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Node admittance matrix eigenvalue analysis method applied to grid-connected-inverter-included parallel resonance situation

A technology of node admittance matrix and admittance matrix, applied in AC network circuits, reducing/preventing power oscillation, circuit devices, etc., can solve problems such as the inability to determine the best observation position and the best excitation position of resonance

Inactive Publication Date: 2016-04-27
HARBIN INST OF TECH
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  • Abstract
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing resonance detection method can only obtain whether the resonance occurs and the frequency at which the resonance occurs when analyzing the harmonics, but cannot determine the best observation position and the best excitation position where the resonance occurs. The invention provides A Nodal Admittance Matrix Eigenvalue Analysis Method Applied to Parallel Resonant Phenomena of Grid-connected Inverters

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  • Node admittance matrix eigenvalue analysis method applied to grid-connected-inverter-included parallel resonance situation
  • Node admittance matrix eigenvalue analysis method applied to grid-connected-inverter-included parallel resonance situation
  • Node admittance matrix eigenvalue analysis method applied to grid-connected-inverter-included parallel resonance situation

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specific Embodiment approach 1

[0038] Specific implementation mode 1: The eigenvalue analysis method of the node admittance matrix applied to the parallel resonance phenomenon of grid-connected inverters described in this implementation mode includes the following steps:

[0039] Step 1. Determine the harmonic characteristics of all components and equipment in the power distribution system including the grid-connected inverter, and judge whether there is a transformer in the power distribution system including the grid-connected inverter. Punitization, use the node method to establish a three-bus network model in the form of per unit value together with grid voltage, grid impedance, resistive, capacitive and inductive load elements, and if the judgment result is negative, use the node method to establish a three-bus network model;

[0040] Step 2. According to the node method, in the three-bus network model, establish the network node admittance matrix Y at the frequency f1 f1 The parametric equation of the...

specific Embodiment approach 2

[0074] Embodiment 2: The difference between this embodiment and the eigenvalue analysis method of node admittance matrix applied to the parallel resonance phenomenon of grid-connected inverters described in Embodiment 1 is that in step 2, according to the node method, In the three-bus network model, the network node admittance matrix Y established at frequency f1 f1 The parametric equation for is:

[0075] Y f 1 = G 11 G 12 G 13 G 21 G 22 G ...

specific Embodiment approach 3

[0077] Embodiment 3: The difference between this embodiment and the eigenvalue analysis method of the node admittance matrix applied to the parallel resonance phenomenon of grid-connected inverters described in Embodiment 1 or 2 is that in step 2, according to the node method, in the three-bus network model, the network node admittance matrix Y under the frequency f1 is established f1 The parametric equation of the network node admittance matrix Y f1 Solve the eigenvalues ​​to get the eigenvalues ​​λ k,f1 The specific process is:

[0078] At frequency f1, by the formula (Yf1-λ k,f1 E)=0, find the network node admittance matrix Y f1 The eigenvalue of , the eigenvalue λ can be obtained k,f1 ;

[0079] Among them, E represents the third-order identity matrix.

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Abstract

The invention provides a node admittance matrix eigenvalue analysis method applied to a grid-connected-inverter-included parallel resonance situation, which belongs to the field of inverter-included grid-connected resonance analysis and detection and solves a problem that the resonance generation and the resonance generation frequency can be obtained when the existing resonance detection method analyzes resonance waves, but an optimal observation position and an optimal excitation position in a resonance generation process cannot be determined. When a parallel resonance situation is analyzed in a grid-connected-inverter-included system, the system is subjected to equivalence, a branch of a three-bus system for analyzing the resonance situation of a traditional electric power system is changed into an inverter to perform analysis, thereby obtaining a node admittance matrix of the system, wherein a matrix eigenvalue and left and right eigenvectors are calculated; by analyzing the eigenvalue under every frequency, the eigenvalue under a certain frequency occurs a maximum value, so that the resonance occurs under the frequency; by analyzing left and right eigenmatrixes, the optimal observation position and an optimal excitation position are obtained. The node admittance matrix eigenvalue analysis method provided by the invention is applied to a grid-connected-inverter-included power distribution system.

Description

technical field [0001] The invention relates to the field of resonance analysis and detection including inverter grid connection. Background technique [0002] Resonance analysis and detection of multi-inverter grid connection is one of the important issues in microgrid and active distribution network, which determines the stability of microgrid and active distribution network to a certain extent. The resonance analysis method based on the spectrum analysis theory has been very mature and is widely used in the resonance analysis of circuits and traditional distribution networks. However, in practical applications, this method cannot give deep-seated reasons such as the location of the resonance and the excitation factors. However, the node admittance matrix analysis method can obtain these information by analyzing the admittance matrix of the network model of the system, so the matrix eigenvalue analysis method is better for suppressing the generation of resonance. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
CPCH02J3/24H02J2203/20
Inventor 武健尤燕飞王蕊张彩红徐殿国
Owner HARBIN INST OF TECH
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