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Power system fusion state estimation method based on switching system models

A technology for power systems and switching systems, applied in system integration technology, information technology support systems, electrical components, etc., can solve the problems of unobservable systems and high sampling frequency of phasor measurement units, and achieve the advantages of estimation error and convergence speed. Adaptive, wide-ranging effects

Active Publication Date: 2019-07-19
NANJING UNIV OF POSTS & TELECOMM +1
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Problems solved by technology

However, limited by the cost, such equipment is often not configured in large quantities, and the state estimator based only on the phasor measurement unit is usually unsatisfactory for the system
On the other hand, the sampling frequency of the phasor measurement unit is high. How to integrate the measurement of the phasor measurement unit with high sampling frequency and the traditional measurement with low sampling frequency is also a big difficulty

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  • Power system fusion state estimation method based on switching system models
  • Power system fusion state estimation method based on switching system models
  • Power system fusion state estimation method based on switching system models

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Embodiment Construction

[0039] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

[0040] Such as figure 1 As shown, the present invention provides a method for estimating the fusion state of a power system based on a switching system model, comprising the following steps:

[0041] S1: The dynamic generalized mathematical model considering the state estimation of the power system is as follows

[0042] x k+1 =f(x k ,u k ,w k ,k) (1)

[0043] Among them, x represents the state vector, u is the control input, w represents the uncertainty of modeling, and k is the time label. The actual physical f( ) is a complex nonlinear model, but through a series of assumptions such as a small time window, using a linear function to represent the state transition, and ignoring the control variables, the subsystem dynamics that adapt to the slow change of the system state can be obtained Model I:

[0044] x k+1 =x k +w k (2)

[0...

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Abstract

The invention discloses a power system fusion state estimation method based on switching system models. The method comprises the steps that two subsystem dynamic models of a switching system are established; switching rules are established according to information values of synchronous phasor measurement units; on different time scales, Kalman filtering is performed respectively based on all measurement subsets; and according to an optimal fusion estimation theory, estimation results based on the different measurement subsets are fused, and the next sampling cycle is entered. According to themethod, through establishment of the switching system models, the adaptability of a state estimation algorithm is improved; and compared with a single-model estimator mode and a static estimator mode,the fusion state estimation mode is adopted, so that the method has more advantages in estimation of errors, convergence speed and calculation time.

Description

technical field [0001] The invention relates to the field of power system control, in particular to a power system fusion state estimation method based on a switching system model. Background technique [0002] State estimation has always been one of the basic components of modern power system monitoring and planning. It monitors the state of the entire network and supports the Energy Management System (EMS) to complete tasks such as near real-time modeling of power systems, power flow optimization, and bad data detection and identification. . For the modeling and solution of power system state estimation, the traditional method for a long time is to model the collected known measurement and system state as a static model, and solve it by weighted least squares method, in order to obtain the whole network The operating state at a certain time section. Due to its advantages of fast convergence and easy implementation, such methods are widely used in EMS of major power syste...

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Application Information

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IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20Y04S10/22Y02E40/70Y02E60/00
Inventor 岳东陈吉窦春霞罗剑波丁孝华
Owner NANJING UNIV OF POSTS & TELECOMM