Transformer substation three phase linear generalized state estimation method

Abstract

The invention discloses a transformer substation three phase linear generalized state estimation method. According to the transformer substation three phase linear generalized state estimation method is used, state estimation is performed in a split-phase and zero-impedance network, and therefore a calculation scale is small, and calculation difficulty is low; three phase multisource real time data from a measuring and control device, a phasor measurement unit and a protection device is used, and therefore data redundancy and calculation reliability of the state estimation are improved; established measurement equations are all linear, calculation does not need iteration, and therefore estimation calculation is simple and rapid; an on and off state pseudo measurement equation is established and used in combination with the measurement equations in the state estimation, bad data identification is performed by using a maximum residual error method, and therefore synchronous identification of analog quantity bad data and topology error is achieved. By using the transformer substation three phase linear generalized state estimation method, the bad data and the topology error are solved in a transformer substation, accurate basic data is provided to a regulation and control center, calculated amount of the state estimation of the regulation and control center is significantly reduced, and reliability is improved.

Description

technical field [0001] The invention relates to a three-phase linear generalized state estimation method of a substation, which belongs to the field of substation automation. Background technique [0002] Power system state estimation uses the measurement data collected by substations to estimate or predict the operating state of the power system. State estimation is the basis of the information processing stage in the energy management system, which directly affects the decision-making of the control center and is related to the safe and stable operation of the power grid. Traditional state estimation ignores the interaction among the three data of analog quantity, switch quantity and network parameters. Before state estimation, it is assumed that the switch state and network parameters are correct. When these assumptions are not established, it will lead to serious errors. [0003] The generalized state estimation method models suspicious substations in detail, and uses n...

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Problems solved by technology

As the preprocessing stage before the state estimation of the control center, the generalized state estimation of the substation needs to be fast and reliable in order to provide more accurate basic data for the control center, and the existing generalized state estimation methods do not have this feature.

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