Fault recovery control method and system for multi-infeed direct-current power transmission system

• Main Authors: ZHOU BAORONG, YAO WENFENG, FENG MING, LI XINGYUAN, HONG CHAO
• Format: Patent
• Language: English
• Published: 18.11.2015
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERATION; REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGYGENERATION, TRANSMISSION OR DISTRIBUTION; SYSTEMS FOR STORING ELECTRIC ENERGY; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

The invention relates to a fault recovery control method for a multi-infeed direct-current power transmission system. The method comprises the following steps: acquiring a fault signal from a receiving-end alternating-current system, and judging whether the receiving-end alternating-current system fails according to the fault signal; acquiring the multi-infeed effective short-circuit ratio and the power base value ratio of each high-voltage and direct-current power transmission subsystem if the receiving-end alternating-current system fails; respectively calculating the product of the multi-infeed effective short-circuit ratio and the power base value ratio of each high-voltage and direct-current power transmission subsystem to obtain a multi-infeed power recovery factor of the high-voltage power transmission subsystem; and generating a power modulation signal according to each multi-infeed power recovery factor and sending the power modulation signal to a power modulator of the corresponding high-voltage and direct-current power transmission subsystem to make the corresponding high-voltage and direct-current power transmission subsystem recover from failure at a power recovery rate corresponding to the power modulation signal. The influence of fault recovery of each high-voltage and direct-current power transmission subsystem to the whole multi-infeed direct-current system can be evaluated comprehensively according to multiple factors, and the stability of fault recovery is improved.