Virtual synchronous generator control method and system by considering dynamic characteristics of photovoltaic power supply

Abstract

The invention discloses a novel virtual synchronous generator control method and system by considering dynamic characteristics of a photovoltaic power supply. The method comprises the steps as follows: the photovoltaic power supply is dynamically analyzed; a feasible stable operation region of the photovoltaic power supply is obtained; and a core control unit ensures that the photovoltaic power supply runs in the feasible stable operation region. According to the method and the system disclosed by the invention, the photovoltaic power supply is directly combined with a virtual synchronous generator, so that the disadvantage that a traditional method also needs an energy storage battery for cooperation is avoided. The dynamic characteristics of the photovoltaic power supply are fully considered by the method, so that the photovoltaic power supply constantly runs in the stable region; a control variable obtained by considering the dynamic characteristics of the photovoltaic power supply is applied to the virtual synchronous generator in a form of the additional core control unit; and good combination of the photovoltaic power supply and the virtual synchronous generator is achieved. According to the method, the characteristics of the photovoltaic power supply are fully considered; excellent performance of the virtual synchronous generator is developed; meanwhile, the grid connection cost of the photovoltaic power supply is saved; and development and popularization of photovoltaic power generation are facilitated.

Description

technical field [0001] The invention relates to the technical field of new energy power generation control, in particular to a novel virtual synchronous generator control method and system considering the dynamic characteristics of photovoltaic power sources. Background technique [0002] Energy plays an important role in promoting social development. As a clean and efficient energy form, electricity is related to the national economy and people's livelihood. In response to the energy crisis and environmental pressure, distributed energy such as wind energy and solar energy has received more and more attention. [0003] Vigorously developing distributed power generation is of great significance in improving the economics of power grid operation, optimizing the operation mode of the power system, and building an environment-friendly power system. In July 2015, the "Guiding Opinions on Promoting the Development of Smart Grid" promulgated by the National Development and Refor...

AI Technical Summary

Problems solved by technology

However, the traditional virtual synchronous generator control method is mainly aimed at the case of constant power supply on the DC side, and its application range is limited

The output of photovoltaic power is affected by environmental factors such as light intensity and temperature, and has strong randomness, uncertainty and limitation. Its DC side voltage also fluctuates, so it is difficult to directly connect photovoltaic power with traditional virtual synchronous generators into the grid

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