A photovoltaic oscillation stabilization method and system based on a virtual synchronous generator

A photovoltaic system and virtual synchronization technology, applied in photovoltaic power generation, reducing/preventing power oscillation, electrical components, etc., can solve problems such as poor economy and practicability, improve dynamic stability, enhance system damping loop, and optimize system structure Effect

Active Publication Date: 2020-10-09
YANSHAN UNIV
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Problems solved by technology

However, the algorithm is not economical and practical for complex microgrids.

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  • A photovoltaic oscillation stabilization method and system based on a virtual synchronous generator
  • A photovoltaic oscillation stabilization method and system based on a virtual synchronous generator
  • A photovoltaic oscillation stabilization method and system based on a virtual synchronous generator

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Embodiment Construction

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0046] The purpose of the present invention is to provide a photovoltaic oscillation stabilization method and system based on a virtual synchronous generator, so that the simulated inertia value and virtual damping can be adaptively changed in real time during oscillation, and further suppress the frequency oscillation of the system.

[0047] In order to make the above objects, features and advantages of the present invention more comprehensible, the present in...

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Abstract

The invention discloses a photovoltaic oscillation stabilization method and system based on a virtual synchronous generator. The method comprises steps of creating a photovoltaic system dynamic model;acquiring adaptive drooping power and drooping sensitivity coefficient; according to the adaptive drooping power, optimizing virtual damping of the photovoltaic system dynamic model, so as to obtainoptimized virtual damping; building a correspondence relationship between virtual inertia of a DC side capacitor of the photovoltaic system dynamic model and frequency and frequency change ratio of the photovoltaic system dynamic model, and optimizing the virtual inertia of the photovoltaic system dynamic model, so as to obtain optimized virtual inertia; and according to the optimized virtual damping and optimized virtual inertia, stabilizing photovoltaic oscillation of the photovoltaic system dynamic model. The photovoltaic system can change system parameters in real time according to frequency change, so that the system structure is optimized, and dynamic stability of the photovoltaic system is improved.

Description

technical field [0001] The invention relates to the field of photovoltaic power generation, in particular to a photovoltaic oscillation stabilization method and system based on a virtual synchronous generator. Background technique [0002] In recent years, with the continuous improvement of the penetration rate of photovoltaic power supply, solar energy has been integrated into the grid, which has greatly slowed down the global energy crisis and reduced greenhouse gas emissions. However, traditionally, photovoltaic generators do not have any rotating mass and cannot provide inertial response at all, which reduces the system stability when the power grid is disturbed and seriously hinders the connection of large-scale photovoltaic power sources to the power grid. [0003] In order to improve the inertia of the photovoltaic system, Professor VisscherK proposed the concept of virtual synchronous machine at the "SmartGrids for Distribution" conference, which can make the inverte...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/24
CPCH02J3/002H02J3/24H02J3/383H02J2203/20Y02B10/10Y02E10/56
Inventor 殷桂梁董浩代亚超李云雷韩运泽
Owner YANSHAN UNIV
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