Single-phase grid-connected inverter control device based on lyapunov state function

A state function and control device technology, applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., can solve the problems of complex control variables and high accuracy requirements of feedback parameters, etc., to ensure dynamic performance, reduced steady-state tracking error, and simplified design

Active Publication Date: 2017-12-08
ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER
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  • Application Information

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Problems solved by technology

In the existing devices, repetitive control is added to the state feedback in the pole configuration mode, which effectively suppresses the cycle delay of the command signal in the closed-loop control system, but the state feedback control variables in the pole state are complex and the accuracy of the feedback parameters is high.

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  • Single-phase grid-connected inverter control device based on lyapunov state function
  • Single-phase grid-connected inverter control device based on lyapunov state function
  • Single-phase grid-connected inverter control device based on lyapunov state function

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Embodiment Construction

[0030] We know that the control objectives of the single-phase grid-connected inverter are mainly: 1) Realize the sinusoidal change of the grid-connected output current and the same frequency and phase as the voltage frequency. When the single-phase grid-connected inverter is connected to the grid, the dynamic response speed of the inverter is required Fast, and suppress the various harmonics generated by the grid while responding quickly; 2) When the single-phase grid-connected inverter is connected to the grid, it is required not only to achieve no static error for the DC reference signal but also to achieve no error tracking of the sinusoidal signal , and it is necessary to prevent the control coupling between the inverter controllers to prevent the grid-connected inverter from generating power distortion in the dynamic process.

[0031] In order to achieve such a purpose, the present invention adopts the Lyapunov state function, which can make up for the cycle delay of the ...

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Abstract

The invention discloses a single-phase grid-connected inverter control device based on a Lyapunov state function, which includes a reference current collection module for collecting the output current of the inverter; a Lyapunov control module for collecting the reference current Iref(s) Produce voltage signal uLyapunov1 through Lyapunov control module; The first control module, its control function is Q(s)e-sT; The second control module, its control function is G f ( s ) = 1 H ( s ) × 1 1 + s ; The third control module, its control function is G c ( s ) = v s - u V dc - Ri c ls ; The fourth control module, whose control function adopts the Lyapunov state function of the present invention, can make up for the shortcomings of repeated control of the internal model closed-loop system instruction signal cycle delay and slow dynamic response speed, and fully guarantee the dynamic performance of the control system.

Description

technical field [0001] The invention relates to the field of single-phase grid-connected inverter control devices, in particular to a single-phase grid-connected inverter control device based on Lyapunov (Lyapunov) state function. Background technique [0002] Nowadays, environmental pollution is becoming more and more serious, forcing people to seek green energy. Among them, renewable energy and new energy storage are widely used. Most of these new energies are connected to the grid through inverters, especially low-power distributed access, such as photovoltaics, batteries, supercapacitors, etc. The core component of the power generation system. As the penetration rate of new energy in the local power grid gradually increases, the stability, dynamic response speed and steady-state tracking ability of the single-phase inverter control system are crucial to maintaining the normal operation of the system after the new energy is connected to the grid. [0003] Traditional si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387
Inventor 王金浩吴玉龙齐月文徐龙杜慧杰杨超颖李胜文李慧蓬张敏肖莹唐震
Owner ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER
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