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Alternating current/direct current hybrid microgrid probability load flow method of island operation

A technology of AC-DC hybrid and probability flow, which is applied to AC networks and electrical components with the same frequency from different sources, and can solve problems such as approximate non-Gaussian random variables

Active Publication Date: 2019-06-28
STATE GRID GASU ELECTRIC POWER RES INST +1
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Problems solved by technology

However, the traditional unscented transformation adopts a symmetric sampling strategy, which obviously cannot be used to accurately approximate non-Gaussian random variables that obey an asymmetric distribution

Method used

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  • Alternating current/direct current hybrid microgrid probability load flow method of island operation
  • Alternating current/direct current hybrid microgrid probability load flow method of island operation
  • Alternating current/direct current hybrid microgrid probability load flow method of island operation

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Embodiment 1

[0096] see Figure 1 to Figure 2 , a probabilistic power flow method for AC / DC hybrid microgrids operating in isolated islands, which mainly includes the following steps:

[0097] 1) Establish the power flow calculation model of the AC / DC hybrid microgrid according to the basic data of the AC / DC hybrid microgrid, and determine the random input variable X=[X 1 , X 2 ,...,X n ].

[0098] The power flow calculation model of the AC / DC hybrid microgrid mainly includes the AC / DC power flow equation of the AC / DC hybrid microgrid system, the control equation of the drooping node, the connection node equation of the AC / DC system, the conversion equation of light-photovoltaic power generation and wind speed-wind force Power conversion equation.

[0099] In the power flow calculation model of the AC / DC hybrid microgrid, record the unbalanced amount of active power on the AC side as ΔP ac , the unbalanced amount of active power on the DC side is ΔP ac , the reactive power imbalance ...

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Abstract

The present invention discloses an alternating current / direct current (AC / DC) hybrid microgrid probability load flow method of island operation. The method mainly comprises the steps of: 1) determining a random input variable X of a load flow calculation model; 2) calculating an input variable matrix R obeying any distribution; 3) inputting a kth column of the matrix R into a determinacy load flowmodel of the AC / DC hybrid microgrid for load flow calculation; 4) setting convergence precision [delta]d, and determining whether the maximum value of the power unbalance absolute value is convergedor not, if yes, stopping the determinacy load flow calculation, and turning to the step 5); and 5) after iteration is stopped, making k=k+1, and returning the step 4 until each column of an original domain sample point matrix R is subjected to determinacy load flow calculation, and outputting a final load flow result. The problem is solved that the AC / DC hybrid microgrid has an indeterminacy source with high dependency so as to perform probability load flow analysis for the AC / DC hybrid microgrid and ensure the safe and reliable operation.

Description

technical field [0001] The invention relates to the field of uncertainty analysis of new energy sources, in particular to a probabilistic power flow method for an AC / DC hybrid micro-grid operating in isolated islands. Background technique [0002] For the Hybrid AC / DC microgrid, there are generally two operation modes: grid-connected operation and island operation. During grid-connected operation, the frequency of the microgrid can be supported by the main grid, and at the same time, the power of the network can be balanced through the balance node of the main grid. When operating in an isolated island, the power balance of the system and the stability of the AC side frequency need to be realized by controlling the power generation equipment of the microgrid. Generally speaking, droop control is a main control method of the microgrid in the island operation state. Its advantage is that the power supply under droop control on the AC side only needs the frequency of the syste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J5/00H02J3/06
Inventor 杨勇刘福潮林星宇舒铜秦睿杨云郑晶晶梁福波张建华彭晶唐俊杰
Owner STATE GRID GASU ELECTRIC POWER RES INST
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