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Method for evaluating operation status of power system by utilizing probability tide

A power system, probabilistic power flow technology, applied in the direction of AC network circuits, electrical components, circuit devices, etc., can solve problems such as difficult operating conditions

Active Publication Date: 2014-12-10
INSIGMA INNOVATION RES DEV +3
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  • Description
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Problems solved by technology

However, there is currently no probabilistic power flow model that can simultaneously consider the output power of wind power generation and photovoltaic power generation, as well as the stochastic characteristics of electric vehicle charging and discharging power. Difficulty

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  • Method for evaluating operation status of power system by utilizing probability tide
  • Method for evaluating operation status of power system by utilizing probability tide
  • Method for evaluating operation status of power system by utilizing probability tide

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Embodiment Construction

[0038] The method of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0039] The present invention utilizes the method for assessing the operation state of the power system by using the probability power flow to comprise the following steps:

[0040] Step 1: Construct the probabilistic power flow model shown in formula (1):

[0041] P Gi , t - P Di , t - V i , t Σ j ...

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Abstract

The invention discloses a method for evaluating the operation status of a power system by utilizing a probability tide. The method comprises the following steps of 1, building a probability tide calculation model shown in formula (1); 2, carrying out solution on the probability tide model by adopting a three-point estimation method to obtain node voltage probability distribution of the power system and branch tide probability distribution of the power system; and 3, respectively comparing the node voltage probability distribution of the power system with a higher limit value and a lower limit value of voltages in each node of the power system to obtain a probability summation Pv of each node voltage exceeding a region formed by the higher and the lower limit values of each node voltage; respectively carrying out comparison on the branch tide probability distribution with the higher and the lower limit values of each branch tide in the power system to obtain the probability summation Pl of each node branch tide exceeding the region formed by the higher and the lower limit values; if all Pv and all Pl are less than or equal to an exceeding limit threshold that the power system normally operates, the power system is indicated to normally operate; and if not, the power system is indicated to abnormally operate.

Description

technical field [0001] The invention belongs to the field of power system operation, and relates to a method for evaluating the power system operation status by using probability flow. Background technique [0002] Probabilistic power flow comprehensively considers the uncertainty of changes in variables such as power system network topology, component parameters, node load values, and generator output, and can obtain probability statistics such as line overload and bus overvoltage, which are useful for discovering and solving power system problems. Potential problems and weaknesses of the company play an important role. So far, probabilistic power flow calculation has been successfully applied in many aspects of power system analysis, such as network loss analysis, reliability assessment, probability analysis of available transmission capacity, transient stability analysis, etc. However, there is currently no probabilistic power flow model that can simultaneously consider ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00H02J3/38
CPCY02B10/14Y02B10/10
Inventor 吴晨曦文福拴刘巧萍
Owner INSIGMA INNOVATION RES DEV
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