Synchronous and bi-directional variable frequency power conversion systems
First Claim
1. A synchronous and bi-directional power conversion module for use in a variable frequency power conversion system, the power conversion module comprising:
- a digital controller that receives signals from AC and DC voltage and current sensors and generates gating signals to power switching devices to control power flow between an AC side and a DC side of the power switching devices, wherein the digital controller includes a digital phase lock loop (DPLL) that uses a feed-forward predictive system based on a look-up table to track the system variable frequency, which is a frequency of a variable frequency power source.
1 Assignment
0 Petitions
Accused Products
Abstract
A synchronous bi-directional active power conditioning system (11) suitable for wide variable frequency systems or active loads such as adjustable speed drives which require variable voltage variable frequency power management systems is disclosed. Common power electronics building blocks (100, 200) (both hardware and software modular blocks) are presented which can be used for AC-DC, DC-AC individually or cascaded together for AC-DC-AC power conversion suitable for variable voltage and/or wide variable frequency power management systems. A common control software building block (2, 5) includes a digital control strategy/algorithm and digital phase lock loop method and apparatus which are developed and implemented in a digital environment to provide gating patterns for the switching elements (3, 6) of the common power-pass modular power electronics building blocks (100, 200).
292 Citations
30 Claims
-
1. A synchronous and bi-directional power conversion module for use in a variable frequency power conversion system, the power conversion module comprising:
a digital controller that receives signals from AC and DC voltage and current sensors and generates gating signals to power switching devices to control power flow between an AC side and a DC side of the power switching devices, wherein the digital controller includes a digital phase lock loop (DPLL) that uses a feed-forward predictive system based on a look-up table to track the system variable frequency, which is a frequency of a variable frequency power source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
11. A digital phase lock loop (DPLL) for variable frequency power conversion systems comprising:
-
an input section that determines a reference phase angle error signal based on a reference phase angle of a variable frequency input and an estimated phase angle;
a PI controller that determines a measured frequency of the variable frequency input based on the phase angle error signal; and
a look-up table that, using the measured frequency, determines a phase angle step, a sampling frequency, and a phase angle delay, wherein the estimated phase angle is generated by a discrete integrator using the phase angle step and a prior value of the estimated phase angle, and a compensated phase angle is generated using the estimated phase angle and the phase angle delay. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
-
-
21. A method for implementing a digital phase lock loop (DPLL) for variable frequency power conversion systems, the method comprising:
-
determining a reference phase angle error signal based on a reference phase angle of a variable frequency input and an estimated phase angle;
determining a measured frequency of the variable frequency input based on the phase angle error signal; and
using the measured frequency as an input to a look-up table that generates a phase angle step, a sampling frequency, and a phase angle delay, wherein the estimated phase angle is generated by a discrete integrator using the phase angle step and a prior value of the estimated phase angle, and a compensated phase angle is generated using the estimated phase angle and the phase angle delay. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
-
Specification