A transient adaptive parameter control strategy for microgrid based on VSG

A technology of self-adaptive parameters and control strategies, applied in circuit devices, AC network circuits, reducing/preventing power oscillation, etc., can solve the problems of difficulty in frequency fluctuation, real-time change of system structure parameters, etc., to optimize system structure and achieve self-adaptation Change, prevent too large or too small effects

Active Publication Date: 2019-01-04
YANSHAN UNIV
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Problems solved by technology

However, the adaptive adjustment of parameters is rarely involved, which makes it impossible for the system to change the system structural parameters in real time according to the change of the system frequency, so it is difficult to use the existing method to suppress the frequency fluctuation caused by the power fluctuation of the system

Method used

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  • A transient adaptive parameter control strategy for microgrid based on VSG
  • A transient adaptive parameter control strategy for microgrid based on VSG
  • A transient adaptive parameter control strategy for microgrid based on VSG

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Embodiment

[0084] The specific steps of the technical solution of the present invention are as follows:

[0085] (1) VSG control strategy and control model

[0086] (1-1) Build a traditional microgrid system model based on VSG

[0087] Such as figure 1 As shown, in the traditional VSG control system, renewable energy such as wind energy and solar energy can be connected to the grid through the DG; the DG power module adopts droop control and is connected to the LC filter after the inverter; the filter is composed of an inductor Component L f and capacitive element C f Reasonable adjustment of its parameters can reduce the influence of ripple in the measured output power;

[0088] A VSG-based microgrid system dynamic model is constructed; among them, the microgrid system dynamic model is a typical second-order model of a virtual synchronous generator based on virtual inertia torque and virtual damping factor:

[0089]

[0090] Δδ=δ 1 -δ ref =∫(ω-ω ref ) dt (2)

[0091]

[0...

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Abstract

The invention discloses a microgrid transient adaptive parameter control strategy based on VSG, belonging to the field of microgrid frequency control. The invention comprises the following steps: a dynamic model of a microgrid system based on VSG is constructed; The virtual inertial torque and virtual damping factor of the system model are controlled adaptively. The stability of the system energyfunction is evaluated. Matlab / simulink software is used to simulate and analyze the numerical example. By analyzing the frequency oscillation process, the method of the invention establishes the dynamic relationship between the system inertia and the system frequency offset, and changes the virtual inertia factor in real time according to the frequency change, thereby effectively suppressing the frequency oscillation, enabling the system to better cope with the transient disturbance and providing the system frequency stability.

Description

technical field [0001] The present invention relates to the field of microgrid frequency control, especially constructs the relationship between system frequency and system virtual inertia and virtual damping, and proposes a transient adaptive parameter control strategy, which can solve the problem of frequency oscillation caused by power fluctuations in the system . Background technique [0002] Distributed Generation (DG) is mainly divided into renewable energy power generation, non-renewable energy power generation and energy storage technology power generation. Renewable energy power generation includes small hydropower (10kW ~ 100MW), wind power, photovoltaic power generation, geothermal power generation, etc. Non-renewable energy power generation includes micro gas turbine power generation and fuel cell power generation, and energy storage technology includes supercapacitor and flywheel energy storage technology. [0003] In recent years, with the increasing penetrati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
CPCH02J3/24H02J2203/20
Inventor 殷桂梁董浩赵晓龙陈建华
Owner YANSHAN UNIV
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