High penetration of power converters may lead to power ripple, voltage swings, and weak antidisturbances for microgrids. Confronting these issues, this work proposes a robust control scheme, discrete-time super-twisting observer (DSTO)-embedded quasi-integral sliding-mode control (QISMC), for a three-level neutral-point-clamped power converter system, dramatically enhancing power/voltage regulation performance and antidisturbance capability. A fast convergence DSTO is deployed to offset multidisturbances caused by parameter mismatches, unknown loads, current path changes, switch mode noise, and self-compensating power/voltage tracking biases in QISMC. To further mitigate power/voltage steady-state error and boost system robustness, a new quasi-integral sliding-mode surface is built, inherently improving power/voltage tracking performance. Experimental data confirm that the proposed control outperforms the discrete-time extended-state-observer-based QISMC, DSTO-based quasi-sliding mode control, and discrete-time proportional–integral control in power/voltage, grid current harmonics, and robustness.     «

High penetration of power converters may lead to power ripple, voltage swings, and weak antidisturbances for microgrids. Confronting these issues, this work proposes a robust control scheme, discrete-time super-twisting observer (DSTO)-embedded quasi-integral sliding-mode control (QISMC), for a three-level neutral-point-clamped power converter system, dramatically enhancing power/voltage regulation performance and antidisturbance capability. A fast convergence DSTO is deployed to offset multidis...     »

Funding Agency: 10.13039/501100001809-National Natural Science Foundation of China (Grant Number: 52277191, 52277192 and 62303134) 10.13039/501100002858-China Postdoctoral Science Foundation (Grant Number: 2022M710963) 10.13039/501100005046-Natural Science Foundation of Heilongjiang Province (Grant Number: YQ2022F008) Heilongjiang Postdoctoral Science Foundation (Grant Number: LBH-Z22160) 10.13039/501100004837-Ministerio de Ciencia e Innovación (Grant Number: PID2020-115561RB-C31) MCIN/AEI/10.13039/501100011033 (Grant Number: TED2021-130613B-I00) 10.13039/501100000780-European Commission     «

Funding Agency: 10.13039/501100001809-National Natural Science Foundation of China (Grant Number: 52277191, 52277192 and 62303134) 10.13039/501100002858-China Postdoctoral Science Foundation (Grant Number: 2022M710963) 10.13039/501100005046-Natural Science Foundation of Heilongjiang Province (Grant Number: YQ2022F008) Heilongjiang Postdoctoral Science Foundation (Grant Number: LBH-Z22160) 10.13039/501100004837-Ministerio de Ciencia e Innovación (Grant Number: PID2020-115561RB-C31) MCIN/AEI...     »