LCL type three-phase grid-connected inverter control method

A control method and inverter technology, which is applied in the direction of AC network circuit, single network parallel feeding arrangement, AC power input conversion to DC power output, etc., can solve the problems of cumbersome and complicated controller design, and achieve high control accuracy , Improving the ability of rapid response and the effect of fast response

Active Publication Date: 2019-04-26
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

However, the adaptive controller designed by it can only compensate harmonics of a specific order, and the design of the controller is relatively complex
The improved WACC damping method with an additional

Method used

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  • LCL type three-phase grid-connected inverter control method
  • LCL type three-phase grid-connected inverter control method
  • LCL type three-phase grid-connected inverter control method

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[0032] Such as figure 1 The overall structure diagram of the LCL grid-connected inverter control strategy based on active damping and current error feedback composite control proposed by the present invention is shown, which mainly includes a DC voltage source V dc , Three-phase LCL grid-connected inverter based on pulse width modulation control, the inductance on the inverter side is L 1 , The grid-connected side inductance is L 2 , The filter capacitor is C, the grid side three-phase current and capacitive current sensor, and the coordinate converter. The main control process is as follows: First, the outer loop uses a grid-side three-phase current sensor to collect three-phase grid-connected current i 2 , And the three-phase grid current i 2 The current component i is converted from the three-phase stationary coordinate system to the two-phase rotating coordinate system by coordinate transformation d , I q , And then with reference current i dref , I qref Make a difference t...

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Abstract

The invention relates to an LCL type three-phase grid-connected inverter control method. The method includes first obtaining a preliminary PWM modulation signal by a traditional active damping controlmethod, then estimating the current after the resonance peak is suppressed according to the feature that an L-type filter and an LCL filter are consistent in characteristic at the low and medium frequency, obtaining the difference between the current and the actual current to be corrected by a current observer at the low and medium frequency, meanwhile feeding the higher harmonic part of the error current back to a control loop and introducing a network voltage feed forward item to obtain a final modulation signal and further control the access current of a grid-connected inverter. The accesscurrent is controlled in a two-phase rotating coordinate system, and the shortcoming that PI control cannot track an AC signal without static difference is overcome. On the basis of taking into account the advantages of active damping, the access harmonic components are further attenuated, and the grid-connected current quality and the system rapid response capability are improved. The method hasthe advantages of high control precision, high reaction speed and high reliability and is suitable for new energy integration grid-connected power generation systems.

Description

technical field [0001] The invention relates to an inverter control technology, in particular to an LCL type three-phase grid-connected inverter control method based on active damping and current error feedback control. Background technique [0002] In the 21st century, countries all over the world pay more and more attention to the control of energy crisis and environmental pollution. Facing the grim situation of energy depletion and increasing environmental pollution, people are paying more and more attention to the infinite possibilities brought by new energy sources such as wind energy, solar energy, and nuclear energy. The research of inverter control technology has become a very important content. The filters commonly used in inverters are L-type, LC-type and LCL-type filters. Compared with the first two filters, the LCL filter has a higher attenuation ability for high-frequency harmonics and a smaller volume. It is widely used, but the third-order characteristics of...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02M7/5383
CPCH02J3/382H02M7/5383H02M1/0003H02M7/4815Y02B70/10
Inventor 杨旭红刘洋陈昊张云飞姚凤军陆浩郝鹏飞宋兴龙
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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