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Photovoltaic LCL grid-connected inverter harmonic suppression method based on PI and MPR

A harmonic suppression and inverter technology, applied in AC network to reduce harmonic/ripple, harmonic reduction device, AC network circuit, etc., can solve problems such as unsuitable for practical application, complex design, etc. wave, ensure steady-state operation, and ensure the effect of dynamic response

Pending Publication Date: 2020-11-10
XIAN THERMAL POWER RES INST CO LTD +1
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  • Application Information

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Problems solved by technology

Another method is to establish a grid-connected model based on LC-type virtual synchronous generators. In order to effectively suppress the resonance caused by harmonics, a virtual impedance is introduced. Although this method has a better control effect, the design is complicated and not suitable for practical applications.

Method used

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  • Photovoltaic LCL grid-connected inverter harmonic suppression method based on PI and MPR
  • Photovoltaic LCL grid-connected inverter harmonic suppression method based on PI and MPR
  • Photovoltaic LCL grid-connected inverter harmonic suppression method based on PI and MPR

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Embodiment Construction

[0036] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and examples.

[0037] The present invention provides one kind of PI and MPR based photovoltaic LCL grid inverter harmonic suppression method, comprising the steps of:

[0038] Step 1, to establish LCL-phase inverter with current feedback and closed-loop control model;

[0039] Step 2 In Step 1 LCL established three-phase grid-connected inverter current feedback control loop model, application of the ratio - resonance control and analyze the transfer function;

[0040] Step 3, in Comparative Step 2 - resonance improved control, improved draw ratio - resonance controller transfer function analysis;

[0041] Step 4, the contrast ratio in step 2 - A 3 Improved resonance amplitude ratio versus frequency characteristic controller, contrast gain, phase angle, the verification step - - resonance control and improved step 3 Comparative advantages of resonant ...

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Abstract

The invention discloses a photovoltaic LCL grid-connected inverter harmonic suppression method based on PI and MPR. The method comprises the steps: building an LCL type three-phase grid-connected inverter current feedback closed-loop control model; employing proportional resonance control, and analyzing a transfer function; improving the proportional resonance control, and acquiring an improved proportional resonance controller; comparing the amplitude-frequency characteristic curves of the proportional resonance controller and the improved proportional resonance controller, comparing the gainand the phase angle, and verifying the superiority of the improved proportional resonance controller; in order to suppress fifth and seventh specific harmonics in the grid-connected current, constructing a multi-proportion controller; introducing the multi-proportion controller into an improved proportional resonance controller, and analyzing a transfer function; wherein the improved proportionalresonance controller containing multiple proportional controllers is mostly applied to current PI control of a photovoltaic LCL grid-connected inverter, and effective suppression of low-order harmonics such as fifth-order harmonics and seventh-order harmonics existing in output current is achieved on the premise that error-free tracking of reference current is guaranteed.

Description

Technical field [0001] The present invention belongs to the technical field of photovoltaic power generation, particularly relates to harmonic suppression based photovoltaic LCL PI MPR and the grid inverter method. Background technique [0002] As a new distributed solar power generation unit, due to their own limitations compared to traditional power generation industry, having island effect, harmonic pollution. [0003] Harmonic pollution is PV grid must be addressed. Grid voltage, current waveform distortion would be along the lines of electromagnetic interference, increase the burden of running the load, would be safe, reliable operation of the power grid caused serious damage in severe cases. Thus, the harmonic current and photovoltaic power generation sites accurately detected, and effectively suppressed is essential. [0004] In the photovoltaic power generation and current harmonic suppression grid inverter aspect, a method is the transformation hardware inverter circuit ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/01H02J3/24
CPCH02J3/381H02J3/01H02J3/24H02J2300/22H02J2203/20Y02E40/40Y02B10/10
Inventor 冯仰敏王恩南谭光道杨沛豪杨明伟张宝锋李楠
Owner XIAN THERMAL POWER RES INST CO LTD
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