AC/DC Fault-ride-through Control for Single-phase PV Inverter

M. Talha, S. Raihan, Nasrudin Abd. Rahim
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Abstract

Single-phase low-power PV generators will be a dominant contributor to electricity in microgrids. However, PV-inverters are susceptible to input and output disturbances. On the one hand, the inverters disconnect entirely for a few minutes during grid sags. On the other hand, the inverter's power output drops during low solar insolence, leading to grid voltage flickers. Moreover, the conventional low voltage ride-through (LVRT) solutions can only handle fixed intensity sags, while the real grid environment may have milder to severe sags. This paper aims to present an LVRT strategy to handle all kinds of sags and compensate for rapid solar intermittencies while ensuring maximum power point tracking (MPPT) operation. A small energy storage buffer is coupled to the inverter's DC-link to compensate for AC and DC disturbances. During sags, the excess energy in the inverter's DC-link is absorbed by the buffer. In contrast, the buffer provides the deficit energy to maintain the constant power output in solar intermittencies. Experimental results show that the inverter can sustain variable intensity sags and compensate for rapid solar intermittencies. Moreover, the inverter always ensures MPPT operation and also provides reactive power during sags.
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单相光伏逆变器交直流故障穿越控制
单相低功率光伏发电机将成为微电网的主要电力来源。然而,pv逆变器容易受到输入和输出干扰。一方面,在电网下降期间,逆变器会完全断开几分钟。另一方面,低日照时逆变器输出功率下降,导致电网电压闪变。此外,传统的低压穿越(LVRT)解决方案只能处理固定强度的凹陷,而真实的电网环境可能有较轻到严重的凹陷。本文旨在提出一种LVRT策略,在保证最大功率点跟踪(MPPT)运行的同时,处理各种波动和补偿快速的太阳能间歇性。一个小的储能缓冲器耦合到逆变器的直流链路上,以补偿交流和直流干扰。在下垂期间,逆变器直流链路中的多余能量被缓冲器吸收。相反,缓冲器提供了亏能,以维持太阳能间歇性的恒定功率输出。实验结果表明,该逆变器能够承受变强度下降,并能补偿快速的太阳能间歇性。此外,逆变器始终确保MPPT运行,并在低谷期间提供无功功率。
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