Flexible direct-current emergency control method and system at high regional grid power transmission receiving ratio

Abstract

The invention provides a flexible direct-current emergency control method and system at a high regional grid power transmission receiving ratio. The method comprises: on the basis of all plans corresponding to a fault in an advance primary plan set, simulation and analysis are carried out respectively to obtain a simulation result corresponding to each plan; according to the simulation results, anoptimal plan corresponding to the fault is obtained by using an analytic hierarchy process; and a control method is formulated based on the fault and the optimal plan corresponding to the fault. According to the invention, on the basis of the characteristic of quick and flexible control mode selection of the flexible direct-current active and reactive transmission and decoupling, the operation risk of the local area grid at a high power transmission receiving ratio is reduced, the capability of resisting the voltage instability risk by the grid is strengthened, and the safe stable high-efficiency economic operation level of the grid is enhanced.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to a flexible direct current emergency control method and system under a high power receiving ratio of a regional power grid. Background technique [0002] The main characteristics of flexible DC transmission are independent control of active power and reactive power, no commutation failure, and easy construction of DC grids, so it has been vigorously developed, especially in the application of grid interconnection projects, flexible DC transmission has incomparable advantages compared with traditional DC transmission The advantages. Flexible DC can realize decoupling control of active power and reactive power on the AC side and flexible and fast switching of control methods. Under normal operating conditions, the active power control of the flexible DC at both ends can be controlled by constant DC voltage at the sending end, constant active power control at the receiving e...

AI Technical Summary

Problems solved by technology

However, existing research has focused on the station-level or valve-level control of flexible DC itself. Most of the research results in system-level control are limited to the analysis of the performance requirements and control requirements of flexible DC in specific scenarios. How to effectively use the flexible control of flexible DC The research on the specific power grid fault forms of functional fortification is still insufficient

The power grid covers a wide range and the application scenarios are complex. How to rationally use the fast and flexible control capabilities of flexible DC in the event of a serious grid failure, and choose flexible DC emergency control measures suitable for the operation of the regional power grid, currently lacks reasonable and suitable for practical engineering applications. methods and means

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