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Improved EMPT algorithm applicable to average model of PWM current transformer

A current converter and averaging technology, which is applied in the direction of instruments, calculations, and special data processing applications, etc., can solve problems such as complex average model derivation process, limited application occasions, and inability to obtain correct system dynamics

Active Publication Date: 2013-07-31
TSINGHUA UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Among them, the ideal average model is the simplest, but in some occasions the correct system dynamics cannot be obtained; the derivation process of the average model considering the switching frequency is very complicated and has strict restrictions on the application occasions, so it is difficult to popularize; the more common one is the PWM converter The segmented average model is suitable for PWM converters with different topologies, laying a theoretical foundation for fast EMT simulation based on the average model

Method used

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  • Improved EMPT algorithm applicable to average model of PWM current transformer
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  • Improved EMPT algorithm applicable to average model of PWM current transformer

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Embodiment

[0079] The flow chart of the improved EMTP algorithm applicable to the average model of PWM converter is shown in figure 1 , the processes of the two sub-modules (the sub-module of segmented average model parameter prediction and update and the sub-module of segmented average model error correction) are respectively shown in figure 2 and image 3 .

[0080] The algorithm of the present invention is illustrated by taking a three-phase PWM AC-DC converter adopting feedback control as an example. The structure of the converter and its feedback control system can be found in Figure 4 and Figure 5 .

[0081] The relevant parameters of the simulation platform are:

[0082] Table 1 Simulation platform parameters

[0083]

[0084] The EMTP simulation is carried out based on the test examples and simulation platform described above, and the specific implementation steps are as follows:

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Abstract

The invention discloses an improved EMPT (electromagnetic pulse technology) algorithm applicable to the average model of a PWM (Pulse-Width Modulation) current transformer. According to the algorithm provided by the invention, a complex switch processing submodule in a traditional EMPT algorithm is omitted, and meanwhile 2 submodules are added for respectively predicting parameters of a subsection average model and rectifying simulation errors caused by inaccurate parameter. According to the invention, simulation is performed by flexibly using segmental average of the PWM current transformer; and while greater integration step simulation is adopted, the correctness of simulation results can also be ensured, so that the improved EMPT algorithm is more convenient to be applied to an actual power system.

Description

technical field [0001] The invention relates to the technical field of electric power system electromagnetic transient simulation, in particular to an improved EMTP algorithm applicable to the average model of a PWM converter. Background technique [0002] The interconnection of regional power grids in our country is constantly being strengthened. In order to maintain the safe and efficient operation of the interconnected large system, it is necessary to conduct integrated simulation analysis of the entire network. [0003] When performing transient simulation on distributed generation systems and microgrids, it is necessary to use electromagnetic transient simulation (EMT simulation) technology. The most widely used electromagnetic transient simulation method is the EMTP method proposed by Dommel. [0004] In EMTP, the PWM converter is usually described by a detailed model, that is, each power electronic switch constituting the PWM converter is modeled separately and conne...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 黄秀琼许寅陈颖陈来军白先红陈卫东
Owner TSINGHUA UNIV