Three-phase state estimation method for active distribution network considering multi-type distributed generation
A distributed power supply and active distribution network technology, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve the problems of not establishing a DG physical model and not being accurate enough, and achieve a good engineering application background and ensure observability , the effect of high computational efficiency and convergence performance
Inactive Publication Date: 2017-08-25
HOHAI UNIV
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The existing modeling methods for DG can be mainly divided into two categories: 1) The DG is regarded as a general PQ injection node, and no detailed physical model of DG is established
2) For a DG that is not configured with real-time measurement, the three-phase total output of the DG is predicted based on historical data and real-time weather, and assuming that the three-phase injected power of the DG is equal, the pseudo-measured value of the injected power of each phase of the DG is obtained. Although this method Simplifies the estimation of the three-phase DG, but because the three-phase injected power of the DG must be asymmetrical in practice, this method is not accurate enough
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[0056] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention Modifications in equivalent forms all fall within the scope defined by the appended claims of this application.
[0057] Such as figure 1 Shown, the present invention comprises the following steps:
[0058] 1. Distribution network WLS estimation
[0059] WLS estimation essentially solves the following optimization problem:
[0060]
[0061] In the formula: for quantity measurement; is a state variable; is the measurement weight matrix; h(·) describes the nonlinear relationship between z and ; the necessary condition for the system to be observable is: m>n.
[0062] In t...
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The present invention proposes a method for estimating the three-phase state of an active distribution network that takes multi-type distributed power sources into account, and ensures the observability of each sub-area of the active distribution network by adding pseudo-measurements to the state quantities of DG and boundary areas; The three-phase model of DG grid connection is established, and the real-time operation status of DG and AC nodes is accurately estimated; WLS estimator is selected, which has high calculation efficiency and convergence performance. Therefore, the present invention provides a guarantee for the steady-state analysis of the intelligent power distribution system and the application of advanced software, and has a good engineering application background.
Description
technical field [0001] The invention relates to a three-phase state estimation method of an active distribution network considering multi-type distributed power sources, and belongs to the field of distribution network analysis and control. Background technique [0002] With the massive access of distributed generators (DG), the traditional passive distribution network is gradually transforming into an active distribution system (ADS) with multiple types of DG. At the same time, in order to ensure the application of advanced software in intelligent distribution system, active distribution network state estimation is an indispensable part. In addition, due to the asymmetry of load and line parameters, the distribution network is generally three-phase asymmetric, so it is more practical to study the three-phase state estimation of the active distribution network. [0003] The research on state estimation of traditional distribution network mainly includes three aspects: 1) Th...
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IPC IPC(8): H02J3/00
Inventor 陈胜卫志农孙国强孙永辉臧海祥朱瑛
Owner HOHAI UNIV