The establishment method of the ward equivalent model of the extended voltage source branch of the external network and its application in state estimation
An equivalent model and establishment method technology, applied in the direction of AC network circuits, circuit devices, electrical components, etc., can solve the problems of amplifying the ground admittance value of the boundary node, the influence of the equivalent impedance, and the low accuracy, and achieve strong The practical value of the project, the avoidance of large errors, and the effect of reducing the scale
Active Publication Date: 2020-07-03
CHONGQING UNIV +1
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Problems solved by technology
The method of directly connecting the equivalent machine based on the external network does not consider the impact of the external network topology on the internal network, and the accuracy is not high
Based on the conventional Ward equivalent method, the equivalent impedance between the external network and the ground branch in the model will affect the boundary nodes, and may amplify the equivalent ground admittance value on the boundary nodes, so that when the boundary node voltage changes, it will bring large power error
[0004] Although the state estimation method based on the extended Ward equivalent model avoids the disadvantages of the conventional Ward equivalent model and has high estimation accuracy, the required external network information includes both equivalent impedance parameters and state parameters, which is easy to be caused by the abnormal state of the external network. Real-time equivalent results in large errors
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[0056] The present invention will be further described below in conjunction with embodiments, but it should not be understood that the scope of the above subject matter of the present invention is limited to the following embodiments. Without departing from the above technical idea of the present invention, various substitutions and changes based on common technical knowledge and conventional means in the field should be included in the protection scope of the present invention.
[0057] Take the IEEE 39-node system as an example, with nodes 3 and 17 as boundary points, nodes 1, 2, 25-30, and 37-39 as external network nodes, and the remaining nodes are internal network nodes. At the same time, branch 9-39 is disconnected, and Set the load of node 17 to 10-j20MVA to form a two-port interconnected power grid simulation system. The simulation parameters are standard unit values, and the reference power is 100MVA. In order to illustrate the superiority of this method in detail, tw...
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The invention discloses an establishing method that considers the extended voltage-source branch Ward-equivalence model and the application thereof in state estimation. When the established model is applied to intranet state estimation, the network information part that is of no interest or cannot be obtained in real time from an original power system can be replaced, which shrinks the scale for state estimation greatly. When the state estimation method disclosed by the invention calculates, the equivalent impedance parameter can be obtained directly from an extended topological structure or the extended Ward-equivalence without the providing of any state parameters of an intranet. This means all needs for state estimation calculation is the intranet measured information, which avoids the big errors that might arise from the non-real time equivalence of the intranet state.
Description
Technical field [0001] The invention belongs to the field of power system dispatching automation, and in particular relates to a method for establishing a Ward equivalent model considering external network expansion voltage source branch and its application in state estimation. . Background technique [0002] With the rapid development of the power industry, the power grid has become increasingly large. If the dispatch center estimates the real-time operation status of the entire network only through measurement information, it will often consume a lot of computing time, and even cannot meet the requirements of real-time online calculation. In addition, due to the measurement configuration The problem is that some parts of the system lack measurement information, which makes the system unobservable. These practical problems can all be dealt with by the equivalent method. [0003] At present, the static equivalent models of the external network used in state estimation include: ha...
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IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor颜伟李世明王茜向德军张超徐展强余志文王彬林玥廷
OwnerCHONGQING UNIV