Direct-current transmission line protection method and system based on pure current characteristics

US11973340B2 · kind B2 · utility

Assignees

• CHINA ELECTRIC POWER RESEARCH INSTITUTE · CN
• State Grid Corporation of China · CN

Inventors

• Zexin Zhou · Shanghai, CN
• Huanzhang Liu · 红钢城街道, CN
• Pengfei Lv · Beijing, CN
• Hong-Xi Cao · Beijing, CN
• Xingguo Wang · Fremont, US
• Siye Ruan · Beijing, CN
• Dingxiang Du · Beijing, CN
• Yong Li · Tianjin, CN
• Guosheng YANG · Beijing, CN
• Mingliang JIN · 红钢城街道, CN

Key dates

• Filing date: Jun 18, 2020
• Grant date: Apr 30, 2024
• Expiry date: May 11, 2041

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02H3/286
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A line current iM(k0) of an M side of a first direct-current transmission line is collected at a moment k0. A line current iM(k0−ts) thereof is collected at k0−ts. At a moment k0, a differential value diM(k0) of a current of the side of the first direct-current transmission line is calculated according to the line current iM(k0) and the line current iM(k0−ts). It is determined whether the differential value diM(k0) of the current meets a protection enabling criteria. If so, direct-current protection for the M side of the first direct-current transmission line is enabled. A line current iM(j) of the M side of the first direct-current transmission line is collected at a moment j. A line current iM(j−ts) thereof is collected at a moment j−ts. A differential value diM(j) of the current of the M side of the first direct-current transmission line at the moment j is calculated according to the line current iM(j) and the line current iM(j−ts).