Simulation evaluation method and device for configuration of power grid high-cycle cut-off machine

Abstract

The invention discloses a simulation evaluation method and device for the configuration of a power grid high-cycle cut-off machine, which relates to the technical field of the safety and stability ofan electric power system and aims to solve a problem of inspection and evaluation for a configuration scheme of the high-cycle cut-off machine. The simulation evaluation method for the configuration of the power grid high-cycle cut-off machine comprises the steps of building a simulation model of an asynchronous operation power grid; setting a typical operation mode of the simulation model, and building a preconceived fault set; compiling a configuration scheme of the high-cycle cut-off machine; and operating a fault in the preconceived fault set in the typical operation mode according to thesimulation model, and calculating power grid frequency characteristics, the capacity of the high-cycle cut-off machine and wind power off-grid conditions of the simulation model in the breakdown condition. Influences imposed on the power grid frequency characteristics by the wind power off-grid are analyzed according to a calculation result of the simulation model, and the configuration scheme ofthe high-cycle cut-off machine is evaluated. Evaluation can be performed on the configuration of the high-cycle cut-off machine conveniently and simply according to the simulation evaluation method and device provided by the invention for the configuration of the power grid high-cycle cut-off machine.

Description

technical field [0001] The invention relates to the technical field of power system security and stability, in particular to a method and device for emulating and evaluating the configuration of power grid high-frequency cut-off machines. Background technique [0002] With my country's high emphasis on renewable energy and the continuous development of DC transmission technology, on the one hand, wind power is developing extremely rapidly, and the installed capacity is increasing year by year; on the other hand, DC transmission power is increasing. At present, Yunnan Power Grid and South The grid main network has implemented asynchronous networking. Although the asynchronous networked grid avoids the disadvantages of the limited power transmission section limit of the AC-DC parallel operation grid and the DC blockade that leads to the system's transient power angle stability problems, but the generators of the non-faulty grid cannot directly participate in the primary frequen...

AI Technical Summary

Problems solved by technology

Although the asynchronously networked power grid avoids the disadvantages of the limited power transmission section limit of the AC-DC parallel operation grid and the DC blockade that leads to the system's transient power angle stability problems, there are units in the non-faulty grid that cannot directly participate in the primary frequency regulation of the faulty grid, which is not conducive to Suppress frequency fluctuations, and the problem of frequency stability is prominent

However, wind power is random and volatile, and large-scale access to the power grid poses serious challenges to the frequency stability of the asynchronous power grid.

[0003] The high-frequency cutting machine belongs to the category of the third line of defense. Configuring a high-frequency cutting machine device for the sending-end power grid is an important technical measure to solve the problem of frequency control when the outgoing transmission channel of the sending-end power grid is disconnected. When blocking, the frequency of the system will increase due to the instantaneous power surplus after the fault, and there may be a large-scale off-grid phenomenon of wind power. If the configuration of the high-frequency cut-off machine is improper, there will be a problem of unit over-cutting, and the system will reduce the frequency due to power shortage, resulting in low frequency. Load shedding device action

[0004] Since the actual power grid has extremely high requirements on the safety and stability of the operation, if the configuration scheme of the high-speed cut-off machine is tested and evaluated when the actual power grid fails, the configuration scheme that does not adapt to the change of the power grid will easily affect the security and stability of the power grid

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