Nonlinear controller based on state feedback linearization for series-compensated DFIG-based wind power plants to mitigate sub-synchronous control interaction

Li, Penghan; Wang, Jie; Wu, Fei; Li, Hao

doi:10.1002/etep.2682

Cited by 54 publications

(34 citation statements)

References 43 publications

(62 reference statements)

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“…The WTGs are broadly classified as squirrel‐cage induction generator (SCIG), doubly fed induction generator (DFIG), synchronous generators (SGs), permanent magnet synchronous generators (PMSGs), etc. The state of art WECs makes use of DFIG‐based WTG since the DFIG consists of its own RSC and GSC for the control of active‐reactive power and DC link voltage etc . The wind farms are located far away from the grid, hence it is essential to use high capacity, long‐distance transmission network for grid integration.…”

Section: Introductionmentioning

confidence: 99%

“…The state of art WECs makes use of DFIG-based WTG since the DFIG consists of its own RSC and GSC for the control of active-reactive power and DC link voltage etc. [1][2][3] The wind farms are located far away from the grid, hence it is essential to use high capacity, long-distance transmission network for grid integration. Use of long-distance transmission line results in reduction of transmission capacity.…”

Section: Introductionmentioning

confidence: 99%

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Detailed modelling and development of a laboratory prototype for the analysis of subsynchronous resonance in DFIG‐based wind farm

Mahalakshmi

Thampatty

2020

Int Trans Electr Energ Syst

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Summary The interconnection between the grid and nonconventional energy sources has become more essential due to the huge rise in energy demand. In the case of wind energy, the grid integration undergoes lots of stability issues. The long‐distance transmission lines are preferred since the wind farms are positioned far from the grid. However, this lowers the bulk power transfer ability of the line. The simple solution to enhance the power transfer capacity is the insertion of series capacitor in the line. However, the frightening factor in inserting the series capacitor is subsynchronous resonance (SSR) oscillations which can lead to shaft fatigue between turbine and generator set. This paper focuses on the analysis of SSR in series‐compensated doubly fed induction generator (DFIG)–based wind energy conversion systems (WECSs). The detailed mathematical modelling of DFIG‐based wind turbine generator (WTG) in state space form which is essential for SSR analysis is explained. The proposed model is found to be more accurate as it includes the dynamics of the rotor‐side converter (RSC) and grid‐side converter (GSC). The influence of series capacitive compensation in a WECs is dealt by employing eigenvalue approach. The developed model is embedded with RSC and GSC controllers for analyzing SSR effect for different operating conditions such as wind speed variations and varying compensation levels using MATLAB/SIMULINK. Also, the scaled‐down model of a 2‐MW wind turbine is deployed in laboratory using a grid‐integrated, series‐compensated 1.1‐kW DFIG machine to realize the influence of series capacitive compensation. It is found that the stability of SSR is affected by different wind velocities and capacitive compensation levels.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Detailed modelling and development of a laboratory prototype for the analysis of subsynchronous resonance in DFIG‐based wind farm

Mahalakshmi

Thampatty

2020

Int Trans Electr Energ Syst

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“…Different damping strategies to mitigate the SSR have been developed and can be generally divided into two types: (1) hardware‐based solutions, ie, auxiliary damping control schemes by using some FACTS devices and (2) software‐based solutions, ie, adding damping controller to grid side converter (GSC) or rotor side converter (RSC) of the DFIG system . Bongiorno et al proposed a damping method of the SSR using static synchronous series compensator.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the stability is not assured on a practical system. State feedback linearization‐based nonlinear controller for SSR mitigation is proposed in Li et al However, the SSR is not efficiently damped under low wind speed, and the damping controllers in both RSC and GSC increase the system complexity.…”

Section: Introductionmentioning

confidence: 99%

Active damping of resonances in DFIG system with cascade converter under weak grid

Din

Zhang

et al. 2019

Int Trans Electr Energ Syst

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Summary The interaction of impedance between the doubly fed induction generator (DFIG) system and series‐compensated weak grid gives rise to an issue of subsynchronous resonance (SSR). Likewise, the high‐frequency resonance (HFR) occurs when a DFIG system is connected to parallel‐compensated weak grid. This paper proposes an improved method to mitigate the caused resonance. The improved method, based on impedance modeling, utilizes an additional cascaded converter (CC) at Y‐point of DFIG stator winding with virtual impedance implemented at the CC control unit, which reshapes the DFIG impedance for effective mitigation of both SSR and HFR. The virtual impedance is disabled when DFIG operated in series‐compensated weak grid, while enabled when working in parallel‐compensated weak grid, which effectively damps the HFR. A detailed theoretical explanation and impedance modeling of the CC has been given. The effectiveness of the proposed method has been validated through MATLAB simulations based on a 2‐MW DFIG system.

