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A self-adaptive vsg microgrid inverter control method and system

A control method and self-adaptive technology, applied in the self-adaptive VSG microgrid inverter control method and system field, can solve the problems of frequency change rate introduction and other problems, and achieve the effect of enhancing frequency stability and increasing adjustment speed

Active Publication Date: 2021-11-23
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Similarly, some researchers jointly controlled two virtual parameters, but did not introduce the rate of change of the frequency into the value of the parameter

Method used

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  • A self-adaptive vsg microgrid inverter control method and system
  • A self-adaptive vsg microgrid inverter control method and system
  • A self-adaptive vsg microgrid inverter control method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1 embodiment of the disclosure provides an adaptive control method VSG micro inverter grid, comprising the steps of:

[0041] Get VSG microgrid inverter operating-state data;

[0042] The operating-state data acquired to obtain the frequency offset, the frequency change rate and a frequency change within a predetermined time, and then get the adaptive virtual inertia coefficient;

[0043] The adaptive damping coefficient obtained frequency offset and the frequency change rate obtained;

[0044] Virtual electrical angle adjustment and adaptation inertial damping coefficient according to the adaptive obtained.

[0045] Specifically, it includes the following:

[0046] S1: The basic principle of VSG

[0047]According to the stator electrical equation of the synchronous generator, the relationship between the internal electrical and magnet is not considered, in order to simplify the calculation, the second order equation of the synchronous generator is analyzed. According to th...

Embodiment 2

[0130] The present disclosure provides an adaptive VSG microglink inverter control system, including:

[0131] The data acquisition module is configured to obtain the operating status data of the VSG microglink inverter;

[0132] The adaptive virtual inertial coefficient calculation module is configured to: obtain the frequency variation in frequency offset, frequency change rate, and preset time according to the acquired operating state data, which in turn obtains adaptive virtual inertial coefficient;

[0133] The adaptive damping coefficient calculation module is configured to obtain an adaptive damping coefficient based on the resulting frequency offset and frequency change rate;

[0134] The control module is configured to electrodely adjust the electrical angle based on the obtained adaptive virtual inertial coefficient and the adaptive damping coefficient.

[0135] The working method of the system is the same as the adaptive VSG micro-grid inverter control method provided i...

Embodiment 3

[0137] Embodiment 3 of the present disclosure provides a medium that stores a program that implements an adaptive VSG microgrid inverter control method according to Embodiment 1 of the present disclosure, which is executed by a processor. Step is:

[0138] Get the operating status data of the VSG micro-grid inverter;

[0139] According to the acquired operating status data, the frequency variation in the frequency offset, the frequency change rate, and the preset time is obtained, and the adaptive virtual inertial coefficient is obtained.

[0140] Adaptive damping coefficients are obtained based on the resulting frequency offset and frequency change rate;

[0141] Electrical angle adjustment is performed based on the obtained adaptive virtual inertial coefficient and the adaptive damping coefficient.

[0142] The detailed steps are the same as the adaptive VSG microglinal inverter control method provided in Example 1, and details are not described herein again.

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Abstract

The present disclosure provides an adaptive VSG microgrid inverter control method and system, the method comprising the following steps: acquiring the operating state data of the VSG microgrid inverter; obtaining the frequency offset according to the acquired operating state data , frequency change rate and frequency change within the preset time, and then get the adaptive virtual inertia coefficient; get the adaptive damping coefficient according to the obtained frequency offset and frequency change rate; according to the obtained adaptive virtual inertia coefficient and adaptive The damping coefficient is adjusted by electrical angle; this disclosure selects the inertia and damping coefficients according to the frequency offset, frequency change rate and preset conditions, and the virtual inertia coefficient can be increased or decreased for different working conditions, while in the system The inertia coefficient remains unchanged within the stable range, and the change of the virtual damping coefficient is controlled by an exponential function, which enhances the frequency stability of the system.

Description

Technical field [0001] The present disclosure relates to an inverter control VSG microgrid technology, and particularly relates to an adaptive VSG micro inverter control method and system power. Background technique [0002] The statement of this section is merely the background technology related to the present disclosure, and it is not necessarily constituting the prior art. [0003] Micro grid interface link inverter as a load connected to the local distributed power, the performance of the entire micro grid plays a vital role, since the power electronic devices themselves do not have "inertia" and "damping" and other characteristics, when At higher penetration of distributed power, the performance of the system will have been affected; at the same time, conditions will be different for different interface requirements of the inverter, which have increased the autonomous operation of the inverter and "plug and play" difficulty. To solve these problems, scholars have introduced...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02M7/48
CPCH02J3/381H02M7/48H02J2300/20
Inventor 杜春水施其国孙永超郭文琛张洪亮
Owner SHANDONG UNIV
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