Disturbance suppression system and method based on combination of model inverse structure and multi-ring frequency division disturbance observer

A disturbance observer and disturbance suppression technology, which is applied in the direction of irreversible DC power input conversion to AC power output, AC network voltage adjustment, reduction/prevention of power oscillation, etc., can solve problems such as system stability impact, and achieve enhanced reliability performance, improve disturbance suppression ability, and improve stability

Active Publication Date: 2021-06-18
HUBEI UNIV OF TECH
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Problems solved by technology

However, its disturbance is still suppressed by feedback, and a larger feedback coefficient is likely to affect the stability of the system

Method used

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  • Disturbance suppression system and method based on combination of model inverse structure and multi-ring frequency division disturbance observer
  • Disturbance suppression system and method based on combination of model inverse structure and multi-ring frequency division disturbance observer

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Embodiment Construction

[0029] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0030]The specific solution of the present invention to solve the technical problem is: adopt the method of combining the model inverse and the disturbance observer, enhance the tracking performance of the control system through the model inverse structure based on internal model control, and use the multi-ring frequency division disturbance observer from the intermediate frequency and the disturbance observer respectively. The low frequency performs frequency division disturbance compensation on it.

[0031] Such as figure 1 Shown is the control strategy block diagram of the main inverter. The distributed power is connected to the main grid through the voltage type inverter, and the virtual synchronous motor control strategy is selected, so that the distributed power can actively participate in the active power frequency regula...

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Abstract

The invention relates to a disturbance suppression system and method based on the combination of a model inverse structure and a multi-ring frequency division disturbance observer. The method mainly comprises the following steps that: a virtual synchronous motor controller is selected to pass through a control system based on the model inverse structure and the disturbance observer when a distributed power supply is connected to a main power grid through a voltage type inverter; the distributed power supply can actively participate in active frequency modulation and reactive voltage regulation processes of a power system, and voltage and current reference values are obtained at the same time; and the voltage and current controller is used for finely adjusting the injected voltage and current. The reliability of an inverter control system can be effectively enhanced, the stability is improved, current change and load power fluctuation caused by loop switching can be avoided when the operation mode of the micro-grid is switched through a static switch, and smooth switching of the operation mode of the micro-grid is realized.

Description

technical field [0001] The invention relates to the field of micro-grid inverter control, and in particular uses the combination of a model inverse structure and a disturbance observer to enable the system to simultaneously have tracking and anti-disturbance performance, thereby improving the anti-disturbance capability of each frequency band of the system. Background technique [0002] As the penetration of microgrid continues to increase, whether distributed power can be stably integrated into the grid has become an important aspect of research in the field of microgrid. Whether it is an internal disturbance caused by control loop switching or an external disturbance caused by the imbalance between supply and demand, it will affect the stability of the system. Even, during the mode switching process, the superimposed disturbance impact of the two is greater. Therefore, it is very necessary to improve the anti-disturbance ability of the system. [0003] Currently, the mos...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/24H02J3/16H02J3/18H02J3/40H02M7/48
CPCH02J3/381H02J3/388H02J3/241H02J3/16H02J3/18H02J3/40H02M7/48H02J2203/20Y02E40/30
Inventor 常雨芳张惠雯朱禛浩胡宇博杨子潇朱自铭张凤顺王浩源潘风黄文聪
Owner HUBEI UNIV OF TECH
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