阅读说明：本技术 一种双绕组永磁同步电机拖动控制方法 (Double-winding permanent magnet synchronous motor dragging control method ) 是由 刘志博 赵家欣 周玲玲 于 2020-12-31 设计创作，主要内容包括：本发明提供了一种双绕组永磁同步电机拖动控制方法,涉及电机控制的技术领域,包括：取给定转速并计算在给定转速下的频率,获取电压以及频率之比,启动第一变流器以使双绕组永磁同步电机启动；当电机转动到达转速阈值后,启动第二变流器对双绕组永磁同步电机转矩进行控制。通过本发明提供的方法可以缓解现有技术中用于控制电机的两台变流器功率分配不均,严重时会造成变流器过流停机的技术问题。(The invention provides a double-winding permanent magnet synchronous motor dragging control method, which relates to the technical field of motor control and comprises the following steps: taking a given rotating speed, calculating the frequency at the given rotating speed, obtaining the ratio of voltage to frequency, and starting a first converter to start the double-winding permanent magnet synchronous motor; and when the motor rotates to reach the rotating speed threshold, starting the second converter to control the torque of the double-winding permanent magnet synchronous motor. The method provided by the invention can solve the technical problem that the two converters for controlling the motor in the prior art have uneven power distribution and can cause overcurrent shutdown of the converters in serious cases.)

1. A double-winding permanent magnet synchronous motor drive control method is characterized by comprising the following steps:

acquiring a given rotating speed, calculating the frequency at the given rotating speed, acquiring the ratio of voltage to frequency, and starting a first converter to start the double-winding permanent magnet synchronous motor;

and when the motor rotates to reach a rotating speed threshold, starting the second converter to control the torque of the double-winding permanent magnet synchronous motor.

2. The method of claim 1, wherein said steps of obtaining a given speed and calculating a frequency at the given speed, obtaining a voltage to frequency ratio, and starting the first inverter to start the dual winding permanent magnet synchronous machine comprise:

and acquiring a given rotating speed, calculating the output frequency and voltage of the first converter at the given rotating speed, and acquiring the output frequency and voltage of the first converter through SVPWM control.

3. The method of claim 1, wherein said step of activating said second converter to control torque of said dual-winding PMSM after said motor rotation reaches a speed threshold comprises:

and obtaining three-phase current and three-phase voltage to perform torque calculation, comparing the three-phase current and the three-phase voltage with a given torque, performing PI (proportional integral) error setting on the three-phase current and the given torque based on the torque calculation, obtaining three-phase voltage of a motor winding, performing error comparison on the three-phase voltage after amplitude calculation, and performing PI setting to obtain output current and output voltage of a second converter.

Technical Field

The invention relates to the technical field of motor control, in particular to a double-winding permanent magnet synchronous motor dragging control method.

Background

The permanent magnet synchronous motor has the advantages of wide speed regulation range, high efficiency, high power density and the like, and is widely applied to the fields of position control, driving traction, high-efficiency power output and the like. The three-phase permanent magnet synchronous motor is the mainstream of the existing alternating current transmission, is widely applied to various fields such as industrial and agricultural production, and the low-voltage high-power output, high-reliability operation and high-performance torque output capability of the multi-phase motor are very suitable for occasions such as electric automobiles, ship propulsion, aerospace and the like. At present, researches on a multi-phase motor speed regulating system mainly focus on a multi-phase induction motor, and the multi-phase permanent magnet synchronous motor is only related in recent years, but the control method of the multi-phase induction motor can be popularized to the multi-phase permanent magnet synchronous motor.

With the increase of the capacity and the increase of the current of a single machine of the permanent magnet synchronous motor, the motor mostly adopts a double-winding three-phase structure form, two sets of windings are completely the same without phase shift, but the neutral points of the two sets of windings are not electrically connected. The stator has six outlet terminals but is still a three-phase motor. The external wiring mode of the double-winding three-phase permanent magnet synchronous motor is that two windings are respectively connected with the side of a converter, and the converter controls the power balance of the two windings. Generally, two windings of the motor are regarded as independent windings, two current transformers are adopted for independent control during control, and no communication is carried out between the two current transformers, so that the control of the motor is difficult. Because two windings adopt independent controllers, a unified rotating speed controller cannot be adopted, power distribution of two converters is uneven, and overcurrent shutdown of the converters can be caused in severe cases.

Disclosure of Invention

In view of the above, the present invention provides a method for controlling a double-winding permanent magnet synchronous motor to alleviate the technical problem that in the prior art, power distribution of two converters for controlling a motor is uneven, and overcurrent shutdown of the converters is caused in a severe case.

