Coordinated control method and system for event-driven load shedding and corrective line switching

Abstract

The invention discloses an event-driven load shedding and corrective line switching coordination control method and system. The method includes the following steps: 1. acquiring actual power grid data, establishing a simulation model of the power grid which is under research; setting corresponding parameters; 2. selecting preconceived incidents, if a control measurement is not adopted, executing a transient simulation to obtain monitoring data, computing a corresponding safety margin index and comparing the corresponding safety margin index with a preset safety margin critical value, determining whether a system is at transient safety and has no branch overloaded; 3. Establishing an optimized model from the selected preconceived incident and the set parameters, conducting iterative solution, computing a load shedding control vector and a line switching control vector, the in combination with the position of each load shedding node and a switching line in the power grid, formulating a control plan for the current preconceived incident; and 4. when the power grid has an accident, executing a corresponding control plan with a starting plan which is to immediately start the control plan when an accident is detected; returning to step 1 every a certain period of time.

Description

technical field [0001] The invention belongs to the field of power system safety and stability control, and in particular relates to an event-driven load shedding and corrective line switching coordination control method and system. Background technique [0002] Driven by the national policy of energy conservation and emission reduction, the power generation of renewable clean energy such as wind power and photovoltaics has developed rapidly, and the penetration rate in the power grid has continued to increase. A large number of these low-inertia power sources are connected to the power system, which will reduce the equivalent inertia time constant of the system and aggravate the degree of frequency drop when the power shortage is disturbed. Due to the reverse distribution of my country's load consumption centers and energy resource centers, long-distance and large-capacity transmission of electric energy has become a necessary measure. With the construction of a number of ...

AI Technical Summary

Problems solved by technology

However, at present, corrective line switching is mainly controlled separately, lacking coordination with other control measures (such as load shedding, DC emergency modulation, etc.)

For severe faults, it is possible that the overload cannot be eliminated only by corrective line switching, and only the impact of corrective line switching on overload is considered, without considering whether it will deteriorate the system transient frequency and voltage safety, which may cause control Negative effect of

[0006] To sum up, the transformation of power grid structure and the introduction of new regulations have put forward new requirements and challenges for power system security and stability control, and the existing system security and stability control technologies have certain limitations.

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