Trans-regional AC and DC networking safety and stability coordination control measure real-time quantification method

Abstract

The invention provides a trans-regional AC and DC networking safety and stability coordination control measure real-time quantification method. According to the trans-regional AC and DC networking safety and stability coordination control measure real-time quantification method, characteristic quantity of a power grid is extracted based on power grid operating data, and the power limit of an interconnection tie of the regional power grid during static and stable operating is calculated, wherein the characteristic quantity includes the regional power grid overall inertia constant ratio, the leading oscillation mode between large-region power grids and the trans-regional direct-current power controllable quantity; the overshoot of the power fluctuation peak value of the interconnection tie is calculated according to disturbance information which happens to the regional power grid; a machine switching or load switching quantification control measure needing to be taken is calculated based on the interconnection tie power peak value fluctuating theory and the unbalanced power redistribution theory. According to the trans-regional AC and DC networking safety and stability coordination control measure real-time quantification method, direct-current power is used for emergency control, machine switching / load switching amount can be replaced or reduced, the safety and operating efficiency of the power grid are effectively improved, and the method is suitable for off-line simulating calculation of an electric power system as well as on-line development and operation of AC and DC coordination control measures.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to a method for real-time quantification of safety and stability coordination control measures of cross-regional AC and DC networking. Background technique [0002] The geographical distribution of my country's energy resources and electricity demand against the trend determines that the development of my country's power grid must take the road of long-distance, large-scale power transmission and optimizing the allocation of power resources nationwide. The large-scale, long-distance power transmission pattern solves the problem of large-scale clean energy and new energy consumption, the problem of water and fire mutual aid, and realizes the optimal allocation of resources across the country. At the same time, it also brings a series of challenges to the safe and stable operation of the power grid, especially During the transition period of UHV power grid development, such as...

AI Technical Summary

Problems solved by technology

At present, the traditional safety and stability control mainly deals with the stability of the system after a disturbance / fault by cutting machines and loads, system splitting, and low-voltage and low-frequency load shedding. Strategy matching based on expected accident sets, local control based on local signals, and hard measures based on machine shedding and load shedding cannot meet the needs of future safety and stability control of large power grids

For example, online strategy matching based on offline simulation calculations for specific anticipated accidents has the risk of strategy failure or failure to match for complex power grid structures and changing operation modes; by means of machine cutting, load shedding, and system de-coupling, etc., It will lead to large-scale power outages, unable to effectively reduce the scope of the accident, conflict with the increasingly stringent power supply reliability indicators of users, and affect the operation efficiency of the power grid; it cannot cope with the impact of uncertain disturbance / fault patterns on the power grid, and cannot improve the safety and stability of the power grid Operating margin and transmission capacity

[0003] Therefore, the traditional safety and stability control technology needs to be improved in terms of improving the safety and stability level of the power grid, power transmission capacity and operating efficiency, and cannot adapt to the complex grid structure and variable operation mode of the UHV AC and DC large power grid in the future. For certain disturbance / accident forms, it is necessary to find a new power grid safety and stability control technology that can deal with various problems of complex and large power grids, replace or reduce "hard controls" such as load shedding, and based on this, the present invention is proposed

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