Power conversion system and method of controlling power conversion system
A technology of power conversion and control algorithm, which is applied in the direction of conversion equipment for intermediate conversion to direct current, electronic commutation motor control, control of generators, etc., and can solve problems such as increasing the driving current, not being very successful, and the motor cannot be started.
Active Publication Date: 2017-11-07
ROCKWELL AUTOMATION TECH
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Problems solved by technology
Also, saturation of the step-up transformer results in significantly increased drive current without delivering too much power to the motor load
Also, voltage-frequency control combined with a sine-wave filter during start-up conditions can cause the motor not to start, with large oscillations of the rotor shaft for low-frequency requirements
Also, traditional sensorless voltage-frequency drive controls are not very successful in driving permanent magnet motors when output filters and transformers are used
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[0012] Referring now to the drawings, several embodiments or implementations are described below in conjunction with the drawings, wherein like reference numerals are used to refer to like elements throughout, and wherein various features are not necessarily drawn to scale. The present disclosure provides methods and apparatus for driving a motor or other load through an output filter and optionally through an additional transformer, and can be found in submersible pump applications or do not require direct feedback from the driven load to an AC load powering other applications. For example, sensorless motor drive applications even for permanent magnet motor loads can be enhanced by using the disclosed apparatus and methods, and unregulated driver output current seen in conventional voltage frequency sensorless motor drive systems can be eliminated or avoided , transformer saturation, and problems associated with motor starting. Therefore, the benefits of sensorless control c...
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The present invention relates to a power conversion system and a method of controlling a power conversion system. A power converter (10), a control device (20) and a method (100) are presented for driving a permanent magnet motor or other load (6) through a sine wave filter (16) and transformer (18), wherein a current frequency The relationship (24) controls the inverter output current (IA, IB, IC) to convert the desired frequency or speed value (21,31) to the current set point (32), using a sine wave filter with ratio (16) A control algorithm (26) with a bandwidth of low resonant frequency to regulate the inverter output current (IA, IB, IC).
Description
technical field [0001] The present invention relates to a power conversion system and a method of controlling a power conversion system. Background technique [0002] Sensorless motor drives are used in a variety of applications, especially where it is difficult or impractical to provide position and / or speed sensors directly at the motor load. A typical sensorless system employs a voltage-frequency (V / F) (alternatively referred to as volts per hertz (V / Hz)) controller, which provides a voltage set point based on the desired motor speed or frequency. This form of sensorless Sensor control is mainly used in induction motors. In certain applications, however, a step-up transformer that boosts the output voltage of the motor drive is often required. For example, a transformer may enable the use of a low-voltage drive to power a medium-voltage induction motor, and / or a step-up transformer may be used to reduce the I 2 R loss and enables the use of shorter measuring cable wire...
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IPC IPC(8): H02M7/5387H02P21/00H02P27/08
CPCH02P27/06H02M1/126H02P21/0003H02M5/44H02P23/0077
Inventor 刘晶波托马斯·诺德哈尔彼得·舒米特谢苗·罗亚克
Owner ROCKWELL AUTOMATION TECH