The invention provides a double-winding permanent magnet synchronous motor dragging control method, which comprises the following steps:

acquiring a given rotating speed, calculating the frequency at the given rotating speed, acquiring the ratio of voltage to frequency, and starting a first converter to start the double-winding permanent magnet synchronous motor;

and when the motor rotates to reach a rotating speed threshold, starting the second converter to control the torque of the double-winding permanent magnet synchronous motor.

Preferably, the steps of acquiring a given rotating speed, calculating a frequency at the given rotating speed, acquiring a voltage and a frequency ratio, and starting the first converter to start the double-winding permanent magnet synchronous motor comprise:

acquiring a given rotating speed, calculating the output frequency and voltage of the first converter at the given rotating speed, and acquiring the output frequency and voltage of the first converter through SVPWM control

Preferably, after the motor rotates to reach the rotational speed threshold, the step of starting the second converter to control the torque of the dual-winding permanent magnet synchronous motor includes:

and obtaining three-phase current and three-phase voltage to perform torque calculation, comparing the three-phase current and the three-phase voltage with a given torque, performing PI (proportional integral) error setting on the three-phase current and the given torque based on the torque calculation, obtaining three-phase voltage of a motor winding, performing error comparison on the three-phase voltage after amplitude calculation, and performing PI setting to obtain output current and output voltage of a second converter.

The embodiment of the invention has the following beneficial effects: the invention provides a double-winding permanent magnet synchronous motor dragging control method, which comprises the following steps: taking a given rotating speed, calculating the frequency at the given rotating speed, obtaining the ratio of voltage to frequency, and starting a first converter to start the double-winding permanent magnet synchronous motor; and when the motor rotates to reach the rotating speed threshold, starting the second converter to control the torque of the double-winding permanent magnet synchronous motor. The method provided by the invention can solve the technical problem that the two converters for controlling the motor in the prior art have uneven power distribution and can cause overcurrent shutdown of the converters in serious cases.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a system control block diagram of a double-winding permanent magnet synchronous motor drive control method according to an embodiment of the present invention.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

At present, because two windings adopt independent controllers and cannot adopt a unified rotating speed controller, power distribution of two converters is uneven, and overcurrent shutdown of the converters can be caused in serious cases.

For the convenience of understanding the embodiment, a detailed description is first given to a method for controlling the dragging of the dual-winding permanent magnet synchronous motor disclosed in the embodiment of the present invention.

The first embodiment is as follows:

the embodiment of the invention provides a double-winding permanent magnet synchronous motor drive control method, which comprises the following steps:

acquiring a given rotating speed, calculating the frequency at the given rotating speed, acquiring the ratio of voltage to frequency, and starting a first converter to start the double-winding permanent magnet synchronous motor;

and when the motor rotates to reach a rotating speed threshold, starting the second converter to control the torque of the double-winding permanent magnet synchronous motor.

Preferably, the steps of acquiring a given rotating speed, calculating a frequency at the given rotating speed, acquiring a voltage and a frequency ratio, and starting the first converter to start the double-winding permanent magnet synchronous motor comprise:

acquiring a given rotating speed, calculating the output frequency and voltage of the first converter at the given rotating speed, and acquiring the output frequency and voltage of the first converter through SVPWM control;

preferably, after the motor rotates to reach the rotational speed threshold, the step of starting the second converter to control the torque of the dual-winding permanent magnet synchronous motor includes:

and obtaining three-phase current and three-phase voltage to perform torque calculation, comparing the three-phase current and the three-phase voltage with a given torque, performing PI (proportional integral) error setting on the three-phase current and the given torque based on the torque calculation, obtaining three-phase voltage of a motor winding, performing error comparison on the three-phase voltage after amplitude calculation, and performing PI setting to obtain output current and output voltage of a second converter.

Furthermore, a converter connected with a motor winding I adopts rotation speed control, in order to realize the control of the motor without a position sensor, V/F control is adopted, the rotation speed of the motor is replaced by an open-loop position angle generator, and a V/F voltage-frequency ratio is adopted to control the starting of the motor and increase the rotation speed of the motor to a certain rotation speed. The V/F control mode ensures that the output voltage is in a certain proportion to the operating frequency, namely V/F is constant in most rotating speed ranges. The V/F control is to obtain ideal torque-speed characteristic, and to change the power frequency to regulate speed and ensure the magnetic flux of the motor to be constant.

And when the motor is started and reaches a certain rotating speed, starting a converter connected with the second winding, wherein the converter adopts torque control and realizes the motor control through a given torque instruction. And when the motor needs to be loaded, the power balance between the two windings is carried out by adjusting the torque instruction of the converter connected with the second winding.

Unless specifically stated otherwise, the relative steps, numerical expressions, and values of the components and steps set forth in these embodiments do not limit the scope of the present invention.

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the system and the apparatus described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.