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Static frequency converter load commutation start numerical simulation method in consideration of commutation overlapping angle change

A static frequency converter, numerical simulation technology, applied in the direction of model/simulation for control purposes, can solve the problem of not considering the change of the commutation overlap angle μ, and achieve the effect of eliminating contradictions and improving simulation accuracy

Active Publication Date: 2019-02-22
STATE GRID HUNAN ELECTRIC POWER +2
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  • Abstract
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  • Application Information

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Problems solved by technology

[0014] Literature [2-4] follows the digital simulation model of literature [1], so the change of commutation overlap angle μ is also not considered, and μ is assumed to be constant during the speed change process, so there is a contradiction

Method used

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  • Static frequency converter load commutation start numerical simulation method in consideration of commutation overlapping angle change
  • Static frequency converter load commutation start numerical simulation method in consideration of commutation overlapping angle change
  • Static frequency converter load commutation start numerical simulation method in consideration of commutation overlapping angle change

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Embodiment

[0090] A synchronous motor started with static frequency converter (SFC) is constructed, and it runs in the stage of load commutation. The basic parameters and state parameters of the motor are shown in Table 1 and Table 2.

[0091] Table 1 Motor characteristic parameters

[0092]

[0093] Table 2 Motor initial state parameters

[0094]

[0095] The simulation is carried out considering the transformation of the commutation overlap angle μ and without considering the change of the commutation overlap angle μ. For the specific process of numerical calculation, see figure 2 shown. image 3 The display result is μ=5° when the initial value is appropriate, and the simulation curve when the commutation overlap angle μ changes is considered; Figure 4 The displayed result is μ=10° when the initial value is not suitable. Considering the simulation curve when the commutation overlap angle μ changes, it can be seen that the Te curve has an adaptive process for the unsuitable μ...

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Abstract

The invention discloses a static frequency converter load commutation start numerical simulation method in consideration of a commutation overlapping angle change, comprising the following steps: 1, supposing that an SFC operates in a constant DC mode, simplifying a function relationship of the stator current to the time; 2, supposing that the harmonic components of the stator are ignored during the operation of the SFC and only the influence of the fundamental component is taken into account, obtaining differential equations of the rotor current, the damper winding current and the rotationalspeed by using a Park equation; 3, calculating the differential equations by using a fourth-order Runge-Kutta method; 4, compensating a voltage drop caused by stator current commutation for the machine terminal voltage waveform, and obtaining a relatively smooth machine terminal voltage; and 5, approximately considering that a sine wave exists between every two zero crossing points, using the maximum value of the absolute value of the smooth terminal voltage sine wave as a peak between the two zero crossing points for the calculation of a next commutation overlapping angle [mu]. The method eliminates the contradiction in a simulation process and improves the simulation precision to meet the needs of theoretical analysis and field accident location.

Description

technical field [0001] The invention belongs to the technical field of static frequency converter load commutation numerical simulation technology, and particularly relates to a static frequency converter load commutation start numerical simulation method which takes into account the change of the commutation overlap angle. Background technique [0002] The static frequency converter (SFC) is widely used in the start-up process of pumped energy storage, phase modulation, etc. The main function of SFC is to drive the rotor to rotate by changing the magnetic field formed by the stator current, and change the magnetic field formed by the stator current according to the rotor speed. . The process of SFC starting the rotating electrical machine is divided into forced commutation stage and load natural commutation stage. The natural commutation of the load occurs at a certain speed, and the terminal voltage of the machine can form a sufficient commutation voltage, and the commuta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/34
CPCH02P6/34
Inventor 李理周卫华郭思源洪权蔡昱华熊尚峰李大公吴晋波
Owner STATE GRID HUNAN ELECTRIC POWER
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