Abstract In the industrial field, for various fans and pumps with a small range of speed regulation, the flow and pressure can be adjusted by a brushless double-fed motor (BDFM) speed regulation system equipped with a small capacity inverter, which can significantly reduce the energy loss caused by the traditional transmission system using dampers or valves. With high reliability and low maintenance cost, BDFMs are applicable for oil recovery, petrochemical, and power plant applications with harsh environments, maintenance difficulties, and explosion-proof requirements. As an existing fact, the starting control strategy and required equipment of the BDFM systems are complicated or require specific motor structures to achieve. Therefore, this paper proposes a speed control system topology with an improved energy absorption circuit, as shown in Fig.A1, and two related control methods are proposed. Firstly, the asynchronous starting torque characteristics of the BDFM are analyzed based on the synchronous-asynchronous series equivalent circuit model. Secondly, as shown in Fig.A1, the BDFM speed control system topology with an improved energy absorption circuit is designed. The operating state of the new topology is controlled by switching the contactor. There are two kinds of switch in the system above: the asynchronous start state (shown as the blue dashed line in Fig.A1) and the regular state (shown as the solid purple line in Fig.A1). Asynchronous starting is achieved by controlling the duty rate of the IGBT in the improved energy absorption circuit. Then, the equivalent series resistance expression for the new topology is derived. Accordingly, the control methods with fixedtime-duty ratio and fixedspeed-duty ratio are designed to realize the asynchronous starting control of the BDFM. For asynchronous starting without speed feedback, fixed-time fixed-duty ratio control is proposed, and the duty ratio of the IGBT in the energy absorption circuit increases linearly from 0% to 100% within a fixed time. For asynchronous starting with speed feedback, fixed-speed fixed-duty ratio control is proposed, in which the duty ratio is determined at a fixed speed point according to the demand for motor output torque. Finally, both simulation and experimental results prove the feasibility of the control method. These two control methods simplify the developing process of the asynchronous starting. The fixed-speed fixed-duty ratio control is an ideal asynchronous starting control method for BDFM, which can reduce the stator winding starting current while ensuring that the motor can start with constant torque, thus shortening the starting time. The fixed-time fixed-duty ratio control also has great practical value because it does not require motor speed detection. It is suitable for industrial applications where the speed signal cannot be measured, such as severe electromagnetic interference. In addition, it can be combined with the BDFM sensorless control algorithm to complete the system starting without the speed sensor.
Zhao Tantan,Yu Kexun,Liang Jiahao等. Asynchronous Starting Control Method of Brushless Doubly-Fed Motor Based on Improved Energy Absorption Circuit[J]. Transactions of China Electrotechnical Society, 2023, 38(24): 6646-6657.
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2023, Vol. 38 
