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Radial direct-current power grid stability judgment method and system

A DC power grid and stability technology, applied in the field of radial DC grid stability judgment, can solve problems such as massive modeling and calculation of DC power grids, heavy power grid modeling workload, and complex systems

Active Publication Date: 2015-12-02
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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Problems solved by technology

However, with the continuous access of DC power sources and loads, the system will become more and more complex, and the workload of modeling the entire power grid will increase. The analysis of the stability of the DC power grid requires a large number of modeling calculations

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  • Radial direct-current power grid stability judgment method and system
  • Radial direct-current power grid stability judgment method and system
  • Radial direct-current power grid stability judgment method and system

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Embodiment Construction

[0030] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The drawings show preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The term "or / and" as used herein includes any and all combinations of one or more re...

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Abstract

The invention relates to a radial direct-current power grid stability judgment method and system. The method includes the following steps of: obtaining the type of an AC / AC converter; modeling the AC / AC converter according to the type of the AC / AC converter so as to obtain the output voltage of the AC / AC converter; judging the stability of the output voltage according to Nyquist stability criterion; and judging the stability of a radial direct-current power grid according to the judgment result of the stability of the output voltage. According to the radial direct-current power grid stability judgment method and system of the invention, the AC / AC converter is modeled, so that the output voltage of the AC / AC converter can be obtained; the stability of the output voltage is judged according to Nyquist stability criterion; and the stability of the radial direct-current power grid can be judged according to the judgment result of the stability of the output voltage. Modeling for the whole power grid is not required, and therefore, the judgment method of the stability of the radial direct-current power grid can be effectively simplified.

Description

Technical field [0001] The invention relates to the field of power system stability analysis, in particular to a method and system for judging the stability of a radial DC power grid. Background technique [0002] With the rapid development of distributed renewable energy such as photovoltaics and wind power and the large number of DC loads such as electric vehicles and LEDs, in order to improve transmission, distribution, power efficiency, power supply reliability and power quality, and alleviate the shortage of power transmission and distribution corridors, etc. The problem is that the demand for using flexible DC technology to build a power grid is becoming increasingly urgent. However, due to the widespread use of power electronic converters in the DC grid, there are interactions between different converters, which may even cause the DC grid to fail to operate stably in severe cases. [0003] figure 1 It is a schematic diagram of a DC grid with a radial structure. The radial ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/10
Inventor 李巍巍黎小林许树楷
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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