State Grid Ningxia Electric Power promotes the rectification of new energy high-voltage and high-frequency traversal capabilities

It is understood that State Grid Ningxia Electric Power Co.
, Ltd.
actively promotes the rectification and system protection construction of new energy high-voltage and high-frequency traversal capabilities, and has completed the transformation of 1.
3 times the withstand voltage capacity of 2.
08 million kilowatt wind turbines, and the transformation of high-frequency and high-voltage capabilities of photovoltaic power plants has been completed by 90%.

As the first new energy comprehensive demonstration zone in China, Ningxia's new energy has developed rapidly
in recent years.
At present, new energy has become the second largest power source in Ningxia Power Grid, accounting for more than 40% of installed capacity, and the proportion of electricity load occupied by the largest power generation output is close to 90%.

After the high proportion of new energy is concentrated and connected to the grid, it brings a series of new problems
such as the decrease of the system moment of inertia and subsynchronous oscillation.
At present, the relevant network-related technical standards for the resistance of high-voltage and high-frequency capabilities of new energy station power generation equipment are low, which is incompatible with the operation requirements of Ningxia's multi-DC transmission power grid, which not only limits the DC transmission capacity, but also has the risk
of system instability caused by large-scale chain off-grid of new energy in power grid operation.
In addition, there is a gap between the control of new energy and the control of conventional power supply, and the means of information perception and control are insufficient, which is difficult to adapt to the safe and stable operation control requirements
of the power grid with a high proportion of new energy.

In order to reduce the risk of new energy chain off-grid accidents caused by the failure of AC and DC equipment in the power grid, State Grid Ningxia Electric Power actively promotes the protection construction of Ningxia power grid system on the one hand, pilots the construction of panoramic monitoring of new energy stations, realizes rapid and accurate statistics on the amount of new energy off-grid and low-penetration power loss within 200 milliseconds after the occurrence of the fault, improves the whole process monitoring, perception ability and emergency control ability of the new energy station during the accident, and reduces the impact
of serious faults on the stable operation of the power grid 。 On the other hand, comprehensively promote the rectification of the high-frequency and high-voltage capacity of new energy stations, urge the Economic and Information Commission of the autonomous region to issue incentive and punishment measures to encourage new energy power generation enterprises to accelerate the technical transformation of power generation equipment, strengthen process control, report the degree of improvement on a monthly basis, increase the high-voltage traversal capacity of new energy stations to 1.
3 times the nominal voltage and the high-frequency resistance capacity to 51.
5 Hz, gradually realize the conventional power supply of new energy network-related performance, and fundamentally solve the problem of high-frequency and high-voltage off-grid of new energy stations during power grid
。

In the next step, State Grid Ningxia Electric Power will accelerate the rectification of high penetration capacity of new energy stations and the pilot construction of panoramic monitoring, ensure the smooth completion of Ningxia power grid system protection construction on schedule, ensure the safe and stable operation of Ningxia sending terminal DC group after the Shanghai Miao-Shandong UHVDC project is put into operation, and improve the new energy absorption capacity of Ningxia power grid and the intrinsic safety level of
the power grid.