Method for joint state estimation of transmission network and distribution network
A state estimation and transmission network technology, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve problems such as difficult coordination of power flow, difficult realization of distribution network, asymmetric three-phase parameters, etc., to achieve practicality, reduce The effect of small current errors
Inactive Publication Date: 2010-01-27
SHANGHAI SUNRISE POWER TECH
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Problems solved by technology
Due to the small number of measurement and acquisition points in the distribution network, the unbalanced three-phase acquisition, and the asymmetry of the three-phase parameters, the state estimation method applied in the transmission network is difficult to implement in the distribution network.
Therefore, in solving the state equation of the power system, the state estimation method is generally used for the transmission network, and the load distribution calculation method is used for the distribution network. The tide is difficult to coordinate, and the error is large
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[0025] The embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings, but the present embodiments are not intended to limit the present invention, and any similar structures and similar changes of the present invention should be included in the protection scope of the present invention.
[0026] Such as figure 1 As shown, a method for joint state estimation of a transmission and distribution network provided by an embodiment of the present invention is characterized in that the specific steps are as follows:
[0027] 1) Search the outgoing line switch in the distribution network, and put the equivalent load of each feeder line in the distribution network to each outgoing line switch;
[0028] 2) Taking each outlet switch of the distribution network as the equivalent load of the transmission network, the state estimation of the transmission network is performed at least three times to obtain the initial estimate...
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A method for joint state estimation of a transmission network and a distribution network relates to the technical field of steady-state analysis of power networks, and aims at solving the technical problem of reducing tidal current errors at junctions of the transmission network and the distribution network. The method comprises the following specific steps: first, searching the distribution network, and equally distributing load of each feed line on each outgoing line switch; carrying out at least three times of state estimation on the transmission network according to each outgoing line switch of the distribution network; calculating symmetrical three-phase outgoing line load and unsymmetrical three-phase outgoing line load of each outgoing line switch of the distribution network; and calculating equivalent constraint values of all switches on a bus of the transmission network, and taking the calculated results as amount of unbalance of bus injection loads for the next transmission network state estimation to participate in the next transmission network state estimation until the difference is converged to preset constraint values. The method can help reduce tidal current errorsat junctions of the transmission network and the distribution network.
Description
technical field [0001] The invention relates to the technology of power grid steady-state analysis, in particular to the technology of a method for joint state estimation of transmission and distribution networks. Background technique [0002] State Estimation calculation (State Estimation, SE) is an important part of the Energy Management System (Energy Management System, EMS). The credible grid status (i.e. the voltage amplitude and phase angle of all buses) forms a reliable real-time database, which serves as a data source for other advanced application analysis. [0003] In regional power grids, transmission and distribution networks generally exist at the same time, especially in small local power grids, the two are integrated and inseparable. The high-voltage transmission network generally operates in a ring network, with many collection points and strong observability; while the distribution network network has the characteristics of ring network design and open-loop...
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Inventor 李昌陈毅黄遵学
Owner SHANGHAI SUNRISE POWER TECH