中文摘要：

电网电压的骤升会带来新能源发电系统并网逆变器（grid-connected inverter，GCI）控制裕度的下降，如若失控则会导致能量由电网倒灌进入逆变器进而引发直流侧过压或过流。为改善电网电压骤升对 GCI 所造成的暂态冲击，确保其安全并网运行，该文提出一种 GCI 高电压穿越（high voltage ride-through，HVRT）控制策略。首先分析容量限制条件下 GCI 的电流控制能力，讨论不同电网电压骤升幅度情况下 GCI 的可控区。在此基础上，设计基于电网电压和发电侧负载电流信息的直流母线电压参考值自适应调节算法，以确保电网电压骤升期间 GCI 的可控性。最后，结合感性无功电流控制，给出GCI的HVRT方案。仿真和实验结果验证了 GCI 控制能力分析的正确性和所提出控制策略的有效性。

英文摘要：

Grid voltage swell will reduce the control margins of grid-connected inverter （GCI） for renewable energy systems, and the uncontrollability of GCI could lead to the reversal of power flow in the inverter which may result in over-voltage of the DC-link capacitors or over-current of the inverter. In order to relieve the transient impacts on GCI caused by grid voltage swell and ensure the safe grid-connected operation of GCI, a new high voltage ride-through （HVRT） control strategy of the GCI was presented. In this paper, the controllability of GCI considering its rating limitation was firstly analyzed, and the corresponding controllable regions for different grid voltage swell ranges were also discussed. After that, an adaptive adjustment algorithm of the DC-link voltage reference was designed by means of the information of grid voltage and the load current of GCI, so that the GCI can always remain controllable. At last, combining with the control of GCI’s inductive reactive current, the whole HVRT scheme of GCI was proposed. The accuracy of calculated GCI’s controllable regions and the effectiveness of proposed control strategy for GCI during grid voltage swell were both validated by the simulated and experimental results.