基于扰动观测器的五相永磁同步电机开路和短路容错矢量控制

doi:10.19595/j.cnki.1000-6753.tces.230988

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Abstract The unbalanced phase currents of a multiphase permanent magnet synchronous motor (PMSM) generate large torque fluctuations when an open-circuit or short-circuit fault occurs, which causes the whole system to oscillate or even not continue operating. A novel field-oriented control strategy based on disturbance- observer (DOB-FOC) is proposed to restrain torque fluctuations in the five-phase PMSM with third harmonic back electromotive forces (EMF) under open-circuit and short-circuit fault conditions.
Firstly, a fundamental PMSM model with open-circuit fault is built in the synchronous rotating frame using an orthogonal reduced-order transformation matrix. The third harmonic back EMF and short-circuit current are recognized as disturbances. Secondly, a disturbance observer is designed. Then, a feedforward compensatory current obtained from the estimated disturbances is added to the q-axis current reference. Finally, the torque fluctuations caused by the fault can be restrained effectively, and the PMSM with the proposed strategy can operate well under open-circuit and short-circuit faults.
Simulation shows that when the third harmonic back EMF is 0 or 20% of the fundamental amplitude, DOB-FOC can effectively suppress the fluctuating torque caused by open-circuit and short-circuit faults. Therefore, whether the back EMF contains the third harmonics, the faulty motor with DOB-FOC has a similar steady-state performance in healthy conditions. Experimental results demonstrate the feasibility and effectiveness of the proposed strategy. When the open-circuit or short-circuit fault occurs, the proposed DOB-FOC strategy is activated at once, and the fluctuating torque is restrained to 0.14 N·m and 0.19 N·m, respectively. When the load steps between 3 N·m and 5 N·m, the d-axis current almost remains unchanged, the q-axis current is like that under healthy conditions, and the response time is 170 ms. During the reference speed step changes, the DOB-FOC strategy significantly reduces the fault impact on the speed performance. Its dynamic performance is similar to that under healthy conditions, and its response time is 240 ms.
The following conclusions can be drawn from the theoretical analysis, simulation, and experimental results. (1) The proposed strategy can effectively suppress the fluctuating torque caused by the third harmonic back EMF under open-circuit or short-circuit faults. (2) DOB can effectively estimate torque fluctuations caused by short-circuit current and observe the disturbance caused by two-phase faults without additional hardware support. (3) The proposed strategy is suitable for PMSM with only fundamental back EMF or third harmonic back EMF.

Key words： Permanent magnet synchronous motor (PMSM) field-oriented control (FOC) open-circuit fault short-circuit fault disturbance observer

Received: 26 June 2023

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	Zhou Huawei
	Chen Cheng
	Xiang Xiaolong
	Zhang Duo
	Chen Qian

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Zhou Huawei,Chen Cheng,Xiang Xiaolong等. Disturbance-Observer-Based Field-Oriented Control of Five-Phase PMSM under Open-Circuit and Short-Circuit Faults[J]. Transactions of China Electrotechnical Society, 2024, 39(15): 4782-4793.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.230988 OR https://dgjsxb.ces-transaction.com/EN/Y2024/V39/I15/4782

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