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Traditional permanent magnet synchronous generator (PMSG)‐based wind turbine (WT) normally utilises phase lock loop (PLL) for obtaining accurate phase angle of AC grid to make sure of maximum power point tracking (MPPT). However, a weak AC system with a low short circuit ratio (SCR) and high control bandwidth of PLL might have impaired effects on the stability of the system. To overcome these, a novel power synchronous control of PMSG‐based WT with grid forming ability of PMSG for integrating very weak AC system is first proposed in this study. Grid‐side converter (GSC) of PMSG emulates the inertia response of synchronous generator (SG) by artificially coupling the DC‐link voltage with the grid frequency based on the certain droop property, while the converter voltage magnitude is regulated according to DC‐link voltage deviation by controlling the modulation index of GSC. This novel scheme can realise the grid synchronisation without PLL by mimicking the natural characteristic of SG. Small‐signal analysis of the proposed scheme indicates the DC‐link capacitor energy can be exerted for system inertia support during system disturbances, while the system damping can be provided by spontaneously alternating converter voltage magnitude. More importantly, MPPT property of PMSG is not compromised while providing inertia and damping for the system, and the related inertia and damping coefficient of WT with the proposed control can be easily tuned for satisfying the system requirement. Non‐linear simulations of one PMSG connected with one large SG considering a sudden change of active power reference and variable wind speeds have been studied to verify the effectiveness of the proposed grid‐forming control.
Yujun Li; Xiaotian Yuan; Jiapeng Li; HuangQing Xiao; Zhao Xu; Zhengchun Du. Novel grid‐forming control of PMSG‐based wind turbine for integrating weak AC grid without sacrificing maximum power point tracking. IET Generation, Transmission & Distribution 2021, 15, 1613 -1625.
AMA StyleYujun Li, Xiaotian Yuan, Jiapeng Li, HuangQing Xiao, Zhao Xu, Zhengchun Du. Novel grid‐forming control of PMSG‐based wind turbine for integrating weak AC grid without sacrificing maximum power point tracking. IET Generation, Transmission & Distribution. 2021; 15 (10):1613-1625.
Chicago/Turabian StyleYujun Li; Xiaotian Yuan; Jiapeng Li; HuangQing Xiao; Zhao Xu; Zhengchun Du. 2021. "Novel grid‐forming control of PMSG‐based wind turbine for integrating weak AC grid without sacrificing maximum power point tracking." IET Generation, Transmission & Distribution 15, no. 10: 1613-1625.
Multimodal sub-synchronous resonance (SSR) induced by the interactions between the generator shafts and the fixed series capacitors has become a serious threat for the power system. To overcome this, a voltage source converter (VSC) based controller for multimodal SSR suppression, named sub-synchronous resonance dynamic suppressor (SSRDS), is presented and analyzed in this paper. The controller is placed at the point of common coupling (PCC) of the power plant for multi-generator SSR suppression purpose so that the investment costs can be minimized while making sure the requirements of the SSR damping. To quantify the contribution of SSRDS to the SSR damping, the damping torque analysis is carried out, which can reveal the influences of the operating conditions and the correlated control parameters on the damping performance. Furthermore, to avoid the negative affects between the different TMs in close range as well as maximize the damping ability of SSRDS, the parameters tuning method of the mode filters and the gain and phase shifters are proposed. A detailed nonlinear simulation model is established in PSCAD/EMTDC based on the Jinjie series compensated transmission system located in China. The damping torque analysis, the eigenvalues analysis and the simulation results have fully demonstrated the effectiveness and the robustness of the proposed SSRDS for multi-generator and multimodal SSR suppression under both small and large disturbances in various operating conditions.
Xiaotian Yuan; Zhengchun Du; Xiaofang Wu; Guihong Wu; Shuai Gao; Feng Zeng; Chongtao Li. An Effective Control Scheme for Multimodal SSR Suppression via VSC-Based Controller. IEEE Access 2020, 8, 172581 -172592.
AMA StyleXiaotian Yuan, Zhengchun Du, Xiaofang Wu, Guihong Wu, Shuai Gao, Feng Zeng, Chongtao Li. An Effective Control Scheme for Multimodal SSR Suppression via VSC-Based Controller. IEEE Access. 2020; 8 (99):172581-172592.
Chicago/Turabian StyleXiaotian Yuan; Zhengchun Du; Xiaofang Wu; Guihong Wu; Shuai Gao; Feng Zeng; Chongtao Li. 2020. "An Effective Control Scheme for Multimodal SSR Suppression via VSC-Based Controller." IEEE Access 8, no. 99: 172581-172592.
Xiaofang Wu; Zhengchun Du; Xiaotian Yuan; Guihong Wu; Feng Zeng. Subsynchronous Oscillation Analysis of Grid-Connected Converter Based on MIMO Transfer Functions. IEEE Access 2020, 8, 92089 -92097.
AMA StyleXiaofang Wu, Zhengchun Du, Xiaotian Yuan, Guihong Wu, Feng Zeng. Subsynchronous Oscillation Analysis of Grid-Connected Converter Based on MIMO Transfer Functions. IEEE Access. 2020; 8 ():92089-92097.
Chicago/Turabian StyleXiaofang Wu; Zhengchun Du; Xiaotian Yuan; Guihong Wu; Feng Zeng. 2020. "Subsynchronous Oscillation Analysis of Grid-Connected Converter Based on MIMO Transfer Functions." IEEE Access 8, no. : 92089-92097.
Subsynchronous oscillation (SSO) is a critical issue for the direct-drive permanent magnet synchronous generator (D-PMSG) based wind farm integrated to a weak onshore AC grid. To analyze the mechanism of the SSO phenomenon of D-PMSG based wind farm, widely used impedance-based stability analysis method is utilized in this paper. First, the impedance model based on the harmonic linearization theory of grid-connected D-PMSG is proposed, and the mechanism of sub/supsynchronous currents coupling is analyzed quantitatively for the first time. Then, based on the impedance model and relative stability criterion, the influence of wind farm operating parameters and grid impedance on stability is discussed. Simulations are carried out to verify the correctness of theoretical analysis.
Saijun Yuan; Zhiguo Hao; Tao Zhang; Xiaotian Yuan; Jin Shu. Impedance Modeling Based Method for Sub/Supsynchronous Oscillation Analysis of D-PMSG Wind Farm. Applied Sciences 2019, 9, 2831 .
AMA StyleSaijun Yuan, Zhiguo Hao, Tao Zhang, Xiaotian Yuan, Jin Shu. Impedance Modeling Based Method for Sub/Supsynchronous Oscillation Analysis of D-PMSG Wind Farm. Applied Sciences. 2019; 9 (14):2831.
Chicago/Turabian StyleSaijun Yuan; Zhiguo Hao; Tao Zhang; Xiaotian Yuan; Jin Shu. 2019. "Impedance Modeling Based Method for Sub/Supsynchronous Oscillation Analysis of D-PMSG Wind Farm." Applied Sciences 9, no. 14: 2831.