A method and device for power grid state estimation

Abstract

The invention provides a power grid state estimation method and device. The method comprises the following steps of dividing a power grid into a plurality of subsystems, and determining connection nodes and internal nodes; acquiring first remote terminal unit (RTU) measurement data and power management unit (PMU) measurement data of each internal node and each connection node to obtain first acquisition data, inputting the first acquisition data into a preset first measurement model, and obtaining first estimation voltage vectors of each internal node and each connection node by a least square method; acquiring second PMU measurement data and the first estimation voltage vector of each connection node to obtain second acquisition data, inputting the second acquisition data into a preset second measurement model, and obtaining a second estimation voltage vector of each connection node through linear estimation; and carrying out power grid state estimation according to the first estimation voltage vector of each internal node and the second estimation voltage vector of each connection node to obtain a power grid state estimation result. By the method, the power grid estimation calculation speed is increased, the requirement of real-time control on a power grid is met more, and the power grid state estimation result is more accurate.

Description

technical field [0001] The invention relates to the field of state estimation calculations, in particular to a method and device for power grid state estimation. Background technique [0002] State estimation emerged in the 1970s and has since become a core function of energy management systems (EMS) in grid regulation centers. Especially in today's widespread application of automation equipment in the power system, the calculation results of state estimation play a vital role in the operation and dispatch of the power grid. However, in the last ten years, the scale of urban grids has expanded rapidly. Take Hangzhou urban power grid as an example. The capacity of Hangzhou power grid ranks first among provincial capital cities in the country, and has more than doubled in the past few years. At the same time, with the rapid development of intelligence in the future, the number of measurements in substations is also increasing rapidly, and the corresponding signal transmissio...

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Problems solved by technology

[0003] In view of this, an embodiment of the present invention provides a grid state estimation method and device to solve the problem that the speed of state estimation calculation in the prior art cannot meet the requirements for real-time control of the grid in the smart grid

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