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Parameter designing method of LCL filter of grid-connected inverter

A parameter design, inverter technology, applied in AC network to reduce harmonics/ripple, harmonic reduction device, single-network parallel feeding arrangement, etc., to achieve the effect of small value and intuitive and effective design method

Active Publication Date: 2014-12-24
NANJING ZHENGTU INFORMATION TECH CO LTD
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Problems solved by technology

The traditional LCL filter parameter design method needs repeated iterations and trial and error to meet the design requirements

Method used

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  • Parameter designing method of LCL filter of grid-connected inverter
  • Parameter designing method of LCL filter of grid-connected inverter
  • Parameter designing method of LCL filter of grid-connected inverter

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Embodiment Construction

[0026] The present invention will be further explained below in conjunction with the accompanying drawings.

[0027] Such as figure 1 The basic structure diagram of the LCL filter is given as shown, L 1 is the inverter side filter inductance, L 2 is the grid side filter inductance, C is the filter capacitor, U inv is the inverter output voltage, I g is the grid-side current, and the LCL filter is connected between the inverter and the grid. The design process of its inductance and capacitance parameters is as follows: figure 2 shown.

[0028] Further illustrate below the LCL filter parameter design method based on bridge arm output voltage rejection ratio involved in the present invention, comprise the steps:

[0029] (1), given the inverter structure and inverter switching frequency ω sw ;

[0030] (2), select the resonant frequency ω r : The selection range of the resonant frequency is:

[0031] 10ω g ≤ω r ≤0.2ω sw Formula 1)

[0032] In formula (1), ω g is ...

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Abstract

The invention provides a parameter designing method of an LCL filter of a grid-connected inverter. The parameter designing method of the LCL filter is based on the bridge arm output voltage rejection ratio. On the basis that an inverter structure and a modulation mode are determined, by selecting the harmonic attenuation proportionality coefficient at harmonic frequency and inverter switch frequency, the requirement for guaranteeing the filtering performance of LCL is met. Meanwhile, through optimized design, the values of filter inductance and filter capacitance are minimum, the designing method is visual and effective, the steps of error-and-try repeating are omitted, and easiness and quickness are achieved.

Description

technical field [0001] The invention belongs to the technical field of grid-connected inverters, and in particular relates to a parameter design method of an LCL filter of a grid-connected inverter. Background technique [0002] With the development and utilization of new energy sources, grid-connected inverters have received extensive attention from researchers. In order to make the grid-connected inverter's grid-connected current meet the requirements of relevant distributed generation standards, passive filters are usually added when grid-connected to suppress high-frequency harmonics and improve power quality. Because the LCL filter has better high-frequency suppression ability, because the design of the LCL filter is related to factors such as output current quality, control system design and cost. The traditional LCL filter parameter design method needs repeated iterations and trial and error to meet the design requirements. Contents of the invention [0003] Purpo...

Claims

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Application Information

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IPC IPC(8): H02M1/12H02J3/01H02J3/38
CPCY02E40/40
Inventor 庄超叶永强竺明哲赵强松何成骏张浩王建宏
Owner NANJING ZHENGTU INFORMATION TECH CO LTD
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