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A control method for an inverter control system without a back electromotive force sensor

A back electromotive force and control system technology, applied in the direction of converting irreversible DC power input to AC power output, electrical components, output power conversion devices, etc., can solve problems such as system failure and increase system cost

Active Publication Date: 2019-05-17
LONGYAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

High-precision sensors increase the cost of the system; and sensor failure can lead to system failure

Method used

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  • A control method for an inverter control system without a back electromotive force sensor
  • A control method for an inverter control system without a back electromotive force sensor
  • A control method for an inverter control system without a back electromotive force sensor

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Embodiment Construction

[0026] The present invention utilizes a single-phase bridge inverter, a current sensor, a driver, an observer, and electric wires and signal lines to construct an inverter control system without a back electromotive force sensor, uses a current sensor to obtain output current information, and inputs the obtained current information The Lebesgue observer reconstructs the voltage value of the back electromotive force from the observed back electromotive force signal and the current signal measured by the current sensor, and applies the voltage value to the current model predictive control algorithm of the controller to generate a control signal, The actual output current of the inverter can accurately and quickly track the expected current, and realize the accurate tracking of the inverter current when the inverter has no back electromotive force sensor.

[0027] The present invention is an inverter control system without back electromotive force sensor, such as figure 1 As show...

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Abstract

The invention relates to an inverter control system without a back electromotive force sensor and a control method thereof, using a single-phase bridge inverter, a current sensor, a driver, an observer, electric wires and signal lines to construct an inverter without a back electromotive force sensor In the inverter control system, the back electromotive force signal is used as an unknown periodic function to construct a time-varying state-space model of the inverter, and a time-varying Lebesgue observer is designed based on the time-varying state-space model, and the output current is obtained by combining the current sensor Information, reconstruct the back electromotive force, and introduce the reconstructed back electromotive force into the current model predictive control algorithm of the inverter controller, so as to realize the accurate tracking of the output current signal of the inverter when there is no back electromotive force sensor.

Description

technical field [0001] The invention relates to a control method of an inverter control system without a reverse electromotive force sensor. Background technique [0002] The inverter realizes energy conversion from DC to AC by controlling the output current of the AC terminal. It is the core device for photovoltaic grid-connected and AC motor control. The current control method of the inverter is the premise to ensure the normal operation of the inverter. Traditional control methods require sensors to measure the current and back EMF at the output. Depending on the application, the reverse electromotive force can be the grid voltage or the induced electromotive force of the AC motor. High-precision sensors increase the cost of the system; and sensor failure can lead to system failure. Therefore, a controller with fewer sensors makes sense. Contents of the invention [0003] The object of the present invention is to propose an inverter control system without a back ele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48
CPCH02M7/48H02M1/0012
Inventor 范宜标傅智河黄晓龙
Owner LONGYAN UNIV