Abstract：The voltage reduction characteristics of single-phase current-source PWM converters as rectifiers and the voltage boost characteristics as inverters can meet the current application requirements of single-phase AC-DC converters. Traditional single-phase current-source PWM converters require a large inductor connected in series on the DC side to filter out the naturally occurring second harmonic ripple power, leading to high cost and large volume. The causes and suppression strategies of the second harmonic ripple power on the DC side of single-phase current-source PWM converters are analyzed in this paper. Then, a symmetrical half-bridge power decoupling topology is proposed, and a single-phase current-source PWM rectifier is introduced. The proposed decoupling topology can compensate for the second harmonic ripple power while reducing inductance values, costs, and volume. The proposed decoupling topology consists of two inverse-blocking IGBTs with series-connected diodes, one capacitor (Cpd), and two inductors (L1 and L2). The decoupling topology compensates for the second harmonic ripple power by charging and discharging inductors L1 and L2 with capacitor Cpd. When one inductor is being charged, the other inductor must be discharged. From the power absorption and release perspective, when the decoupling topology operates in region ①, inductor L1 is charging while inductor L2 is discharging. Because L1 absorbs more energy than L2 releases, the decoupling topology absorbs ripple power from the DC side. In region ②, L1 is discharging while L2 is charging. Because L1 releases more energy than L2 absorbs, the decoupling topology releases ripple power from the DC side. This working mode reduces current ripple and inductance values. Regions ③ and ④ follow a similar logic. The parameter designs for the capacitor and inductors are provided. The capacitor Cpd is 47 μF, and inductors L1 and L2 are 10 mH. After that, the two inductors are coupled magnetically, reducing the number of circuit components. The effect of inductance value reduction is enhanced. Finally, a control method with indirect closed-loop control of output current on the DC side is presented, which directly samples the DC side current and improves the reliability of the system. Suppose all other parameters are equal, simulations and experiments of a traditional single-phase current-source PWM rectifier with a 75 mH inductor and a single-phase current-source rectifier based on a symmetrical half-bridge decoupling topology with two 10mH inductors are conducted. The proposed symmetrical half-bridge power decoupling topology effectively suppresses the second harmonic ripple of the DC-side current in single-phase current-source converters. The proposed topology significantly reduces the DC-side inductance value, increases efficiency, and reduces the system’s costs, weight, and volume. After magnetic integration, only one inductor component remains, and the value of each inductor is further reduced. The control method based on the indirect closed-loop power decoupling topology has a simple structure and is easy to implement. Compared to traditional decoupling circuit control methods, this method eliminates the need for additional sensors, complex regulators, and calculations, providing greater flexibility in practical applications.
王立乔, 臧朔, 李翀, 王皓玉. 一种基于对称半桥功率解耦拓扑的单相电流型变换器[J]. 电工技术学报, 2024, 39(24): 7764-7776.
Wang Liqiao, Zang Shuo, Li Chong, Wang Haoyu. A Single-Phase Current-Source Converter Based on the Symmetrical Half-Bridge Power Decoupling Topology. Transactions of China Electrotechnical Society, 2024, 39(24): 7764-7776.
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