Model-Based Control Design of Series Resonant Converter Based on the Discrete Time Domain Modelling Approach for DC Wind Turbine

Abstract

This paper focuses on the modelling of the series resonant converter proposed as a DC/DC converter for DC wind turbines. The closed-loop control design based on the discrete time domain modelling technique for the converter (named SRC#) operated in continuous-conduction mode (CCM) is investigated. To facilitate dynamic analysis and design of control structure, the design process includes derivation of linearized state-space equations, design of closed-loop control structure, and design of gain scheduling controller. The analytical results of system are verified in z-domain by comparison of circuit simulator response (in PLECS™) to changes in pulse frequency and disturbances in input and output voltages and show a good agreement. Furthermore, the test results also give enough supporting arguments to proposed control design.

Discrete-Time Domain Modeling of a High-Power Medium-Voltage Resonant Converter

“…Sub-resonant mode occurs when the switching frequency (f s ) is less than the natural frequency (f r ) obtained from the resonant tank parameters. Hence, should the converter operate in sub-resonant mode, the mean output power becomes a function of the number of current pulses transmitted to the load [12]. The switch pairs (S 1 , S 4 ) and (S 2 , S 3 ) in Fig.…”

“…The concept behind this method is calculating state variables at the beginning of each switching cycle. This idea was later developed and employed for a pulse-removal-technique-driven SRC [12]. But neither the model's dynamic behavior is thoroughly analyzed, nor is the control input chosen according to the obtained transfer function.…”

Harmonic Susceptibility Study of DC Collection Network Based on Frequency Scan and Discrete Time-Domain Modelling Approach

“…Steps 6 and 7 establish the space model of the plant. Finally, the converter plant mode is established based on the discrete time-domain modelling approach proposed in (Step 8) [42,46]. Step 9 gives a set of interesting transfer function of the output LC filter.…”

Validation of a Discrete-Time-Domain Model of a High-Power Medium-Voltage Resonant Converter*

“…In this method, the state variables are computed at the commencement of each switching cycle. The discrete-time domain modeling concept later is used by [12] to derive the mathematical model of a pulse-removal-technique-based Series Resonant Converter (SRC). But, neither is the dynamic model of SRC investigated nor is it used to design a controller.…”