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Resonance current suppression method of LCL type grid connected inverter, without capacitance and current sensors

A current sensor and resonant current technology, applied in AC network circuits, AC networks to reduce harmonics/ripples, electrical components, etc., can solve problems such as increasing control risks, amplifying system noise, increasing system costs, etc., to achieve elimination of control risk, eliminate amplified system noise, eliminate the effect of increased

Active Publication Date: 2017-11-24
XIAN UNIV OF TECH
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Problems solved by technology

However, the feedback capacitor current requires an additional sensor with a higher sampling frequency, which will undoubtedly increase the cost of the system
Although it is not necessary to add sensors to feed back the incoming current, the feedback link usually includes a differential link, which will amplify system noise and increase the control risk of the actual system in the case of random errors in measurement

Method used

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  • Resonance current suppression method of LCL type grid connected inverter, without capacitance and current sensors
  • Resonance current suppression method of LCL type grid connected inverter, without capacitance and current sensors
  • Resonance current suppression method of LCL type grid connected inverter, without capacitance and current sensors

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Embodiment Construction

[0052] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0053] The invention provides a resonant current suppression method for a non-capacitance current sensor of an LCL type grid-connected inverter. The control method is as follows: figure 1 As shown, the specific steps are as follows:

[0054] Step 1, the input current i of the grid-connected inverter ga i gb i gc Obtain the active component i of the incoming current through synchronous coordinate transformation gd and reactive component i gq , put i gd and i gq Subtracting from a given reference value and regulating control through an improved control regulator;

[0055] Step 1 is specifically implemented according to the following steps:

[0056] Step 1.1, the input current i ga i gb i gc Transform from the three-phase stationary coordinate system to the two-phase synchronous rotating coordinate system to obtain the active componen...

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Abstract

The invention discloses a resonance current suppression method of an LCL type grid connected inverter, without capacitance and current sensors. The resonance current suppression method of an LCL type grid connected inverter, without capacitance and current sensors includes the following concrete steps: 1) obtaining an active component igd and a reactive component igq of the access current through synchronous coordinate conversion of the access current iga, igb and igc of a grid connected inverter, subtracting igd and igq from the given reference value and performing adjustment and control through an improved control adjuster; and 2) processing the active component igd and the reactive component igq of the access current through a feed link without differential, then subtracting igd and igq from the output quantity of the improved control adjuster, obtaining a three phase modulation signal through reverse synchronous coordinate conversion and generating a PWM wave to realize resonance suppression control of the grid connected inverter. The resonance current suppression method of an LCL type grid connected inverter, without capacitance and current sensors does not need sampling of capacitance and current, thus effectively saving the system cost, and eliminating the hidden trouble of amplifying system noise and increasing control risks because of the differential link.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a resonance current suppression method for a non-capacitance current sensor of an LCL type grid-connected inverter. Background technique [0002] In order to alleviate the problems of limited traditional fossil energy resources and environmental pollution caused by combustion, clean renewable energy such as wind energy and solar energy have been widely researched and applied in the form of distributed power generation. These renewable energy sources are connected to the grid through a grid-connected inverter. In order to suppress a large amount of switching harmonic current from entering the grid, the output end of the grid-connected inverter is usually connected to the grid through an L-type or LCL-type filter. The LCL filter was first proposed by J.Svensson and M.Lindgren in 1995. The high-frequency harmonic current output by the grid-connected inverter w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/38
CPCH02J3/01H02J3/382Y02E40/40
Inventor 张晓滨黄佳敏苏战停伍文俊何瑞
Owner XIAN UNIV OF TECH
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