TY  - EJOU
AU  - Liu, Sumei 
AU  - Wu, Jizeng 
AU  - Zhang, Yinghong 
AU  - Zheng, Ran 

TI  - A Novel Control-Protection Coordination Strategy of Power Lines Connected with Inverter-Based Resources
T2  - Energy Engineering

PY  - 
VL  - 
IS  - 
SN  - 1546-0118

AB  - The unique fault current characteristics of inverter-based resources (IBRs) result in a variable angle of the additional impedance for conventional distance protection, causing failure to operate for internal faults and maloperation for external faults. To address this issue, a novel control-protection coordinated strategy is proposed. The positive-sequence current references of IBRs’ inverter control strategy are reset, based on the relationship between the current on the high-voltage side of the transformer and that of the fault-point current. Under such control, the additional impedance angle can be effectively maintained at a constant value. On this basis, a single-ended protection principle immune to the additional impedance is developed. The proposed control-protection coordinated strategy can effectively identify internal and external faults under high-penetration IBRs integration, without substantially modifying the existing inverter control and protection framework. Compared with existing control-protection coordinated strategies, the proposed improved control strategy will not affect the stability of inverter control, nor will it generate additional harmonics. The proposed protection strategy still adopts conventional power-frequency voltage and current quantities for fault identification, facilitating its implementation.
KW  - Distance protection; control-protection coordination; additional impedance

DO  - 10.32604/ee.2026.081082