A bidirectional three-phase dc–ac converter with embedded dc–dc converter for bidirectional storage interface is proposed in this paper. With the help of the embedded dc–dc converter, the voltage of the storage battery can vary in a wide range. To minimize the power rating and power losses of the embedded dc–dc converter, a simple carrier-based pulsewidth modulation (PWM) strategy with zero-sequence injection is proposed. By adopting the proposed PWM strategy, only a small ratio of total power needs to be processed by the embedded dc–dc converter, while most of the power is only processed by the three-phase dc–ac stage within a single conversion stage. As a result, quasi single-stage power conversion is achieved to improve the conversion efficiency of the overall dc–ac power system. Principles, characteristics, and implementations of the proposed three-phase dc–ac converter and its PWM strategy are analyzed in detail. The feasibility and effectiveness of the proposed solutions are verified with experimental results.

中文翻译：

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具有嵌入式 DC-DC 转换器和基于载波的 PWM 策略的双向三相 DC-AC 转换器，适用于宽电压范围应用

本文提出了一种双向三相 dc-ac 转换器，带有用于双向存储接口的嵌入式 dc-dc 转换器。在嵌入式dc-dc转换器的帮助下，蓄电池的电压可以在很宽的范围内变化。为了最小化嵌入式 DC-DC 转换器的额定功率和功率损耗，提出了一种具有零序注入的简单的基于载波的脉宽调制 (PWM) 策略。通过采用所提出的 PWM 策略，嵌入式 dc-dc 转换器只需处理总功率的一小部分，而大部分功率仅由单个转换级中的三相 dc-ac 级处理。从而实现了准单级电源转换，提高了整个dc-ac电源系统的转换效率。原理、特点、并详细分析了所提出的三相 DC-AC 转换器及其 PWM 策略的实现。实验结果验证了所提出解决方案的可行性和有效性。