Power system state estimator applicable to wide area measurement system

Abstract

The invention relates to a power system state estimator applicable to a wide area measurement system in the technical field of operation and control of power systems. The power system state estimator comprises a data fusion module, a system identification module, a transient stability control module and a security evaluation module, wherein the data fusion module only stores 'key' data which reflect electric network characteristics and meet measurement accuracy; the system identification module modifies system parameters and data, and an output of the system identification module is connected with the transient stability control module; the transient stability control module sends processed data into the security evaluation module and performs security evaluation on the system; and the security evaluation module finally outputs important information. The power system state estimator can realize the fusion, real-time state estimation and analytical evaluation for mass data, ensure the safe and stable operation of the system, and can also improve the accuracy of state estimation by identifying electric network parameters and processing bad data at the same time; and the power system state estimator can provide good application interfaces and alarm prompts, and effectively play roles in electric network dynamic early warning and accident treatment of the system.

Description

technical field [0001] The invention relates to a state estimator in the technical field of power system operation and control, in particular to a power system state estimator suitable for wide-area measurement systems. Background technique [0002] The main purpose of developing Energy Management System (EMS) is to improve the safety and economy of large-scale power generation and high-voltage transmission system operation in power systems. State estimation is the core function of EMS. It is a real-time computer program and algorithm that converts available redundant information (direct measurement values ​​and other information) into current state estimates of the power system. Accurate state estimation results are an essential basis for subsequent work (such as safety analysis, dispatcher power flow and optimal power flow, etc.). [0003] In recent years, the Global Positioning System (Global Position System, GPS) has been fully established and put into operation. Due to...

AI Technical Summary

Problems solved by technology

Wide-area synchronous measurement system (WAMS) has been widely used to solve the dynamic monitoring and control problems of power systems due to the rapidity and synchronization of its measurement data. However, the construction of WAMS will be a gradual process and will not There is a situation where the entire PMU network can be observed; and WAMS, as a measurement system, inevitably has measurement errors and even bad data to a certain extent

If it is directly applied without estimating and processing the WAMS dynamic data, it may lead to wrong judgment and control results, which will bring serious losses to the power system

[0005] After searching the existing technical documents, it is found that the Chinese invention patent (Patent No. 02157858) has announced a state estimation system for power transmission network. The state estimation of the entire power system including power generation, transmission and distribution in the domain measurement system; the US invention patent (patent No. 7499816) proposes a real-time state estimation system based on the synchrophasor measurement system. This method is only applicable to It is limited to the real-time processing of synchronous and asynchronous data in the power system, and the data processing process is complex, and there is no reasonable and effective analysis of the state estimation data

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