Power transmission section thermal stability power limit interval identification method and system
A technology of power limit and transmission cross-section, which is applied in the direction of electrical components, circuit devices, AC network circuits, etc., and can solve the problems of poor recognition accuracy
Active Publication Date: 2020-05-05
NARI TECH CO LTD
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[0003] The invention provides a method and system for identifying thermally stable power limit intervals of transmission sections, which solves the problem of poor identification accuracy in existing methods
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[0096] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.
[0097] Such as figure 1 As shown, a method for identifying the thermal stability power limit interval of a transmission section includes the following steps:
[0098] Step 1, obtaining the section-related thermal stability model, wherein the section-related thermal stability model includes the fault of the power grid and the corresponding main power flow transfer components.
[0099] Identify the main power flow transfer elements based on the ground state and post-fault power flow, specifically, take the thermal stability investigation element whose power flow transfer ratio or load rate change is greater than the threshold under fault as the main power flow transfer element of the fault; among...
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The invention discloses a power transmission section thermal stability power limit interval identification method and system. The method comprises the steps of solving an optimization model taking theminimum power of a power transmission section under a fault as a target, and solving the lower limit of a thermal stability power limit interval based on all optimization results; and constructing asub-optimization model taking the minimum node injection active power difference before / after the fault as a target, constructing a main optimization model taking the maximum ground-state power transmission section power as a target and considering the Berders cut constraint, and iteratively solving the main optimization model and the sub-optimization model to determine the upper limit of the thermal stability power limit interval. A traditional thermal stability power limit calculation problem is converted into a nonlinear optimization problem based on Benders decomposition. The identified limit interval is more accurate, and the method has guiding significance for scheduling personnel to fully grasp a power grid safety and stability boundary, guarantee safe and stable operation of a power grid and fully utilize the power transmission capacity of the power transmission section.
Description
technical field [0001] The invention relates to a method and system for identifying thermally stable power limit intervals of a power transmission section, and belongs to the technical field of electric power system automation. Background technique [0002] The power transmission section is used as a channel for power transmission and a corridor for electrical connection. When the transmission power is too large, there may be hidden dangers to safety and stability. The power of the transmission section is a key indicator for dispatching operators to monitor the safe operation level of the power grid, while thermal stability constraints are the main factor limiting the transmission power of the transmission section. For the transmission capacity of the transmission section, when the section reaches the thermally stable power limit, the corresponding power flow adjustment methods are different, and the corresponding maximum transmission capacity is inconsistent, and the therma...
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IPC IPC(8): H02J3/00
CPCH02J3/00
Inventor 鲍颜红张金龙徐泰山薛峰徐伟任先成周海锋宋东阔洪姗姗戴玉臣袁震
Owner NARI TECH CO LTD