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A Stability Analysis Method of Three-Phase Inverter Considering Impedance Coupling

A technology of three-phase inverter and analysis method, which is applied in the direction of output power conversion device, conversion of AC power input to DC power output, electrical components, etc., and can solve problems such as inconsistencies in system stability results

Active Publication Date: 2020-06-30
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

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  • A Stability Analysis Method of Three-Phase Inverter Considering Impedance Coupling
  • A Stability Analysis Method of Three-Phase Inverter Considering Impedance Coupling
  • A Stability Analysis Method of Three-Phase Inverter Considering Impedance Coupling

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Embodiment 1

[0148] System Simplification Method Based on Feedback Ratio Matrix

[0149] Compared with the disadvantages 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. Firstly, its origin is deduced, and the boundary conditions for the method to be established are given.

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

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

[0152]

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

[0154] The method of the simplified feedback ratio matrix L (s) that the present invention proposes can be equivalent to under the situation that the system is equivalent to equation (15), in Figure 8 The feedback ...

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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 power (DPG) such as wind power and solar energy, a large number of DPGs are connected to large power grids in various forms, and the system stability problems caused by them are diversified, such as low frequency instability and harmonic instability. Stability and lateral 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 side, the system is stable, but it needs to obtain all parameters of the system including control parameters and passivity parameters. When the system is connected to th...

Claims

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Application Information

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Patent Type & Authority Patents(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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