Coordinated voltage control method for alternating-current and direct-current hybrid power system

Abstract

The invention relates to a coordinated voltage control method for an alternating-current and direct-current hybrid power system, and belongs to the technical field of automatic voltage control for power systems. The coordinated voltage control method includes acquiring key operating measured values of a direct-current system and a near-field alternating-current system of the direct-current system; judging a current coordinated control state of the power system according to the operating measured values; performing tertiary optimal control computation and coordinated secondary optimal control computation on an integral power grid according to the coordinated control state; issuing computation results to systems of substations. The coordinated voltage control method has the advantages that an AVC (automatic voltage control) system can assuredly instantly perform the tertiary optimal control computation and the coordinated secondary optimal control computation on the integral power grid under the condition that operating modes of the direct-current system and the near-field alternating-current system are changed greatly, so that computation control strategies of the AVC system are assuredly coordinated with a current working condition of the alternating-current and direct-current hybrid power system, and unreasonable reactive flow in the power system can be prevented; the coordinated voltage control method can be integrated in the AVC system which is operated in fields, so that the voltage safety level of the alternating-current and direct-current hybrid power system can be enhanced.

Description

technical field [0001] The invention relates to a coordinated voltage control method for an AC / DC hybrid power system, in particular to a coordinated voltage control method for an UHV AC / DC hybrid power system with an adaptive adjustment control calculation cycle, and belongs to the technical field of automatic voltage control for power systems. Background technique [0002] Compared with AC transmission, DC transmission has the advantages of low line cost, low line loss, fast adjustment, reliable operation, saving transmission corridors, and no synchronous safety and stability problems. At the same time, it can limit the short-circuit current of large-area power grids and has certain overload ability to improve the stability of the AC system, especially the transient stability. In recent years, since the 1990s, my country has gradually carried out the construction of DC systems. my country's two major power grids, the State Grid and the China Southern Power Grid, have succe...

AI Technical Summary

Problems solved by technology

However, the current AVC system does not consider the coordination of DC system access. The access of DC system may cause a large change in the power flow distribution of the access power system in a short period of time, while the three-level and coordinated two-level voltage control of the conventional AVC system Calculated as cycle start, the cycle is hour and minute, and the change of the method that cannot adapt to the second-level time constant of the DC system will have an impact on the voltage regulation of the AC system in the near area

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