Inverter for a distributed power generator

摘要

Provided is a maximum power point (MPP) tracker for a PV cell inverter, and a PV cell inverter. The MPP tracker decouples output power oscillations from the input power generation and extracts maximum available power from the PV cell. The PV cell inverter uses the MPP tracker and generates a sinusoidal output current from the MPP tracker output. The sinusoidal output current may be fed to a power distribution grid. The PV cell inverter may use a pulse width modulation technique to cancel harmonics in the sinusoidal output current. The circuits use a minimum number of components and avoid use of large electrolytic capacitors.

主权项

1. A compensator, comprising:
an input that receives a signal corresponding to a voltage source inverter input voltage or a current source inverter input current and generates a compensation signal representing a deviation of the voltage source inverter input voltage or the current source inverter input current from a DC value; an input that receives a pulse width modulation reference signal and modifies the pulse width modulation reference signal according to the compensation signal, and produce a modified pulse width modulation reference signal; and an output that provides the modified pulse width modulation reference signal to a pulse width modulator; wherein the modified pulse width modulation reference signal controls the pulse width modulator such that a harmonic in a voltage source inverter output current or a current source inverter output current is substantially reduced; wherein the harmonic arises from voltage source inverter input voltage oscillation or current source inverter input current oscillation.