Control Techniques of Grid Connected PWM Rectifiers under Unbalanced Input Voltage Conditions
Abstract
Current-controlled voltage sourceconverters are widely used in grid-connected applications,
for example for ac drives with indirect frequency
converters. The structure and parameters of the PLL are
developed and proposed in order to cope with the grid
containing both the positive and the negative sequence
components, and minimize the wrong frequency transients
during phase angle steps and also in the start-up stage. The
DSC (Delayed Signal Cancellation) technique was realised.
There is also necessary to compensate the negative sequence
component in the grid voltage. The negative sequence
component of the grid voltage causes ripples of the dc
voltage in the DC link. Several sophisticated topologies of
converter current controller were developed, simulated and
tested for this purpose. Results of simulation and
experimental tests are provided to evaluate different current
control schemas and phase locked loop techniques.
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