Yongqi Li
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Research Subjects
Yongqi Li has a total of 3 co-authors. Here are the top co-authors by number of shared publications:
- Gongwen Zhang
Qingyuan Yingde Power Supply Bureau, Guangdong Power Grid Co., Ltd., Qingyuan 513000, China
1 shared publication - Lixia Zhang
The College of New Energy, China University of Petroleum (East China), Qingdao 266580, China
1 shared publication - Wei Kang
The College of New Energy, China University of Petroleum (East China), Qingdao 266580, China
1 shared publication
Latest Publications
- Open Access
Time–Domain Distance Protection Scheme Based on Hybrid-π Model for Transmission Lines of Doubly Fed Wind Farm
Due to the controlled characteristics of fault current in doubly fed wind farms and the distributed capacitance effects of transmission lines, traditional distance protection is prone to failure or maloperation during high resistance faults. To improve protection reliability, this paper proposes a novel time–domain distance protection scheme based on the hybrid-π model. First, the improved time–domain fault differential equations are formulated based on the hybrid-π model, incorporating ground capacitance and integrating electrical quantities at both ends of the line. Next, the composite weight matrix integrating transient mutation weights and fitting error weights is introduced and embedded within a nonlinear least-squares framework. This enables the algorithm to adaptively distinguish and suppress unreliable data, simultaneously achieving transient disturbance resistance and rapid steady-state convergence. Finally, a 220 kV double-fed wind power grid-connected system with a 100 km transmission line is built in MATLAB/Simulink for simulation. Different types of faults under various locations and transition resistances are simulated to verify the effectiveness of the proposed scheme.
Open AccessTime–Domain Distance Protection Scheme Based on Hybrid-π Model for Transmission Lines of Doubly Fed Wind Farm
Due to the controlled characteristics of fault current in doubly fed wind farms and the distributed capacitance effects of transmission lines, traditional distance protection is prone to failure or maloperation during high resistance faults. To improve protection reliability, this paper proposes a novel time–domain distance protection scheme based on the hybrid-π model. First, the improved time–domain fault differential equations are formulated based on the hybrid-π model, incorporating ground capacitance and integrating electrical quantities at both ends of the line. Next, the composite weight matrix integrating transient mutation weights and fitting error weights is introduced and embedded within a nonlinear least-squares framework. This enables the algorithm to adaptively distinguish and suppress unreliable data, simultaneously achieving transient disturbance resistance and rapid steady-state convergence. Finally, a 220 kV double-fed wind power grid-connected system with a 100 km transmission line is built in MATLAB/Simulink for simulation. Different types of faults under various locations and transition resistances are simulated to verify the effectiveness of the proposed scheme.