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“…Through nonlinear state feedback and proper coordinate transformation, feedback linearization control (FLC) can eliminate the inherent nonlinearity of the system. 16,17 However, the conventional FLC is sensitive to parameter uncertainties, while operation conditions of DFIG wind farm is complex and changing. Sliding mode control (SMC) has been widely used due to its robustness and simplicity.…”

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confidence: 99%

Fractional‐order sliding mode control for damping of subsynchronous control interaction in DFIG‐based wind farms

Xiong

Wang

et al. 2019

Wind Energy

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This paper proposes a fractional-order sliding mode control (FOSMC) based on feedback linearization (FL) technique to mitigate subsynchronous control interaction (SSCI) in doubly fed induction generator (DFIG)-based wind farms connected to series-compensated transmission lines. A linearized form of the studied system is obtained with the use of FL, which leads to reduced system order and small computational burden. Then the FOSMC is designed for grid-side converter (GSC) to stabilize SSCI and to provide a considerable robustness against external disturbances and parameter uncertainties. For FOSMC parameter tuning, genetic algorithm (GA) is performed through MATLAB/SIMULINK. Time-domain simulation are carried out to evaluate the effectiveness of the FOSMC in mitigating SSCI at varied operating conditions, and the superior performance of the proposed control is demonstrated as compared with conventional vector control (VC), feedback linearization sliding mode control (FLSMC), high-order sliding mode control (HOSMC). KEYWORDS doubly fed induction generator, fractional-order sliding mode control, subsynchronous control interaction 1 | INTRODUCTION Subsynchronous resonance (SSR) of wind farms is a condition where wind turbines exchange energy with the grid at one or more natural frequency below the fundamental frequency. 1 A new type of SSR, known as subsynchronous control interaction (SSCI), has been detected worldwide in recent years. 2 Without the involvement of mechanical components, rapidly developing SSCI can lead to serious equipment damage and loss of power generation if proper countermeasures are not taken instantly. Furthermore, many studies have demonstrated that doubly fed induction generator (DFIG) wind farms are susceptible to SSCI due to the active participation of fast-acting converter control. 3,4 Therefore, it is urgent to develop effective SSCI mitigation techniques to ensure the safe operation of grid-connected DFIG-based wind farms.The design of SSCI damping controls has received much attention from industry and academia. A number of control methods using FACTS devices are proposed to mitigate SSCI, such as gate-controlled series capacitor (GCSC), 5 thyristor-controlled series capacitor (TCSC), 6 and static synchronous compensator (STATCOM). 7 As compared with FACTS-based damping controls, modification of wind turbine converter (WTC) control is an economical and convenient solution to SSCI. Since grid-side converter (GSC) has the damping capability similar to STATCOM with an extra advantage of lower cost, various damping methods are proposed based on the improvement of existing GSC control. A washout block is embedded into GSC stator voltage control for SSCI mitigation. 8 A supplemental damping signal is added to the summing junction of GSC's outer control. 9 GSC's d-axis inner control loop is also utilized to alleviate SSCI with speed deviation as input control signal (ICS). 10 GSC provides the greater flexibility of adding SSCI damping controls, but its damping capability is limited to 30% of...

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Nonlinear controller based on state feedback linearization for series-compensated DFIG-based wind power plants to mitigate sub-synchronous control interaction

Cited by 54 publications

References 43 publications

Detailed modelling and development of a laboratory prototype for the analysis of subsynchronous resonance in DFIG‐based wind farm

Detailed modelling and development of a laboratory prototype for the analysis of subsynchronous resonance in DFIG‐based wind farm

Active damping of resonances in DFIG system with cascade converter under weak grid

Fractional‐order sliding mode control for damping of subsynchronous control interaction in DFIG‐based wind farms

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