Grid-voltage-sensor-free vector control method of synchronous PWM (Pulse Width Modulation) rectifier

A grid voltage, vector control technology, applied in electrical components, AC power input into DC power output, output power conversion devices and other directions, can solve the high cost and complexity, inaccurate initial angle observation, PWM rectifier can not start and other problems to achieve good performance and protect IGBT devices

Inactive Publication Date: 2011-08-31
JIANGSU UONONE NEW ENERGY +1
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Problems solved by technology

[0009] The purpose of the present invention is to provide a synchronous PWM rectifier vector control method without a grid voltage sensor, which not only solves the problems of high cost and complexity caused

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  • Grid-voltage-sensor-free vector control method of synchronous PWM (Pulse Width Modulation) rectifier
  • Grid-voltage-sensor-free vector control method of synchronous PWM (Pulse Width Modulation) rectifier
  • Grid-voltage-sensor-free vector control method of synchronous PWM (Pulse Width Modulation) rectifier

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Embodiment Construction

[0035] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0036] see figure 1 A vector control method for a synchronous PWM rectifier without a grid voltage sensor is shown, and the specific steps of the vector control method are:

[0037] 11. Estimate the initial phase angle of the grid voltage before the PWM rectifier starts;

[0038] 12. Using the initial phase angle of the grid voltage and the input three-phase current of the rectifier, the initial phase angle is transformed through synchronous coordinates to obtain the active current and reactive current input by the rectifier in the grid synchronous coordinate system; the active power is obtained through the DC bus voltage deviation proportional integral adjustment Current setting, through reactive power setting, get reactive current setting;

[0039] 13. Using active current deviation proportional integral and reactive curre...

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Abstract

The invention discloses a grid-voltage-sensor-free vector control method of a synchronous PWM (Pulse Width Modulation) rectifier. The method comprises the following steps: estimating an initial phase angle of grid voltage before a PWM rectifier starts; adopting synchronous coordinate transformation to obtain active current and reactive current under a grid synchronous coordinated system; giving active current through the deviation PI (Proportional Integral) regulation of direct current busbar voltage, and giving reactive current through giving reactive power; adopting active current deviationPI and reactive current deviation PI to obtain a phase angle of grid voltage and output voltage of the rectifier; and controlling switch components through the output voltage of the rectifier. According to the invention, the vector control method has good performance for a three-phase symmetrical/asymmetric grid without a neutral point. The rectifier can work stably under the unit power factor byestimating the initial phase angle of the grid voltage, and the reactive power can be adjusted freely, thus the same control performance when a grid voltage sensor is used is achieved.

Description

technical field [0001] The invention relates to a vector control technology of a synchronous PWM rectifier without a grid voltage sensor, in particular to a vector control method of a synchronous PWM rectifier without a grid voltage sensor. Background technique [0002] With the extensive application of power electronic devices, especially rectification equipment, the rectification equipment will inject a large amount of harmonic and reactive current into the grid, causing serious pollution to the grid. At the same time, regenerative energy cannot be fed back to the grid, resulting in a significant waste of resources. The PWM rectifier has the characteristics of good sinusoidal input current and bidirectional flow of energy, and has been widely used in wind power generation and reactive power compensation and other fields. At present, the voltage-type PWM rectifier is widely used, and the voltage-oriented vector control method is mainly used. At this time, it is necessary to...

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Application Information

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IPC IPC(8): H02M7/219
Inventor 柴继涛周细文吴恒荣周金博章辉
Owner JIANGSU UONONE NEW ENERGY
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