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Robust controller design method for grid-connected inverter parallel system

A technology of a robust controller and design method, which is applied in the direction of AC network circuit, single-network parallel feeding arrangement, output power conversion device, etc. Wide, simplified control strategy and controller implementation, the effect of ensuring stability

Inactive Publication Date: 2018-07-31
TIANJIN UNIV
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  • Description
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Problems solved by technology

The control methods currently used all have some problems that need to be improved, such as complex control strategies and low control precision.

Method used

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  • Robust controller design method for grid-connected inverter parallel system
  • Robust controller design method for grid-connected inverter parallel system
  • Robust controller design method for grid-connected inverter parallel system

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Embodiment Construction

[0037] specific implementation plan

[0038] According to the process figure 1 Invented controller design flow, first of all for figure 2 The single-phase grid-connected inverter parallel system is shown, and the single-arm direct current control model is obtained as follows: image 3 , which can be specifically expressed as:

[0039]

[0040] In the formula, i * is the current reference value, i 1 is the actual output value of the current, K(s) is the controller, U dc is the DC voltage, U e It is the equivalent voltage interference signal of harmonics, delay and voltage waveform distortion generated by the nonlinear characteristics of the inverter bridge, u s1 is the voltage variable of the AC busbar to the midpoint of the DC power supply, P(s) is the nominal model of the inductance link, W(s) represents the upper bound of the uncertainty of the inductance parameter, Δ 1 (s) is the normalized model uncertainty, ||Δ 1 (s)||<1.

[0041] Will image 3 Closed-loop c...

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Abstract

The invention provides a design method for a robust controller of a grid-connected inverter parallel system, comprising the steps of establishing a single bridge arm closed-loop control model including external disturbances and uncertainties of inter parameters according to the structure of the inverter parallel system; determining each input / output signal, converting the model into a standard H(infinity) control problem, and then converting into a control system with a block diagonal structure uncertainty; designing the weight function of each input / output signal; and designing the robust controller by using a mu synthesis method. By using the controller designed according to the method provided by the invention, the influence of various uncertainties can be inhibited, and thereby the stability and performance of the grid-connected inverter parallel system are improved, and the accurate control on the grid-connected current and the inhibition on ring current are achieved.

Description

technical field [0001] The invention belongs to the field of renewable energy power generation, and in particular relates to a control method for a grid-connected inverter parallel system. Background technique [0002] Due to the depletion of non-renewable energy such as global fossil energy and the increasing environmental pollution, the effective use of clean and renewable energy has become an important choice for the energy strategies of countries around the world. Distributed power generation technology using renewable energy for power generation has received more and more attention and application. Distributed generation systems are usually connected to the grid through grid-connected inverters, and transmit active and reactive power to the grid as required. As an interface device, the function of the grid-connected inverter is to accurately control the current injected into the grid into a sinusoidal waveform, so as to realize the transmission of predetermined active ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/493H02J3/38
CPCH02J3/382H02J2203/20H02M7/493
Inventor 方红伟贺叶君
Owner TIANJIN UNIV
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