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US 11,539,214 B2Granted
Modular power conversion system
AssigneeDEKA Products Limited Partnership
InventorsDonald J. Lucas, Christopher L. Barber, Xiaorong Xia
Life of this patent
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Abstract
A method for determining when a connection of a power system to a grid has been disconnected. The method includes the power system supplying a first amount of reactive power to the grid to which the power system is connected, and the power system determining if there is a frequency change within the grid. This includes if the frequency change does not exceed a predetermined threshold, the power system supplying a second amount of reactive power to the grid, and if the frequency exceeds a predetermined threshold, the power system supplying a first amount of reactive power to the grid.
Claims16
A modular power conversion system comprising:
- at least one first electric resource comprising:
- an electric generator comprising a permanent magnetic synchronous motor;
- and
- a motor controller for the permanent magnetic synchronous motor comprising:
- an analog/digital converter that converts analog sensor signals from the permanent magnetic synchronous motor to digital signals for use by a digital signal processor comprising half bridges across a DC bus and an inductor-capacitor-inductor filter that produce three phase AC power at a predetermined voltage and frequency;
- at least one voltage sensor and at least one current sensor for three-phase demodulation of the three phase signals and converting the three-phase signals to a two-phase orthogonal reference frame;
- and
- a position/velocity estimator for providing a velocity of the permanent magnetic synchronous motor based on sensor signals from Hall sensors associated with the permanent magnetic synchronous motor including:
- estimating a position based on the sensor signals;
- comparing the estimated position to a measured position;
- and
- providing the desired velocity based on a choice between the estimated position or the measured position, the choice being based on a difference between the estimated position and the measured position;
- a modular power stage;
- and at least one second electric resource,
- wherein the modular power stage comprising at last one module including a power electronics system for converting power between the at least one first electronic resource and the at least one second electric resource;
- wherein measuring the position based on the sensor signals comprises:
- unwrapping the sensor signals by extending lowest significant bits of the sensor signals over time to obtain a measured position;
- estimating the position based on the sensor signals comprises:
- (a) estimating the position and the velocity based on the sensor signals;
- (b) computing a position error based on the difference between the estimated position and the measured position;
- (c) providing the estimated velocity as the desired velocity if the position error is greater than a pre-selected threshold;
- (d) modifying the estimated velocity based on the position error if the position error is less than or equal to a pre-selected threshold;
- (e) estimating the position by integrating the estimated velocity;
- (f) applying a deadband range based on the Hall sensors to the position error;
- and (g) returning to (b).
22 more elements
A modular power conversion system comprising:
- a permanent magnetic synchronous motor;
- and
- a motor controller for the permanent magnetic synchronous motor comprising:
- an analog/digital converter that converts analog sensor signals from the permanent magnetic synchronous motor to digital signals for use by a digital signal processor comprising half bridges across a DC bus and an inductor-capacitor-inductor filter that produce three phase AC power at a predetermined voltage and frequency;
- at least one voltage sensor and at least one current sensor for three-phase demodulation of the three phase signals and converting the three-phase signals to a two-phase orthogonal reference frame;
- and
- a position/velocity estimator for providing a velocity of the permanent magnetic synchronous motor based on sensor signals from Hall sensors associated with the permanent magnetic synchronous motor including:
- estimating a position based on the sensor signals;
- comparing the estimated position to a measured position;
- and providing the desired velocity based on a choice between the estimated position or the measured position, the choice being based on a difference between the estimated position and the measured position;
- wherein measuring the position based on the sensor signals comprises:
- unwrapping the sensor signals by extending lowest significant bits of the sensor signals over time to obtain a measured position;
- estimating the position based on the sensor signals comprises:
- (a) estimating the position and the velocity based on the sensor signals;
- (b) computing a position error based on the difference between the estimated position and the measured position;
- (c) providing the estimated velocity as the desired velocity if the position error is greater than a pre-selected threshold;
- (d) modifying the estimated velocity based on the position error if the position error is less than or equal to a pre-selected threshold;
- (e) estimating the position by integrating the estimated velocity;
- (f) applying a deadband range based on the Hall sensors to the position error;
- and (g) returning to (b).
17 more elements
Dependencies are inferred from the claim text.