A coordinated control method for power grid security and stability considering the access of virtual synchronous generators

Abstract

The invention discloses a coordination control method considering virtual synchronous generator access for power grid safety and stability and belongs to the technical field of a power system and automation thereof. The method comprises the following steps: a new energy collection station control substation calculates actual regulation amount of each virtual synchronous generator according to up-sent information of a virtual synchronous generator execution station, if the total amount of the actual regulation amounts of the virtual synchronous generators is smaller than a total amount specified in an emergency regulation instruction issued by a safety and stability control system master station, the new energy collection station control substation sends an additional control request to a generator tripping load shedding control substation, and the generator tripping load shedding control substation implements additional control. According to the method, control of the virtual synchronous generators is introduced into the safety and stability control system, when the safety and stability control system detects a fault, an offline control strategy is corrected by considering regulable regulation capacity and sensitivity difference of the virtual synchronous generators, and cost of conventional safety and stability control is reduced.

Description

technical field [0001] The invention belongs to the technical field of electric power system and automation thereof, and in particular relates to a safety and stability coordination control method of a power grid considering the access of a virtual synchronous generator. Background technique [0002] In July 2015, the "Guiding Opinions on Promoting the Development of Smart Grid" promulgated by the National Development and Reform Commission and the Energy Bureau clearly stated that "the grid-connected equipment with plug-and-play and friendly grid-connected features will be promoted to meet the needs of new energy and distributed power sources. Broad Access Requirements". As the link between distributed resources and the distribution network (microgrid), the function of the grid-connected inverter has been deeply explored and its beneficial role has been affirmed, but it is still impossible to ignore the conventional control strategy itself to ensure the safety and stability ...

AI Technical Summary

Problems solved by technology

[0003] At present, the virtual synchronous generator technology and devices have been implemented in the demonstration branch of the actual power grid, but they still stay in the fast adjustment of their own power output in response to the local electric eye and frequency response, neither specific interaction with the overall stability of the power grid nor Realize coordination with traditional machine-cutting and load-shedding control measures; moreover, when the actual system is running, the virtual synchronous generator also responds to frequent small disturbance events in the power grid, and when a serious fault occurs in the power grid, it needs to respond quickly to frequency or voltage Virtual synchronous generators often have no ability to regulate when offset

The current offline simulation analysis is still difficult to truly simulate this situation. The offline control strategy in the actual control and protection system ignores the regulation and control of the virtual synchronous generator, and the emergency control measures are heavy, which is prone to over-control risks.

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