Line impedance simulation method of inverter system based on starting impedance angle

Abstract

The invention discloses a line impedance simulation method of an inverter system based on a starting impedance angle. The method comprises the following steps: sampling the current of a capacitance output end of a three-phase LC filter of an inverter, obtaining a dq axis component of the current of the capacitance output end of the three-phase LC filter according to a coordinate transformation equation, obtaining a sine value and a cosine value of the starting impedance angle corresponding to the line impedance to be simulated through a starting impedance angle equation, and achieving a simulation function of the line impedance of the inverter system through a line impedance simulation equation. According to the line impedance simulation method of the inverter system based on the startingimpedance angle disclosed by the invention, a feasible basis is provided for the construction of a micro power grid, the research on the load demand of a distributed power generation system is facilitated, meanwhile, no additional power electronic equipment needs to be added to the inverter system, the power consumption is reduced, and the cost is reduced.

Description

technical field [0001] The invention belongs to the field of power quality analysis and control, and in particular relates to a method for simulating line impedance of an inverter system based on an initial impedance angle. Background technique [0002] In recent years, the global climate problem has become increasingly serious, and the greenhouse effect caused by excessive carbon dioxide emissions has begun to attract people's attention. Therefore, the state vigorously develops renewable energy technology and takes it as an important part of the new energy development strategy to solve the problems of traditional energy consumption. [0003] As a concept that has emerged in recent years, micro-grids have been highly valued by the country and the government, and micro-grids and distributed power projects have been put into construction everywhere. It has also become an urgent issue to carry out scientific and systematic research on the microgrid and overcome the problems of...

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Problems solved by technology

[0009] 1. There is little research on the method of line impedance simulation. In order to better evaluate the feasibility of micro-grid construction, meet the load demand of distributed power generation, and improve the utilization rate of high-penetration new energy power generation systems, it is necessary to conduct in-depth and comprehensive Study the control method of line impedance simulation;

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