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|JEET, Vol. 13, No. 1, January 2018
| An Adaptive Complementary Sliding-mode Control Strategy of Single-phase Voltage Source Inverters
|| B - Electric Machinery and Power Electronics
||In order to achieve the high quality output voltage of single-phase voltage source
inverters, in this paper an Adaptive Complementary Sliding Mode Control (ACSMC) is proposed.
Firstly, the dynamics model of the single-phase inverter with lumped uncertainty including parameter
variations and external disturbances is derived. Then, the conventional Sliding Mode Control (SMC)
and Complementary Sliding Mode Control (CSMC) are introduced separately. However, when system
parameters vary or external disturbance occurs, the controlling performance such as tracking error,
response speed et al. always could not satisfy the requirements based on the SMC and CSMC methods.
Consequently, an ACSMC is developed. The ACSMC is composed of a CSMC term, a compensating
control term and a filter parameters estimator. The compensating control term is applied to compensate
for the system uncertainties, the filter parameters estimator is used for on-line LC parameter estimation
by the proposed adaptive law. The adaptive law is derived using the Lyapunov theorem to guarantee
the closed-loop stability. In order to decrease the control system cost, an inductor current estimator is
developed. Finally, the effectiveness of the proposed controller is validated through Matlab/Simulink
and experiments on a prototype single-phase inverter test bed with a TMS320LF28335 DSP. The
simulation and experimental results show that compared to the conventional SMC and CSMC, the
proposed ACSMC control strategy achieves more excellent performance such as fast transient
response, small steady-state error, and low total harmonic distortion no matter under load step change,
nonlinear load with inductor parameter variation or external disturbance.
||Adaptive complementary sliding-mode control,Single-phase voltage source inverter,Voltage control,Inductor current estimator