mmc-hvdc black start simulation test system and test method

Abstract

The invention relates to an MMC-HVDC black start simulation test system and a test method. The method comprises the following steps: first, disconnecting a simulation test switch to simulate power loss of one grid, and disconnecting two circuit breakers corresponding to two grids; then, charging and starting two MMCs; and finally, after the alternating voltage output by the MMC corresponding to the grid losing power is stabilized, detecting the voltage amplitude and phase of the second grid and locking the voltage phase of the second grid, and when the voltage phase of the second grid is consistent with the phase of the alternating voltage output by the second MMC, making the second circuit breaker closed and connected to the grid, thus realizing simulation test of black start. Through the test method, black start of a grid under the condition of failure can be simulated, MMC-HVDC black start can be effectively controlled, and the black start performance of a flexible DC transmission system can be studied to provide guidance for product development and engineering implementation of a converter and control protection system.

Description

technical field [0001] The invention relates to an MMC-HVDC black start simulation test system and a test method. Background technique [0002] With the development of fully-controlled power electronic devices and the application of power electronics technology in power systems, the Voltage-Sourced Converter High Voltage Direct Current (VSC-HVDC) technology based on voltage source converters has attracted increasing attention. Modular Multilevel Converter (MMC, Modular Multilevel Converter) is a kind of voltage source converter in the application of flexible direct current transmission system. It is widely used in flexible direct current transmission and new energy access systems due to its remarkable advantages. [0003] The research on using VSC-HVDC as the black start power supply to realize the black start of power grid has attracted extensive attention. The so-called black start means that after the entire system is out of service due to a fault, the system is complete...

AI Technical Summary

Problems solved by technology

[0004] First of all, the research on the black start capability of MMC in the prior art is still in its infancy, and the existing black start methods using MMC are all in the real MMC-HVDC power transmission system. It can be shown whether the startup method is correct or not after it has been implemented in the power transmission system, but if the startup method is wrong, it will not only cause the failure of the black start, because the black startup method in the real MMC-HVDC power transmission system Therefore, once the black start fails, there will be a large-scale power outage in the power supply area, which will cause huge economic losses to the production of enterprises and bring great inconvenience to the daily life of residents.

Images