大功率感应牵引电机的高动态响应无差拍控制技术研究

doi:10.19595/j.cnki.1000-6753.tces.241258

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Abstract In high-power motor drives, especially in high-power electric mining dump trucks, the switching frequency of the inverter is always strictly limited to avoid high switching losses, which will make the control system operate in a low pulse ratio condition. Therefore, the performance of traditional control strategies such as field-oriented control (FOC) and direct-torque control (DTC) will deteriorate. When a high-power electric mining truck is operated quickly, the DC bus voltage always has a dramatic variation, which may make the control system unstable since the response of rotor flux in traditional FOC is slow. This paper proposes a deadbeat control (DBC) strategy with high dynamic performance under a low pulse ratio to solve this problem. The proposed control strategy simultaneously achieves fast stator current & rotor flux dynamic responses and low current harmonics.
Firstly, the eigenvalue-based discrete model is derived. The mathematical model of the induction motor is modeled in the continuous domain using a state space description. The full-rank state matrix is diagonalized through the transformation matrix. The elements on the diagonal of the diagonal matrix are the corresponding stator's characteristic roots and the induction motor's rotor voltage equations. The exact solution of the system matrix can be obtained through the transformation matrix and the diagonal matrix. Thus, the eigenvalue-based discrete model of the induction motor is derived.
The deadbeat control system is designed in the discrete domain. The linear transformation is applied to the state variables, and a new state variable vector is defined. Then, the new state variable vector is transferred to the synchronized coordinate system. Since the violent oscillation of DC bus voltage in high-power electric mining dump trucks, the high dynamic performance of rotor flux and dq-axis current should be achieved simultaneously to keep the system stable. Therefore, the extra constraint of state variables is derived to control the rotor flux and stator current vector with three degrees of freedom.
Finally, the whole DBC system is introduced, and the simulation and high-power tests are performed. Simulation and experimental results show that the dq-axis current and rotor flux responses are deadbeat during the dynamic process. The torque response time reaches milliseconds, exhibiting an excellent dynamic torque performance. When the flux reference changes, the proposed system evaluates whether the flux tracking can be completed within one sampling period. If it cannot be completed, the system will control the flux by steps within several periods. However, the whole control process can also be maintained at tens of milliseconds, showing an excellent dynamic performance of rotor flux.

Key words： Deadbeat control induction machine low pulse ratio discretization model

Received: 15 July 2024

PACS:

TM301.2

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	Zhou Zheng
	Li Jian
	Lu Yang
	He Kun

Cite this article:

Zhou Zheng,Li Jian,Lu Yang等. Research on Deadbeat Control Technology with High Dynamic Performance for High-Power Induction Motors[J]. Transactions of China Electrotechnical Society, 2025, 40(16): 5283-5293.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.241258 OR https://dgjsxb.ces-transaction.com/EN/Y2025/V40/I16/5283

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