Impact of DFIG‐based wind farm integration on sub‐synchronous torsional interaction between HVDC and thermal generators

Analysis of Subsynchronous Torsional of Wind–Thermal Bundled System Transmitted via HVDC Based on Signal Injection Method

“…When the excitation signal is removed, the rotational speed of the torsional vibration mode decays exponentially. Solving Equation (16) can obtain the expression of shafting torsional vibration, which can be expressed as shown in Equations (17) and (18).…”

“…In order to verify the correctness of the theoretical analysis, a simulation model of DFIGs, SGs, and HVDC connected to a grid system was built in EMTDC/PSCAD. Among them, the SG adopted the IEEE SSR first standard model, and the simulation parameters of SG were as shown in [17]. The HVDC adopted the CIGRE Benchmark Model, whose rated transmission power was 1000 MW.…”

“…Focusing on the power oscillation problem of the sending network, domestic and foreign scholars have investigated the following aspects using the eigenvalue method, complex torque coefficient approach, impedance analysis approach, etc: (1) the problem of SSO in SGs via HVDC transmission [9][10][11]; (2) the SSO of wind turbines transmitted via HVDC [12][13][14][15]; (3) the SSO of wind-thermal bundled systems transmitted via HVDC [16][17][18].…”

“…The research on the interaction between SGs or wind turbines and HVDC has been relatively complete, but the research on the interaction of wind turbines, SGs, and HVDC is still rare. The oscillation mechanism of the wind-thermal bundled system transmitted via HVDC was evaluated using a time-domain simulation and eigenvalue analysis in [16,17], pointing out that the connection of DFIG can alleviate the SSO of SGs caused by HVDC. The authors of [18] proposed an active disturbance rejection additional damping control using the least square to suppress the shaft torsional vibration of the wind-thermal bundled system effectively transmitted via HVDC.…”

Doubly fed induction generators to enhance inter-area damping based on a Robust controller: $${{\varvec{H}}}_{2}/{{\varvec{H}}}_{\infty }$$ Control

“…The increasing development of the wind energy-based applications imposes new challenges on the stability and performance of the power systems. Nowadays, among the various wind turbine topologies, the variable-speed wind turbines with the doubly-fed induction generators (DFIGs) are preferred due to its capability in maximum power tracking also grid side converter facilitates the power exchange through the rotor converter, in addition provides additional reactive power support [1]. Most of the electromechanical oscillations arise from the synchronous machines [2].…”