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Self-adaptive VSG microgrid inverter control method and system

A control method and self-adaptive technology, applied in the field of self-adaptive VSG microgrid inverter control method and system, can solve the problem of introducing the rate of change of frequency, and achieve the purpose of eliminating measurement error, increasing adjustment speed, and enhancing frequency stability. Effect

Active Publication Date: 2020-11-06
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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  • Self-adaptive VSG microgrid inverter control method and system
  • Self-adaptive VSG microgrid inverter control method and system
  • Self-adaptive VSG microgrid inverter control method and system

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Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1 of the present disclosure provides an adaptive VSG microgrid inverter control method, including the following steps:

[0041] Obtain the operating status data of the VSG microgrid inverter;

[0042] According to the obtained operating state data, the frequency offset, frequency change rate and frequency change within the preset time are obtained, and then the adaptive virtual inertia coefficient is obtained;

[0043] Obtain an adaptive damping coefficient according to the obtained frequency offset and frequency change rate;

[0044] The electrical angle is adjusted according to the obtained adaptive virtual inertia coefficient and adaptive damping coefficient.

[0045] In detail, include the following:

[0046] S1: Fundamentals of VSG

[0047] According to the electrical equation of the stator of the synchronous generator, the second-order equation of the synchronous generator is used for analysis in order to simplify the calculation without considering th...

Embodiment 2

[0130] Embodiment 2 of the present disclosure provides an adaptive VSG microgrid inverter control system, including:

[0131] The data acquisition module is configured to: acquire the operation status data of the VSG microgrid inverter;

[0132] The adaptive virtual inertia coefficient calculation module is configured to: obtain the frequency offset, the frequency change rate and the frequency change within a preset time according to the obtained operating state data, and then obtain the adaptive virtual inertia coefficient;

[0133] The adaptive damping coefficient calculation module is configured to: obtain the adaptive damping coefficient according to the obtained frequency offset and frequency change rate;

[0134] The control module is configured to: perform electrical angle adjustment according to the obtained adaptive virtual inertia coefficient and adaptive damping coefficient.

[0135] The working method of the system is the same as the control method of the self-ada...

Embodiment 3

[0137] Embodiment 3 of the present disclosure provides a medium on which a program is stored, and when the program is executed by a processor, the steps in the adaptive VSG microgrid inverter control method described in Embodiment 1 of the present disclosure are implemented, the The steps are:

[0138] Obtain the operating status data of the VSG microgrid inverter;

[0139] According to the obtained operating state data, the frequency offset, frequency change rate and frequency change within the preset time are obtained, and then the adaptive virtual inertia coefficient is obtained;

[0140] Obtain an adaptive damping coefficient according to the obtained frequency offset and frequency change rate;

[0141] The electrical angle is adjusted according to the obtained adaptive virtual inertia coefficient and adaptive damping coefficient.

[0142] The detailed steps are the same as the control method of the self-adaptive VSG microgrid inverter provided in Embodiment 1, and will ...

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Abstract

The invention provides a self-adaptive VSG micro-grid inverter control method and system. The method comprises the following steps: obtaining operation state data of a VSG micro-grid inverter; obtaining a frequency offset, a frequency change rate and a frequency change amount in a preset time according to the obtained operation state data, and further obtaining an adaptive virtual inertia coefficient; obtaining an adaptive damping coefficient according to the obtained frequency offset and frequency change rate; and according to the obtained self-adaptive virtual inertia coefficient and the self-adaptive damping coefficient, performing electrical angle adjustment. According to the invention, inertia and damping coefficients are selected according to the frequency offset, the frequency change rate and preset conditions; the virtual inertia coefficient can be increased or decreased for different working conditions, the inertia coefficient is not changed within the stable range of the system, meanwhile, the change of the virtual damping coefficient is controlled through the exponential function, and the frequency stability of the system is enhanced.

Description

technical field [0001] The present disclosure relates to the technical field of VSG microgrid inverter control, in particular to an adaptive VSG microgrid inverter control method and system. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] The microgrid interface inverter is the link between the distributed power supply and the local load. When the penetration rate of distributed power sources is high, it will have a certain impact on the performance of the system; at the same time, the requirements for the interface inverters will also be different under different working conditions, which increases the risk of autonomous operation of the inverters. "Plug and play" difficulty. In response to the above problems, scholars have introduced the working mechanism of synchronous generators. By improving the control algorithm, the interface in...

Claims

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Application Information

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Patent Type & Authority Applications(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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