Harmonic compensator using low leakage reactance transformer

Abstract

Abstract A harmonic compensator comprises a transformer having low leakage reactance connected between a utility and a load and a signal generator which injects into the transformer a signal having a frequency which cancels undesirable higher order harmonics induced by the load. The low leakage reactance nature of the transformer permits injection of high frequency signals which restore the fundamental sine wave of the signal from the utility and thereby eliminates undesirable nonlinear harmonics which cause up-line disruptions. The low leakage reactance transformers may comprise a coaxial structure having a thin hollow tube as the primary coil, a coaxial structure having a single main coaxial cable distributed into several paralleled coaxial cables of smaller diameter, or a co-planar transformer structure having flat strip line conductors wrapped around a conventional core as the primary and secondary coils. Injection of a high frequency signal from the signal generator into the low leakage reactance transformer does not generate unacceptably large voltage drops as in conventional transformers because leakage reactance is low. Thus, the signal compensator is able to produce a signal of sufficiently high dynamic response to match that of even the fastest changing portions of the undesired harmonic signal travelling toward the utility from the load.

Inventors

• 👤 Gary Skibinski

Bibliographic Details