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Double-layer self-adaptive inertia control method and device for inverter interfaced distributed generator

An inverter-type distributed and adaptive control technology, applied in the field of smart grid, can solve problems such as unfavorable system stable operation, poor dynamic response characteristics of output power, inability to meet power supply requirements, etc., and achieve excellent control effects.

Active Publication Date: 2019-09-20
SHANGHAI JIAO TONG UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

The effect of virtual inertia on VSG-IIDG output frequency and power is different. Power adjustment requires small inertia, but if VSG adopts low inertia, the frequency fluctuation will be large, which is not conducive to the stable operation of the system
Therefore, if the two are not considered at the same time, it may lead to poor dynamic response characteristics of VSG-IIDG output power in different operating scenarios, or even fail to meet the power supply requirements

Method used

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  • Double-layer self-adaptive inertia control method and device for inverter interfaced distributed generator
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  • Double-layer self-adaptive inertia control method and device for inverter interfaced distributed generator

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Embodiment Construction

[0027] Such as figure 1 Shown is the control topology of IIDG based on VSG, in which the PWM signal controls the on-off of the switch tube in the inverter bridge driven by the drive circuit, and the output voltage of the bridge arm simulates the internal potential of the synchronous generator. L f and C ac They are the filter inductance and capacitor respectively. After LC filtering, the output voltage of the inverter simulates the terminal voltage of the synchronous generator. Through the disconnection of the public coupling point, IIDG can realize the switching between grid-connected and off-grid operation modes.

[0028] The frequency control of the IIDG refers to: Where: P is the active power output by the inverter port under VSG control, k is the damping coefficient, ω is the IIDG output angular frequency, ω grid is the angular frequency at the common coupling point, D is the active droop coefficient, H is the virtual inertia constant of the VSG, and 2H represents th...

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Abstract

The invention discloses a double-layer self-adaptive inertia control method and device for an inverter interfaced distributed generator (IIDG). The relation between the virtual inertia constant of VSG and the output angular frequency of the IIDG is obtained according to a control topological structure of the IIDG based on VSG, and then a small signal model is established, the actual operation scene is simulated through the small signal model, and control priority is selected by using a double-layer self-adaptive control strategy between power adjustment and frequency adjustment, and the IIDG is applicable for different operation scenes; and output stability and dynamic response speed can be taken into account, the operation performance of the system is improved effectively, and the control effect is strengthened.

Description

technical field [0001] The invention relates to a technology in the field of smart grids, in particular to a double-layer self-adaptive inertia control method and device for an inverter-type distributed power supply. Background technique [0002] With the continuous development of renewable energy power generation technology, distributed generator (DG) has become the main way for distribution network to utilize new energy. How to make full use of high-permeability DG and improve its stability is a key problem that needs to be solved urgently. Most of the DGs in the distribution network are inverter power sources, such as photovoltaics and energy storage. Inverter DG (Inverter interfaced DG, IIDG) has insufficient stability. Virtual synchronous generator (Virtual synchronous generator, VSG) technology can greatly improve the transient output characteristics of IIDG by simulating the inertia characteristics of synchronous generators and adding virtual inertia control links to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/48
CPCH02J3/48H02J2203/20Y02E10/56
Inventor 黄文焘邰能灵李美依余墨多
Owner SHANGHAI JIAO TONG UNIV