Harmonic neutralized frequency changer
First Claim
1. A power converter system, comprising:
- a direct conversion frequency changer, implemented as an Unrestricted Frequency Changer or a Matrix Converter, including an input and an output, the frequency changer adapted to accept an input voltage at an input frequency at the input and deliver an output voltage at an output frequency at the output;
an input high bandwidth inverter;
an output high bandwidth inverter;
an inverter controller adapted to calculate harmonics at the input and output of the frequency changer and control the input and output high bandwidth inverters to generate input and output harmonic cancellation signals;
an input harmonic injection transformer connected to the input inverter and the input of the frequency changer to inject said input harmonic cancellation signals; and
an output harmonic injection transformer connected to the output inverter and the output of the frequency changer to inject said output harmonic cancellation signals.
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Accused Products
Abstract
A power converter that produces variable frequency multiphase AC power from fixed or variable frequency AC power. The converter can be used to drive an AC motor for propulsion applications or other motors and loads that require variable frequency AC power. The power converter system is based on a combination of several power conversion technologies used in a power circuit topology and a regulator control system that allows for higher electrical efficiency, higher power density and lower power distortion to be achieved than is possible from any of the individual technologies. Specifically, the input and output power distortion of a frequency changer is monitored, and a group of high performance inverters are used to inject harmonic currents into a specially designed transformer to neutralize the power distortion to a specified acceptable level. By this neutralization, the power density of a solid-state electric power converter is increased (e.g., by a factor of 5-6) and power quality distortion is reduced (e.g., below 0.1%). These features are especially useful in the electric power conversion markets particularly for surface ship and submarine propulsion drive applications.
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Citations
20 Claims
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1. A power converter system, comprising:
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a direct conversion frequency changer, implemented as an Unrestricted Frequency Changer or a Matrix Converter, including an input and an output, the frequency changer adapted to accept an input voltage at an input frequency at the input and deliver an output voltage at an output frequency at the output;
an input high bandwidth inverter;
an output high bandwidth inverter;
an inverter controller adapted to calculate harmonics at the input and output of the frequency changer and control the input and output high bandwidth inverters to generate input and output harmonic cancellation signals;
an input harmonic injection transformer connected to the input inverter and the input of the frequency changer to inject said input harmonic cancellation signals; and
an output harmonic injection transformer connected to the output inverter and the output of the frequency changer to inject said output harmonic cancellation signals. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A power converter system, comprising:
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a frequency changer with an input and an output, the frequency changer adapted to accept an input voltage at an input frequency at the input and deliver an output voltage at an output frequency at the output;
an input high bandwidth inverter;
an output high bandwidth inverter;
an inverter controller adapted to calculate harmonics at the input and output of the frequency changer and control the input and output high bandwidth inverters to generate input and output harmonic cancellation signals;
an input harmonic injection transformer connected to the input inverter and the input of the frequency changer to inject said input harmonic cancellation signals; and
an output harmonic injection transformer connected to the output inverter and the output of the frequency changer to inject said output harmonic cancellation signals, wherein said harmonics calculated by the inverter controller are input and output voltage harmonics. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A power converter system, comprising:
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a frequency changer with an input and an output, the frequency changer adapted to accept an input voltage at an input frequency at the input and deliver an output voltage at an output frequency at the output;
an input high bandwidth inverter;
an output high bandwidth inverter;
an inverter controller adapted to calculate harmonics at the input and output of the frequency changer and control the input and output high bandwidth inverters to generate input and output harmonic cancellation signals;
an input harmonic injection transformer connected to the input inverter and the input of the frequency changer to inject said input harmonic cancellation signals; and
an output harmonic injection transformer connected to the output inverter and the output of the frequency changer to inject said output harmonic cancellation signals, wherein said generated input and output harmonic cancellation signals are narrow band discrete harmonic cancellation signals. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification