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US 7,733,677 B2Granted
Output power switching vector scaling system and method
AssigneeHoneywell International Inc.
InventorLouis Cheng
Life of this patent
Estimating the term…
Abstract
A power converter control system and method is provided to maximize the power output of the converter where an overload condition is present. A controller calculates a command voltage and command power factor. The command voltage and command power factor are used to generate a switching vector. Where the voltage associated with a switching vector exceeds an output voltage limit of the converter, a power factor adjustment is generated.
Claims16
A converter control system comprising:
- a current magnitude determination module connected to receive an output current value and a desired output voltage value and provide a current magnitude signal;
- a power factor correction module connected to receive the current magnitude signal and a phase angle adjustment value and to produce a current phase signal;
- and
- a power factor adjustment module comprising;
- a conversion module for converting the desired output voltage value to a maximum phase voltage value;
- a first squaring module connected to receive a value of a first component (Vtd) of a switching vector and square said value;
- a second squaring module connected to receive a value of a second component (Vtq) of the switching vector and square said value;
- an adder to sum squared values from the first and second squaring modules;
- a square root module for generating a root value of summed square values from the adder;
- an addition module to sum the maximum phase voltage value and the root value to produce a difference value;
- an integrator to process the difference value and to generate a phase angle adjustment value for feedback to the power factor control module;
- and
- wherein the power factor is adjusted responsively to a condition in which a desired terminal voltage magnitude exceeds a voltage limit of the converter capability.
10 more elements
A power converter comprising:
- a converter receiving power from an AC power source and generating a regulated DC voltage;
- and
- a control module providing control signals to the converter, the control module comprising;
- a power factor correction module which comprises;
- a proportional integrator controller for producing a reference power factor;
- a high pass filter for extracting a high-frequency component of desired output current value and producing a high frequency component value;
- a gain controller for receiving the high frequency component value and producing a scaled fine-tune component;
- and
- an addition module for summing an angle adjustment factor and the scaled fine-tune component to produce a phase angle vector;
- and
- wherein the control module provides control signals to the converter to change a power factor of the regulated DC voltage when the converter experiences an overload condition.
8 more elements
A method of controlling a power converter comprising:
- receiving an output voltage;
- receiving an output current;
- calculating a command current;
- calculating a command power factor;
- generating a switching vector;
- determining if the switching vector creates an overload condition;
- calculating an angle adjustment when there is an overload condition;
- calculating a second command power factor using the angle adjustment;
- and
- wherein the step of calculating an angle adjustment comprises;
- converting a desired output voltage value to a maximum phase voltage value;
- squaring a value of a first component (Vtd) of a switching vector;
- squaring a value of a second component (Vtq) of the switching vector;
- summing the squared values;
- generating a root value of the summed square values;
- summing a maximum phase voltage value and the root value to produce a difference value;
- and
- processing the difference value to generate a phase angle adjustment value for feedback to a power factor control module so that the step of calculating the second command power factor may be performed.
15 more elements
Dependencies are inferred from the claim text.