Abstract
Min-projection switching law, a related control method of switched linear systems model, is famous for its outstanding dynamic performance. However, under digital control framework, H6 inverter directly employing it performs unsatisfactorily. To improve the performance, a new control law based on projection-value-based switching strategy named synthetic velocity vectors control law (SVVCL) is proposed in this paper. Compared with min-projection switching law, SVVCL could be effectively applied on digital-controlled H6 inverter under the framework of pulse width modulation (PWM) technique. Firstly, fitness function of SVVCL considering static and dynamic performances is established. Secondly, control law is simplified to improve its accessibility. Further, a common approach to design compensator for improving output robustness is discussed. Finally, experiments on a 400W prototype are carried out. Results show that H6 inverter employing SVVCL has preferable static performance, strong robustness, as well as excellent dynamic response characteristics.
Highlights
EXPERIMENT RESULTS AND ANALYSIS The prototype with synthetic velocity vectors control law (SVVCL), direct control method, and zeros-poles placement method, applying the circuit parameters in Table 2, components in Table 3 and the control system parameters mentioned in section IV, are performed
The results prove the splendid dynamic performance of inverter employed SVVCL
To improve performance of inverter applying projectionvalue-based switching strategy on digital control framework, a method based on synthetic velocity vectors has been proposed
Summary
H6 topology attracts increasing attention and has been used in transformerless photovoltaic (PV) grid-tied inverter, for its remarkable properties of very low common mode leakage. A direct approach to apply the control law based on projection-value-based switching strategy on digital control framework, is periodically checking whether switching conditions are satisfied. This approach utilizes PWM technique to fasten switching frequency, utilizes the low-pass characteristic of PWM technique to improve anti-interference ability In this case, SLS model had been successfully employed on three-phase converter under space vector pulse width modulation (SVPWM), by computing appropriate pulse width within each period, in [9] and [47]. SLS model had been successfully employed on three-phase converter under space vector pulse width modulation (SVPWM), by computing appropriate pulse width within each period, in [9] and [47] Inspired by those references, a control method with similar characteristics is proposed in this paper. With global stable fields x∗, various switching law can be proposed in algebraic form
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