Model Predictive Control of LC-Filtered Voltage Source Inverters With Optimal Switching Sequence

Voltage source inverters with output LC filter enable a sinusoidal output voltage with low harmonics, thus suitable for islanded ac microgrid or uninterruptible power supply applications. Conventional finite-set model predictive voltage control applies only a single switching vector per control period, leading to a variable switching frequency and significant output ripple. This paper resolves these issues by proposing an improved model predictive voltage control with optimal switching sequence (OSS-MPVC). First, an improved vector switching sequence is defined, aiming to reduce the output-voltage ripple with a constant switching frequency. Then, to tackle the difficulty in extending the OSS to high-order systems due to the coupling effect of the output filter, a generalized ‘one-step estimation’ solution is proposed, which directly associates the control-variable gradients with the vector switching sequence. To further enhance the output-voltage tracking accuracy, inter-sample dynamics are taken into account in the cost function. The control delay and dead-time compensation are also considered. Simulations and experimental results verify the feasibility of the proposed method.