State estimation method and system for regional power system based on synchronized phasor measurement

Abstract

The invention discloses a method and a system for estimating states of regional electric power systems on the basis of synchronous phasor measurement. The method includes dividing the specified regional electric power systems into different subsystems and specified regional systems and acquiring internal measurement data of internal nodes in the various subsystems, boundary measurement data of boundary nodes and connection line measurement data of connection lines on the boundary nodes; computing state estimation of the internal nodes in the various subsystems and preliminarily estimated values of the boundary nodes by the aid of quick decoupling estimation processes according to the internal measurement data and the boundary measurement data and transmitting the state estimation and the preliminarily estimated values to the specified regional systems; computing coordination state estimation of the boundary nodes by the aid of linear coordination estimation processes according to the preliminarily estimated values and the connecting wire measurement data and utilizing the state estimation of the internal nodes and the coordination state estimation of the boundary nodes as estimation of the states of the regional electric power systems. The method and the system have the advantage that the electric power system state estimation computation speed can be greatly increased.

Description

technical field [0001] The invention relates to the field of electrical technology, in particular to a method and system for estimating the state of a regional power system based on synchronized phasor measurement. Background technique [0002] Since its appearance in 1970, power system state estimation has become an indispensable basic function in the energy management system (EMS) of every power grid. The state estimation module can calculate and estimate the voltage amplitude and phase angle of each node (substation) bus of the power grid from the redundant power grid measurement. These voltage amplitude and phase angle data are widely used in the functions of stability calculation, power flow analysis and safety assessment in power grid operation, and play a vital role in the safe and stable operation of the power grid. [0003] With the rapid development of my country's economy and the sharp increase in power demand, my country's power grid structure has also been rapi...

AI Technical Summary

Problems solved by technology

The rapid expansion of the power grid has brought many difficulties to the state estimation of the regional power grid power system. The most direct impact is that the huge grid structure and the large number of substations have doubled the measurement data of the power grid, resulting in an increasing speed of state estimation. The slower it is, the more difficult it is to meet the needs of the daily operation of the power grid

In the future, with the further advancement of smart grid and UHV AC / DC grid, the further introduction of intelligent measurement (such as synchronized phasor measurement, etc.) will exacerbate the problem of low calculation speed of current state estimation

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