<p>This paper proposes an integral-action sliding mode control (IA-SMC) strategy for the grid-side converter (GSC) of a doubly fed induction generator (DFIG)-based wind energy system. The studied system integrates the turbine, gearbox, DFIG, DC bus, a rotor-side converter (RSC) and a grid-side converter (GSC). The proposed controller addresses the nonlinear and coupled dynamics of the system, ensuring robust DC-link voltage regulation and accurate reactive power control while mitigating chattering effects. The performance of the IA-SMC is evaluated and compared with conventional PI and classic sliding mode control (SMC) under wind variations, grid-voltage disturbances, and DC-link capacitance changes. The results show that IA-SMC significantly outperforms both controllers. Compared to PI, the DC-link voltage overshoot is reduced by up to <InlineEquation ID="IEq1"> <EquationSource Format="TEX">$91\%$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>91</mn> <mo>%</mo> </mrow> </math></EquationSource> </InlineEquation> under wind disturbances and <InlineEquation ID="IEq2"> <EquationSource Format="TEX">$83\%$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>83</mn> <mo>%</mo> </mrow> </math></EquationSource> </InlineEquation> under grid-voltage variations, with a settling time reduction of about <InlineEquation ID="IEq3"> <EquationSource Format="TEX">$32\%$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>32</mn> <mo>%</mo> </mrow> </math></EquationSource> </InlineEquation> and a voltage drop reduction of <InlineEquation ID="IEq4"> <EquationSource Format="TEX">$66\%$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>66</mn> <mo>%</mo> </mrow> </math></EquationSource> </InlineEquation> during capacitance variations. Compared to the classic SMC, the overshoot is reduced by up to <InlineEquation ID="IEq5"> <EquationSource Format="TEX">$50\%$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>50</mn> <mo>%</mo> </mrow> </math></EquationSource> </InlineEquation> under wind disturbances and <InlineEquation ID="IEq6"> <EquationSource Format="TEX">$67\%$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>67</mn> <mo>%</mo> </mrow> </math></EquationSource> </InlineEquation> under grid-voltage variations, while the voltage drop is reduced by about <InlineEquation ID="IEq7"> <EquationSource Format="TEX">$50\%$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>50</mn> <mo>%</mo> </mrow> </math></EquationSource> </InlineEquation>. Moreover, IA-SMC reduces current overshoot by about <InlineEquation ID="IEq8"> <EquationSource Format="TEX">$69\%$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>69</mn> <mo>%</mo> </mrow> </math></EquationSource> </InlineEquation> and attenuates reactive power fluctuations by up to <InlineEquation ID="IEq9"> <EquationSource Format="TEX">$96\%$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>96</mn> <mo>%</mo> </mrow> </math></EquationSource> </InlineEquation> compared to PI and <InlineEquation ID="IEq10"> <EquationSource Format="TEX">$56\%$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>56</mn> <mo>%</mo> </mrow> </math></EquationSource> </InlineEquation> compared to SMC. These results confirm the effectiveness and robustness of the proposed approach.</p>

Improved Performance of a Grid-Connected DFIG Wind System Using Integral-Action Sliding Mode Control of the Grid-Side Converter

期刊论文
发表日期：

2026年8月3日

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Ahlem Bensmara,
Daoud Rezzak,
Nasserdine Boudjerda,
Ahsene Boubakir

摘要

This paper proposes an integral-action sliding mode control (IA-SMC) strategy for the grid-side converter (GSC) of a doubly fed induction generator (DFIG)-based wind energy system. The studied system integrates the turbine, gearbox, DFIG, DC bus, a rotor-side converter (RSC) and a grid-side converter (GSC). The proposed controller addresses the nonlinear and coupled dynamics of the system, ensuring robust DC-link voltage regulation and accurate reactive power control while mitigating chattering effects. The performance of the IA-SMC is evaluated and compared with conventional PI and classic sliding mode control (SMC) under wind variations, grid-voltage disturbances, and DC-link capacitance changes. The results show that IA-SMC significantly outperforms both controllers. Compared to PI, the DC-link voltage overshoot is reduced by up to $91\%$ $91 %$ under wind disturbances and $83\%$ $83 %$ under grid-voltage variations, with a settling time reduction of about $32\%$ $32 %$ and a voltage drop reduction of $66\%$ $66 %$ during capacitance variations. Compared to the classic SMC, the overshoot is reduced by up to $50\%$ $50 %$ under wind disturbances and $67\%$ $67 %$ under grid-voltage variations, while the voltage drop is reduced by about $50\%$ $50 %$ . Moreover, IA-SMC reduces current overshoot by about $69\%$ $69 %$ and attenuates reactive power fluctuations by up to $96\%$ $96 %$ compared to PI and $56\%$ $56 %$ compared to SMC. These results confirm the effectiveness and robustness of the proposed approach.