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- Title
超高速低载频比下永磁同步电机无差拍电流控制.
- Authors
王晓琳; 李紫佳; 李正龙; 严廷雄
- Abstract
The ultra-high-speed motor drive system based on digital control has the characteristics of wide operating speed range and low-carrier frequency ratio. Using traditional deadbeat control can no longer ensure the control performance and stability of its current loop in the high speed region. In order to solve the above problems, the influence of the equivalent delay term on the stability of the deadbeat control system at low-carrier frequency ratio was analyzed by constructing a complex vector equivalent model of the current loop of an ultra-high-speed motor in the Z domain. The analytical expressions of approximate discrete model error and parameter mismatch error for deadbeat control were derived and analyzed quantitatively. An improved method for low-carrier frequency operation of ultra-high-speed motors was proposed. A voltage feedforward compensation scheme based on discrete sliding mode observers was adopted to enhance the robustness of the system against model errors and parameter disturbances. The observer control function and disturbance were introduced into the current prediction model, and the additional term of time delay was corrected and compensated, which effectively eliminates the comprehensive impact of system delay. Finally, the proposed theory and method were verified by simulation and experiments.
- Subjects
DIGITAL control systems; BIVECTORS; SLIDING mode control; PROBLEM solving; PREDICTION models; TIME delay systems; SPEED; MOTOR drives (Electric motors)
- Publication
Electric Machines & Control / Dianji Yu Kongzhi Xuebao, 2023, Vol 27, Issue 4, p55
- ISSN
1007-449X
- Publication type
Article
- DOI
10.15938/j.emc.2023.04.006