Virtual variable sampling repetitive control of single-phase DC/AC PWM converters
2018
Repetitive control (RC) presents an attractive
solution to achieve low steady-state tracking error and total
harmonic distortion (THD) for periodic signals. For conventional
RC (CRC), it requires that the ratio of reference
signal period to the fixed sampling period to be an integer.
Therefore, the reference signal with variable frequency or
a fractional period ratio will lead to severe performance
degradation. Although existing hardware variable sampling
rate methods enable CRC to be frequency adaptive, the
variable sampling frequency will also influence the overall
system stability, and they need that the CPU has variable
sampling frequency ability. In this paper, a flexible and
easy-to-implement method, virtual variable sampling (VVS),
is proposed to enable RC to be frequency adaptive. The
proposed VVS method, which creates a virtual delay unit
to approximate each variable sampling delay, achieves a
flexible variable sampling as similar as hardware-based
variable sampling, but it does not influence overall system
sampling frequency and stability. Experimental results of
a single phase DC/AC converter system are presented to
show the effectiveness of the proposed VVS-RC.
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