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Input/output linearization-based quasi-Z-source inverter photovoltaic grid-connected control method

A source inverter and control method technology, applied in the field of quasi-Z source inverter photovoltaic grid-connected control based on input/output linearization, to achieve the effect of smooth transient, simplify the design process, and improve the quality of grid-connected current

Inactive Publication Date: 2018-08-07
SICHUAN UNIV
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  • Description
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Problems solved by technology

[0003] Studies have pointed out that the transfer function of the QZSI impedance source network has a right-half-plane zero point, which makes the impedance source capacitance voltage overshoot and oscillate when the input voltage is disturbed.

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  • Input/output linearization-based quasi-Z-source inverter photovoltaic grid-connected control method
  • Input/output linearization-based quasi-Z-source inverter photovoltaic grid-connected control method
  • Input/output linearization-based quasi-Z-source inverter photovoltaic grid-connected control method

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Embodiment Construction

[0028] The invention proposes a QZSI input / output linearization modeling method and a QZSI grid-connected control strategy, so that when the operating point of the QZSI changes greatly, it can better track the reference input voltage, reduce the influence of the DC side on the AC side, and improve grid-connected current quality.

[0029] The structure and mathematical model of the QZSI system will be introduced first.

[0030] The topology of single-phase QZSI grid-connected system is as follows: figure 1 shown. QZSI consists of a quasi-Z source impedance network and a single-phase two-level inverter. The quasi-Z source impedance network consists of an inductor L 1 and L 2 , capacitance C 1 and C 2 (L 1 =L 2 = L, C 1 =C 2 =C), and the diode D, which is essentially a passive boost network, the input voltage v in Through the quasi-Z source impedance network and under the action of the bridge arm of the inverter bridge, it is modulated into the desired high-frequency p...

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Abstract

The invention provides an input / output linearization-based quasi-Z-source inverter photovoltaic grid-connected control method. According to the method of the invention, the input / output linearizationmodeling method of a QZSI (quasi-Z-source inverter) and a QZSI grid-connected control strategy are provided, and therefore, when the QZSI changes greatly at an operating point, a reference input voltage can be better tracked, the influence of a direct-current side on an alternating-current side can be decreased, and grid-connected current quality can be improved.

Description

technical field [0001] The invention relates to the field of photovoltaic technology, in particular to a quasi-Z source inverter photovoltaic grid-connected control method based on input / output linearization. Background technique [0002] Quasi-Z-Source Inverter (QZSI) is a single-stage DC-AC topology that has received extensive attention and research in the application of photovoltaic systems. In order to realize the grid-connected operation of QZSI, it is necessary to carry out systematic modeling and control of QZSI. [0003] Previous studies have pointed out that the transfer function of the QZSI impedance source network has a right-half-plane zero point, which makes the impedance source capacitance voltage overshoot and oscillate when the input voltage is disturbed. Some literatures propose classic or modern control methods such as PI control, sliding mode control, fuzzy control, model predictive control, deadbeat control, etc., which can enable the Z-source inverter t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02M7/48
CPCH02J3/383H02J3/385H02M7/48H02J2203/20Y02E10/56
Inventor 李媛方番
Owner SICHUAN UNIV
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