Energy storage type quasi-Z-source converter and fuzzy control method and system thereof

A technology of fuzzy control and converter, applied in the direction of output power conversion device, conversion of AC power input to DC power output, collector, etc.

Inactive Publication Date: 2020-10-23
HUNAN CHUTIAN ELECTRICAL IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The present invention provides an energy storage quasi-Z source converter and its fuzzy control method and system to solve t

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  • Energy storage type quasi-Z-source converter and fuzzy control method and system thereof
  • Energy storage type quasi-Z-source converter and fuzzy control method and system thereof
  • Energy storage type quasi-Z-source converter and fuzzy control method and system thereof

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Embodiment Construction

[0046] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways defined and covered by the claims.

[0047] figure 1 It is a schematic diagram of the circuit structure of the energy storage type quasi-Z source converter of the present invention, figure 1 middle and are DC link capacitors, and is the impedance network inductance, , , and form an impedance network. is the AC side inductance. is the open circuit voltage of the energy storage battery pack, is the internal resistance of the battery, It is a bidirectional power switch with commutation function, is the network power switch, Capacitance and The DC link voltage, is the DC side input voltage, is the input current on the DC side, Outflow inductance for the DC side the inductor current, is the grid side current, is the grid voltage.

[0048] Depend ...

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Abstract

The invention discloses an energy storage type quasi-Z-source converter and a fuzzy control method and system thereof. The quasi-Z-source converter comprises an impedance network composed of a first DC link capacitor C1, a second DC link capacitor C2, a first impedance network inductor L1 and a second impedance network inductor L2 as well as a bidirectional full-bridge converter consisting of a first bidirectional power switch Q1, a second bidirectional power switch Q2, a first bidirectional power switch Q3 and a first bidirectional power switch Q4; a network power switch Q is connected between the first impedance network inductor L1 and the second impedance network inductor L2. The fuzzy control method comprises the steps that the input side of the quasi-Z-source converter is connected with an energy storage battery, and the inversion side of the quasi-Z-source converter is connected with a power grid; and fuzzy control is adopted to control a single energy storage type quasi-Z-sourceconverter. The capacitor voltage fluctuation is narrow, and the direct-current side voltage is more stable; in a steady state, the total harmonic distortion rate of the power grid current is lower; when the charging and discharging current of the battery changes, the transition process is stable.

Description

technical field [0001] The invention relates to the technical field of fuzzy control of energy storage converters, in particular to an energy storage type quasi-Z source converter and its fuzzy control method and system. Background technique [0002] Since the Z-source converter (ZSC, Z-Source Inverter) and quasi-Z-source converter (QZSC, Energy-Storaged Quasi Z-Source Converte) were proposed, they have received extensive attention and a lot of research. [0003] Compared with traditional power electronic inverters, ZSC / QZSC has the following advantages: [0004] 1) Able to realize single-stage buck-boost; [0005] 2) There is no need for dead time, which can eliminate the output distortion caused by the dead time of traditional inverters; [0006] 3) In the straight-through state, the switching tubes of the same bridge arm can be turned on at the same time, which increases the anti-interference ability of the inverter; [0007] 4) The number of switches is small, thus re...

Claims

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Application Information

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IPC IPC(8): H02M7/797H02J7/10H02J7/00
CPCH02J7/0068H02J7/06H02M7/797H02J7/00714
Inventor 陈伟其
Owner HUNAN CHUTIAN ELECTRICAL IND
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