A method and device for state estimation of a secondary system of an intelligent substation

Abstract

The invention discloses a method and a device for estimating the state of the secondary systems of an intelligent substation. The state of the sampling value of a secondary monitoring system is estimated according to the physical association between secondary equipment and the association relationship between logic nodes, wherein the association relationship between the logic nodes of the secondary systems is obtained according to an SCD file of a substation, and the message transmission relationship between the secondary systems is obtained according to the sampling value data transmission channel and object. Then, a linear state estimation formula is obtained according to an overall error minimum objective function, and state estimation is carried out on the error between the actual sampling receiving value and the theoretical sampling receiving value, so as to restore the real sampling data of the secondary systems. A lot of manual participation and practical experience are often required in order to make comprehensive use of the data information of the secondary systems of an intelligent substation, which causes the waste of time and energy and low efficiency and limits the power grid accident handling capacity and recovery speed. The technical problem is solved by using the method and the device of the invention.

Description

technical field [0001] The invention relates to the field of electric power, in particular to a method and device for estimating the state of a secondary system of an intelligent substation. Background technique [0002] The secondary system of real smart substation is an important guarantee to ensure the safe and stable operation of the power grid. At present, the state of the secondary system of the substation lacks effective monitoring methods. Due to equipment defects, secondary circuit failures, clock out-of-synchronization, fixed value and logic errors, secondary system abnormalities occur from time to time, which brings great harm to the safety and stability of the power grid. On the other hand, the accident analysis of the primary system of the power grid often requires the coordinated work of multiple secondary professional systems. [0003] In the existing technology, the secondary system of the smart substation is designed according to specific functions, the dat...

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Problems solved by technology

[0004] The present invention provides a method and device for state estimation of a secondary system of an intelligent substation, which is used to solve the problem in the prior art that the secondary system of an intelligent substation is designed according to a specific function, with independent data collection and single function. The data information often requires a lot of manual participation and practical experience, resulting in time-consuming, labor-intensive, low-efficiency technical problems that limit the power grid accident handling capacity and recovery speed

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