Distributed power system state estimation method

A technology of distributed power and system status, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as inability to distinguish DG types, inability to obtain DG operating status, and failure to consider DG types, models and their own state variables, etc.

Inactive Publication Date: 2012-08-01
HOHAI UNIV
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Problems solved by technology

The existing distributed power system state estimation method treats the DG as a load, without considering the type, model and state variables of the DG, that is, only regards the DG as a general load node, and only estimates the voltage amplitude U of the node. And the phase angle θ, but can not get the running state of the DG itself, and can not distinguish the type of DG and other characteristics

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Embodiment Construction

[0036] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0037]The real-time operation and control of the power system needs to understand the real operating conditions of the system. Due to reasons such as measurement and transmission, the raw data obtained inevitably have errors. State estimation can improve the accuracy of the data to a certain extent. Since F.C.Schweppe of the Massachusetts Institute of Technology and others proposed the most basic algorithm for state estimation of power systems in 1969, the basic weighted least squares (Weighted Least Squares WLS) state estimation algorithm, the weighted least squares method has become a power It is the most widely used algorithm in system state estimation. Its basic idea is to use the minimum sum of squares of the difference between the quantity measurement and the measurement estimated value as the target criterion for the estimation method. The prese...

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Abstract

The invention discloses a distributed power system state estimation method. A distributed power system state estimation model is established in consideration of distributed generation (DG) characteristics so that the real-time accurate operational state of each node in the power grid can be obtained, and the real-time accurate operational state of the DG can also be obtained; secondly, a preserving non-linear method is introduced to the state estimation, and the truncation error is avoided so that the state estimation is provided with a higher computational accuracy and the iteration efficiency of an algorithm is improved; and finally, the Jacobian matrix and the Hessian matrix of a function is calculated and measured in the preserving non-linear method of the state estimation, the work load of manually calculating a large quantity of differential functions and compiling differential codes is large, and the work is too cumbersome and easy to produce errors so that the distributed power system state estimation method utilizes the automatic differentiation technique to replace the traditional manual compiling differential codes to calculate the Jacobian matrix and the Hessian matrix, the workload of the manual compiling codes is reduced, and the development efficiency of procedures is improved.

Description

technical field [0001] The invention relates to a distributed power system state estimation method, which belongs to the technical field of power system operation and control. Background technique [0002] With the continuous development of smart grid technology and the access of a large number of distributed generation (DG for short), new requirements are put forward for the energy management system (Energy Manage System, EMS). The energy management system is a computer-based modern power dispatching automation system. The most fundamental change it brings is from the traditional empirical dispatching to the analytical dispatching, thereby improving the safety and economy of the power system operation. With the continuous expansion of the grid scale and the access of a large number of distributed power sources and new energy to the grid, the structure and operation mode of the power system are becoming increasingly complex, and the automation level of the power system dispa...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00G06F17/16
Inventor 杨雄卫志农孙国强孙永辉韦延方袁阳陆子刚张伟陈凡颜全椿吴兴扬
Owner HOHAI UNIV
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