltage v ab =220V, DC bus voltage v bus =400V, switching frequency f s =20kHz, DC bus capacitance C bus =1800uF, load resistance R=24Ω(6667W), grid-side inductance is made of Magnetics KoolMu material model 77617 magnetic powder core winding, the initial inductance factor of the magnetic powder core is A L0 =189nH / N 2 , winding turns N=75, magnetic circuit length l e =14.4cm, the corresponding parameter of the magnetic permeability-DC bias fitting curve is a=-4.445×10 -3 , b=-8.763×10 -5 , c=9.446×10 -7 , d=-2.616×10 -9 , static inductance value L 0 = 1.065mH.

[0083] Preferably, the parameter setting process of the nonlinear inductance model is as follows: first, according to the number of turns N of the inductor winding and the length of the magnetic circuit l e The calculated m=5.208, then the relationship curve of the...

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Abstract

The invention discloses a non-linear inductance analysis method and a control method of a three-phase pulse width modulation (PWM) converter. The analysis method comprises the steps of building a non-linear inductance model of a magnetic powder core according to inductance winding turns, an initial inductance factor when an inductance current is zero, the length of a magnetic path of the magnetic core, a current passing through a winding and a fitting curve coefficient; and obtaining an equivalent inductance value of non-linear inductance by the non-linear inductance model of the magnetic core. The control method employs a non-linear inductance analysis method, and the influence brought by the fact that the inductance value changes with an input current is offset. By the analysis method, the three-phase PWM converter can be enabled to stably run, the running reliability of a circuit is improved, and meanwhile, the current harmonic of a power grid side is reduced.

Description

technical field [0001] The invention belongs to the field of three-phase PWM converters, and more specifically relates to a nonlinear inductance analysis method and a three-phase PWM converter control method. Background technique [0002] The three-phase PWM converter has many advantages such as low current harmonics on the AC side, high power factor, bidirectional flow of energy, etc., and has become a key research field in the field of power electronics. Its input filter inductor can be wound with magnetic materials such as ferrite, iron powder core and magnetic powder core. However, due to the advantages of high DC bias voltage, high AC excitation amplitude and high saturation magnetic flux density of magnetic powder core, the inductor with magnetic powder core The size of the inductor is much smaller than that of the inductor with ferrite and iron powder core. At present, the input inductors of three-phase PWM converters in the industry are mostly wound with magnetic po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/219H02J3/01
CPCH02J3/01H02M7/219Y02E40/40
Inventor 刘邦银李其琪段善旭魏琪康
Owner HUAZHONG UNIV OF SCI & TECH