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Power distribution network second-order voltage sensitivity calculation method based on HELM

A technology of voltage sensitivity and calculation method, applied in the field of power information

Active Publication Date: 2020-09-18
HANGZHOU DIANZI UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, how to use HELM to calculate related sensitivity and reactive power optimization, there is no relevant literature research

Method used

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  • Power distribution network second-order voltage sensitivity calculation method based on HELM
  • Power distribution network second-order voltage sensitivity calculation method based on HELM
  • Power distribution network second-order voltage sensitivity calculation method based on HELM

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Embodiment Construction

[0110] The present invention will be further described below in conjunction with accompanying drawing.

[0111] a. Reference figure 1 , the present invention follows the steps:

[0112] b. Step (1): Establish a mathematical model of the distribution network:

[0113]

[0114]

[0115] In the formula: P i , Q i , V i respectively inject active power, reactive power and voltage at node i; G ij , B ij ,δ ij Respectively, conductance, susceptance and phase angle difference between nodes i and j; N is the total number of nodes.

[0116] c. Use HELM (holomorphic function embedding method) for power flow calculation.

[0117] From the nodal power equation

[0118]

[0119] Constructs an inline pure virtual function

[0120]

[0121] suppose

[0122] When s=0, you can get:

[0123]

[0124] From this formula we can find c k [0].

[0125]

[0126] According to the coefficients of the S series are equal, it can be known that d k [0]=1 / c k [0].

[012...

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Abstract

The invention discloses a power distribution network second-order voltage sensitivity calculation method based on HELM. According to the invention, the method comprises the steps: employing HELM for calculating the power flow of a power distribution network, and then calculating the first-order nonlinear sensitivity of the voltage according to a sensitivity calculation method based on the HELM; calculating voltage second-order sensitivity according to the voltage first-order nonlinear sensitivity. The HELM method is utilized to consider nonlinear factors of sensitivity, interaction between nodes can be considered, and the problem of virtual high sensitivity is avoided. The method can be used for selecting reactive compensation points of the power distribution network; reactive power optimization and voltage control are carried out; according to the invention, problems such as access of new energy, voltage control and the like are solved, selection of reactive compensation points is more reasonable, the economical efficiency of a compensation scheme is better, the network loss is further reduced, a reasonable control coefficient can be provided for voltage control, the voltage leveland the power factor are improved, and the method has higher theoretical significance and application value for reactive optimization and voltage control of a power distribution network.

Description

technical field [0001] The invention belongs to the technical field of electric power information, and relates to a method for calculating second-order sensitivity of distribution network voltage based on HELM (holomorphic function embedding). Background technique [0002] At present, voltage sensitivity is often used as the basis for voltage control and voltage stability analysis in distribution network voltage control and voltage stability analysis. The traditional voltage sensitivity is often calculated according to the Jacobian matrix. This voltage sensitivity is related to the load conditions. When the conventional power flow calculation encounters the ill-conditioned power flow, the voltage sensitivity cannot be calculated. [0003] In voltage control, voltage sensitivity sorting is often used as the basis for selecting control objects and designing control parameters [1-3]. Whether voltage sensitivity needs to be calculated and updated in real time according to real-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/06H02J3/18
CPCH02J3/06H02J3/1871H02J2203/20H02J2203/10Y02E40/30
Inventor 高慧敏陈健琳赵嘉敏罗平吴晨曦
Owner HANGZHOU DIANZI UNIV
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