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Temperature state estimation method based on automatic differentiation

A state estimation and automatic differentiation technology, applied in the direction of AC network circuits, electrical components, circuit devices, etc., can solve problems such as error-prone, low efficiency, and cumbersome work, and achieve the effects of improving accuracy, improving development efficiency, and avoiding truncation errors

Inactive Publication Date: 2016-09-28
STATE GRID CORP OF CHINA +3
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Problems solved by technology

The disadvantage of this method is that when calculating the Jacobian matrix, it is necessary to manually derive the differential formula and write the differential code, which is cumbersome, error-prone, and inefficient.
When the branch temperature is added as a new state quantity, the Jacobian elements will be more complicated, and the shortcomings of this method are also more obvious

Method used

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  • Temperature state estimation method based on automatic differentiation
  • Temperature state estimation method based on automatic differentiation
  • Temperature state estimation method based on automatic differentiation

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Embodiment Construction

[0030] Below in conjunction with accompanying drawing, the technical process of invention is described in detail:

[0031] Generally, the resistance of metal conductors has the following relationship with temperature:

[0032]

[0033] where R is the resistance of the conductor, t is the temperature of the conductor, R Ref is the resistance of the conductor at the reference temperature, t Ref is the reference temperature, t F It is a fixed temperature (generally copper wire is 234.5°C, hard aluminum wire is 228.1°C, and aluminum transformer winding is 225.0°C).

[0034] Well-known thermal resistance models such as figure 2 As shown, the thermal coupling phenomenon of the device is depicted. In the thermal resistance model, the increase in temperature of the device is approximately linear with the loss of the device, and the coefficient is R θ , expressed as follows:

[0035]

[0036] Among them, t Rise is the temperature of the device above the external environme...

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Abstract

The invention provides a temperature state estimation method based on automatic differentiation (AD). In a traditional state estimation calculation process, the line resistance is always invariant. The transmission line resistance changes with the change of external temperature. According to the invention, temperature used as a new state quantity is introduced into the state estimation process to establish a state estimation model considering temperature changes; in addition, a Jacobian matrix for calculating a measurement function is required in the state estimation; since a branch temperature variable is taken into account, massive differential functions are manually calculated and a differential code is written, which is too cumbersome and error-prone; AD is used to replace the traditional manually-calculated Jacobian matrix, which reduces cumbersome manual coding and error probability and effectively avoids a truncation error; the efficiency of program development is improved; and the method is easily combined with the existing state estimation software.

Description

technical field [0001] The invention relates to a temperature state estimation method based on automatic differential technology, which belongs to the technical field of power system operation and control. Background technique [0002] As the core of the Energy Management System (EMS), the state estimation of the power system obtains the best estimated value of the state quantity through the processing of raw data. The traditional Weighted Least Squares (WLS) state estimation algorithm has good estimation quality and convergence performance. It is a classic solution and theoretical basis for state estimation and is suitable for various types of measurement systems. [0003] In the traditional state estimation calculation process, it is assumed that the resistance parameters of the transmission line are always constant, and the calculation is performed with a constant grid node admittance matrix. However, according to the relevant research on electrothermal coupling, the tem...

Claims

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Application Information

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IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 胥峥何菲
Owner STATE GRID CORP OF CHINA
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