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首页> 外文期刊>Industrial Electronics, IEEE Transactions on >An Improved CPS-PWM Scheme-Based Voltage Balancing Strategy for MMC With Fundamental Frequency Sorting Algorithm
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An Improved CPS-PWM Scheme-Based Voltage Balancing Strategy for MMC With Fundamental Frequency Sorting Algorithm

机译：基于基本频率排序算法的基于CPS-PWM方案的MMC电压平衡策略的改进

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摘要

In this paper, a new voltage balancing strategy based on improved carrier-phase-shifted pulsewidth modulation (CPS-PWM) scheme and fundamental frequency sorting algorithm (FFSA) is proposed. FFSA is a salient method which sorts the capacitor voltages at fundamental frequency and utilizes the different charging ability of driving signals to converge the capacitor voltages. Unfortunately, under the CPS-PWM scheme with high carrier frequency, 250 Hz or higher, FFSA cannot bring the capacitor voltage to the nominal value once the unbalance occurs, because there is a little difference remaining in the driving signal's charging ability. To avoid this disadvantage, an improved CPS-PWM scheme is proposed. In this scheme, driving signals with proper phase angle differences are selected to be dealt with logic and/or processing according to the sorting result of FFSA. With the logic processing, new driving signals with obviously different charging abilities are synthesized, which are assigned to the corresponding unbalanced submodules to achieve the balance of capacitor voltages. And several regions for logic processing are set up, where the proper phase angle difference is selected for each region in order to both guarantee the convergence speed and avoid the voltage oscillations. With the proposed scheme, FFSA can be adopted under CPS-PWM with high carrier frequency. Moreover, the merits of FFSA are inherited, such as the reduced computational burden and the elimination of arm current detection. Performance and effectiveness of the proposed strategy are validated by both simulations and experimental results.
机译：本文提出了一种基于改进的载波相移脉宽调制（CPS-PWM）方案和基频排序算法（FFSA）的电压平衡策略。 FFSA是一种显着的方法，它以基频对电容器电压进行排序，并利用驱动信号的不同充电能力来收敛电容器电压。不幸的是，在具有高载波频率（250 Hz或更高）的CPS-PWM方案下，一旦发生不平衡，FFSA无法将电容器电压恢复到标称值，因为驱动信号的充电能力仍然存在少许差异。为了避免这个缺点，提出了一种改进的CPS-PWM方案。在该方案中，根据FFSA的分类结果，选择具有适当相角差的驱动信号以进行逻辑和/或处理。通过逻辑处理，可以合成具有明显不同充电能力的新驱动信号，并将其分配给相应的不平衡子模块，以实现电容器电压的平衡。并且设置了几个用于逻辑处理的区域，其中为每个区域选择适当的相角差，以确保收敛速度并避免电压振荡。通过提出的方案，可以在高载波频率的CPS-PWM下采用FFSA。此外，FFSA的优点也得到了继承，例如减轻了计算负担并消除了臂电流检测。仿真和实验结果均验证了所提策略的性能和有效性。

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