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近些年来,阶梯波调制方法在高电压、大容量多电平逆变器中得到了广泛的应用。本文首先介绍了一种在线计算触发角的方法,它只需要进行几个三角函数的计算就可以求出触发角,计算简单快速。然后将其在5H桥级联逆变器中得到了实现,并提出了逆变器H桥触发角的循环控制策略。同步静止补偿器(SSSC)是灵活交流输电控制器的一种,它可以调节系统阻抗,控制系统潮流和提高系统稳定性,具有良好的性能。文中把前面得到的逆变器模型应用到了SSSC中,并提出了相应的SSSC控制策略。最后在EMTDC/PSCAD中对提出的SSSC仿真模型进行了仿真验证。仿真结果表明,无论运行在感性模式还是容性模式,文中提出的SSSC模型都是合理的。
In recent years, the staircase wave modulation method has been widely used in high voltage, high-capacity multi-level inverters. This paper first introduces a method to calculate the trigger angle online. It only needs to calculate a few trigonometric functions to calculate the trigger angle, and the calculation is simple and fast. Then it is realized in the 5H bridge cascade inverter and the cycle control strategy of inverter H bridge firing angle is proposed. Synchronous Static Compensator (SSSC) is a flexible AC power transmission controller, which can adjust the system impedance, control system power flow and improve system stability, with good performance. In this paper, the previously obtained inverter model is applied to the SSSC, and the corresponding SSSC control strategy is proposed. Finally, the proposed SSSC simulation model is validated in EMTDC / PSCAD. The simulation results show that the SSSC model proposed in this paper is reasonable whether it operates in inductive mode or capacitive mode.