Parameter estimation for and use of a thermal model of a power line
First Claim
1. A method of estimating model parameters (A, B, . . . ;
- Cl, . . . ) of a thermal model of a power line, comprising;
measuring values of an electrical quantity (l, P) of the power line and of meteorological quantities (Ta, S, W) representing ambient conditions of the power line;
calculating values of the model parameters from said measured values;
measuring, repeatedly during operation of the power line, momentary values (li, Tai, Si, Wi) of the electrical and meteorological quantities;
measuring concurrently a momentary value (Tli) of a temperature (Tl) of the power line; and
calculating, repeatedly during operation of the power line, the values (Ai, Bi;
. . . ;
Cli, . . . ) of the model parameters from said measured values.
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Accused Products
Abstract
A relationship between a temperature Tl of a power line or power transmission conductor 10, an electrical quantity of the power line such as a current l or power flow P through the power line, as well as meteorological quantities or ambient conditions of the power line such as wind speed W, wind direction, humidity, solar radiation S and ambient temperature Ta, is established in the form of a thermal model of the power line. Values of the aforementioned quantities or variables are continuously measured, and the collected values of the quantities are evaluated in order to update model parameters of the thermal model during operation of the power line. In an exemplary embodiment, an average temperature representative of the entire line is determined via two phasor measurement units (PMU) 11, 11′ providing synchronized phasor values from two ends of the power line. An ohmic resistance of the power line can be computed from the phasor values, from which in turn the average line temperature can be derived.
57 Citations
17 Claims
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1. A method of estimating model parameters (A, B, . . . ;
- Cl, . . . ) of a thermal model of a power line, comprising;
measuring values of an electrical quantity (l, P) of the power line and of meteorological quantities (Ta, S, W) representing ambient conditions of the power line;
calculating values of the model parameters from said measured values;
measuring, repeatedly during operation of the power line, momentary values (li, Tai, Si, Wi) of the electrical and meteorological quantities;
measuring concurrently a momentary value (Tli) of a temperature (Tl) of the power line; and
calculating, repeatedly during operation of the power line, the values (Ai, Bi;
. . . ;
Cli, . . . ) of the model parameters from said measured values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
- Cl, . . . ) of a thermal model of a power line, comprising;
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17. A method of estimating a parameter of a thermal model of a power line, comprising:
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measuring a value of an electrical quantity of the power line and at least one meteorological quantity representing an ambient condition of the power line;
calculating a value of the parameter of the thermal model from said electrical quantity and said meteorological quantity;
measuring, during operation of the power line, a momentary value of each the electrical quantity an the meteorological quantity;
measuring a momentary value of a temperature of the power line; and
calculating, during operation of the power line, a value of the parameter from said measured values of the electrical quantity, the meteorological quantity and the temperature.
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Specification