A dual-dc-port dc–ac converter with virtual space vector pulsewidth modulation (SVPWM) based flexible power control is proposed for photovoltaic (PV)-battery hybrid systems. Two dc ports, in which one dc port is interfaced with PV and the other dc port is interfaced with the battery, are provided simultaneously by the dual-dc-port dc–ac converter. Hence, all the active power is transferred within single power conversion stage, and the dc–dc converter between PV and battery is removed. To realize flexible power control between PV, battery, and ac grid, a new control scheme consisting of an outer power loop and an inner virtual SVPWM is proposed, with fully considering the voltage variation of both PV and battery. Operation principle and power control capability of the dual-dc-port dc–ac converter are analyzed in detail. The effectiveness of the proposed solution is validated by experimental results.

中文翻译：

---

光伏/电池混合系统中双直流端口 DC-C 转换器基于虚拟 SVPWM 的灵活功率控制


提出了一种用于光伏（PV）-电池混合系统的双直流端口直流-交流转换器，其具有基于虚拟空间矢量脉宽调制（SVPWM）的灵活功率控制。双直流端口直流-交流转换器同时提供两个直流端口，其中一个直流端口与光伏连接，另一个直流端口与电池连接。因此，所有有功功率都在单个功率转换级内传输，并且取消了PV和电池之间的dc-dc转换器。为了实现光伏、电池和交流电网之间的灵活功率控制，提出了一种由外部功率环和内部虚拟SVPWM组成的新控制方案，充分考虑了光伏和电池的电压变化。详细分析了双直流端口DC-AC转换器的工作原理和功率控制能力。实验结果验证了所提出解决方案的有效性。