Scalable quasi-z source boost converter and its double integral sliding mode control method
A boost converter and control method technology, applied in control/regulation systems, DC power input conversion to DC power output, instruments, etc., can solve the problem of large start-up surge current, limited boosting capacity, unfavorable converter miniaturization, etc. question
Active Publication Date: 2020-12-29
SHANGHAI MARITIME UNIVERSITY
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Problems solved by technology
[0003] The traditional Z-source power converter has some disadvantages: 1) The start-up surge current is large, which is easy to damage the switching device; 2) The capacitor voltage stress is large in the steady state, which is not conducive to the miniaturization of the converter; 3) The boosting capacity is limited
However, the PWM frequency is limited, so the above control method is insufficient in reducing the steady-state error
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[0081] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0082] The present invention provides a scalable quasi-Z source boost converter, such as figure 1 As shown, including: DC power supply DC, capacitor C 0 ~Capacitance C 2n+2 , inductance L 1 ~Inductance L n+2 , resistor R, diode D, switch tube S 1 ~ switch tube S n+2 ;
[0083] Capacitance C 2k-1 The second terminal of the capacitor C is connected 2k+1 The first end of , where k∈[1,n];
[0084] Inductance L k The first terminal of the capacitor C is c...
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The invention provides an extensible quasi-Z-source boost converter and a double-integral sliding mode control method. The method comprises the steps: S1, driving a switching tube through a PWM pulse,and building a dynamic model of the boost converter; S2, defining a control variable of the boost converter, and designing a sliding mode surface of the boost converter according to the control variable; S3, designing a reaching law of the double-integral sliding mode control method according to the sliding mode surface, and defining a local accessibility condition of the double-integral slidingmode control method; S4, according to the sliding mode surface, solving a dynamic equivalent control rate of the double-integral sliding mode control method by applying the reaching law; S5, solving asliding mode coefficient value according to the accessibility condition and the stability condition of the double-integral sliding mode control method; S6, updating the dynamic equivalent control rate according to the sliding mode coefficient value, updating the PWM pulse according to the dynamic equivalent control rate, and entering the S1.
Description
technical field [0001] The invention relates to the technical field of scalable quasi-Z source boost converters, in particular to a double integral sliding mode control method based on scalable quasi-Z source boost converters. Background technique [0002] In recent years, as environmental problems have become more prominent and traditional energy resources are insufficient, renewable energy such as photovoltaic and wind energy systems are receiving considerable attention. However, the output voltage of new energy power generation systems represented by photovoltaics, wind energy and fuel cells is usually lower than the supply grid voltage. In this case, there is an urgent need for a DC-DC converter with high gain and strong anti-interference ability to boost the voltage. [0003] The traditional Z-source power converter has some disadvantages: 1) The start-up surge current is large, which is easy to damage the switching device; 2) The capacitor voltage stress is large in t...
Claims
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IPC IPC(8): H02M3/158
CPCH02M3/1584
Inventor 唐代卫李军军刘冲周瑞平
Owner SHANGHAI MARITIME UNIVERSITY