Abstract
This paper presents the analysis and mitigation of sub-synchronous resonance (SSR) for doubly fed induction generators (DFIG) under virtual synchronous generator (VSG) control, based on impedance methods. VSGs are considered to have grid-supporting ability and good stability in inductance-based weak grids, and are implemented in renewable power generations, including DFIG systems. However, stability analyses of VSGs for DFIG connecting with series capacitor compensation are absent. Therefore, this paper focuses on the analysis and mitigation of SSR for DFIG under VSG control. Impedance modeling of DFIG systems is used to analyze SSR stability. Based on impedance analysis, the influence of VSG control parameters and the configuration of damping factor of reactive power are discussed. Next, a parameter configuration method to mitigate SSR is proposed. Finally, time-domain simulation and fast fourier transform (FFT) results are given to validate the correctness and effectiveness of the impedance model and parameter configuration methods.
Highlights
Wind power generation systems (WPGS) based on doubly fed induction generator (DFIG), which has the advantages of relatively low cost and variable speed constant frequency operation, have been widely installed worldwide [1,2]
Since the calculation of rotor voltage are applied in virtual synchronous reference frame (VSRF), the park transformation and inverse park transformation are used in virtual synchronous generator (VSG) control
The small signal models of DFIG and VSG control have been obtained in Figure 3 and Figure 4, The small signal models of DFIG and VSG control have been obtained in Figures 3 and 4, respectively
Summary
Renewable power generation has developed rapidly. Wind power generation systems (WPGS) based on doubly fed induction generator (DFIG), which has the advantages of relatively low cost and variable speed constant frequency operation, have been widely installed worldwide [1,2]. Series capacitors in transmission lines, which connects weak grid with DFIG based wind farms, may cause sub-synchronous resonance (SSR). The studies of modeling, analyzing and mitigating control strategy for DFIG-based wind farms interconnected with series compensation have been reported in [14,15,16,17,18,19,20]. The impacts of series compensation level, wind speed and current loop gains on SSR are studied in [15,16]. The impedance model of VSG control for DFIG including voltage control loop should be developed.
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