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.
Highlights
MEDIUM-voltage DC (MVDC) collection of wind power is an attractive candidate to reduce overall losses and installation cost, especially within offshore HVDC-connected wind generation as illustrated in Figure 1 [1]
To verify the control design, first the circuit simulation is carried out with circuit simulation tool of PLECS6, and the controller is implemented in a scaled-down laboratory test bench
A model-based control design of series resonant converter (SRC)# for DC wind power plant based on small-signal plant model in the discrete timedomain modelling is revealed
Summary
MEDIUM-voltage DC (MVDC) collection of wind power is an attractive candidate to reduce overall losses and installation cost, especially within offshore HVDC-connected wind generation as illustrated in Figure 1 [1]. Traditional closed-loop control of SRC for the DC distribution system is implemented by detecting the zerocrossing of the resonant inductor current i푟 and controlling the length of transistor and diode conduction angle α without considering circuit parameters of SRC [7]. The output power flow control of SRC for DC network is achieved by controlling the phase-shift angle and frequency between the two arms of H-bridge inverter [6, 8, 9].
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