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Voltage Stability Evaluation Method Based on Thevenin Equivalence and Branch Transmission Power Limit

A Thevenin equivalent and transmission power technology, applied in the direction of instruments, complex mathematical operations, informatics, etc., can solve problems such as inapplicability, inability to represent power system voltage stability, weak theoretical foundation, etc., to reduce errors and realize online voltage The effect of the stability assessment

Active Publication Date: 2019-05-31
SHANGHAI MUNICIPAL ELECTRIC POWER CO +2
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Problems solved by technology

However, the theoretical basis of this type of method is relatively weak, so that it cannot be applied to some situations
The literature "Questions on the Validity of Several Voltage Stability Indexes Based on Local Line Information" (Proceedings of the Chinese Society for Electrical Engineering, 2009(19): 27-35) pointed out the limitations of this type of method when applied to complex power systems. The reason is that only relying on branch indicators cannot represent the voltage stability of the entire power system

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  • Voltage Stability Evaluation Method Based on Thevenin Equivalence and Branch Transmission Power Limit
  • Voltage Stability Evaluation Method Based on Thevenin Equivalence and Branch Transmission Power Limit
  • Voltage Stability Evaluation Method Based on Thevenin Equivalence and Branch Transmission Power Limit

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Embodiment

[0059] Such as figure 1 As shown, a voltage stability evaluation method based on Thevenin equivalent and branch transmission power limit, the method is: evaluate all load nodes of the power system, calculate the relative power margin of each load node, select the relative power margin The minimum value of the degree is used as the voltage stability index of the power system, and the larger the voltage stability index is, the higher the voltage stability of the power system is.

[0060] According to the technical solution of the present invention, the first step in evaluating the voltage stability of the power system is to obtain the Thevenin equivalent parameters corresponding to each load node. Select the kth load node as the evaluation object, and its load power in the initial state is: S k =P k +jQ k . Looking from the load node to the power system side, the entire power system can be equivalent to a voltage source directly connected to the load node through an impedanc...

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Abstract

The invention relates to a voltage stability assessment method based on thevenin equivalence and branch transmission power limits. The method comprises the steps of obtaining relative power margins of all load nodes of an electric system, and selecting the minimum value of the relative power margins as a voltage stability index of the electric system, wherein the larger the voltage stability index is, the higher the voltage stability of the electric system is; according to the step of obtaining the relative power margins, 1, thevenin equivalence parameters of load nodes to be assessed are obtained; 2, a two-node system containing the load nodes to be assessed is constructed by means of the thevenin equivalence parameters, a power balance equation is analyzed, and a quiescent voltage stability discriminant is obtained; 3, branch transmission power limits of the two-node system are obtained through calculation of the quiescent voltage stability discriminant, and the relative power margins of the load nodes to be assessed are obtained. Compared with the prior art, no local measurement data is needed, calculation is rapid and convenient, assessment indexes containing the limit transmission power are given, and online voltage stability assessment of a power grid is achieved.

Description

technical field [0001] The invention relates to a voltage stability evaluation method, in particular to a voltage stability evaluation method based on Thevenin equivalent and branch transmission power limit. Background technique [0002] With the rapid development of the power industry and the continuous advancement of technology, especially the in-depth implementation of smart grid construction, people have put forward higher and higher requirements for the operation of the power grid. From the perspective of voltage stability, it is an important research content in the field of power system stability analysis and control to ensure that the power system can still operate stably without voltage collapse accidents under heavy load or some specific disturbances. Modern large-scale power systems usually contain generator excitation controllers, on-load tap-changing transformers, and various flexible AC-DC transmission devices. Accurate voltage stability analysis requires the us...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/10
CPCG16Z99/00
Inventor 李禹鹏杨增辉崔勇冯楠郭强
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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