Abstract: A system for synchronizing an electrical generator to a reference power source, the system comprising: a first measurement unit configured to: measure a magnitude and a frequency of a first electrical power at a terminal of the reference power source; record first timing data indicative of the occurrence of predetermined variations of the first electrical power at the terminal of the reference power source; and transmit the first timing data and first measurement data comprising the measured magnitude and the measured frequency of the first electrical power; a second measurement unit configured to: receive the first measurement data; measure a magnitude and a frequency of a second electrical power at a terminal of the electrical generator; and record second timing data indicative of a present time; and a controller configured to adjust operational characteristics of the electrical generator based on the first timing data, the second timing data, the first measurement data, and second measurement data comprisi

Abstract: A drive circuit for a three-plane load (7) includes an inverter bridge consisting of six bridge switches (T1 to T6), a modulation generator (6) which controls switching of the inverter bridge (4) via a pulse width modulator, in dependence on the inverter line voltage commands (Va, Vb and Vc) and sensed line currents (Ia, Ib and Ic). The pulse width modulation generator is configured such that if the commanded line voltages allow, the phase leg carrying the greater sensed, current is claimed to one of the d.c. rails, the required line voltage controlled by varying the on-to-off duty cycle of the two other bridge legs in accordance with the pulse width modulation (pwm) principle. Clamping suppresses the high frequency switching in the leg (dead-banding) and in the steady state occurs for two sixty-degree segments of the fundamental cycle. The reduction in switching losses associated with the clamping is maximized by linking the dead-band to the peaks of the leg current.