Control methods for pulse width modulation (pwm)

Details Control methods for pulse width modulation (pwm) Control methods for pulse width modulation (pwm)

H - Electricity

02

M

H02M 5/00 (2006.01) H02J 3/40 (2006.01) H02M 5/40 (2006.01) H02P 9/48 (2006.01) H02P 27/08 (2006.01)

Patent

CA 2599126

The present invention provides a method of controlling a power converter that can be used to interface to a power grid or supply network operating at a frequency (Fnet) that is nominally fixed (say at 50 Hz, for example) but which can be varied as a way of controlling power imbalanced within the network as a whole. The power converter can include a network bridge that operates in accordance with the pulse width modulation (PWM) strategy having a switching frequency (Fpwm), a nominal switching frequency (Fpwm_nom) and a number of pulses per period (Pulse_Number). The method comprising the step of varying the switching frequency (Fpwm) of the PWM strategy in accordance with the time-varying frequency (Fnet) of the supply network to achieve only integer odd harmonics of the time-varying frequency (Fnet) and adjusting the number of pulses per period (Pulse Number) in accordance with the time-varying frequency (Fnet) of the supply network to maintain a switching frequency (Fpwm) that is less than, or equal to, the nominal switching frequency (Fpwm_nom).

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