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Three-phase inverter stability analysis method considering impedance coupling

A three-phase inverter, analysis method technology, applied in the output power conversion device, AC power input conversion to DC power output, electrical components and other directions, can solve problems such as inconsistent system stability results

Active Publication Date: 2019-03-08
GUANGDONG YADA ELECTRONICS +1
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Problems solved by technology

[0060] From the above analysis, it can be seen that there are two different results in the judgment results of the traditional feedback ratio matrix ignoring the impedance coupling. Analyzed system stability results are inconsistent

Method used

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  • Three-phase inverter stability analysis method considering impedance coupling
  • Three-phase inverter stability analysis method considering impedance coupling
  • Three-phase inverter stability analysis method considering impedance coupling

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Embodiment 1

[0148] System Simplification Method Based on Feedback Ratio Matrix

[0149] Compared with the shortcomings of the traditional impedance decoupling method, the present invention proposes a simplified method based on the feedback ratio matrix to judge the stability of the system. First derive its origin and give the boundary conditions for the establishment of the method.

[0150] Principle of System Simplification Method Based on Feedback Ratio Matrix

[0151] Formula (1) can be sorted into a different expression form from formula (2), such as formula (15)

[0152]

[0153] For equation (15), if Without the pole on the right half, the stability of the system can be determined by Determined, its equivalent control block diagram is as Picture 8 .

[0154] The simplified feedback ratio matrix L(s) method proposed by the present invention can be equivalent to when the system is equivalent to equation (15), Picture 8 The feedback system adds an additional disturbance Δδ(s) in the feedbac...

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Abstract

The invention discloses a three-phase inverter stability analysis method considering impedance coupling, wherein the three-phase inverter comprises a three-phase inverter module and an LC filter, theAC side of the inverter module is connected to the power grid through the LC filter, and the method comprises the following steps: step 1: calculating the feedback ratio matrix L1(s); and step 2: determining, and using the L1(s) for system design and judgment stability if the criterion phase angle and criterion gain of the L1(s) meet the preset conditions. The three-phase inverter stability analysis method considering impedance coupling is high in stability analysis method, easy to implement, and wide in application range.

Description

Technical field [0001] The invention relates to a three-phase inverter stability analysis method considering impedance coupling. Background technique [0002] With the rapid development of distributed energy sources (DPG) such as wind power and solar energy, a large number of DPGs are connected to the large power grid in various forms, and the system stability problems caused by them are diversified, such as low-frequency instability caused by low-frequency instability and non-harmonics. Stability and side instability, etc. [0003] The existing stability analysis methods can be roughly divided into two categories: [0004] 1) Eigenvalue analysis method and impedance stability analysis method. For the eigenvalue analysis method, the system matrix is ​​obtained by establishing state space modeling. If the matrix does not have a pole on the right half, the system is stable, but it needs to obtain all the parameters of the system including control parameters and passive parameters. Wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02J3/38
CPCH02J3/38H02M7/5387
Inventor 于晶荣林显富余若雪陈斌杨伟粟梅
Owner GUANGDONG YADA ELECTRONICS
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