An over-limit correction control method for AC-DC hybrid grid with flexible DC

Abstract

The present invention relates to an alternating current / direct current hybrid power grid out-of-limit correction control method comprising direct current. The method comprises: obtaining alternating current / direct current hybrid power grid parameters and power grid operation state data after failure, determining whether the alternating current / direct current hybrid power grid has active out-of-limit or not, if the alternating current / direct current hybrid power grid has active out-of-limit, establishing an active correction model, regulating the active power control values of a generator set and a direct current system and performing active correction control, if the alternating current / direct current hybrid power grid have no active out-of-limit, determining whether the alternating current / direct current hybrid power grid has reactive out-of-limit or not, and if the alternating current / direct current hybrid power grid has reactive out-of-limit, establishing a reactive correction model, regulating generator reactive power, a transformer tap, capacitor shifts and the reactive power control value of the direct current system, and performing reactive correction control. The problem is solved that the correction strategy based on the sensitivity method can cause new out-of-limit, and the method provided by the invention has good adaptability for single out-of-limit and multiple out-of-limit.

Description

technical field [0001] The invention relates to the technical field of power system operation analysis, in particular to a method for over-limit correction and control of an AC-DC hybrid power grid with flexible DC. Background technique [0002] With the continuous development and maturity of fully-controlled power electronic devices such as IGBTs, Voltage Source Converter High Voltage Direct Current (VSC-HVDC) based on voltage source converters has become the development direction of the next generation of DC transmission. . The converter adopts a plurality of sub-modules in series to form a converter valve, and adopts the nearest level approximation modulation strategy, so that the converter can independently control the transmission direction of active power and reactive power, which greatly enhances the flexibility of power grid operation control . [0003] With the gradual popularization and application of flexible DC transmission technology in power systems, the oper...

AI Technical Summary

Problems solved by technology

The currently disclosed methods only consider the correction of faults exceeding the limit by adjusting the output of the generating set and shedding the load in terms of control means, and do not consider the participation of flexible DC in the correction control; the calculation method of the control strategy is often based on transfer sensitivity, and does not consider the impact of control measures on The overall impact of the power grid may cause new limit violations in the correction control results

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