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Polynomial robust state estimation method

A robust state estimation and polynomial technology, applied to AC network circuits, electrical components, circuit devices, etc., can solve the problem that the estimation performance needs to be improved, and achieve the effect of good tolerance and high computing efficiency

Inactive Publication Date: 2017-12-15
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Application Information

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Problems solved by technology

However, the estimation performance of these robust state estimation methods still needs to be improved.

Method used

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  • Polynomial robust state estimation method
  • Polynomial robust state estimation method
  • Polynomial robust state estimation method

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Embodiment Construction

[0028] Such as figure 1 As shown, the polynomial type robust state estimation method (Polynomial State Estimate, PSE) of the present invention comprises the following steps:

[0029] Step A: Provide a polynomial robust state estimation (Polynomial State Estimate, PSE) model.

[0030] Specifically, the model of the PSE proposed by the present invention is as follows

[0031]

[0032] s.t.g(x)=0 (2)

[0033] r=z-h(x) (3)

[0034] In the formula: z∈R m For vector measurement, it often includes node injection active and reactive power, branch active and reactive power, and node voltage amplitude measurement; x∈R n is the state vector including the node voltage amplitude and phase angle (except the balance node phase angle); h: R n →R m is the nonlinear mapping from the state vector to the measurement vector; r i is the i-th element of the residual vector r; g(x):R n →R c is the zero injection power equality constraint; w i The weight measured for the i-th quantity.

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Abstract

The invention presents a polynomial robust state estimation method which comprises the steps of providing a polynomial robust state estimation model, and using a primal-dual interior point algorithm to solve the polynomial robust state estimation model. The method can effectively suppress multiple adverse data including inconsistent data in the estimation process, shows good robustness and high calculation efficiency, and is thus very suitable for practical engineering application.

Description

technical field [0001] The invention belongs to the technical field of power system scheduling automation, and in particular relates to a polynomial robust state estimation method (Polynomial State Estimate, PSE). Background technique [0002] Power system state estimation is the foundation and core of energy management systems. Now almost every large dispatch center has installed a state estimator, and state estimation has become the cornerstone of the safe operation of the power grid. Since state estimation was first proposed by foreign scholars in 1970, people have studied and applied state estimation for more than 40 years, and various state estimation methods have emerged during this period. At present, the most widely used state estimation at home and abroad is the weighted least squares (WLS) method. The WLS model is simple and easy to solve, but its robustness is poor. In order to enhance the tolerance, there are generally two methods. The first is to add bad dat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 陈艳波葛婷刘进
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)