阅读说明：本技术 一种多相带悬浮电容电机驱动拓扑的控制方法 (Control method of multiphase belt suspension capacitor motor drive topology ) 是由 刘自程 孙翔文 李安 蒋栋 曲荣海 于 2019-10-14 设计创作，主要内容包括：本发明公开了一种多相带悬浮电容电机驱动拓扑的控制方法,包括：对电源侧主逆变器进行转子磁链定向的矢量控制,驱动多相开绕组电机运行；基于预设调制比范围和悬浮电容电压实时值,独立控制悬浮电容侧辅逆变器通过多相电机绕组获取主逆变器输出的部分有功功率,同时独立控制辅逆变器补偿输出无功功率；使得主逆变器仅输出有功功率且实现根据实际运行工况而悬浮电容电压变化可控。本发明结合电源侧特点与电容侧的两大控制核心(电容电压可控与无功功率补偿),采取主逆变器转矩磁链解耦和辅逆变器有功无功解耦的混合方式,保证电容侧辅逆变器的工作状态稳定并最大程度的发挥其无功补偿的优势,有效降低悬浮电容侧逆变器的开关损耗,提升系统效率。(The invention discloses a control method of a multiphase motor drive topology with a suspension capacitor, which comprises the following steps: carrying out vector control of rotor flux linkage orientation on a main inverter at the power supply side, and driving a multi-phase open winding motor to operate; based on a preset modulation ratio range and a voltage real-time value of the suspension capacitor, independently controlling the auxiliary inverter at the side of the suspension capacitor to obtain partial active power output by the main inverter through a multi-phase motor winding, and simultaneously independently controlling the auxiliary inverter to compensate and output reactive power; the main inverter only outputs active power and the voltage change of the suspension capacitor is controllable according to the actual operation condition. The invention combines the characteristics of the power supply side and two control cores (controllable capacitor voltage and reactive power compensation) of the capacitor side, adopts a mixed mode of torque flux linkage decoupling of the main inverter and active and reactive decoupling of the auxiliary inverter, ensures the stable working state of the auxiliary inverter of the capacitor side, exerts the advantage of reactive power compensation to the maximum extent, effectively reduces the switching loss of the inverter of the suspension capacitor side and improves the system efficiency.)

1. A control method of a multi-phase belt suspension capacitor motor drive topology is characterized by comprising the following steps:

s1, carrying out vector control of rotor flux linkage orientation on the main inverter at the power supply side, and driving the multi-phase open winding motor to operate;

s2, controlling the auxiliary inverter on the suspension capacitor side to obtain partial active power output by the main inverter through the multi-phase motor winding based on the preset modulation ratio range and the voltage real-time value of the suspension capacitor, and controlling the auxiliary inverter to compensate and output reactive power; through the independent control between the active power and the reactive power, the main inverter only outputs the active power, the voltage change of the suspension capacitor is controllable according to the actual operation condition, and the control of the multi-phase motor drive topology with the suspension capacitor is realized.

2. The method according to claim 1, wherein in S2, the control floating capacitor side auxiliary inverter obtains a part of active power output by the main inverter through the windings of the multi-phase motor, specifically:

when the current at the motor end is stable, the PI controller is used for controlling the decomposition amount of an output voltage vector output by the auxiliary inverter along the parallel direction of the current at the motor end, and controlling the auxiliary inverter to obtain the active power output by the main inverter through a multi-phase motor winding.

3. The method according to claim 2, wherein in step S2, the controlling the auxiliary inverter compensates for the output reactive power, specifically:

and detecting a power angle of the main inverter, and based on the power angle, if the main inverter is judged not to be in a unit power factor state, controlling the resolution of an output voltage vector output by the auxiliary inverter along the direction vertical to the current of the motor end through a PI controller, and controlling the auxiliary inverter to compensate and output reactive power until the main inverter only outputs active power and is in the unit power factor state.

4. The method according to claim 3, wherein when the main inverter is in the unity power factor state, the resolution of the output voltage vector output by the auxiliary inverter along the direction perpendicular to the motor-side current is:

5. The method according to claim 1, wherein in S2, the implementation that the voltage change of the floating capacitor is controllable according to the actual operating condition is specifically:

controlling the auxiliary inverter to output voltage based on the active power and the reactive power after independent control, and when the ratio of the output voltage to the capacitor voltage set value is smaller than the minimum value of the preset modulation ratio range, controlling the auxiliary inverter to reduce the acquisition of the active power output from the main inverter through the multi-phase motor winding so as to reduce the real-time value of the capacitor voltage; and when the ratio is larger than the maximum value of the preset modulation ratio range, controlling the auxiliary inverter to increase the acquisition of the active power output from the main inverter through the multi-phase motor winding so as to increase the real-time value of the capacitor voltage and complete the change control of the suspended capacitor voltage of the auxiliary inverter.

6. The method as claimed in claim 5, wherein the preset modulation ratio is in a range of 0.85-0.95.

7. The method as claimed in claim 5, wherein the step of the real-time variation of the capacitor voltage is determined by a preset capacitor voltage regulation rate.

8. The method for controlling the multi-phase belt suspended capacitor motor drive topology according to any one of claims 1 to 7, wherein the step S1 further comprises:

based on PI control, a synchronous coordinate system with the rotation speed being multiple times of the fundamental wave is adopted to carry out harmonic suppression on the current at the motor end.

9. A multi-phase belt suspended capacitor motor drive topology system, comprising: the system comprises a controller, a power supply side main inverter, a suspension capacitor side auxiliary inverter and a multi-phase motor, wherein the power supply side main inverter, the suspension capacitor side auxiliary inverter and the multi-phase motor are respectively connected with the controller;

wherein the power supply side main inverter, the floating capacitor side auxiliary inverter and each phase of the multi-phase motor are connected in sequence, and the controller is used for executing the control method of the multi-phase motor driving topology with the floating capacitor as claimed in any one of claims 1 to 8.

10. A storage medium having stored therein instructions which, when read by a computer, cause the computer to execute a method of controlling a multi-phase band floating capacitor motor drive topology according to any of claims 1-8.