Power Factor of Thyristor-Controlled Loads with Sinusoidal Supply Voltage and Integral-Cycle Triggering
P. J. Gallagher, T.G. Bland, W. Shepherd · IEEE Transactions on Industrial Electronics and Control Instrumentation · 1977
A single-phase, thyristor-controlled resistive or series resistance-inductance load, with sinusoidal supply voltage, has a power factor that can be attributed to a combination of active, reactive (displacement) and distortion voltamperes.