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Bilinear WLAV (weighted least absolute value) state estimation method with equality constraints considered

A technology of state estimation and equality constraints, applied in computing, design optimization/simulation, data processing applications, etc., can solve problems that have not been reported in the literature, and achieve reduced computing efficiency, reduced accuracy, and reduced power mismatch. Effect

Inactive Publication Date: 2017-05-24
HOHAI UNIV
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Problems solved by technology

At present, the research on incorporating zero injection constraints into bilinear WLAV state estimation has not been reported in the literature

Method used

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  • Bilinear WLAV (weighted least absolute value) state estimation method with equality constraints considered
  • Bilinear WLAV (weighted least absolute value) state estimation method with equality constraints considered
  • Bilinear WLAV (weighted least absolute value) state estimation method with equality constraints considered

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Embodiment Construction

[0039] Below in conjunction with accompanying drawing, the technical scheme of invention is described in detail:

[0040] Power system state estimation is a nonlinear optimization problem, and its measurement equation can be expressed as:

[0041] z=h(x)+ε

[0042] Where: z is the m-dimensional measurement vector; x is the n-dimensional state vector; h(x) is the m-dimensional nonlinear function; ε is the m-dimensional measurement error vector. n is the dimension of the state quantity, and m is the dimension of the quantity measurement.

[0043] Combined with the characteristics of the power system, the above nonlinear equation can be decomposed into:

[0044] z=Cy+ε

[0045] y'=f(y)

[0046] y'=Dx'+ε y′

[0047] x=t(x')

[0048] In the formula: y, y′, x′ are intermediate variables; f(y) and t(x′) are nonlinear functions; C and D are constant coefficient matrices; ε y′ is the error vector of the intermediate variable y′.

[0049] State estimator measurement includes no...

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Abstract

The invention discloses a bilinear WLAV (weighted least absolute value) state estimation method with equality constraints considered; given that power mismatch of a zero injection node has important influence on power system safety estimation, zero injection constraint is added to bilinear WLAV state estimation in equality constraint form; the method retains the original high calculating efficiency of bilinear WLAV state estimation, may also reduce the power mismatch of the zero injection node and has partly improved robust performance; it is verified based on IEEE (Institute of Electrical and Electronic Engineers) standard system and simulation results for an actual province-level network of China that the method is effective in reducing power mismatch of a zero injection node.

Description

technical field [0001] The invention relates to a bilinear WLAV state estimation method considering equality constraints, belonging to the field of power system state estimation. Background technique [0002] Power system state estimation is the core basic module of energy management system, accurate state estimation results can provide guarantee for real-time analysis and control of modern power grid. There are many zero-injection nodes in the actual power system. Theoretically, the injection power of zero-injection nodes is strictly zero. The state estimation results on these nodes cannot satisfy the power flow equation, which will affect the subsequent safety assessment results. Therefore, how to ensure that the state estimation results better comply with the zero-injection constraints is worthy of further study. [0003] At present, the widely studied methods for dealing with zero-injection constraints mainly include the large weight method and the Lagrange multiplier m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06Q50/06
CPCG06F30/20G06Q50/06
Inventor 孙国强沈甜甜卫志农臧海祥陈胜陈醒
Owner HOHAI UNIV
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