VSG control method based on adaptive Terminal robust sliding mode

A control method and self-adaptive technology, applied in the direction of reducing/preventing power oscillation, AC network circuit, single network parallel feeding arrangement, etc., can solve the problem of not being able to simulate the dynamic response process of synchronous generators well and the system control effect is not good , poor robustness and other issues, to achieve good engineering application prospects, good control effect, good robustness effect

Inactive Publication Date: 2017-11-24
NANJING UNIV OF SCI & TECH
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Problems solved by technology

However, the classic second-order model cannot simulate the dynamic response process of synchronous generators well, and the traditional univariate PID

Method used

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  • VSG control method based on adaptive Terminal robust sliding mode
  • VSG control method based on adaptive Terminal robust sliding mode
  • VSG control method based on adaptive Terminal robust sliding mode

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Embodiment Construction

[0039] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the implementation examples described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0040] This embodiment first introduces the structure of the present invention in general, and then narrates the entire control method with examples according to the control sequence.

[0041] A virtual synchronous generator control method based on adaptive terminal robust sliding mode is implemented in such as figure 1 The distributed power grid-connected inverter system shown is mainly composed of four parts: distributed power supply and energy storage device (power supply part), inverter, inverter main circuit, and inverter control circuit .

[0042] The measurement module of the inverter control part measures the inverter output voltage, grid-connected poin...

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Abstract

The invention discloses a VSG (virtual synchronous generator) control method based on adaptive Terminal robust sliding mode. The VSG control method based on adaptive Terminal robust sliding mode includes the steps: enabling a distributed power supply with energy storage to be equivalent to a direct current voltage source so as to be taken as the prime mover portion of a virtual synchronous generator for supplying electric energy for the whole system; establishing the corresponding relationship between the inverter filtering parameters, the output voltage, the voltage and current of the point of common coupling and each parameter of the synchronous generator; considering a synchronous generator four-order model with an excitation system and valve adjustment to simulate the characteristics of the synchronous generator, and establishing a system mathematic model; according to the characteristics of two input variables of the system, determining two nonsingular Terminal sliding mode surfaces to realize decoupling control, and obtaining the control rule of the inverter based on Terminal robust sliding mode control; and after the control rule of the inverter is controlled through voltage and current double loop control, obtaining a driving signal of pulse width modulation (PWM) to control a DC/AC converter. The VSG control method based on adaptive Terminal robust sliding mode can significantly inhibit system oscillation, can improve stability of electric power system, and has good engineering application prospect.

Description

technical field [0001] The invention belongs to the technical field of smart grids, in particular to a VSG control method based on an adaptive Terminal robust sliding mode. Background technique [0002] The increasing scarcity of global energy and the increasingly prominent environmental problems have become hot issues in society in recent years. Therefore, the use of environmentally friendly and clean energy has attracted more and more attention. Distributed generation technology and microgrid technology are effective carriers, and their in-depth research has a beneficial role that cannot be ignored. The grid-connected inverter is the link between the distributed power supply and the microgrid / distribution network, and it must be reasonably controlled according to the load and the operating state of the grid. At present, the main control methods include constant power control (PQ control), constant voltage / constant frequency control (V / f control), and droop control (Droop ...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/24
CPCH02J3/24H02J3/38H02J2203/20
Inventor 王宝华严彬彬滕书宇李明磊刘宁
Owner NANJING UNIV OF SCI & TECH
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