Predictive Control of Four-Leg Converters for Photovoltaic Energy Systems
Photovoltaic energy systems are one of the most widely adopted distributed generation facilities. This book chapter presents predictive based current and voltage control strategies for four-leg converters employed in grid-connected and standalone photovoltaic energy systems, respectively. The proposed approach employs the novel stationary frame sampled-data models of the four-leg converters with inductive (L) and inductive-capacitive (LC) filters on the output side to predict the control variables such as output currents and load voltages. These predictions are performed using all the possible switching states of four-leg converters. The objective of minimizing the error between reference and predicted variables (load currents or voltages) is fulfilled through a cost function in the predictive control schemes. In addition, the voltage balancing of DC-bus capacitors is considered with the four-leg neutral-point clamped converters. The optimal switching states corresponding to the minimal cost function value are chosen and directly applied to the converter. The predictive control strategies fulfil the control requirements such as load current/voltage control, DC-bus voltage balancing, and neutral-leg switching frequency minimization. The simulation and experimental studies conducted using unbalanced and nonlinear loads to validate the proposed predictive control strategies.
- 1.International Energy Agency. Snapshot of global photovoltaic markets. Technical report, 2018. Rep. IEA PVPS T1-33:2018Google Scholar
- 14.Yaramasu V, Wu B (2016) Model predictive control of wind energy conversion systems, 1st edn. Wiley-IEEE Press, HobokenGoogle Scholar
- 20.Yaramasu V, Rivera M, Wu B, Rodriguez J (2015) Predictive control of four-leg power converters. pp 121–125Google Scholar
- 21.Yaramasu V, Wu B, Rivera M, Rodriguez J (2013) Predictive current control and DC-link capacitor voltages balancing for four-leg NPC inverters. In: IEEE international symposium on industrial electronics (ISIE), Taipei, Taiwan. pp 1–6Google Scholar