Comprehensive Reactive Power Support of DFIG Adapted to Different Depth of Voltage Sags

Yangwu Shen, Mingjian Cui, Qin Wang, Feifan Shen, Bin Zhang and Liqing Liang
Additional contact information
Yangwu Shen: Sate Grid Hunan Electric Power Corporation Research Institute, Changsha, Hunan 410007, China
Mingjian Cui: Department of Mechanical Engineering, University of Texas at Dallas, Richardson, TX 75080, USA
Qin Wang: Electric Power Research Institute, Palo Alto, CA 94304, USA
Feifan Shen: School of Electrical Engineering, Wuhan University, Wuhan, Hubei 430072, China
Bin Zhang: Sate Grid Hunan Electric Power Corporation Research Institute, Changsha, Hunan 410007, China
Liqing Liang: Sate Grid Hunan Electric Power Corporation Research Institute, Changsha, Hunan 410007, China

Energies, 2017, vol. 10, issue 6, 1-20

Abstract: The low voltage ride-through (LVRT) capability of the doubly-fed induction generator (DFIG) significantly impacts upon the integration of wind power into the power grid. This paper develops a novel comprehensive control strategy to enhance the LVRT and reactive power support capacities of the DFIG by installing the energy storage system (ESS). The ESS is connected to the DC-link capacitor of the DFIG and used to regulate the DC-link voltage during normal or fault operations. The unbalanced power between the captured wind power and the power injected to the grid during the transient process is absorbed or compensated by the ESS. The rotor-side converter (RSC) is used to control the maximum power production and the grid-side converter (GSC) is used to control the reactive power before participating in the voltage support. When the supply voltage continues to drop, the rotor speed is increased by controlling the RSC to realize the LVRT capability and help the GSC further enhance the reactive power support capability. The capacity of the GSC is dedicated to injecting the reactive power to the grid. An auxiliary transient pitch angle controller is proposed to protect the generator’s over speed. Both RSC and GSC act as reactive power sources to further enhance the voltage support capability with serious voltage sags. Simulations based on a single-machine infinite-bus power system verify the effectiveness of the developed comprehensive control strategy.

Keywords: doubly-fed induction generator; energy storage system; low voltage ride-through; static synchronous compensator; voltage support (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (7)

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