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Photovoltaic power generation grid-connected inverter control method based on active damping

A photovoltaic power generation and control method technology, applied in photovoltaic power generation, electrical components, circuit devices, etc., can solve the problems of weak anti-interference ability of grid-connected systems, difficulty in suppressing system resonance peaks, etc., and achieve the effect of improving anti-interference ability.

Pending Publication Date: 2022-02-15
XIAN UNIV OF TECH
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Problems solved by technology

[0007] The purpose of the present invention is to provide a photovoltaic power generation grid-connected inverter control method based on active damping, which solves the problem that the existing photovoltaic power generation grid-connected inverter control method is difficult to suppress system resonance peaks, making the grid-connected system weak anti-interference ability The problem

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  • Photovoltaic power generation grid-connected inverter control method based on active damping
  • Photovoltaic power generation grid-connected inverter control method based on active damping
  • Photovoltaic power generation grid-connected inverter control method based on active damping

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Embodiment Construction

[0062] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0063] The present invention is an active damping-based photovoltaic power generation grid-connected inverter control method, referring to figure 1 with figure 2 , including the following steps:

[0064] Step 1, collect the three-phase voltage U on the inverter side Ca , U Cb , U Cc and three-phase current i 1a , i 1b , i 1c , grid-side three-phase voltage U sa , U sb , U sc and three-phase current i 2a , i 2b , i 2c , and the DC side capacitor voltage U of the LCL type three-phase grid-connected inverter connected to the grid dc , respectively perform Park transformation on the collected inverter-side three-phase voltage and three-phase current, grid-side three-phase voltage and three-phase current;

[0065] Step 2, based on the LCL grid-connected inverter, establish the mathematical model of the Hamiltonian system, that is, t...

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Abstract

The invention discloses a photovoltaic power generation grid-connected inverter control method based on active damping. The control method comprises the following steps: acquiring an inverter signal, carrying out Park conversion, according to an LCL type grid-connected inverter, establishing a Hamilton system mathematical model, namely a PCHD mathematical model, calculating the passive control rate u of the system through the PCHD mathematical model, using the u to control an inverter The components Ud and Uq of the system control rate on the d axis and the q axis of the two-phase rotating coordinate system are obtained, the Ud and the Uq are converted into a two-phase static coordinate system, and Ualpha and Ubeta are obtained; inputting the Ualpha and the Ubeta into a wave trap to obtain processed alpha and beta axis modulation voltages Ualpha'and Ubeta ', inputting the modulation voltages Ualpha' and Ubeta 'into an SVPWM module in an inverter circuit to obtain a duty ratio signal of a switching tube of the inverter circuit, and inputting the duty ratio signal into a driving protection circuit of the LCL type three-phase grid-connected inverter to control the switching-on and switching-off of the switching tube of the inverter circuit.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and relates to a control method for a photovoltaic power grid-connected inverter based on active damping. Background technique [0002] Photovoltaic power generation is an important direction of new energy research, and photovoltaic grid-connected inverters are an important part of photovoltaic power generation systems. The structure of the photovoltaic power generation system is usually composed of two parts, namely the photovoltaic array and the grid connection part. [0003] The frequent start and stop of the switching devices in the inverter will cause a certain amount of harmonics on the output side. When the photovoltaic power generation energy is transmitted through the wires, the equivalent impedance of the wires and the stray inductance of the system, the capacitance may amplify these harmonic. In order to make the system output better, L-type, LC-type and LCL-type filters ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02M1/088H02J3/38
CPCH02M7/5387H02M1/088H02J3/381H02J2300/24H02J2203/20Y02E10/56
Inventor 李宁肖子涵张世乾郑爱香柳明
Owner XIAN UNIV OF TECH
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