The unified power quality conditioner (UPQC) integrated with the battery energy storage system not only mitigates the power quality problems on the grid side and load side but also supplies active power to the load or the grid. The wide voltage variation of the battery and the high efficiency of the whole system can be achieved with the hybrid connected configuration, i.e., the battery is connected simultaneously to the series and shunt converters of the UPQC directly and indirectly through the dc–dc converter. However, the control and modulation strategies are the major challenges for this configuration. This study proposes a control scheme based on asymmetrical sinusoidal pulse width modulation (SPWM) to realize high-efficiency active power delivery, thereby addressing the issue above. The mechanism of the modulation scheme to regulate active power is revealed, and the voltage variation of the battery is considered. The modified SPWM strategy features easy implementation and a low computation burden. The effectiveness of the system with the proposed control and modulation schemes is verified by both simulation and experimental results.

与电池储能系统集成的统一电能质量调节器（UPQC）不仅可以缓解电网侧和负载侧的电能质量问题，还可以为负载或电网提供有功功率。电池的宽电压变化和整个系统的高效率可以通过混合连接配置实现，即电池通过dc-dc转换器直接或间接同时连接到UPQC的串联和并联转换器。然而，控制和调制策略是这种配置的主要挑战。本研究提出了一种基于非对称正弦脉冲宽度调制 (SPWM) 的控制方案，以实现高效的有源功率输送，从而解决上述问题。揭示了调制方案调节有功功率的机制，并考虑了电池的电压变化。修改后的 SPWM 策略具有易于实现和低计算负担的特点。通过仿真和实验结果验证了系统与所提出的控制和调制方案的有效性。