A method and system for identifying thermally stable power limit intervals of transmission sections
A technology of power limit and transmission section, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as poor identification accuracy, achieve the effect of accurate limit range and ensure safe and stable operation
Active Publication Date: 2021-11-30
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 method and system for identifying thermally stable power limit intervals of a power transmission section. Solve the optimization model with the goal of minimizing the power of the transmission section under a fault, and solve the lower limit of the thermally stable power limit interval based on all optimization results; construct a sub-optimization model with the goal of minimizing the difference between the injected active power of the node before and after the fault, and construct a transmission section based on the ground state The main optimization model with the maximum power as the goal and considering the Benders cut constraint, iteratively solves the main and sub-optimization models to determine the upper limit interval of the thermally stable power limit; transforms the traditional thermally stable power limit calculation problem into a non-linear one based on Benders decomposition For linear optimization problems, the identified limit interval is more accurate, which is of guiding significance for dispatchers to fully grasp the safety and stability boundary of the power grid, ensure the safe and stable operation of the power grid, and make full use of the power transmission capacity of the 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