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VSG based photovoltaic microgrid dynamic frequency stability control method

A stable control method and dynamic frequency technology, applied in photovoltaic power generation, single grid parallel feeding arrangement, reducing/preventing power oscillation, etc.

Active Publication Date: 2019-06-07
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • VSG based photovoltaic microgrid dynamic frequency stability control method
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  • VSG based photovoltaic microgrid dynamic frequency stability control method

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Embodiment Construction

[0070] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments.

[0071] Concrete steps of the present invention are as follows:

[0072] (1) VSG control method and control model

[0073] (1-1) VSG active power control

[0074] The traditional simple VSG system consists of an ideal DC voltage source and an inverter. The inverter simulates a synchronous generator and provides virtual inertia for the system to achieve the purpose of frequency regulation. In the present invention, the ideal DC voltage source is replaced by a photovoltaic power source to form a photovoltaic power generation system. The system struct...

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Abstract

The invention discloses a VSG based photovoltaic microgrid dynamic frequency stability control method. The method includes the following steps: constructing a VSG based photovoltaic microgrid system dynamic model; performing adaptive control on the virtual inertia torque and virtual damping factors of the system model; configurating system key parameters, and selecting the optimal value of the parameters; and determining a calculation example, and adopting a simulation tool to perform simulation analysis on the calculation example. The method can establish the dynamic relation between the virtual inertia and virtual damping of a system and the frequency change of the system through the analysis on a frequency oscillation process, so that the two can be adaptively changed according to the frequency change, and therefore, frequency oscillation can be effectively inhibited, the system can better cope with transient disturbances, and the frequency stability of the system can be provided.

Description

technical field [0001] The invention relates to the field of micro-grid frequency control, in particular establishes the relationship between system virtual inertia and virtual damping and system frequency, and proposes a parameter adaptive control method, which can improve the ability of the system to suppress frequency oscillation. 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 penetration rate of distributed power genera...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02J3/38
CPCY02E10/56
Inventor 殷桂梁董浩代亚超王珊珊王硕
Owner YANSHAN UNIV
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