Advanced Vector Control Design for DFIM-Based Hydropower Storage for Fault Ride-Through Enhancement

Abstract

This paper proposes an advanced vector control method for rotor side converter of doubly-fed induction machine (DFIM)-based storage hydropower in order to enhance the fault ride-through capability in both generating and motor modes. In this method, the active power and stator voltage control loops are on the d-axis and q-axis, respectively. Since the active power and the stator voltage control loops are inherently slow and nonlinear, an effective input signal (EIS) based on Lyapunov theory is designed and added to the d-axis of the rotor voltage. It is shown that the EIS can compensate the induced voltage in the rotor windings, rotor back electromotive force during the large disturbances, when it is added to the conventional vector controller. The sizing of the converters, considering the active and reactive power priority, are also investigated in order for the EIS to comply to the existing actual limitations. The effectiveness of the proposed rotor side controller is examined in a 381 MVA adjustable speed-pumped storage hydropower, operating in both generating and motor modes. Finally, simulation results performed in Matlab/SimPowerSys is presented in order to validate the proposed control system. Index Terms-Adjustable speed-pumped storage plant, doubly fed induction machine (DFIM), fault ride-through, nonlinear control.

Advantages of variable‐speed pumped storage plants in generating phase‐modulation mode: rapidity and stability

“…Vector control is widely applied in the DFIM and the theory of decoupling control is introduced in Section 2.2.1 [26]. Based on the theory, the mathematical model of the rotor side converter is analysed and built‐in Section 2.2.2.…”

Variable-Speed Operation of Hydropower Plants: A Look at the Past, Present, and Future

“…• The performance of DfIMs during grid failure and in meeting grid code requirements, specifically lowvoltage ride through (lVrT), can be challenging [24], [33], [49], [51], [52]. In this situation, the rotor voltage dynamically increases, and a special protection scheme must be designed to protect the converter [24], [52]. In the worst case (i.e., severe short circuit faults), a crowbar must be activated, short-circuiting the rotor windings, to protect the converter against the overvoltages before the circuit breakers switch off the drive.…”

Analysis of Control Characteristics and Design of Control System Based on Internal Parameters in Doubly Fed Variable‐Speed Pumped Storage Unit

“…Some literatures have studied the converters and power electronics of the DFVSPS unit [15][16][17]. In addition, some literatures have studied the characteristics of the doubly fed variable-speed pumped-storage unit in the event of a failure [18,19]. e DFVSPS unit is a huge system, including pump turbine, doubly fed induction motor (DFIM), inverter, control system, etc.…”