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| Current Closed-Loop Control Strategy of Permanent Magnet Synchronous Motor Based on SHEPWM |
| Cai Zhanpeng1, Yang Shuying1, Wang Qishuai1, Wang Hui2 |
1. College of Electrical Engineering and Automation Hefei University of Technology Hefei 230009 China;
2. Sungrow Power Supply Co. Ltd Hefei 230088 China |
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Abstract Regarding high-speed electric drives, the ratio of the switching to the fundamental frequency is low due to the limited switching frequency allowed. As a result, the low-order harmonics of conventional asynchronous pulse width modulation are relatively large. Selective harmonic elimination pulse width modulation (SHEPWM) can effectively eliminate low-order harmonics. Still, the actual output voltage deviation is relatively large during the dynamic process, which affects the dynamic performance of the field-oriented control system. To suppress the influence of deviation voltage on the system, this paper proposes a SHEPWM current closed-loop control scheme based on duty cycle adaptive compensation.
Firstly, the current closed-loop implementation scheme of SHEPWM is introduced. This scheme achieves phase matching between field-oriented control and synchronous modulation by utilizing a phase-locked loop. Through the discretization modeling of the phase-locked loop, a theoretical basis is provided for parameter tuning. Subsequently, the influence of the control instructions of the SHEPWM algorithm and the actual output volt-second imbalance of the inverter on the control system is analyzed. This paper proposes a duty cycle compensation method based on current error and designs a dynamic weighting factor through a nonlinear error function for duty cycle compensation. This scheme eliminates the deviation voltage in the dynamic process, thereby improving dynamic performance. During the steady-state process, the deviation voltage is not compensated, thereby ensuring the steady-state harmonic performance of SHEPWM.
Experiments were conducted on the 18 kW IPMSM hardware platform. At the rated rotational speed, compared with the traditional F-SHE modulation scheme, the dynamic regulation time of D-SHE is shortened from 45ms to 22 ms, and the current overshoot during the dynamic process is significantly reduced. During the steady-state process, the duty cycle compensation amount of D-SHE is approximately 0, thus ensuring the harmonic elimination performance. The fifth and seventh harmonics of the stator current are reduced to 2.4% and 2.8% respectively, and the total harmonic distortion is like that of the P-SHE modulation strategy without duty cycle compensation.
The following conclusions can be drawn. (1) The complete SHE switching period is equivalent to being divided into 12 switch sequences. The current sampling points are fixed at the starting points of the ideal spatial vector, achieving phase synchronization and ensuring the stability of the switch sequence. (2) Optimizing the synchronous modulation strategy: Due to its fixed switching time, the actual output voltage deviation during the dynamic process affects the dynamic response performance of the control system. (3) The proposed strategy designs an adaptive dynamic weighting factor through a nonlinear error function. During the dynamic response process, the duty cycle deviation is adaptively compensated by correcting the switching time. However, when the system is in steady-state conditions, the duty cycle deviation of the switching Angle of SHEPWM is not corrected, thus not affecting the harmonic elimination characteristics in the steady-state conditions.
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Received: 04 September 2024
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2025, Vol. 40 
