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发明公开
CN103986130A 风电接入交直流混联电网的800kVHVDC线路保护系统 无效 - 驳回

风电接入交直流混联电网的800kVHVDC线路保护系统
摘要：
本发明公开了一种风电接入交直流混联电网的800kV HVDC线路保护系统，所述系统配置如下：主保护配置：采用行波暂态量保护和微分欠压保护；微分欠压保护依靠检测电压微分数值和电压幅值水平实现保护，为直流输电线路的主保护，同时作为行波保护的后备；后备保护配置：低电压保护和纵联电流差动保护，低电压保护用于切除行波和微分欠压保护未能动作的高阻故障，在电流差动保护之前动作。达到了在大规模风电接入交直流混联电网的情况下保证电网安全稳定运行的目的。
摘要（英）：

The invention discloses an 800 kV HVDC line protection system of a wind electricity connecting alternating-current/direct-current parallel-serial power grid. The system comprises main protection configuration and backup protection configuration. According to the main protection configuration, traveling wave transient state quantity protection and differential under-voltage protection are used, the differential under-voltage protection is achieved through detected voltage differential values and the voltage amplitude level and is main protection of a direct-current power transmission line, and meanwhile the differential under-voltage protection is used as backup of the traveling wave protection. According to the backup protection configuration, low-voltage protection and longitudinal-connecting current differential protection are included, the low-voltage protection is used for removing high-resistance fault due to which the traveling wave protection and the differential under-voltage protection cannot be operated, and action is achieved before the current differential protection. The purpose of power grid safe and stable operation under the situation that large-scale wind electricity is connected into the alternating-current/direct-current parallel-serial power grid is achieved.

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