Abstract
The Brushless Doubly Fed Induction Generator (BDFIG) has huge potential for wind power systems due to its high reliability and low maintenance cost. To add inertia for system stability enhancement, as well as to maintain the uninterrupted operation during symmetrical grid faults, this study proposes a Virtual Synchronous Control (VSC) with a transient current compensation strategy for BDFIG. The proposed VSC is realized by regulating the virtual inner electrical potential and angular velocity of BDFIG under Control Winding (CW) current oriented vector control, and compensating for the transient CW current to weaken the transient inner electrical potential under symmetrical grid faults. Modeling and analysis of such a VSC strategy are presented in this paper, and a simulation is also made to compare the performances of existing and proposed VSC strategies. It is shown that the merits of the proposed VSC can enhance the fault ride through the ability of the BDFIG system and support the recovery of grid voltage.
Highlights
Wind is a kind of economical and clean renewable resource, and with the developing maturity of technology, wind energy has become one of the most popular renewable energies for electrical power generation
This paper studies the Virtual Synchronous Control (VSC) of Brushless Doubly Fed Induction Generator (BDFIG) and introduces a Control Winding (CW) transient current compensation based on CW current oriented vector control
The proposed control strategy makes the BDFIG simulate the behavior of Synchronous Generator (SG)
Summary
Wind is a kind of economical and clean renewable resource, and with the developing maturity of technology, wind energy has become one of the most popular renewable energies for electrical power generation. Wind power inherits intermittent and random characteristics, which is very different from conventional power from the Synchronous Generator (SG). When large-scale wind power is connected to the power grid, the stability of the whole power system will be inevitably impacted. This is because wind turbines connect to the power grid via power electronics interfaces, and the controllers of traditional power electronics interfaces aim to make the active power and reactive power track to the references with a fast response, without considering the voltage/frequency states of the power grid. The high penetration level of wind turbines and power electronics interfaces will decrease the total system inertia and lower the voltage/frequency stabilization compared to conventional synchronous generating units. The large voltage/frequency deviation might result in separation of the power system [1,2,3,4]
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