Real-time monitoring and early warning method for load abnormality and operation risk of power grid

Abstract

The invention discloses a real-time monitoring and early warning method for load abnormality and an operation risk of a power grid. The method comprises: obtaining data and establishing an expert knowledge base; obtaining a real-time telemetering and remote signalling value; determining an operating state of a power grid, determining data fluctuation and a refreshing state, and carrying out alarming; identifying an operation topological structure of the power grid; identifying a grid weak link and a security risk level, and carrying out alarming, and determining a control margin of an operation section of the power grid and carrying out alarming. According to the invention, steady-state monitoring is carried out on telemetering data of a plant station; a real-time weak point of the power grid is monitored and estimated dynamically; auxiliary recording and warning prompting are carried out on abnormal situations like non-refreshing data, grid load fluctuation, low-frequency oscillation, and insufficient grid operation security risk control and stability margin control; the important basis is provided for real-time monitoring of the dispatching operators on duty and the work intensity of the operator on duty is reduced; the grid operation risk can be controlled effectively; and scientific decision making for accident processing is realized.

Description

technical field [0001] The invention belongs to the field of electric power system automation, and in particular relates to a real-time monitoring and early warning method for power grid load abnormality and operation risk. Background technique [0002] With the rapid development of my country's regional power grid interconnection and the steady advancement of UHV power grid construction, the technical level and complexity of power grid operation are getting higher and higher, and the difficulty of power grid operation control is becoming more and more difficult; [0003] 1) Traditional manual monitoring of important operating data is no longer suitable for the requirements of modern large-scale interconnected power grids. The dispatching duty personnel responsible for the daily monitoring and control of the frequency and voltage of the provincial power grid need to monitor the real-time curve of the total power generation (supply) of the provincial power grid, the real-time...

AI Technical Summary

Problems solved by technology

With the increasing scale of the power grid and the increasing amount of monitoring data per capita, traditional human eyes are no longer capable of monitoring such complicated real-time operation data;

[0004] 2) The grid topology is becoming more and more complex

With the increasing scale of the power grid, the increasingly flexible operation mode, and the increasingly complex and stringent stability control regulations, it is difficult to ensure fast and accurate judgments on the stability control requirements of the power grid operation only by the memory of dispatchers on duty;

[0006] 4) Power grid abnormalities such as forced power oscillation and low-frequency oscillation typical of load fluctuations have become increasingly prominent

The Wide Area Measurement System (WAMS) based on the synchrophasor measurement unit (Phasor Measurement Unit, PMU) can directly measure the node voltage phasor and branch current phasor, with high data accuracy and short transmission delay, etc. However, as far as the current technical level is concerned, the economic problems brought about by the deployment of PMUs in the entire network and the technical problems brought about by the storage and processing, management and utilization of massive measurement data, and the calculation and communication of the massive measurement data have determined that the two major bottlenecks will be in a rather long period of time. Within a short period of time, WAMS still needs to combine with the data acquisition and monitoring system (Supervisory Control And Acquisition, SCADA) based on the Energy Manager System (Energy Manager System, EMS) to prepare for real-time analysis of the dynamic process of the power grid

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