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Power distribution network state estimation method

A network state and reactance technology, applied in the field of power systems, can solve problems that greatly affect the convergence performance of algorithms, and achieve the effects of improving convergence performance, reducing branch impedance ratios, and improving computational efficiency

Inactive Publication Date: 2018-12-07
HOHAI UNIV
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Problems solved by technology

However, this method still has the problem that the relatively large impedance of some branches affects the convergence performance of the algorithm.

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Embodiment Construction

[0038] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0039] Such as figure 1 As shown, the present invention provides a distribution network state estimation method, including the following steps:

[0040] (1) Read the network parameters to calculate the power flow, and superimpose the true value of the power flow obtained by superimposing the random noise that obeys the Gaussian distribution to obtain real-time measurement;

[0041] (2) The initial value of the node voltage, the initial value of the three-phase voltage amplitude v ABC =[1,1,1], initial value of three-phase voltage phase angle δ ABC =[0,-2 / 3π,2 / 3π];

[0042] (3) Select the optimal reference angle, and carry out the complex domain per unitization of the branch impedance and measurement data; the criterion for selecting the optimal reference angle is that the impedance ratio of the branch after per unitization is the smalles...

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Abstract

The invention discloses a power distribution network state estimation method which comprises the following steps: 1) introducing the phase angle into the reference values of the voltage and the power,and determining the value of the optimal reference angle; 2) performing the multi-domain normalization one the power and the impedance; 3) performing series compensation on the branch with larger impedance, and establishing a compensated line model; 4) determining the optimal compensation reactance of each branch; and 5) comparing the method with the least squares method and series compensation method improved multi-domain normalization method in a test algorithm to verify the superiority of the method. The method can solve the problem that a current power distribution network fast decouplingstate estimation algorithm based on multi-domain normalization has a partial branch impedance ratio absolute value and the convergence performance of the algorithm is influenced.

Description

technical field [0001] The invention belongs to the technical field of power systems, and in particular relates to a state estimation method of a power distribution system, which adopts an improved fast decoupling method of complex field per unitization to perform state estimation. Background technique [0002] In recent years, the access of distributed intermittent energy has brought great challenges to the operation and control of distribution network. In order to support a series of advanced applications such as distribution network economic operation, fault location and recovery, and demand side management, it is urgent to study state estimation technology to perceive the operating state of distribution network in real time. The continuous expansion of the distribution network and the sharp increase in the amount of measurement data will intensify the computational pressure of the traditional state estimation algorithm, and it is necessary to carry out research on a fast...

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Application Information

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IPC IPC(8): H02J3/00H02J3/38
CPCH02J3/00H02J3/381H02J2203/20
Inventor 孙国强钱嫱卫志农臧海祥
Owner HOHAI UNIV
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