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Three-phase inversion control system and control method

A three-phase inverter and control system technology, applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc., can solve the problems of poor stability, slow response speed, system instability, etc. Superior performance, fast adjustment speed effect

Pending Publication Date: 2021-11-05
SANTAK ELECTRONICS SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the existing inverter control system, due to the existence of nonlinear factors, the quality of the inverter output waveform will deteriorate and even lead to system instability
In the existing inverter control method, the feedback control is directly performed through current or voltage, and the response speed is slow and the stability is poor.

Method used

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  • Three-phase inversion control system and control method

Examples

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Effect test

no. 1 example

[0041] In this example, based on figure 1 The shown three-phase four-wire inverter topology provides the inverter control system and inverter control method of the present invention, and the control object of the control system and control method in this embodiment is figure 1 The three-phase four-wire inverter topology shown. For the sake of simplicity, only phase A is discussed as an example. Those skilled in the art can understand that the situation of phase B and phase C is similar to that of phase A. In this paper, both ABC and abc are used to represent the phase of the three-phase inverter. three phase.

[0042] see image 3 The simplified inverter control system shown. First, given V based on the effective value of the inverter voltage rms_ref Obtain the given value of inverter sinusoidal voltage v ref_sin and inverter cosine voltage given value v ref_cos ,

[0043]

[0044] Among them, w is the angular frequency of the inverter output voltage, and t is the time...

no. 2 example

[0087] In this example, provided for figure 2 The inverter control system of the three-phase three-wire inverter topology shown, see Figure 8 A simplified schematic diagram of a three-phase control system for a three-phase three-wire inverter is shown. Its image 3 On the basis of the control system shown, the coordinate system conversion part is added, where abc / αβγ represents the conversion part from the abc coordinate system to the αβγ coordinate system, and αβλ / abc represents the inverse conversion part from the αβγ coordinate system to the abc coordinate system. In the electrical field, the three-phase system has a three-phase abc static coordinate system, a three-phase αβγ static coordinate system, and a two-phase rotating coordinate system dqo. After the coordinate system transformation, the inverter voltage V of the controlled object is inverted. inv_α V inv_β It is still sine-cosine fundamental wave control, and its controller still uses the instantaneous value v...

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Abstract

The invention provides a three-phase inversion control system, which comprises an instantaneous value voltage controller and an equivalent effective value voltage controller. The instantaneous value voltage controller is used for performing feedback control on an instantaneous value of inversion output voltage, and the equivalent effective value voltage controller is used for performing orthogonal decomposition feedback control on an effective value of the inversion output voltage, the equivalent effective value voltage controller is used for performing integral compensation on the real-axis voltage and the imaginary-axis voltage of the two-phase rotating coordinate system of the three-phase inverter respectively; and the output of the instantaneous value voltage controller and the output of the equivalent effective value voltage controller are used for obtaining inversion output voltage through a delay link transfer function and a controlled object transfer function. The control system is high in adjusting speed and high in stability.

Description

technical field [0001] The invention belongs to the field of inverters, in particular to a three-phase inverter control system and control method. Background technique [0002] An inverter is a converter that converts direct current energy such as batteries and storage batteries into constant frequency and constant voltage or frequency modulation and voltage modulation alternating current. With the rapid development of science and technology, people's life and production have higher and higher requirements for power supply quality, and the inverter is the core part of power supply equipment such as uninterruptible power supply (UPS), variable frequency power supply, and new energy power supply system. Therefore, The research on inverter is of great significance to the development of modern industry. In the existing inverter control system, due to the existence of nonlinear factors, the quality of the output waveform of the inverter will deteriorate and even cause the system...

Claims

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Application Information

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IPC IPC(8): H02M7/5387H02M7/493
CPCH02M7/53871H02M7/53873H02M7/493
Inventor 宁华宏张登科李化良郑大为
Owner SANTAK ELECTRONICS SHENZHEN
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