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Hyperbolic cosine type robust state estimation method for power system state

A technology of robust state estimation and hyperbolic cosine, which is applied to electrical components, circuit devices, AC network circuits, etc., and can solve problems such as estimation performance needs to be improved

Active Publication Date: 2016-04-20
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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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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  • Hyperbolic cosine type robust state estimation method for power system state
  • Hyperbolic cosine type robust state estimation method for power system state
  • Hyperbolic cosine type robust state estimation method for power system state

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Experimental program
Comparison scheme
Effect test

Embodiment

[0065] It is set to test the performance of COSH based on primal-dual interior point algorithm using IEEE standard system. The test adopts full measurement, and the measurement value is obtained by superimposing white noise (mean value is 0, standard deviation is τ) on the result of power flow calculation. For voltage measurement, take τ V =0.005p.u.; for power measurement, take τ PQ = 1MW / MVar. The test environment is a PC, the CPU is Intel(R) Core(TM) i3M370, the main frequency is 2.40GHz, and the memory is 2.00GB.

[0066] 1. Comparison of tolerance performance

[0067] The inventors compared COSH of the present invention with other state estimators to test the robustness of COSH.

[0068] Set 4 bad consistency data on IEEE-14 system (P 1-2 , Q 1-2 ,P 1 , Q 1 ). Table 1 shows the set bad measurement value and the correct value of measurement.

[0069] Table 1 COSH's identification of data with poor consistency in IEEE14 systems

[0070]

[0071] As a compariso...

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Abstract

The invention, which belongs to the scheduling automation field of the power system, discloses a hyperbolic cosine type robust state estimation method for a power system state. The method comprises: an injected circuit active power, an injected circuit reactive power, a branch active power, and a branch reactive power of a power system node and a node voltage amplitude parameter are extracted; a hyperbolic cosine type robust state estimation model is established; and the hyperbolic cosine type robust state estimation model is solved by using a primal-dual interior-point algorithm. The calculation example analysis demonstrates that a plurality of bad data including data with poor consistency can be suppressed effectively during the estimation process, so that the good robustness is displayed. Moreover, the calculation efficiency is improved; and the method is suitable for practical engineering application.

Description

technical field [0001] The invention belongs to the field of electric power system scheduling automation, and in particular relates to a hyperbolic cosine type robust state estimation method for the electric power system state. 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. [0003] At present, the most widely used state estimation at home and abroad is the weighted least squares method (Weighted least squares, WLS). The WLS model is simple and easy to solve, but its robustness is poor. In order to enhance the tolerance, there are gene...

Claims

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Application Information

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IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 陈艳波张籍晋文杰马进刘洋谢瀚阳
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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