An active damping control method for lcl filter of z-source inverter

A technology of source inverter and damping control, which is applied to harmonic reduction devices and AC networks to reduce harmonics/ripples, reduce/prevent power oscillations, etc., and can solve problems affecting system stability and resonant peaks that cannot be ignored , achieving good dynamic and static characteristics, eliminating resonance peaks, and simple control

Active Publication Date: 2020-03-13
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

However, the resonance peak it brings cannot be ignored and will affect the stability of the system

Method used

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  • An active damping control method for lcl filter of z-source inverter
  • An active damping control method for lcl filter of z-source inverter
  • An active damping control method for lcl filter of z-source inverter

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Embodiment Construction

[0054] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0055] Such as figure 1 As shown, the LCL type Z-source inverter grid-connected system includes a DC voltage source Udc, a Z-source (impedance) network, a three-phase inverter and an LCL filter connected in sequence, and the Z-source inverter includes an inductor L 1z , L 2z , capacitance C 1 、C 2 , the LCL filter includes the inverter side three-phase inductance L 1a , L 1b , L 1c , three-phase filter capacitor C a 、C b 、C c and grid side three-phase inductance L 2a , L 2b , L 2c , and finally output the three-phase voltage Ua, Ub, Uc.

[0056] The overall control block ...

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Abstract

The invention relates to an active impedance control method for LCL filtering of a Z-source inverter. The active impedance control method is used in an LCL-type Z-source inverter grid-connected system and comprises the following steps of 1) acquiring a power grid current and a current of a filtering capacitor in an LCL filter, and outputting a sinusoidal pulse width modulation (SPWM) switch driving signal after dual-current ring control and SPWM control; 2) acquiring a capacitor voltage of a Z-source network, and outputting a through signal D0 after voltage ring control; and 3) obtaining the optimized switch driving signal according to the SPWM switch driving signal and the through signal D0. Compared with the prior art, the active impedance control method has the advantages of good stability, high grid-connected power factor, high control accuracy and high robustness.

Description

technical field [0001] The invention relates to the field of power grid control, in particular to an active damping control method for LCL filtering of a Z-source inverter. Background technique [0002] With the increasingly severe energy crisis, the development and utilization of new energy has become inevitable. Photovoltaic and wind power generation, as clean new energy power generation methods, have received great attention. The grid-connected inverter is an important part of new energy utilization. The upper and lower power tubes of the traditional inverter unified bridge arm cannot be turned on at the same time, otherwise it will cause a short circuit. On the other hand, the voltage-type inverter itself is a step-down inverter. When the input voltage is low or the fluctuation range is large, a boost circuit needs to be added in the front stage, which will lead to complex system structure and low efficiency. To solve this problem, Professor Peng Fangzheng proposed a Z...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01H02J3/38H02J3/24
CPCH02J3/01H02J3/24H02J3/38Y02E40/40
Inventor 杨旭红杨峰峰
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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