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EHS-containing island type AC/DC hybrid micro-grid system reliability evaluation method

An AC-DC hybrid and reliable technology, applied in AC network circuits, AC network load balancing, DC network circuit devices, etc., can solve problems such as no reliability evaluation, and achieve the effect of improving operation stability

Active Publication Date: 2021-07-20
HEBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research on the island type AC-DC hybrid microgrid with EHS is focused on system optimization, economic operation and power coordination control, etc., and there is no research on its reliability evaluation. Therefore, it is urgent to carry out research on the island type with EHS Research on Reliability Evaluation of AC-DC Hybrid Microgrid

Method used

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Embodiment 1

[0075]Step 1. Input system model parameters: In this embodiment, the system model includes wind turbine, photovoltaic and battery output models in addition to the EHS model and load model. Among them, assuming that the wind speed obeys the two-parameter Weibull distribution, the scale parameter is 3.97, the shape parameter is 10.7, and the fan output model is as follows:

[0076]

[0077] In formula (11), P WT (t) is the output power of the fan at time t, P r is the rated power of the fan; v in , v r and v o They are cut-in wind speed, rated wind speed and cut-out wind speed respectively, which are 3m / s, 15m / s and 25m / s.

[0078] The output model of photovoltaic power generation is as follows:

[0079]

[0080] In formula (12), α and β are the shape parameters of the Beta distribution, which are 2 and 0.8 respectively; is the maximum output power of the PV.

[0081] Establish a probabilistic simulation model for the charging and discharging characteristics of the...

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Abstract

The invention discloses an EHS-containing island type AC / DC hybrid micro-grid system reliability evaluation method. The method comprises the following steps: firstly, establishing system models such as an EHS model and a load model for an island type AC / DC hybrid micro-grid system connected with the EHS; secondly, performing fault component classification through a sequential Monte Carlo method; thirdly, considering the operation characteristics of the system, the coupling effect of the EHS and the system and the uncertainty of the system source network load, and proposing a power scheduling strategy; and finally, from two perspectives of a system level and an equipment level, providing a system level reliability index and an equipment level reliability index for evaluating the reliability of the system, so as to solve the problem that the reliability of theEHS-containing island type AC / DC hybrid micro-grid systemcannot be accurately evaluated at present. The system operation stability, the new energy acceptance capability and the accuracy and comprehensiveness of reliability evaluation are improved, and meanwhile, unified scheduling of the power grid to the distributed power supply is also facilitated.

Description

technical field [0001] The invention belongs to the field of comprehensive energy systems, in particular to a method for evaluating the reliability of an island-type AC-DC hybrid micro-grid system including EHS. Background technique [0002] The reliability assessment of AC / DC hybrid microgrid is the basis of system planning and operation, and an important pillar to deal with the uncertainty of source, grid and load and ensure the reliable operation of the system. However, the island-type AC-DC hybrid microgrid usually replaces the large power grid with power generation equipment with controllable output (such as micro gas turbines). Since these power generation equipment have limited operating power and cannot satisfy the two-way flow of power, the system The phenomenon of wind and light abandonment will occur in the grid; and when the wind and solar resources of the system are insufficient, load shedding will occur, which will lead to a significant drop in the reliability ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/28H02J3/32G06F30/20G06F111/08G06F113/04
CPCH02J3/388H02J3/28H02J3/32G06F30/20H02J2203/20H02J2300/24H02J2300/28H02J2300/40H02J2300/30G06F2111/08G06F2113/04G06F2119/02Y02E10/56
Inventor 岳大为袁行行李练兵赵文体
Owner HEBEI UNIV OF TECH
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