Grid access simulation test system for inverter

Abstract

The invention relates to a grid access simulation test technology for an inverter, and discloses a grid access simulation test system for an inverter. The grid access simulation test system for an inverter comprises a host computer simulation subsystem, a digital simulation subsystem, a physical simulation subsystem, an inverter and an interface subsystem, wherein the host computer simulation subsystem is connected with the digital simulation subsystem; the digital simulation subsystem is connected with the inverter through the interface subsystem; the inverter is also connected with the physical simulation subsystem; the host computer simulation subsystem is used for monitoring an on-line monitoring simulation test process; the digital simulation subsystem is used for performing digital real time simulation of a power grid according to a power grid model; the physical simulation subsystem is used for performing physical simulation of power generation equipment according to a model for the power generation equipment; and the interface subsystem is used for performing power conversion of interactive signals between the digital simulation subsystem and the inverter. Therefore, the inverter can be tested more comprehensively, and at the same time the test environment gets closer to the actual environment and the test result is more accurate.

Description

technical field [0001] The invention relates to an inverter grid-connection simulation test technology, in particular to an inverter grid-connection simulation test system. Background technique [0002] Among many renewable energy sources, solar energy is favored by its unique advantages, and photovoltaic power generation has become an important part of the domestic renewable energy development strategy. However, due to its power generation characteristics different from conventional power sources, the output power fluctuates greatly, and there are still many technical problems to be overcome when it is connected to the power grid: for example, the planning, operation, and control of the large-scale connection of distributed photovoltaic It brings new challenges; it is difficult to verify the function and performance of the new inverter topology in digital simulation. Therefore, the modeling and simulation research of photovoltaic inverter grid connection has become an impo...

AI Technical Summary

Problems solved by technology

[0007] (1) The grid simulator simulates a simple power supply, only the voltage and frequency of the grid, and the grid simulator cannot simulate the complex and changeable characteristics of the real grid

[0008] (2) The power grid simulator cannot test the impact of the photovoltaic power generation system on the real complex power grid

[0009] (3) The platform cannot test the impact of a specific disturbance in the electric (micro) grid on the photovoltaic system

[0010] (4) The platform cannot test the interaction of other controllers and physical photovoltaic inverter equipment in the power (micro) grid

[0017] (1) The hardware circuit of the photovoltaic inverter adopts a pure digital model, but for the physical phenomenon of the photovoltaic power generation system, the closing and opening process of the power electronic device inside the inverter is a fast dynamic characteristic, and its digital modeling is still not accurate enough

[0018] (2) Both the photovoltaic panel and the grid side adopt pure digital models, and the reliability of the simulation test results of the grid connection characteristics of the photovoltaic inverter is not high enough, and the deviation from the actual situation is large

[0019] (3) The test platform is still unable to fully verify the network connection characteristics of a physical photovoltaic inverter, and can only partially verify the functions of the inverter controller

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