针对非有效接地配电网中单相接地故障消弧与保护的难题，首先提出了基于线电压组合调控的配电网单相接地故障消弧方法，利用单相接地故障及调控过程线电压恒定不变特征，由可调注入变从系统获取三相线电压，调节注入变压器变比及二次侧开关灵活调控零序电压，主动抑制故障相电压至0，实现接地故障可靠消弧。进一步提出基于线电压组合调控的配电网单相接地故障类型及馈线辨识方法，分析注入变压器变比改变前后注入电流、零序电压及各馈线零序电流变化特征，构建了基于相角差及导纳比的接地故障类型及馈线双重辨识判据，实现接地故障类型及故障馈线灵敏辨识。在PSCAD/EMTDC仿真环境中对所提方法进行验证，仿真结果表明该方法能够有效抑制接地故障电弧，并实现接地故障类型及馈线的主动灵敏准确辨识，提升配电网安全可靠运行能力。

Aiming at the problem of arc suppression and protection of single-phase grounding fault in non effectively grounded distribution network, a single-phase grounding fault arc suppression method based on line voltage combination regulation of distribution network is proposed. Using the characteristics of single-phase grounding fault and line voltage constant in the regulation process, the three-phase line voltage is obtained from the adjustable injection transformer from the system, the injection transformer ratio and the secondary side switch are adjusted to flexibly regulate the zero sequence voltage, and the fault phase voltage is actively suppressed to 0, which realizes reliable arc suppression of grounding fault. Furthermore, a single-phase grounding fault type and feeder identification method based on the combined regulation of line voltage in distribution network is proposed. The change characteristics of injection current, zero sequence voltage and zero sequence current of each feeder before and after the change of injection transformation ratio are analyzed. The double identification criteria of ground fault type and feeder based on phase angle difference and admittance ratio are constructed to realize the sensitive identification of ground fault type and fault feeder. The proposed method is verified in PSCAD/EMTDC simulation environment. The simulation results show that the method can effectively suppress the grounding fault arc, realize the active, sensitive and accurate identification of grounding fault types and feeders, and improve the safe and reliable operation ability of distribution network.