Method for controlling grid-connected inverter based on feed-forward compensation

A technology of feed-forward compensation and control method, which is applied in the direction of single-network parallel feeding arrangement, etc., can solve the problems of complicated design and difficult realization of current controller, and achieve the goal of eliminating amplitude gain peak, large stability margin, and simplified design Effect

Inactive Publication Date: 2012-07-04
ZHEJIANG UNIV
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Problems solved by technology

Theoretically speaking, this method can completely eliminate the disturbance effect of the grid voltage, but the feedforward coefficient of the grid voltage in the article contains proportional, first differential and second differential items, which is obviously difficult to achieve in engineering and is also Infeasible; moreover, the control system of this method is still a third-order system, so the design of the current controller is more complicated

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  • Method for controlling grid-connected inverter based on feed-forward compensation
  • Method for controlling grid-connected inverter based on feed-forward compensation
  • Method for controlling grid-connected inverter based on feed-forward compensation

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Embodiment Construction

[0025] In order to describe the present invention more specifically, the control method of the grid-connected inverter of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] Such as image 3 As shown, a control method of grid-connected inverter based on feed-forward compensation includes the following steps:

[0027] (1) Acquisition of grid voltage v g , the grid side current and the capacitor current of the LCL filter;

[0028] In this embodiment, the grid-connected inverter converts 450V direct current into 220V alternating current, which is filtered by an LCL filter and then input to the grid.

[0029] The grid-connected inverter is a 5kW single-phase voltage source inverter VSI, which has 4 IGBTs (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor), and the switching frequency of the IGBTs is 8.4kHz.

[0030] The LCL filter includes the inverter side inductance L 1 , ...

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Abstract

The invention discloses a method for controlling a grid-connected inverter based on feed-forward compensation. The method comprises the following steps of: (1) acquiring a grid voltage, a grid side current and a capacitance current; (2) according to the grid side current, generating an instruction signal; (3) according to the grid voltage and the capacitance current, acquiring a current feed-forward signal and a voltage feed-forward signal; and (4) superposing the instruction signal, the current feed-forward signal and the voltage feed-forward signal to obtain a modulation signal, and generating a switching signal for controlling the grid-connected inverter according to the modulation signal. The method has the advantages that: a second-order differential feed-forward item of the grid voltage is compensated by a first-order differential feed-forward link of the capacitance current, so that a third-order system is reduced to a first-order system, the stability margin of the system is improved, the design process of a current regulator is simplified, and the grid side current cannot be influenced by grid voltage harmonic waves.

Description

technical field [0001] The invention belongs to the technical field of power inverter control, and in particular relates to a control method of a grid-connected inverter based on feedforward compensation. Background technique [0002] In recent years, with the increasing environmental pollution and energy shortage, the development and utilization of renewable energy (such as solar energy, wind energy, etc.) has become an urgent need for human society. As a necessary interface device for renewable energy generation systems to connect to the grid, grid-connected inverters have become a research hotspot in the field of power electronics. [0003] In order to suppress the voltage and current ripples generated by high-frequency switching, grid-connected inverters generally use L-type filters or LCL-type filters as the necessary interface components with the grid. Due to the limited ability of the L-type filter to suppress high-frequency harmonics, it is generally necessary to us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
Inventor 白志红马皓
Owner ZHEJIANG UNIV
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