An Ultra-Fast Inrush-Current-Free Startup Method for Grid-tie Inverter without Voltage Sensors

Yuchen He, Yuan Li, Bokang Zhou, Yuntao Zou, F. Peng
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引用次数: 6

Abstract

This paper proposes an ultra-fast inrush-current-free startup method for grid-tie inverters without voltage sensors and phase-locked loop (PLL). Traditionally, the grid-tie inverter needs the voltage measured from points of common couplings (PCC) to generate the phase angle via PLL for inverter pulse-width-modulation (PWM) signals. The startup procedure is slow and inrush current occurs if the initial PWM does not match the unknown grid voltage well. This paper proposes a startup method that only uses measured inverter ac currents to generate the initial PWM by controlling the current to zero. The generated PWM pattern can be used to reproduce the real grid voltage regardless of the grid impedance. The zero-crossing points of the grid voltage are detected and then used for grid synchronization. The proposed startup procedure only needs a few cycles (16.67 ms/cycle) to reliably synchronize the inverter to the grid without any inrush current. Simulation and experimental results are presented to verify the effectiveness of this control strategy.
无电压传感器并网逆变器超快速无涌流启动方法
提出了一种无电压传感器和锁相环并网逆变器的超快速无涌流启动方法。传统的并网逆变器需要从共耦合点(PCC)测量电压,通过锁相环产生相角,用于逆变器脉宽调制(PWM)信号。启动过程缓慢,如果初始PWM与未知电网电压不匹配,则会产生涌流。本文提出了一种仅利用测量到的逆变器交流电流通过控制电流为零来产生初始PWM的启动方法。所产生的PWM模式可用于再现真实的电网电压,而不考虑电网阻抗。检测电网电压的过零点,然后用于电网同步。所提出的启动过程只需要几个周期(16.67 ms/cycle),就可以在没有任何涌流的情况下可靠地将逆变器同步到电网。仿真和实验结果验证了该控制策略的有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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