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Control method for self-adaptive virtual synchronous machine of hybrid microgrid converter

A virtual synchronous machine and hybrid microgrid technology, applied in AC network circuits, single-grid parallel feeding arrangements, reducing/preventing power oscillations, etc., can solve the problem of inability to suppress AC/DC microgrid power oscillations

Active Publication Date: 2021-03-09
XIAN THERMAL POWER RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the conventional VSG control, the virtual parameter is a fixed value, which cannot suppress the power oscillation during the power exchange process of the AC-DC microgrid.

Method used

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  • Control method for self-adaptive virtual synchronous machine of hybrid microgrid converter
  • Control method for self-adaptive virtual synchronous machine of hybrid microgrid converter
  • Control method for self-adaptive virtual synchronous machine of hybrid microgrid converter

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Embodiment Construction

[0048] The technical solution of the present invention will be described in further detail below with reference to the accompanying drawings.

[0049] Such as figure 1 As shown, the AC subnet and the DC subnet are connected through one or more AC / DC converters, and the AC / DC hybrid microgrid is connected to the distribution network through a power transformer. This kind of microgrid topology can be applied to distributed power supply and where the load is concentrated.

[0050] Such as figure 2 shown,; R f , L f 、C f Resistor, inductance and capacitance of the filter circuit; e abc is the bridge arm voltage on the AC side of the converter; u abc i abc is the AC side voltage and current; Z ac is the line impedance.

[0051] The power transfer equation on the AC side of the AC / DC converter can be expressed as:

[0052]

[0053] In formula (1): R f 、X f is the resistance value and inductance value of the filter circuit; E is the voltage amplitude of the AC side br...

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Abstract

The invention discloses an adaptive virtual synchronous machine control method for a hybrid microgrid converter, and the method employs an adaptive virtual moment of inertia J and an adaptive virtualdamping D in a VSG control system, and achieves the inhibition of the power fluctuation of the hybrid microgrid AC / DC converter. Furthermore, in order to obtain a rated virtual parameter value range,a small signal model is established for the self-adaptive VSG control system, and the damping ratio and the rated damping coefficient are obtained by analyzing the characteristic value of the small signal model and referring to the oscillation angular frequency value of the synchronous generator. According to the method, adaptive virtual rotational inertia J and adaptive virtual damping D are adopted in a VSG control system, and in the angular frequency increasing stage, J is increased, and D is properly reduced at the same time; in the angular frequency reduction stage, J is reduced, and meanwhile, D is properly increased through the double-virtual-parameter self-adaptive control scheme. The system response speed can be ensured, and the power is accelerated to enter a stable state. The dual adaptive virtual parameters can effectively suppress power fluctuation.

Description

technical field [0001] The invention relates to a control method for an adaptive virtual synchronous machine of a hybrid microgrid converter. The method adopts double self-adaptive parameters to improve the power adjustment capability of the virtual synchronous machine control system of the hybrid microgrid converter, and controls the self-adaptive virtual synchronous machine The system establishes a small-signal model to analyze the value of the rated virtual parameters. Background technique [0002] The AC-DC hybrid microgrid is composed of an AC subnet, a DC subnet and an AC / DC interface converter. The AC-DC hybrid microgrid is an advanced form of microgrid development in the future. It combines the advantages of both the AC microgrid and the DC subnet. Enhanced the flexibility of multiple different types of micro-power sources and various types of loads connected to the micro-grid system. AC / DC interface converters, as the power transmission medium for AC subnets and DC ...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/24H02J5/00
CPCH02J3/381H02J3/24H02J5/00H02J2203/20H02J2300/10H02J2300/24H02J2300/28H02J2300/40Y02E10/56
Inventor 冯仰敏杨沛豪赵勇李立勋张宝锋王燕
Owner XIAN THERMAL POWER RES INST CO LTD
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