The information security of relay protection equipment is related to the safe and reliable operation of power grid. With the diversification of network security attacks, the existing security protection means of relay protection equipment cannot meet the security protection requirements of the new generation of substations. By analyzing the information security risk points of relay protection equipment in substation, the security protection requirements of relay protection equipment such as identity authentication, security audit, access control, data security, communication security, security reinforcement are studied, and targeted test methods are proposed to guide the development and testing of the new generation of relay protection equipment in the substation. It has effectively improved the information security protection level of relay protection equipment.
In order to test and verify the power control characteristics and fault characteristics of flexible DC grid based on MMC, a
physical platform of single ended flexible converter valve is developed. The platform adopts the pseudo bipolar connection
form to form a two terminal transmission structure with the DC power supply. The sub module adopts half bridge MMC,
and multiple fault points are configured on the AC and DC sides, which can create different types of faults. Based on the
physical platform of single station flexible DC converter valve, the normal operation, power step and simulated fault tests
are carried out. The test results show that the platform meets the test requirements of power control characteristics and
fault characteristics of flexible DC grid.
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