Energy storage planning method for improving characteristics of AC-DC hybrid power system

Abstract

The invention provides an energy storage planning method for improving the characteristics of an AC/DC hybrid power system, and the method comprises the steps: calculating the energy storage configuration capacity based on emergency active power support for a single-feed-in DC system; carrying out power grid side energy storage stationing and capacity optimization based on dynamic reactive power compensation according to the energy storage configuration capacity measurement and calculation result supported by the emergency active power; obtaining an energy storage configuration capacity optimization result of each DC line; and comprehensively measuring and calculating the energy storage configuration capacity of the multi-infeed direct current system based on the energy storage configuration capacity optimization result of each direct current line to obtain an optimal energy storage configuration range for improving the fault recovery characteristic of the alternating current and direct current hybrid operation system. According to the method, the energy storage capacity can be reasonably configured, the fault recovery characteristic of the AC-DC hybrid power system is improved, the stable operation capability of the system is improved, peak regulation and frequency modulation, new energy consumption and other system requirements of the power system are considered, and theoretical and data support is provided for power grid side energy storage planning and expected development scale of a regional power grid.

Description

technical field [0001] The invention relates to the technical field of power grids, in particular to an energy storage planning method for improving the characteristics of an AC / DC hybrid power system. Background technique [0002] With the continuous development of domestic high-voltage DC transmission technology and the continuous advancement of DC transmission projects, the AC-DC hybrid power system poses new challenges to the stable operation of the system. Especially in the AC power system with multi-infeed DC, the mutual influence between the two during operation is more obvious. For example, a fault on the AC side line may cause multiple DC lines to fail commutation at the same time or even cause DC blocking, and the failure of DC commutation may in turn cause transient voltage instability in the AC system and large power loss in the AC system caused by multiple DC blocking Otherwise, the AC system frequency may become unstable. [0003] The existing technologies fo...

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Problems solved by technology

[0004] However, some existing technical solutions are difficult to meet the large demand for active and reactive power of the system after a DC fault, and it is difficult to effectively suppress the system frequency drop; some existing technical solutions do not take into account the different degrees of overlap between various benefits , there are many invisible benefits that are difficult to accurately quantify and calculate, and from the current energy storage cost, the energy storage configuration capacity aimed at economic benefits is difficult to meet the actual needs of the AC-DC hybrid operation power system; some

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