Calculation method for second-order sensitivity of distribution network voltage based on holomorphic function embedding method

A calculation method and technology of distribution network, applied in the field of electric power information, to achieve good economy, reduce system network loss, and less investment

Active Publication Date: 2021-12-10
HANGZHOU DIANZI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Calculation method for second-order sensitivity of distribution network voltage based on holomorphic function embedding method
  • Calculation method for second-order sensitivity of distribution network voltage based on holomorphic function embedding method
  • Calculation method for second-order sensitivity of distribution network voltage based on holomorphic function embedding method

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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 method for calculating the second-order voltage sensitivity of a distribution network based on HELM. The invention first uses HELM to calculate the power flow of distribution network, and then calculates the first-order nonlinear sensitivity of voltage according to the sensitivity calculation method based on HELM. The voltage second-order sensitivity is then calculated from the voltage first-order nonlinear sensitivity. The invention considers the non-linear factor of sensitivity by using the HELM method, can consider the interaction between nodes, and avoids the problem of falsely high sensitivity. This method can be used for the selection of reactive power compensation points in the distribution network, reactive power optimization and voltage control, new energy access and voltage control, etc. The selection of reactive power compensation points is more reasonable, and the compensation scheme is more economical , further reducing the network loss, can provide a reasonable control coefficient for voltage control, improve voltage level and power factor, and have high theoretical significance and application value for reactive power optimization and voltage control of distribution network.

Description

technical field [0001] The invention belongs to the technical field of electric power information, and relates to a second-order sensitivity calculation method of distribution network voltage based on a holomorphic function embedding method. 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-ti...

Claims

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Application Information

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Patent Type & Authority Patents(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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