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Power grid risk analysis method based on node marginal electricity prices

A risk analysis and node technology, applied in the field of power grid, can solve problems such as unsystematic risk security assessment

Inactive Publication Date: 2019-04-16
GUIZHOU POWER GRID CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Most of the existing technologies do not conduct security assessments on system risks

Method used

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  • Power grid risk analysis method based on node marginal electricity prices
  • Power grid risk analysis method based on node marginal electricity prices
  • Power grid risk analysis method based on node marginal electricity prices

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Experimental program
Comparison scheme
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Embodiment Construction

[0066] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0067] 1 Calculation of node marginal electricity price based on AC power flow

[0068] Taking the minimum sum of coal consumption cost, pollution treatment cost and load loss compensation cost as the optimization objective function of the system, the following constraints are considered: balance of active power and reactive power, upper and lower limits of unit output, unit climbing, upper and lower limits of load shedding , upper and lower limits of node voltage and line flow constraints based on AC power flow, etc., a dynamic optimal model of power grid day-ahead economic scheduling is established:

[0069]

[0070] In this model, T is the total number of time periods; m is the number of nodes; a i , b i and c i is the coefficient of the coal consumption cost function of the generator set; k i is the coefficient of pollution treat...

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Abstract

The invention relates to a power grid risk analysis method based on a node marginal electricity price, and belongs to the field of power grids. The method calculates the marginal electricity price andthe output of the generator based on the original dual-point internal point method optimal power flow model, and solves the single risk evaluation index under the high-risk N-3 fault operation statethrough the nonlinear programming method, and further calculates the joint entropy index. Comprehensive risk assessment of the grid. The method uses the power load data of a city for one month to scanthe high-risk N-3 line fault scenario, so that the risk assessment can consider most of the possible situations, and the result is closer to reality; the comprehensive risk index solved includes thedouble index. Combined weighted entropy, this indicator takes into account the combined influence of power flow distribution, load loss and congestion severity on grid risk level and self-organized criticality, which makes up for the lack of individual indicator analysis.

Description

technical field [0001] The invention belongs to the field of power grids, and relates to a grid risk analysis method based on node marginal power prices. Background technique [0002] In the gradually open electricity market environment, uncertain factors affecting power grid planning and scheduling are becoming more and more prominent: randomness of power output, fluctuations in load and electricity prices, failure of power grid equipment, changes in costs, etc. These uncertain factors not only cause the randomness of the market operation and the change of the power grid operation mode, but also make it difficult for the dispatcher to accurately quantify the real risk of the system, which increases the pressure on its correct operation, and the system function loss caused by the failure of the system components, Seriously affect the power supply reliability of the power system and bring huge losses to the society. In the electricity market environment, static security anal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G06Q50/06
CPCG06Q10/0635G06Q50/06Y04S10/50Y02E40/70
Inventor 田年杰苏华英代江李赟汪明清刘明顺赵翔宇郑全朝王成佐张楠李振邦龙志敏
Owner GUIZHOU POWER GRID CO LTD
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