Electrical power transmission
First Claim
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1. A method of determining power transfer limits in an electrical power transmission system including a plurality of power lines, comprising:
- (a) deriving mode dynamic characteristics on a selection of the lines from measurement of small perturbations in power system operational parameters on said lines over a period of time;
(b) measuring the power system operational parameters on some or all of the said lines over said period of time;
(c) using the data collected in (a) and (b) to establish fixed relationships between the dynamic characteristics and the operational parameters in each of said lines; and
(d) calculating from each of said relationships the power transfer limit for each line.
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Abstract
There is described a method of monitoring high voltage electrical power system. The method involves measuring small signal power system characteristics under prevailing systems conditions and determining the power transfer limits using said measurements.
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Citations
13 Claims
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1. A method of determining power transfer limits in an electrical power transmission system including a plurality of power lines, comprising:
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(a) deriving mode dynamic characteristics on a selection of the lines from measurement of small perturbations in power system operational parameters on said lines over a period of time;
(b) measuring the power system operational parameters on some or all of the said lines over said period of time;
(c) using the data collected in (a) and (b) to establish fixed relationships between the dynamic characteristics and the operational parameters in each of said lines; and
(d) calculating from each of said relationships the power transfer limit for each line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of identifying the source of an oscillation in an electrical power transmission system, comprising:
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(a) deriving one or more of the mode damping, mode amplitude and mode frequency from measurements of the real power, reactive power, voltage, current or frequency signals at first and second points in the system;
(b) comparing the mode damping, mode amplitude or mode frequency of the signals to determine whether the oscillation source is closer to the first point or the second point; and
(c) repeating steps (a) and (b) until the source is identified. - View Dependent Claims (12)
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13. A method of determining power transfer limits in an electrical power transmission system including a plurality of power lines, comprising:
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(a) deriving mode damping values on a selection of the lines by measuring small perturbations on said lines over a period of time;
(b) measuring the power flow on the said lines over said period of time;
(c) using the data collected in (a) and (b) to establish fixed relationships between the mode damping values and the power flow in each of said lines; and
(d) calculating from each of said relationships the power transfer limit for each line.
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Specification