Impedance measurement method of pmsg grid-connected system under weak grid

A technology of impedance measurement and weak power grid, applied in the direction of measuring resistance/reactance/impedance, measuring devices, measuring electrical variables, etc., can solve problems such as insufficient accuracy, complex measurement of sequence impedance model, etc., and achieve the effect of accurate stability analysis

Active Publication Date: 2022-06-03
BEIJING INSTITUTE OF TECHNOLOGYGY +2
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  • Abstract
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  • Claims
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Problems solved by technology

Using the impedance analysis method, it is first necessary to obtain the sequence impedance model of the system, which needs to take into account the circuit topology and control methods of each link, so the measurement of the sequence impedance model is more complicated
In addition, considering that the permanent magnet direct drive wind turbine converter will produce a machine-grid coupling effect after being integrated into the weak grid, which will lead to the interaction between the positive sequence voltage and current in the grid-connected system and the coupled voltage and current, so only the positive sequence Impedance is not accurate enough for stability analysis of the system

Method used

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  • Impedance measurement method of pmsg grid-connected system under weak grid
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  • Impedance measurement method of pmsg grid-connected system under weak grid

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Embodiment Construction

[0035] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0036] like figure 1 As shown, a method for measuring impedance of a PMSG grid-connected system under a weak grid of the present invention includes the following steps:

[0037] Step 1. Obtain the circuit parameters and control parameters of the permanent magnet direct drive wind turbine converter in the weak grid. It can be understood that, in the example of the present invention, these parameters can be obtained by means of measurement or consulting manuals. Among them, the circuit parameters are: DC voltage V dc , filter inductance L f , filter inductor resistor R f , filter capacitor C f , the weak grid impedance Z g (s); control parameters are: voltage loop PI control parameter K vp , K vi , the current loop PI control parameter K ipd , K iid , K ipq , K iiq , the current loop decoupling coefficient K d ;in, s=j·2πf, f represents the...

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Abstract

The invention discloses an impedance measurement method of a PMSG grid-connected system under a weak power grid. Aiming at the converter device of the permanent magnet direct drive wind turbine on land, the AC port of the converter is measured at the connection point between the AC converging side of the converter and the weak power grid. Sequence impedance model. This method regards the output voltage of the machine-side converter as a DC voltage source, measures the positive-sequence impedance model and coupling impedance model of the grid-side converter, and considers the machine-grid coupling effect in the weak grid. The impedance is converted to the positive sequence impedance to form an equivalent sequence impedance model, which solves the problem of obtaining the sequence impedance model of the AC port of the onshore permanent magnet direct drive wind turbine converter under a weak grid. The impedance measurement device designed in the present invention can quickly and accurately obtain the sequence impedance model of the AC port of the onshore permanent magnet direct-drive wind turbine converter under a weak power grid, taking into account the influence of the machine-grid coupling effect, so that it can be more accurately based on the sequence impedance model. Stability Analysis.

Description

technical field [0001] The invention belongs to the technical field of new energy grid-connected system analysis and control, and in particular relates to an impedance measurement method of a PMSG grid-connected system under a weak power grid. Background technique [0002] Renewable energy generation is crucial to the sustainable development of human society and the environment. The increase in the proportion of renewable energy power generation, such as wind power generation and photovoltaic power generation in the power grid, has changed the characteristics of the power system dominated by synchronous motors, and its reliability needs to be re-examined. Therefore, the stability analysis and control of new energy power generation is an important issue. The focus of modern power system and energy conversion research. The use of permanent magnet direct-drive wind turbines for renewable energy power generation is an important application form in wind power generation. In addi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/10G01R27/02
CPCG06F17/10G01R27/02Y02E10/76
Inventor 李震田旭罗永志王艳辉戚为
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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